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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Jan. 31, 2016	Mar. 31, 2016	Jul. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Trading Symbol	OOMA
Entity Registrant Name	Ooma Inc
Entity Central Index Key	0001327688
Current Fiscal Year End Date	--01-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		17,174,133
Entity Public Float			$ 88,377,243

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 27,413	$ 9,133
Short-term investments	27,991
Accounts receivable, net	5,609	4,394
Inventories	5,011	8,081
Deferred inventory costs	2,013	2,248
Prepaid expenses and other current assets	1,318	945
Total current assets	69,355	24,801
Property and equipment, net	4,291	2,893
Intangible assets, net	885	1,278
Goodwill	1,117	1,117
Other assets	888	1,188
Total assets	76,536	31,277
Current liabilities:
Accounts payable	4,786	3,967
Accrued expenses	13,010	10,313
Short-term capital lease and debt	632	1,562
Convertible preferred stock warrant liability		474
Deferred revenue	15,036	14,348
Total current liabilities	33,464	30,664
Long-term debt		10,398
Convertible preferred stock warrant liability - noncurrent		743
Other long-term liabilities	182	980
Total liabilities	33,646	42,785
Commitments and contingencies (Note 14)
Stockholders’ equity (deficit):
Preferred stock
Common stock	2
Additional paid-in capital	107,679	5,611
Accumulated other comprehensive income	17
Accumulated deficit	(64,808)	(50,756)
Total stockholders’ equity (deficit)	42,890	(45,145)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 76,536	31,277
Convertible Preferred Stock
Stockholders’ equity (deficit):
Preferred stock		$ 33,637

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jan. 31, 2016	Jan. 31, 2015
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	13,000,000
Common stock, shares issued	16,916,250	2,515,065
Common stock, shares outstanding	16,916,250	2,515,065
Convertible Preferred Stock
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	0	8,708,333
Preferred stock, shares issued	0	8,353,748
Preferred stock, shares outstanding	0	8,353,748

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Revenue:
Subscription and services	$ 73,064	$ 53,828	$ 35,377
Product and other	15,711	18,373	18,288
Total revenue	88,775	72,201	53,665
Cost of revenue:
Subscription and services	25,715	18,284	15,894
Product and other	16,150	18,440	15,573
Total cost of revenue	41,865	36,724	31,467
Gross profit	46,910	35,477	22,198
Operating expenses:
Sales and marketing	28,534	22,276	13,192
Research and development	18,502	12,290	7,888
General and administrative	12,561	6,650	2,573
Total operating expenses	59,597	41,216	23,653
Loss from operations	(12,687)	(5,739)	(1,455)
Other expense:
Interest expense, net	(881)	(323)	(269)
Change in fair value of warrants	(442)	(795)	(250)
Other expense	(42)	(55)	(26)
Loss before income taxes	(14,052)	(6,912)	(2,000)
Income tax benefit		502
Net loss	$ (14,052)	$ (6,410)	$ (2,000)
Net loss per share of common stock:
Basic and diluted	$ (1.38)	$ (2.81)	$ (1.18)
Weighted-average number of shares used in per share amounts:
Basic and diluted	10,173,095	2,284,241	1,688,846

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net Loss	$ (14,052)	$ (6,410)	$ (2,000)
Other comprehensive income, net of tax
Unrealized gain on short-term investment	17
Comprehensive loss	$ (14,035)	$ (6,410)	$ (2,000)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Series Alpha Convertible Preferred Stock	Series Alpha-1 Convertible Preferred Stock	Series Beta Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
BALANCE at Jan. 31, 2013	$ (37,962)	$ 30,536	$ 3,005			$ 4,384		$ (42,346)
BALANCE, Shares at Jan. 31, 2013		7,848,198	485,143		1,482,122
Issuance of common stock for stock option exercises	6					6
Issuance of common stock for stock option exercises, Shares					54,228
Vesting of early exercised stock options and restricted stock	25					25
Vesting of early exercised stock options and restricted stock, Shares					390,827
Stock-based compensation	72					72
Net Loss	(2,000)							(2,000)
BALANCE at Jan. 31, 2014	(39,859)	$ 30,536	$ 3,005			4,487		(44,346)
BALANCE, Shares at Jan. 31, 2014		7,848,198	485,143		1,927,177
Issuance of common stock for stock option exercises	19					19
Issuance of common stock for stock option exercises, Shares					135,564
Issuance of stock upon warrant exercise	11	$ 96				11
Issuance of stock upon warrant exercise, Shares		20,407			2,326
Issuance of common stock in conjunction with acquisition	338					338
Issuance of common stock in conjunction with acquisition, Shares					90,246
Vesting of early exercised stock options and restricted stock	68					68
Vesting of early exercised stock options and restricted stock, Shares					359,752
Issuance of common stock warrants in conjunction with debt	262					262
Stock-based compensation	426					426
Net Loss	(6,410)							(6,410)
BALANCE at Jan. 31, 2015	$ (45,145)	$ 30,632	$ 3,005			5,611		(50,756)
BALANCE, Shares at Jan. 31, 2015	67,884	7,868,605	485,143		2,515,065
Conversion of convertible preferred stock to common stock upon initial public offering	$ 38,637	$ (30,632)	$ (3,005)	$ (5,000)	$ 1	38,636
Conversion of convertible preferred stock to common stock upon initial public offering, Shares		(7,868,605)	(485,143)	(241,469)	8,878,857
Issuance of stock, value	56,879				$ 1	56,878
Issuance of stock, shares					5,000,000
Issuance of common stock for stock option exercises	$ 66					66
Issuance of common stock for stock option exercises, Shares	83,229				83,157
De-recognition of preferred warrant liability to additional paid-in capital	$ 1,075					1,075
Issuance of common stock in conjunction with acquisition	451					451
Issuance of common stock in conjunction with acquisition, Shares					49,159
Vesting of early exercised stock options and restricted stock	154					154
Vesting of early exercised stock options and restricted stock, Shares					327,349
Issuance of common stock related to employee stock purchase plan	111					111
Issuance of common stock related to employee stock purchase plan, Shares					15,569
Exercise of common stock warrants to common stock	31					31
Exercise of common stock warrants to common stock, Shares					30,573
Exercise of preferred stock warrants to common stock	13					13
Exercise of preferred stock warrants to common stock, Shares					16,521
Stock-based compensation	4,653					4,653
Other comprehensive income	17						$ 17
Net Loss	(14,052)							(14,052)
BALANCE at Jan. 31, 2016	$ 42,890				$ 2	$ 107,679	$ 17	$ (64,808)
BALANCE, Shares at Jan. 31, 2016	70,199				16,916,250

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Cash flows from operating activities:
Net loss	$ (14,052)	$ (6,410)	$ (2,000)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Stock-based compensation expense	4,653	426	72
Depreciation and amortization	1,410	896	787
Amortization of intangible assets	393	306	151
Deferred income taxes		(502)
Non-cash interest expense	64	57	65
Write-off of non-cash deferred debt issuance costs	332
Loss on disposal of equipment			47
Change in fair value of acquisition related contingent consideration	(281)	656
Change in fair value of warrant liability	442	795	250
Changes in operating assets and liabilities:
Accounts receivable, net	(1,215)	(2,095)	(597)
Inventories	3,070	(3,206)	(991)
Deferred inventory costs	235	(751)	(156)
Prepaid expenses and other assets	(470)	331	(150)
Accounts payable and accrued expenses	4,392	1,212	2,851
Other long term liabilities	(132)	204	19
Deferred revenue	689	4,014	1,874
Net cash (used in) provided by operating activities	(470)	(4,067)	2,222
Cash flows from investing activities:
Purchases of short-term investments	(28,078)
Purchases of property and equipment	(2,884)	(1,186)	(763)
Business acquisition, net of cash assumed		(672)
Purchases of software license, patents and intangibles			(135)
Net cash used in investing activities	(30,962)	(1,858)	(898)
Cash flows from financing activities:
Proceeds from initial public offering, net	57,021	(142)
Repayment of debt and capital leases	(11,620)	(1,508)	(1,365)
Proceeds from issuance of debt		9,921
Payment of acquisition related earn-out	(326)
Proceeds from issuance of common stock related to warrants and employee stock benefit plans	221	423	101
Payment of preferred warrant liability	(584)
Net cash provided by (used in) financing activities	49,712	8,694	(1,264)
Net increase in cash and cash equivalents	18,280	2,769	60
Cash and cash equivalents at beginning of period	9,133	6,364	6,304
Cash and cash equivalents at end of period	27,413	9,133	6,364
Supplemental disclosure of cash flow information
Income taxes paid	2	1	1
Interest paid	573	173	205
Non-cash investing and financing activities:
Conversion of preferred stock to common stock	38,637
Unpaid offering costs		351
De-recognition of warrant liability to additional paid-in capital	1,075
Issuance of warrants in connection with long-term debt		323
Shares issued as consideration in business acquisition and related earn-out	451	338
Purchase of equipment acquired on capital lease		1,321
Unpaid portion of property and equipment purchases	78	$ 162	$ 152
Series Beta Preferred Stock
Cash flows from financing activities:
Proceeds from Series Beta preferred stock, net	$ 5,000

Description of Business	12 Months Ended
Description of Business	Jan. 31, 2016
Accounting Policies [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS Description of Business—Ooma, Inc. (the “Company”) is a leading provider of innovative communications solutions and other connected services to small business, home, and mobile users. The Company’s unique hybrid Software-as-a-Service (“SaaS”) platform, consisting of its proprietary cloud, on-premises appliances, mobile applications, and end-point devices, provides the connectivity and functionality that enables solutions. The Company was incorporated in Delaware on November 19, 2003 and is headquartered in Palo Alto, California.

Summary of Significant Accounting Policies

12 Months Ended

Jan. 31, 2016

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation—The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and includes the accounts of the Company and its wholly owned subsidiary. All intercompany transactions and balances have been eliminated in consolidation.

Fiscal Year End—The last day of Company’s fiscal year is January 31, fiscal year end January 31, 2016 is referred as fiscal 2016, fiscal year end January 31, 2015 is referred as fiscal 2015 and fiscal year end January 31, 2014 is referred as fiscal 2014.

Use of Estimates—The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates include, but are not limited to, those related to revenue recognition, the allowance for returns, stock-based compensation and warrants, valuation of goodwill and intangible assets, inventory valuation, regulatory fees and indirect tax accruals, and accounting for income taxes, including valuation allowances and fair value measurements. Estimates are based on historical experience, where applicable, and other assumptions believed to be reasonable by management. Actual results could differ from those estimates.

Reverse Stock Split—Effective July 6, 2015, the Company completed a one-for-two reverse stock split, as approved by its Board of Directors (the “Board”). All shares and warrants and per share and warrant amounts set forth herein give effect to this reverse stock split.

Initial Public Offering and Conversion of Preferred Stock

In July 2015, the Company completed its initial public offering (the “IPO”). As a result, the following transactions were recorded in the Company’s consolidated financial statements as of January 31, 2016:

The Company issued 5,000,000 shares of its common stock at the initial public offering price of $13.00 per share. The net proceeds from the sale of the shares was $56.9 million after deducting the underwriters’ discounts and commissions of $4.5 million and $3.6 million of offering expenses.

8,353,748 shares of Series Alpha convertible preferred stock and Series Alpha-1 convertible preferred stock were collectively converted into 8,353,748 shares of common stock on a 1:1 basis. The public offering price of $13.00 per share triggered an automatic conversion of 241,469 shares of Series Beta convertible preferred stock, which automatically converted to 525,109 shares of common stock based on an adjusted conversion price equal to 75% of the $13.00 public offering price, or $9.75, rather than the $21.2028 per share consideration paid, pursuant to the conversion price adjustment provision applicable to such shares in the Company’s then-current amended and restated certificate of incorporation.

The warrant issued in December 2010 to purchase 70,287 shares of Series Alpha convertible preferred stock was cash settled at the IPO price of $13.00 per share after deducting the exercise price of $4.70 per share. The Company paid $0.6 million to the warrant holder on settlement.

Of the warrants to purchase 34,397 shares of Series Alpha convertible preferred stock issued in June 2009, warrants to purchase 2,769 shares of Series Alpha convertible preferred stock were cash exercised at an exercise price of $4.70 per share and resulted in 2,769 shares of common stock; warrants to purchase 21,529 shares of Series Alpha convertible preferred stock were net exercised using the IPO price of $13.00 per share net of the exercise price of $4.70 per share resulting in issuance of 13,752 shares of common stock; and warrants to purchase 10,099 shares of common stock were terminated due to failure to exercise on or before the IPO date per the terms of the warrant agreements.

On the completion of the IPO, the warrants to purchase 21,299 shares of Series Alpha convertible preferred stock issued in May 2009 and warrants to purchase 66,026 shares of Series Alpha convertible preferred stock issued in conjunction with the Company’s debt in April and December 2012 and October 2014 were converted on a 1:1 basis into warrants to purchase shares of common stock.

Of the warrants to purchase 87,828 shares of common stock outstanding prior to the IPO, 6,542 common warrants were cash exercised and converted to 6,542 shares of common stock and 4,100 common warrants were exercised net of the respective exercise price per warrant to 2,612 shares of common stock and 556 common warrants were terminated due to non-exercise on IPO per the terms of the warrant agreement.

Revenue Recognition—The Company derives revenue from two sources: (1) subscription and services revenue, which are generated from the sale of subscription plans and other services; and (2) product and other revenue. Products and services are sold directly to end-customers via the Company’s website and through distributors and retailers.

The Company recognizes revenue when the following criteria are met:

Persuasive evidence of an arrangement exists.

Delivery has occurred.

Collection of the fees is reasonably assured.

The fee is fixed or determinable.

Subscription and Services Revenue

The Company generates subscription and services revenue by selling subscriptions for communications solutions, as well as other connected services. Subscription revenue is derived primarily from recurring monthly and annual payments related to service plans such as Ooma Basic, Ooma Office and Premier, international calling plans, and other subscriptions. Subscription revenue is recognized on a straight-line basis over the contractual service term. Subscription and services revenue also includes revenue generated from payments for qualified lead generation, prepaid international calls and directory assistance, which are recognized based on actual usage. The Company also earns revenue from the display of advertisements through the Talkatone mobile application, primarily based on advertisement impressions displayed. The Company recognizes revenue from mobile advertising on a net basis, because it is not the primary obligor to advertisers.

Deferred revenue primarily consists of billings or payments received in advance of meeting revenue recognition criteria. The Company’s telephony services are sold as monthly or annual subscriptions, payable in advance. The Company recognizes deferred telephony services revenue on a ratable basis over the term of the contract as the services are provided. For all arrangements, any revenue that has been deferred and is expected to be recognized beyond one year is not significant and is included in long term liabilities in the consolidated balance sheets.

Product and Other Revenue

The Company generates product revenue from the sale of on-premise appliances and end-point devices, including shipping and handling fees. The Company also generates other revenue from porting fees to enable customers to transfer their existing phone numbers. Product and other revenue for direct end-customers are billed to the customer’s credit card at the time an on-line order is submitted by the customer via the Company’s website and recognized when the product has been shipped to the customer. The Company also generates product revenue from sales through distributors, retailers and resellers (collectively the “channel partners”) which are based on written purchase authorizations. The Company’s distribution agreements with its channel partners typically contain clauses for price protection and rights of return, which result in prices for these transactions not being fixed or determinable and increases the difficulty of estimating returns from the channel partners. Accordingly, the Company records shipments to the channel partners, where the right of return exists, as deferred revenue and defers recognition of revenue on these sales until the title transfers to the end-customer. The Company assesses the ability to collect from its channel partners based on a number of factors, including credit worthiness and payment history of the distributor or retail partner. The Company records revenue net of any sales-related taxes that are billed to its customers.

Substantially all of the Company’s arrangements are multiple-element arrangements, which consist of an on-premise appliance and telephony services. The arrangement may also contain a bundled end-point device and a subscription plan for telephony services. Monthly telephony services and end-point devices purchased after the original multi-element arrangement are optional purchases that are accounted for as separate arrangements and are not considered a deliverable in the sale of the on-premise appliance.

The Company has determined that each unit of accounting has stand-alone value and accounts for each separately. The Company allocates revenue to each unit of accounting based on an estimated selling price at the inception of the arrangement. The total arrangement consideration is allocated to each separate unit of accounting using the relative selling price of each unit.

The Company determines the estimated selling price for each deliverable using vendor-specific objective evidence, or VSOE, of selling price or third-party evidence, or TPE, of selling price, if it exists. If neither VSOE nor TPE of selling price exists for a deliverable, the Company uses the best estimate of selling price, or BESP, of each deliverable in its allocation of arrangement consideration. Revenue allocated to each deliverable, limited to the amount not contingent on future performance, is then recognized when the basic revenue recognition criteria are met for the respective deliverable.

The Company determines VSOE of selling price for telephony services and end point devices based on historical standalone sales to customers. In determining VSOE of selling price, the Company requires that a substantial majority of the selling prices for a product or service fall within a reasonably narrow pricing range of the median selling price. The Company does not have VSOE or TPE for its on premise appliance and estimates BESP by considering company-specific factors such as pricing strategies, direct product and other costs, and bundling and discounting practices.

The Company records reductions to revenue for estimated sales returns from end-users and customer credits at the time the related revenue is recognized. Sales returns and customer credits are estimated based on historical experience, current trends and expectations regarding future experience. The Company monitors the accuracy of its sales reserve estimates by reviewing actual returns and credits and adjusts them for future expectations to determine the adequacy of current reserve needs. If actual future returns and credits differ from past experience, additional reserves may be required.

Cash Equivalents and Short-term investments—The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. Short-term investments are classified as available-for-sale for use in current operations, if required, and are reported at fair value, with unrealized gains and losses, net of tax, presented as a separate component of stockholders’ equity (deficit) within accumulated other comprehensive income. All realized gains and losses and unrealized losses resulting from declines in fair value that are other-than-temporary are recorded in other expense, net in the period of occurrence. The Company uses the specific identification method to determine the realized gains and losses on investments. For all investments in marketable securities, the Company assesses whether the impairment is other-than-temporary. If the fair value of a security is less than its amortized cost basis, an impairment is considered other-than-temporary if (i) the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its entire amortized cost basis, or (ii) the Company does not expect to recover the entire amortized cost of the security. If an impairment is considered other-than-temporary based on condition (i), the entire difference between the amortized cost and the fair value of the security is recognized in earnings. If an impairment is considered other-than-temporary based on condition (ii), the amount representing credit losses, defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis of the security, will be recognized in earnings, and the amount relating to all other factors will be recognized in other comprehensive income. The Company evaluates both qualitative and quantitative factors such as duration and severity of the unrealized losses, credit ratings, default and loss rates of the underlying collateral, structure and credit enhancements to determine if a credit loss may exist.

Fair Value of Financial Instruments—The Company records its financial assets and liabilities at fair value. The accounting guidance for fair value provides a framework for measuring fair value, clarifies the definition of fair value, and expands disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:

Level 1 – Quoted prices in active markets for identical assets or liabilities.

Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company recognizes transfers among Level 1, Level 2 and Level 3 classifications as of the actual date of the events or change in circumstances that caused the transfers.

The Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable and accrued liabilities have carrying amounts which approximate fair value due to the short-term maturity of these instruments.

Segment Reporting—The chief operating decision maker for the Company is the Chief Executive Officer. The Chief Executive Officer reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. Accordingly, management has determined that the Company operates in one reportable segment.

The Company markets its products and services in the United States and in foreign countries through its direct sales force and indirect distribution channels. Substantially all of the Company’s revenue, based on the customer’s billing address, was derived from customers in the United States for the years ended January 31, 2016, 2015 and 2014.

All of the Company’s long-lived assets were attributable to operations in the United States as of January 31, 2016 and 2015.

Comprehensive Income—The purpose of reporting comprehensive income is to report a measure of all changes in equity of an entity that result from recognized transactions and other economic events of the period resulting from transactions from non-owner sources. During the year ended January 31, 2016 the Company’s other comprehensive income includes unrealized gains, net of $17,000 from its available-for-sale securities that individually are not considered other-than-temporarily impaired. In fiscal 2015 and 2014 the Company did not have any components of comprehensive income (loss), as such the net loss for both fiscal 2015 and 2014 reported equaled the comprehensive loss.

Net Loss per Share of Common Stock—Basic net loss per common share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period determined using the treasury-stock and if-converted methods. Prior to the completion of the Company’s initial public offering, the Company applied the two-class method for calculating and presenting earnings per share as Series Alpha, Series Alpha -1 and Series Beta convertible preferred stock was considered participating securities due to the rights of cumulative preferred return. The Company’s participating securities did not have a contractual obligation to share in the Company’s losses. As such, the net loss was attributed entirely to common stockholders. Because the Company has reported a net loss for all periods presented, diluted net loss per common share is the same as basic net loss per common share for those periods.

Concentration of Credit Risk—Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash and cash equivalents, short-term investments and accounts receivables. Substantially all of the Company’s cash and cash equivalents and short-term investments are held by financial institutions that management believes are of high-credit quality. Such investments and deposits may, at times, exceed federally insured-limits.

The Company performs credit evaluations of its channel partners’ financial condition and generally does not require collateral for sales made on credit. One customer individually accounted for more than 10% of the Company’s accounts receivable balances at January 31, 2016 and three customers accounted for more than 10% of the Company’s accounts receivable balance at January 31, 2015. The concentration of accounts receivable was as follows:

	As of January 31,
	2016			2015
Customer A		13	%		11	%
Customer B	*				23	%
Customer C	*				10	%

*	represents less than 10% during the period

Accounts Receivable and Allowance for Returns—The Company’s receivables are recorded when billed. The carrying value of the accounts receivable, net of the allowance for returns represents their estimated net realizable value. The Company determines allowances for returns based on its historical experience. As of January 31, 2016 and January 31, 2015 the Company had allowances recorded on the consolidated balance sheets of $0 and $0.2 million, respectively.

Inventories—Inventories, which consist of raw materials and finished goods, are stated at the lower of cost to purchase or the market value of such inventory, and include the cost to purchase manufactured products, allocated labor and overhead. Inventory is valued using the first-in, first-out method for all inventories. The Company writes down the inventory value for estimated excess and obsolete inventory based on management’s assessment of future demand and market conditions, and establishes a new cost basis for the inventory.

Deferred Inventory Costs—Deferred inventory cost represents the inventory that has been shipped to a channel partner for which the retailer or distributor has a right of return. The cost of the product sold is recognized contemporaneously with the recognition of revenue, when the end customer has purchased the on-premise appliance or end-point device.

Website Development Costs—The Company capitalizes certain costs to develop its websites when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. Such costs are amortized on a straight-line basis over the estimated useful life of the related assets, which approximates two years. Costs related to preliminary project activities and post-implementation activities are expensed as incurred. The Company capitalized approximately $0.5 million for each of the years ended January 31, 2016 and 2015, respectively.

Property and Equipment—Property and equipment are stated at cost, less accumulated depreciation. Depreciation is computed over the estimated useful lives of the assets, using the straight-line method, generally three to five years. Leasehold improvements are amortized over the shorter of the lease term or estimated useful lives of the respective assets. Repairs and maintenance costs that do not extend the life or improve the asset are expensed as incurred.

Goodwill and Intangible Assets—The Company records the excess of the acquisition purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. Goodwill of $1.1 million was recognized following the acquisition of Talkatone in fiscal 2015. The Company performs an impairment test of its goodwill in the fourth quarter of its fiscal year, or more frequently if indicators of potential impairment arise. The Company has a single reporting unit and consequently evaluates goodwill for impairment based on an evaluation of the fair value of the Company as a whole. No impairment has been recognized related to the goodwill balance as of January 31, 2016. The Company records purchased intangible assets at their respective estimated fair values at the date of acquisition. Purchased intangible assets are being amortized using the straight-line method over their remaining estimated useful lives, which range from one to seven years.

Impairment of Long-Lived Assets—Long-lived assets, such as property and equipment, capitalized website development costs, and intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. The Company did not record any impairment charges in any of the periods presented.

Convertible Preferred Stock—The Company recorded convertible preferred stock at fair value on the dates of issuance, net of issuance costs. The convertible preferred stock was recorded outside of stockholders’ equity (deficit) because the shares contained liquidation features that were not solely within the Company’s control. The Company had elected not to adjust the carrying values of the convertible preferred stock to the liquidation preferences of such shares because it was uncertain whether or when an event would occur that would obligate the Company to pay the liquidation preferences to holders of shares of convertible preferred stock. On the completion of the IPO all shares of the convertible preferred stock were converted to shares of common stock.

Convertible Preferred Stock Warrant Liability—The Company has recorded freestanding warrants to purchase convertible preferred stock as derivative financial liabilities as the terms of the warrants are not fixed due to potential adjustments in the exercise price and the number of shares issuable under the warrants. Some of the warrants issued in connecting with debt financing provided for adjustment of the exercise price and the number of shares upon an equity financing at a lower price and also provided for a contingent cash settlement, both of which preclude equity classification of the warrants.

The convertible preferred stock warrants were initially recorded at fair value when issued, with gains and losses arising from changes in fair value recognized in other expense in the consolidated statements of operations at each period end while such instruments were outstanding and classified as liabilities. The fair value of the convertible preferred stock warrants issued in connection with debt agreements was recorded as a debt discount that was amortized as non-cash interest expense in the consolidated statement of operations over the expected repayment period of the debt agreement. The Company adjusted the liability for changes in fair value until the completion of the IPO in July 2015. Upon conversion of the underlying preferred stock to common stock, the related warrant liability was remeasured to fair value and the remaining liability was reclassified to additional paid-in capital. The warrant that was subject to contingent cash settlement was settled and the warrant holder was paid $0.6 million.

Shipping and Handling Costs—Shipping and handling costs are expensed as incurred and are included in cost of product and other revenue.

Research and Development—Research and development costs, including new product development, are charged to operating expenses as incurred in the consolidated statements of operations. Such costs included personnel-related costs, including stock-based compensation, supplies, services, depreciation, and allocated facilities costs.

Deferred Offering Costs

Deferred offering costs, consisting of legal, accounting and filing fees related to the initial public offering, were capitalized as other assets and offset against initial public offering proceeds upon the completion of the offering. As of January 31, 2015 the Company had capitalized $0.5 million, respectively, of deferred offering costs in other assets on the consolidated balance sheets.

Advertising—The Company expenses all advertising costs as incurred, except for the cost of producing television advertising, which is expensed on the first date of airing. Advertising costs included in sales and marketing expenses were $13.9 million, $14.8 million and $8.9 million for the years ended January 31, 2016, 2015 and 2014, respectively.

Advertising costs incurred by channel partners are recorded as reduction of revenue or expense as incurred. These costs totaled $0.5 million, $0.8 million and $0.6 million for the years ended January 31, 2016, 2015 and 2014, respectively.

Stock-Based Compensation—Stock-based compensation expense is recognized under ASC 718, Compensation—Stock Compensation. ASC 718 requires companies to recognize the cost of employee services received in exchange for awards of equity instruments based upon the fair value of those awards on the grant date.

The Company’s stock-based awards include stock options, restricted stock units (RSU) and purchase rights under the employee stock purchase plan (ESPP). Stock-based compensation expense for all stock-based awards granted to employees is measured at the grant date based on the fair value of the equity award and is recognized as expense, less expected forfeitures, over the requisite service period, which is generally the vesting period. The forfeiture rate is based on an analysis of actual historic forfeitures. The fair value of options granted is estimated on the date of grant using the Black-Scholes option-pricing model. The fair value of each RSU granted is determined using the fair value of the Company’s common stock on the date of grant. The fair value of each stock purchase right under the Company's ESPP is calculated based on the closing price of the Company's stock on the date of grant and the value of a call and put option estimated using the Black-Scholes pricing model. The Black-Scholes pricing model requires assumptions including the market value of the Company's common stock, expected term of the award, expected volatility of the price of the Company's common stock, risk-free interest rates, and expected dividend yield.

Stock-based compensation expense for options granted to non-employees is calculated using the Black-Scholes option-pricing model and is recognized in the consolidated statements of operations over the service period. Compensation expense for non-employees stock options subject to vesting is remeasured as of each reporting date until the stock options are vested, and any change in value, if any, is recognized in the consolidated statement of operations during the period the related services are performed.

The Company recognizes stock-based compensation expense on the straight-line method for its equity awards. Determining the fair value of stock-based awards at the grant date requires judgment, including estimating the expected volatility, expected term, risk-free interest rate, and expected dividends.

Income Taxes—The Company accounts for income taxes in accordance with ASC 740, Income Taxes, under which deferred tax liabilities and assets are recognized for the expected future tax consequences of temporary differences between financial statement carrying amounts and the tax basis of assets and liabilities and net operating loss and tax credit carryforwards. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized.

A tax position is recognized when it is more likely than not that the tax position will be sustained upon examination, including resolution of any related appeals or litigation processes. A tax position that meets the more likely than not recognition threshold is measured at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority.

Recent Accounting Pronouncements

In March 2016, the Financial Accounting Standard Board (“FASB”) issued accounting standards update (“ASU”) 2016-09, Improvements to Employee Share-Based Payment Accounting. This ASU affects entities that issue share-based payment awards to their employees. The ASU is designed to simplify several aspects of accounting for share-based payment award transactions which include – the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows and forfeiture rate calculations. ASU 2016-09 will become effective for the Company in the first quarter of fiscal 2018. Early adoption is permitted in any interim or annual period. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. This ASU requires assets and liabilities arising from leases, including operating leases, to be recognized on the balance sheet. ASU 2016-02 will become effective for the Company in the first quarter of fiscal 2020, and requires adoption using a modified retrospective approach. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes, which simplifies the presentation of deferred income taxes. The ASU requires that deferred tax assets and liabilities be classified as non-current in a statement of financial position, thereby simplifying the current guidance that requires an entity to separate deferred assets and liabilities into current and noncurrent amounts. The Company early adopted ASU 2015-17 as of January 31, 2016 on a prospective basis. The statement of financial position as of January 31, 2016 reflects the classification of deferred tax assets and liabilities as noncurrent. No prior periods were retrospectively adjusted because such an adjustment was not material and does not affect comparability.

In July 2015, the FASB issued ASU No. 2015-11 (ASC 330), Simplifying the Measurement of Inventory. Update No. 2015-11 requires companies to measure inventory using the lower of cost and net realizable value. It is effective for annual reporting periods beginning after December 15, 2016 and interim periods within those fiscal years. The Company is currently evaluating the impact, if any, of this guidance on its consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15 (ASC 205), Disclosure of Uncertainties About an Entity’s Ability to Continue as a Going Concern. The new standard provides guidance around management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which affects any entity that either enters into contracts with customers to transfer goods and services or enters into contracts for the transfer of nonfinancial assets. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the currently effective guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. In July 2015, the FASB approved a one-year deferral of the effective date of the standard with the issuance of by ASU 2015-14, Revenue from Contracts with Customers (ASC 606) Deferral of Effective Date. As a result, ASU 2014-09 will become effective for the Company in the first quarter of fiscal 2019 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. Early adoption is permitted but not before the original effective date of annual periods beginning after December 15, 2016. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

Fair Value Measurement

12 Months Ended

Jan. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurement

3. FAIR VALUE MEASUREMENT

The Company’s financial assets and liabilities that are measured at fair value on a recurring basis by level within the fair value hierarchy are as follows (in thousands):

	As of January 31, 2016
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	3,462	$	—	$	—	$	3,462
Commercial paper		—		3,499		—		3,499
Total cash equivalents	$	3,462	$	3,499	$	—	$	6,961
Cash								20,452
Total Cash and cash equivalents							$	27,413

Short-term investments:
Corporate debt securities	$	—	$	7,845	$	—	$	7,845
Commercial paper		—		4,986		—		4,986
U.S. agency securities		—		7,666		—		7,666
U.S. government securities		7,494		—		—		7,494
Total short-term investments	$	7,494	$	20,497	$	—	$	27,991

Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	288	$	288
Total liabilities	$	—	$	—	$	288	$	288

	Balance as of January 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	9,018	$	—	$	—	$	9,018
Total cash equivalents	$	9,018	$	—	$	—	$	9,018
Cash								115
Total Cash and cash equivalents							$	9,133

Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	1,695	$	1,695
Convertible preferred stock warrant liability		—		—		1,217		1,217
Total liabilities	$	—	$	—	$	2,912	$	2,912

There were no transfers into or out of the Level 3 category during the years ended January 31, 2016 and 2015.

Preferred Stock Warrant Liabilities—The estimated fair values of outstanding preferred stock warrant liabilities were measured using Monte-Carlo simulation and Black-Scholes valuation models. These valuation models involved using such inputs as the estimated fair value of the underlying stock at the measurement date, risk-free interest rates, expected dividends on stock and expected volatility of the price of the underlying stock. Due to the nature of these inputs, the valuation of the warrants was considered a Level 3 measurement.

Acquisition-related Contingent Consideration—The Company estimated the fair value of the acquisition-related contingent consideration using a probability-weighted discounted cash flow model. Key assumptions include the level and timing of expected future revenue and expenses of the acquired business, and discount rates consistent with the level of risk and economy in general. If the income projections increase or decrease, the fair value of the contingent consideration would increase or decrease accordingly, in amounts that will vary based on the timing of the projected income; and the discount rate used to calculate the present value of the expected income. This fair value measure was based on significant inputs not observed in the market and thus represented a Level 3 instrument. The change in fair value of acquisition-related contingent consideration is included in general and administrative expenses in the consolidated statements of income, and the contingent consideration is included in accrued liabilities on the consolidated balance sheets. The Company remeasured the contingent consideration for fiscal 2016 and recorded a $0.3 million reduction in the previously recorded expense.

As of January 31, 2016, the Level 3 liabilities consisted of acquisition-related contingent consideration. As of January 31, 2015, the Level 3 liabilities consists of the Company’s convertible preferred stock warrant liability and acquisition-related contingent consideration.

	Convertible Preferred Stock Warrant Liability			Acquisition-Related Contingent Consideration
Balance at January 31, 2015	$	1,217		$	1,695
Payout of consideration		—			(675	)
Issuance of shares		—			(451	)
Changes in fair value		442			(281	)
Payment of preferred warrant liability upon IPO		(584	)		—
De-recognition of preferred warrant liability to additional paid-in capital		(1,075	)		—
Balance at January 31, 2016	$	—		$	288

Level 3 instruments consisted of the Company’s preferred stock warrant liability. Prior to the Company’s IPO, outstanding warrants to purchase shares of the Company’s convertible preferred stock were classified as other liabilities. At every reporting date the warrants were remeasured and the change in the fair value was recorded as a component of other (expense) income, in the consolidated statement of operations and liabilities on the consolidated balance sheet.

Upon the closing of the Company’s IPO, a warrant to purchase 70,287 shares of Series Alpha convertible preferred stock was remeasured at the initial offering price of $13.00 per share less the exercise price of $4.70 per share. The total warrant liability of $0.6 million related to this warrant was cash settled. The aggregate fair value of the other warrants was de-recognized and reclassified from liabilities to additional paid-in capital, a component of stockholders’ equity (deficit), and the Company ceased recording any further changes.

The carrying value of the Company’s accounts receivable, inventory and other current assets and current liabilities approximates fair value due to short maturities.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Short-term Investments

12 Months Ended

Jan. 31, 2016

Investments Debt And Equity Securities [Abstract]

Short-term Investments

4. SHORT-TERM INVESTMENTS

Short-term investments consisted of the following (in thousands):

	As of January 31, 2016
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	7,851	$	(6	)	$	—	$	7,845
Commercial paper		4,985					1		4,986
U.S. agency securities		7,661					5		7,666
U.S. government securities		7,477					17		7,494
Total short-term investments	$	27,974	$	(6	)	$	23	$	27,991

The Company did not have any gross realized gains and gross realized losses for the years ended January 31, 2016, 2015 and 2014.

The cost basis and fair value of the short-term investments by contractual maturity consist of the following (in thousands):

	As of January 31, 2016
	Amortized Value		Fair Value
One year or less	$	19,143	$	19,145
Over one year and less than two years		8,831		8,846
Total	$	27,974	$	27,991

Prior to fiscal 2016 the company held all its cash in cash and money market funds.

Investments in an unrealized loss position consisted of the following (in thousands):

	As of January 31, 2016
	Fair Value		Unrealized Losses
Corporate debt securities	$	7,845	$	(6	)

The Company reviews the individual securities in its portfolio to determine whether a decline in a security’s fair value below the amortized cost basis is other-than-temporary. The Company determined that as of January 31, 2016 and 2015 there were no investments in its portfolio that were other-than-temporarily impaired. The Company does not intend to sell any of these investments, and it is not more likely than not that the Company would be required to sell these investments before recovery of their amortized cost basis, which may be at maturity.

Goodwill and Intangible Assets

12 Months Ended

Jan. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

5. GOODWILL AND INTANGIBLE ASSETS

The Company recognized $1.5 million in intangibles and $1.1 million in goodwill following the acquisition of Talkatone, Inc. in fiscal 2015. There was no change to goodwill subsequent to the acquisition.

The carrying values of intangible assets other than goodwill are as follows (in thousands):

		As of January 31, 2016							As of January 31, 2015
	Estimated Life (in years)	Gross Value		Accumulated Amortization			Net Carrying Amount		Gross Value		Accumulated Amortization			Net Carrying Amount
Developed technology	5	$	815	$	(285	)	$	530	$	815	$	(123	)	$	692
User relationships	3.5		458		(229	)		229		458		(98	)		360
Trade name	5		103		(36	)		67		103		(16	)		87
Non-compete agreement	2		118		(104	)		14		118		(44	)		74
Patents and licenses	3.8-7		714		(669	)		45		714		(649	)		65
Total		$	2,208	$	(1,323	)	$	885	$	2,208	$	(930	)	$	1,278

At January 31, 2016 the estimated amortization expense related to the intangible assets is as follows (in thousands):

Years Ending January 31,
2017	$	349
2018		291
2019		190
2020		52
2021 and thereafter		3
Total	$	885

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Balance Sheet Components

12 Months Ended

Jan. 31, 2016

Balance Sheet Components [Abstract]

Balance Sheet Components

6. BALANCE SHEET COMPONENTS

Inventories consist of the following (in thousands):

	As of January 31,
	2016		2015
Finished goods	$	4,633	$	5,719
Raw material		378		2,362
Total inventory	$	5,011	$	8,081

Deferred revenue, consists of the following (in thousands):

	As of January 31,
	2016		2015
Deferred revenue:
Subscription and services	$	11,954	$	9,860
Product and other		3,118		4,523
Total deferred revenue		15,072		14,383
Less: current portion of deferred revenue		15,036		14,348
Deferred revenue, noncurrent portion included in other long-term liabilities	$	36	$	35

Property and equipment, net consists of the following (in thousands):

		As of January 31,
	Estimated Life (in years)	2016			2015
Software and computer equipment	3-4	$	6,615		$	4,963
Website development costs	2		1,675			1,216
Machinery and equipment	3		1,207			644
Office furniture and fixtures	5		57			52
Leasehold improvements	shorter of estimated life of asset or remaining lease term		372			251
Total property and equipment		$	9,926		$	7,126
Less: accumulated depreciation and amortization			(5,635	)		(4,233	)
Property and equipment, net		$	4,291		$	2,893

Depreciation and amortization of property and equipment totaled $1.4 million, $0.9 million and $0.8 million for the years ended January 31, 2016, 2015 and 2014, respectively.

Computer equipment under a capital lease agreement at January 31, 2016 and January 31, 2015 was $1.5 million and $1.5 million, respectively, and the related accumulated depreciation was $0.5 million and $0.2 million, respectively.

Accrued expenses consist of the following (in thousands):

	As of January 31,
	2016		2015
Accrued regulatory fees and taxes	$	5,216	$	4,762
Accrued payroll and related expenses		3,559		2,022
Acquisition-related contingent consideration-current portion		288		1,027
Other accrued expenses		3,947		2,502
Total accrued expenses	$	13,010	$	10,313

Debt

12 Months Ended

Jan. 31, 2016

Debt Disclosure [Abstract]

Debt

7. DEBT

In April 2012, (amended in October 2012), the Company entered into a secured debt agreement (“Term Debt”) in the amount of $4.0 million. The debt had a maturity date in September 2015 and a fixed interest rate of 5.75%. The Company made monthly interest-only payments through September 2012, and monthly payments of principal and interest thereafter. In July 2015, the Company paid off the remaining balance of $0.3 million using a portion of the IPO proceeds.

In December 2012, the Company entered into an amended secured debt agreement, adding a revolving line of credit in the amount of $6.0 million (“the Revolver”). The interest rate on the Revolver is 2.75% above the prime rate (3.5% at January 31, 2016). The Revolver includes a financial covenant that the Company is required to have a certain number of subscribers each quarter. The Revolver was originally due to mature in December 2014. In July 2014, the Company entered into an amended agreement to extend the maturity date until July 2016. In October 2014, the Company borrowed $5.0 million under the Revolver. The outstanding debt of $5.0 million was repaid in July 2015 using a portion of the IPO proceeds.

In January 2015, the Company entered into an amended line of credit under a loan and security agreement with its current lender which increased the amount available under the Revolver to $12.0 million and added a new line of credit of up to $10.0 million. The Company’s credit agreements with its lender contain customary negative covenants that limit the ability to, among other things, incur additional indebtedness, grant liens, make investments, repurchase stock, pay dividends, transfer assets and merge or consolidate. In January 2015, the Company drew down $5.0 million of this new line of credit. The interest rate on advances under the line of credit is 11%, and interest is payable monthly. The original maturity date of the line of credit was January 2018. The Company repaid this outstanding debt of $5.0 million in July 2015 using a portion of the IPO proceeds. In connection with the agreement, the Company issued warrants to purchase 76,630 shares of the Company’s common stock with an exercise price of $6.04 per share that are exercisable until January 2025. As of January 31, 2016, these warrants remained outstanding.

The Company has certain non-financial covenants in connection with the borrowings. As of January 31, 2016 the Company was in compliance with all the covenants under the Revolver agreement.

As of January 31, 2016 the amount available under the Revolver agreement was $12.0 million.

Total interest expense recognized was $0.9 million, $0.3 million and $0.3 million in each year ended January 31, 2016, 2015 and 2014, respectively. Total amortization of debt issuance costs recognized was $0.1 million for each of the fiscal years ended January 31, 2016, 2015 and 2014, respectively.

Total interest expense during fiscal year ended January 31, 2016 included $0.3 million related to the write-off of non-cash deferred issuance costs due to the repayment of all of the outstanding debt in July 2015.

As of January 31, 2016, $0.6 million of the outstanding debt on the consolidated balance sheet related to equipment acquired under capital lease.

The aggregate debt outstanding at each balance sheet date was as follows (in thousands):

	Term Debt			Capital Lease Obligations		Total
Debt as of January 31, 2016	$	—		$	632	$	632
Less: unamortized discounts and issuance costs		—			—		—
Net carrying value of debt		—			632		632
Less: short-term debt and capital lease obligations		—			632		632
Long-term debt and capital lease obligations	$	—		$	—	$	—

Debt as of January 31, 2015	$	11,058		$	1,298	$	12,356
Less: unamortized discounts and issuance costs		(396	)		—		(396	)
Net carrying value of debt		10,662			1,298		11,960
Less: short-term debt and capital lease obligations		896			666		1,562
Long-term debt and capital lease obligations	$	9,766		$	632	$	10,398

The outstanding future principal payments for capital leases as of January 31, 2016 are payable within the next 12 months.

Convertible Preferred Stock Warrant Liability

12 Months Ended

Jan. 31, 2016

Equity [Abstract]

Convertible Preferred Stock Warrant Liability

8. CONVERTIBLE PREFERRED STOCK WARRANT LIABILITY

At each balance sheet date, the Company had the following warrants to purchase convertible preferred stock outstanding:

			Fair value				Fair value
	Warrants		of Warrants		Warrants		of Warrants
	outstanding		Liabilities as of		outstanding		Liabilities as of
	as of		January 31, 2015		as of		January 31, 2016
	January 31, 2015		(in thousands)		January 31, 2016		(in thousands)
December 2010 warrant		70,287	$	474		—	$	—
April 2012, December 2012 and October 2014 warrants		66,026		374		—		—
May and June 2009 warrants		55,696		369		—		—
Total		192,009	$	1,217		—	$	—

In December 2010, the Company issued a warrant to purchase 70,287 shares of Series Alpha convertible preferred stock at an exercise price of $4.70 per share. On completion of the IPO, the Company remeasured the warrant at the IPO price of $13.00 per share, after deducting the exercise price the fair value of the warrant was determined to be $0.6 million. The warrant was cash settled and the Company paid $0.6 million to the warrant holder upon the IPO.

The warrant was initially measured at its fair value and recorded as a derivative liability. On each reporting date the change in fair value of the warrant was determined based on a Monte-Carlo valuation model or IPO pricing on payout. The Company recorded a remeasurement loss of $0.1 million and $0.3 million during fiscal year ended January 31, 2016 and 2015, respectively.

In April 2012, December 2012 and October 2014, the Company issued warrants to purchase an aggregate of 66,026 shares of Series Alpha convertible preferred stock with an exercise price of $4.70 per share in connection with a debt agreement with a lender. The warrants had expiration dates ranging from April 2022 to December 2022. The Company recorded the warrants as a derivative liability and a debt discount on issuance date. The warrants were initially measured at fair value and remeasured at every reporting period date using Monte-Carlo valuation model. The Company recorded a remeasurement loss of $0.3 million and $0.2 million during fiscal year ended January 31, 2016 and 2015, respectively. Upon completion of the IPO in July 2015, the total aggregate liability of $0.7 million related to these warrants was derecognized and reclassified to additional paid in capital which then automatically converted into warrants to purchase shares of common stock on a 1:1 basis. During the fourth quarter of fiscal 2016, the lender net exercised 66,026 warrants at an exercise price of $4.70 per share to 21,421 shares of common stock.

In June 2009, the Company issued warrants to purchase 34,397 shares of Series Alpha convertible preferred stock and in May 2009, the Company issued warrants to purchase 21,299 shares of convertible preferred stock. The Company recorded the warrants to purchase shares of convertible preferred stock as derivative liabilities. These warrants were initially measured at fair value and remeasured at every reporting period date using a Black Scholes valuation model and the change in the fair value was recorded in other expense in the consolidated statement of operations. The Company recorded a remeasurement loss of $0.1 million and $0.3 million during fiscal year ended January 31, 2016 and 2015, respectively.

Upon completion of the IPO on July 22, 2015, of the warrants to purchase 34,397 shares of Series Alpha convertible preferred stock issued in June 2009, warrants to purchase 2,769 shares of Series Alpha convertible preferred were cash exercised at an exercise price of $4.70 per share to 2,769 shares of common stock; warrants to purchase 21,529 shares of Series Alpha convertible preferred stock were net exercised using the IPO price of $13.00 per share net of the exercise price of $4.70 per share to 13,752 shares of common stock; and warrants to purchase 10,099 shares were terminated due to failure to exercise on or before the IPO per the terms of the warrant agreement. The Company recognized a gain of $0.1 million on the termination of 10,099 warrants. The IPO also triggered the 21,299 warrants issued in May 2009, to convert to common warrants to purchase 21,299 shares of common stock. The total aggregate liability of $0.4 million related to these warrants was derecognized and reclassified to additional paid in capital.

The following assumptions were used to calculate the fair value of the warrants:

	For the period ended	For the year ended January 31,
	July 22, 2015	2015		2014
Assumptions:
Expected volatility	66%-70%		70%		70%
Expected term (in years)	0-1.1	1.3-1.4		0.1-2.4
Risk-free interest rate	0%-0.3%		0.3%	0.3%-0.5%

Dividend yield	—%	—%		—%

Common Stock and Preferred Stock

12 Months Ended

Jan. 31, 2016

Equity [Abstract]

Common Stock and Preferred Stock

9. COMMON STOCK AND PREFERRED STOCK

Reverse Stock Split

On July 6, 2015, the Company effected a one-for-two reverse stock split of its outstanding common stock, convertible preferred stock, stock options, warrants to purchase preferred stock and warrants to purchase common stock as approved by its Board. All information in this Annual Report on Form 10-K relating to the number of shares, price per share and per share amounts have been adjusted to give effect to the one-for-two reverse stock split.

Convertible Preferred Stock

Upon the closing of the IPO on July 22, 2015, all of the Company's outstanding Series Alpha and Series Alpha-1 convertible preferred stock converted into 8,353,748 shares of common stock on a 1:1 basis and 241,469 shares of Series Beta preferred stock converted into 525,109 shares of common stock.

Prior to the closing of the Company's IPO on July 22, 2015 and as of January 31, 2015, the Company had the following convertible preferred stock outstanding:

	As of July 22, 2015								As of January 31, 2015
	Shares authorized		Shares issued and outstanding		Aggregate liquidation preference		Carrying value		Shares authorized		Shares issued and outstanding		Aggregate liquidation preference		Carrying value
					(in thousands)								(in thousands)
Convertible preferred series Alpha		8,060,629		7,868,605	$	36,943	$	30,632		8,125,000		7,868,605	$	36,943	$	30,632
Convertible preferred series Alpha-1		485,146		485,143		19,490		3,005		583,333		485,143		19,490		3,005
Convertible preferred series Beta		471,635		241,469		5,120		5,000		—		—		—		—
Total convertible preferred stock		9,017,410		8,595,217	$	61,553	$	38,637		8,708,333		8,353,748	$	56,433	$	33,637

The holders of Series Alpha, Series Alpha-1, and Series Beta preferred stock collectively, the preferred stock had the following rights and preferences:

Dividends—The holders of preferred stock were entitled to receive dividends, out of assets legally available therefor, prior and in preference to any declaration or payment of any other dividends, at the rates of $0.3756, $3.214 and $1.6962 per share (adjusted to reflect stock splits, stock dividends, reclassifications, and the like) per annum on each outstanding share of Series Alpha, Series Alpha-1, and Series Beta preferred stock, respectively, when, as and if, declared by the board of directors. Such dividends were not cumulative and no dividends had been declared to date.

Liquidation Preference—In a liquidation, dissolution, or winding-up of the Company, either voluntary or involuntary, the holders of Series Alpha and Series Beta preferred stock were entitled to receive, prior and in preference to any distribution to the holders of Series Alpha-1 preferred stock or common stock, an amount equal to $4.70 per share and $21.2028 per share, respectively, adjusted to reflect stock splits, etc., plus any declared or accrued but unpaid dividends. If the assets and funds were insufficient to permit the full payment to the holders of the Series Alpha and Series Beta preferred stock, then the entire assets and funds legally available for distribution would have been distributed ratably among the holders of the Series Alpha and Series Beta preferred stock. Holders of the Series Alpha-1 preferred stock would have been entitled to receive, prior and in preference to a distribution to the holders of common stock, an amount equal to $40.1740 per share, as adjusted for stock splits, etc., plus any declared or accrued but unpaid dividends. If the assets and funds were insufficient to permit the full payment to the holders of Series Alpha-1 preferred stock, then the entire assets and funds legally available for distribution would have been distributed ratably among the holders of the Series Alpha-1 preferred stock. Upon completion of the required distributions to the holders of preferred stock, the holders of the common stock would have received all of the remaining assets of the Company.

A sale or licensing of substantially all of the Company’s property or a merger or consolidation with another corporation was a deemed liquidation of the Company, unless determined otherwise by the holders of a majority of the preferred stock voting together as a single class assuming the conversion of all preferred stock into common stock.

Conversion—Each share of preferred stock (except the Series Beta) was convertible, at the option of the holder, into one share of common stock, subject to adjustment for stock splits, stock dividends, and recapitalizations. Conversion of each share of preferred stock was automatic upon the earlier of (i) a firm commitment underwritten public offering that valued the Company at not less than $100 million and that resulted in proceeds to the Company of not less than $50 million or (ii) a date that was specified by a vote of the holders of a majority of the preferred stock. In the event the Company completed a liquidation transaction or qualified initial public offering in which the conversion price for the Series Beta preferred stock was greater than 75% of the consideration per share or offering price, the conversion price had to automatically adjust to 75% of the consideration per share or offering price.

Voting Rights—Except as expressly provided in the Company’s certificate of incorporation, as amended or as provided by law, holders of preferred stock had the same voting rights as holders of common stock, and were entitled to the number of votes equal to the number of shares of common stock into which shares of preferred stock could be converted. For the election of members of the board of directors, the holders of the Series Alpha preferred stock, voting as a separate class, were entitled to elect three directors; the holders of the common stock, voting as a separate class, were entitled to elect one director; and the holders of the preferred stock and the common stock, voting together as a single class on an as-converted basis, were entitled to elect all remaining directors.

In addition, the holders of a majority of the preferred stock, voting together as a single class, would approve certain actions, including liquidation; changing the rights of the preferred stock; declaring or paying a dividend; redeeming or otherwise acquiring shares of preferred stock or common stock, other than pursuant to certain rights of repurchase; issuing any debt if the aggregate indebtedness would exceed $100,000; changing the number of directors; amending the certificate of incorporation or bylaws; increase or decrease (other than by conversion) the total number of common stock or preferred stock; or authorizing any equity security with preference over or on parity with preferred stock.

Common Stock and Preferred Stock

On July 6, 2015, the Company filed an amended and restated certificate of incorporation to increase the amount of common stock authorized for issuance to 100,000,000 shares with a par value of $0.0001 per share and 10,000,000 shares with a $0.0001 par value per share of preferred stock.

As of January 31, 2016 the Company had 16,916,250 shares of common stock outstanding which includes the 5,000,000 shares issued in the IPO. The Company did not have any shares of preferred stock issued and outstanding as of January 31, 2016.

Common Stock Reserved for Future Issuance

The Company had shares of common stock reserved for issuance as follows:

	Year ended January 31,
	2016		2015
Conversion of Series Alpha preferred stock		—		7,868,605
Conversion of Series Alpha-1 preferred stock		—		485,143
Total conversion of preferred stock		—		8,353,748

Warrants to purchase Series Alpha preferred stock		—		192,009
Warrants to purchase common stock		97,931		87,828
Options to purchase common stock outstanding		2,087,584		1,893,239
Options available for future grant under stock option plan		1,254,404		133,029
Shares reserved under Employee Stock Purchase Plan		425,596		—
Restricted stock units outstanding		1,056,905		—
Total shares reserved for issuance		4,922,420		10,659,853

Early Exercise of Common Stock

During the years ended January 31, 2016 and 2015 the Company issued 0 and 131,810 shares, respectively, of common stock following the exercise of common stock options prior to their vesting dates, or early exercises. The amounts received from all such early exercises is recorded in accrued expenses on the consolidated balance sheets and reclassified to stockholders’ equity (deficit) as the options vest. The unvested shares are subject to the Company’s repurchase right at the original purchase price, which lapses over the vesting term of the original option grant. As of January 31, 2016 and 2015, there were 173,404 and 502,359 shares, respectively, legally outstanding, but not included within common stock outstanding for accounting purposes as a result of the early exercise of common stock options that were not yet vested. As of January 31, 2016 and 2015, the aggregate price of shares subject to repurchase recorded in accrued expenses totaled $0.2 million and $0.3 million, respectively.

Stockholders' Equity

12 Months Ended

Jan. 31, 2016

Equity [Abstract]

Stockholders' Equity

10. STOCKHOLDERS’ EQUITY (DEFICIT)

Equity Award Plans

2005 Stock Plan

The Board of Directors adopted, and the stockholders approved, the Company’s 2005 Stock Plan (the “2005 Plan”), in April 2005. The 2005 Plan provides for the grant of incentive stock options to its employees (and employees of its subsidiaries), and for the grant of non-statutory stock options and stock purchase rights to its employees, directors and consultants (and employees and consultants of its subsidiaries). In May 2015, the board of directors increased the maximum number of shares that can be issued under the 2005 Plan by 250,000 shares to 4,433,102. In June 2015, the 2005 Plan was amended and restated in the form of the 2015 Equity Incentive Plan described below. The terms of the 2005 Plan as described in the Prospectus will continue to govern the terms and conditions of the outstanding awards previously granted thereunder.

2015 Equity Incentive Plan

In June 2015, the Company amended and restated its 2005 Plan in the form of 2015 Equity Incentive Plan (the “2015 Plan”) which became effective immediately upon the effectiveness of the Company’s IPO. The 2015 Plan provides for the grant of incentive stock options to its employees and any of its subsidiary corporations’ employees, and for the grant of non-statutory stock options, stock appreciation rights, restricted stock, restricted stock units, performance units and performance shares to its employees, directors and consultants and its subsidiary corporations’ employees and consultants. The maximum aggregate number of shares that may be issued under the 2015 Plan is 4,433,102 shares (which is the number of shares previously reserved for issuance under the 2005 Plan) plus 2,205,828 shares which is the number of shares equal to 10% of its outstanding shares of common stock measured at the time of completion of its IPO (as determined on a fully diluted basis, including the shares reserved under its equity plans). In addition, the number of shares available for issuance under the 2015 Plan will be annually increased on the first day of each of its fiscal years beginning with fiscal 2017, by an amount equal to the lessor of (i) 5% of the outstanding shares of its common stock as of the last day of its immediately preceding fiscal year; and (ii) such other amount as the Company’s board of directors may determine.

As of January 31, 2016, the Company had 1,254,404 shares available for future issuance.

Employee Stock Purchase Plan

In conjunction with the completion of its IPO, the Company adopted the 2015 Employee Stock Purchase Plan (“ESPP”). The ESPP has 441,165 shares authorized for future issuance. The number of authorized shares under the ESPP is subject to increase on an annual basis. The ESPP allows eligible employees to purchase shares of common stock at a discount through payroll deductions of up to 15% of their eligible compensation subject to plan limitations. The ESPP provides for a 24-month offering period comprised of four purchase periods of approximately six months. Employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s common stock (i) at the date of commencement of the offering period or (ii) at the last day of the purchase period. The offering periods are scheduled to start on the first trading day on or after March 15 and September 15 of each year, except for the first offering period, which commenced on the first trading day upon the completion of the Company’s IPO, or July 17, 2015, and ends on September 15, 2017. During the year ended January 31, 2016, there was a purchase of 15,569 shares at a purchase price of $7.12 per share.

On September 15, 2015 the Company started a new offering period at a new offering price based on the closing price of the Company’s common stock on the same date. The Company concluded that starting a new offering period prior to the completion of the existing offering period resulted in an accounting modification and accordingly, calculated $0.4 million of incremental expense that will be recognized over the remaining term of the ESPP offering period. During the year ended January 31, 2016 the Company recorded stock-based compensation expense of $0.4 million related to the ESPP.

Stock Options

Options to purchase shares of common stock may be granted to employees, directors, and consultants. These options vest from date of grant to up to five years and expire 10 years from the date of grant. Options may be exercised anytime during their term in accordance with the vesting/exercise schedule specified in the recipient’s stock option agreement and in accordance with the plan provisions. Shares issued upon exercise prior to vesting, are subject to a right of repurchase, which lapses according to the original option vesting schedule.

Summary of the Company’s stock option activity is as follows:

	Number of			Weighted Average		Weighted Average		Aggregate
	Options			Exercise Price		Contractual Term		Intrinsic Value
	Outstanding			Per Share		(in Years)		(in thousands)
Balance as of January 31, 2015		1,893,239		$	3.85		8.4	$	10,109
Options granted		427,948		$	12.55
Options exercised		(83,229	)	$	0.79
Options canceled		(150,374	)	$	6.16
Balance as of January 31, 2016		2,087,584		$	5.59		7.9	$	4,843
Vested and exercisable - January 31, 2016		706,322		$	1.90		5.7	$	3,682
Vested and expected to vest - January 31, 2016		2,005,813		$	5.50		7.8	$	4,779

The aggregate intrinsic value of vested options exercised during the years ended January 31, 2016, 2015 and 2014 was $0.8 million, $0.5 million and $0.1 million, respectively.

The weighted-average grant date fair value of options granted during the years ended January 31, 2016, 2015 and 2014 was $6.92, $5.20 and $0.82 per share, respectively.

Restricted Stock Units

Restricted Stock Units (RSUs) were granted to employees, non-employee board members and consultants. These RSUs vest ratably over a period of time which ranges from one to four years, and are subject to the participant’s continuing service to the Company over that period. Until vested, RSUs do not have the voting and dividend participation rights of common stock and the shares underlying the awards are not considered issued and outstanding.

A summary of the Company’s RSU activity and related information for year ended January 31, 2016 is as follows:

	Number of Shares			WeightedAverage Grant-Date Fair Value Per Share		WeightedAverage Remaining Vesting Period (Years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2015		—		$	—		—	$	—
RSUs granted		1,157,105			9.62
RSUs vested		—			—
RSUs canceled		(100,200	)		9.74
Balance as of January 31, 2016		1,056,905		$	9.60		1.43	$	7,176

No RSU’s were vested for the year ended January 31, 2016. The Company did not grant any RSUs prior to fiscal 2016.

Common Stock Warrants

A summary of the Company’s common stock warrants activity is as follows:

	Common Warrants Outstanding
Balance as of January 31, 2015		87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO		87,325
Less: Common warrants exercised to common stock		(30,573	)
Less: Common warrants terminated		(46,649	)
Balance as of January 31, 2016		97,931

These warrants have exercise prices ranging from $4.70 to $6.04 per share and have expiration dates through January 2025.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-Paragraph 5
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.3-04)
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Paragraph 2
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

+ Details

Stock-Based Compensation

12 Months Ended

Jan. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

11. Stock-Based Compensation

The total stock-based compensation the Company recognized for stock-based awards in the consolidated statements of operations is as follows (in thousands):

	Year ended January 31,
	2016		2015		2014
Total cost of revenue	$	437	$	36	$	7
Sales and marketing		611		41		6
Research and development		1,683		169		26
General and administrative		1,922		180		33
Total stock-based compensation expense	$	4,653	$	426	$	72

The following table presents stock-based compensation expense by award-type (in thousands):

	Year ended January 31,
	2016		2015		2014
Stock options	$	2,607	$	426	$	72
Restricted stock units		1,644		—		—
Employee stock purchase plan		402		—		—
Total stock-based compensation expense	$	4,653	$	426	$	72

As of January 31, 2016, there was $5.8 million, $7.7 million and $1.2 million of unrecognized share-based compensation expense, net of estimated forfeitures, related to non-vested stock option grants, unvested RSUs and ESPP, respectively, which will be recognized on a straight-line basis over the remaining weighted-average vesting periods of approximately 2.5 years, 2.4 years and 0.9 years, respectively.

Total outstanding non-employee stock options were 70,199 and 67,884 at January 31, 2016 and 2015, respectively. The total outstanding non-employee RSUs were 70,500 and 0 at January 31, 2016 and 2015, respectively. The non-employee stock-based compensation expense for stock options and RSU’s was $0.2 million and $0.1 million, respectively for the fiscal year ended January 31, 2016. The non-employee stock-based compensation expense for the stock options was not material for fiscal year ended January 31, 2015.

Prior to the Company’s IPO, the fair value of the shares of common stock underlying stock options was historically established by the Company’s Board of Directors, and was based in part upon a valuation provided by an independent third-party valuation firm. Subsequent to the completion of the IPO, the Company uses the closing price of common stock as reported on the New York Stock Exchange on the grant date. The Company has consistently used peer company volatilities for calculating the expected volatilities for employee stock options and the ESPP. The expected term of options granted to employees is based on the simplified method as the Company does not have sufficient historical exercise data, and the expected term of the ESPP is based on the contractual term. The risk-free interest rate for the expected term of the options and the ESPP is based on the U.S. Treasury yield curve in effect at the time of grant. The Company recognizes its stock-based compensation related to options and RSUs using a straight-line method over the vesting term. The Company recognizes its stock-based compensation related to ESPP using a straight-line method over the offering period.

For the years ended January 31, 2016, 2015 and 2014 the calculated fair value of employee stock options grants was estimated using the Black – Scholes model with the following assumptions:

	Year ended January 31,
	2016	2015	2014
Stock Options:
Expected volatility	54%-62%	69%-81%	77% - 79%
Expected term (in years)	5.3-6.1	5.4-6.3	5.1-6.3
Risk-free interest rate	1.6%-1.9%	1.5%-2.0%	0.8%-2.2%
Dividend yield	—%	—%	—%

The grant date fair value of the ESPP was estimated using the following assumptions:

						For the year ended January 31,
						2016
ESPP:
Expected volatility						35%-44%
Expected term (in years)						0.5-2.2
Risk-free interest rate						0.1%-0.8%
Dividend yield						—%

The Company did not have a ESPP prior to fiscal 2016.

Income Taxes

12 Months Ended

Jan. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

12. INCOME TAXES

Income tax expense differed from the amount computed by applying the federal statutory income tax rate of 34% to pretax loss as a result of the following (in thousands):

	Year ended January 31,
	2016			Rate			2015			Rate			2014			Rate
Federal tax at statutory rate	$	(4,787	)		34	%	$	(2,350	)		34	%	$	(680	)		34	%
Change in valuation allowance		4,502			(32	)%		2,132			(31	)%		831			(42	)%
State taxes		(261	)		2	%		(437	)		6	%		(156	)		8	%
Stock-based compensation		691			(5	)%		92			(1	)%		14			(1	)%
Research and development credit		(273	)		2	%		(192	)		3	%		(131	)		7	%
Permanent tax adjustment		128			(1	)%		23			—			104			(5	)%
Other		—			—			230			(3	)%		18			(1	)%
Total	$	—			—		$	(502	)		8	%	$	—			—

Income tax expense differs from the amount computed by applying the statutory federal income tax rate primarily as the result of changes in the valuation allowance.

The tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and liabilities related to the following (in thousands):

	As of January 31,
	2016			2015
Deferred tax assets:
Accruals and reserves	$	2,297		$	2,036
Stock-based compensation		1,334			436
Intangible assets amortization		110			243
Deferred revenue		13			15
Fixed assets depreciation		—			168
Net operating loss carry forwards		24,869			22,240
Tax credit carryover		1,558			1,241
Gross deferred tax assets		30,181			26,379
Valuation allowance		(29,868	)		(25,785	)
Net deferred tax assets	$	313		$	594
Deferred tax liabilities:
Acquired intangible assets	$	(301	)	$	(594	)
Fixed assets depreciation		(12	)		—
Gross deferred tax liabilities	$	(313	)	$	(594	)
Total deferred tax assets	$	—		$	—

Income taxes are recorded using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income (or loss) in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for the amount of deferred tax assets that, based on available evidence, is not more likely than not to be realized.

Management believes that, based on available evidence, both positive and negative, it is more likely than not that the deferred tax assets will not be utilized, such that a full valuation allowance has been recorded. The valuation allowance for deferred tax assets was $29.9 million, $25.8 million and $23.7 million as of January 31, 2016, 2015 and 2014, respectively. The net change in the total valuation allowance for the year ended January 31, 2016 was an increase of $4.1 million.

On January 31, 2016, the Company had approximately $64.2 million and $55.0 million of net operating loss (NOL) carryforwards available to offset future taxable income for both federal and state purposes, respectively. Of these amounts $0.4 million and $0.4 million represent federal and state tax deductions from stock-based compensation, which will be recorded as an adjustment to additional paid-in capital when they reduce tax payable. If not utilized, these available carryforward losses will expire in various amounts for federal and state tax purposes beginning in 2030.

In addition, the Company had approximately $1.7 million and $1.3 million of federal and state research and development tax credits, respectively, available to offset future taxes. If not utilized, the available federal credits will begin to expire in 2030. California state research and development tax credits can be carried forward indefinitely.

Under Section 382 of the Internal Revenue Code of 1986, as amended, utilization of the NOL carryforwards and credits may be subject to substantial annual limitation due to the ownership change limitations and similar state provisions. If there should be an additional ownership change, the annual limitation may result in the expiration of NOLs and credits before utilization.

The Company completed a Section 382 analysis through January 31, 2016 and determined that an ownership change, as defined under Section 382 of the Internal Revenue Code, occurred in prior years. Based on the analysis, the Company determined that it has undergone three ownership changes. The first and second ownership changes occurred in April 2005 and the third change occurred in February 2009. NOLs presented account for any limited and potential lost attributes due to such ownership changes and their respective expiration dates.

In fiscal 2015, the Company acquired Talkatone, Inc., or Talkatone, a privately held provider of telephony and texting services over Wifi Networks. The Company recorded a tax benefit of $0.5 million arising from the release of deferred tax valuation allowances subsequent to the acquisition of Talkatone. The release of the valuation allowances was triggered by the recognition of $0.5 million of long term net deferred tax liabilities that were primarily related to the acquired intangible assets and R&D credits recorded upon the acquisition of Talkatone.

The Company had unrecognized tax benefits (“UTBs”) of approximately $1.2 million as of January 31, 2016. All of the deferred tax assets associated with these UTBs are fully offset by a valuation allowance. The following table summarizes the activity related to UTBs (in thousands):

Balance at January 31, 2014	$	743
Increase related to prior year positions		59
Increase related to current year tax positions		227
Balance at January 31, 2015		1,029
(Decrease) related to prior year positions		(16	)
Increase related to current year tax positions		204
Balance at January 31, 2016	$	1,217

All of these UTBs, if recognized, would not affect the effective tax rate before consideration of the valuation allowance.

The Company’s policy is to classify interest and penalties associated with unrecognized tax benefits as income tax expense. The Company had no interest or penalty accruals associated with uncertain tax benefits in its balance sheets and statements of operations for both fiscal years 2016 and 2015.

The Company does not have any tax positions for which it is reasonably possible the total amount of gross unrecognized benefits will increase or decrease within 12 months of the year ended January 31, 2016.

Because the Company has net operating loss and credit carryforwards, there are open statutes of limitations in which federal, state and foreign taxing authorities may examine the Company’s tax returns for all years from 2005 through the current period.

Retirement Plan	12 Months Ended
Retirement Plan	Jan. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Retirement Plan	13. RETIREMENT PLAN The Company offers a qualified 401(k) plan to eligible employees. The plan allows for discretionary employer matching and profit-sharing contributions. The plan covers all full-time employees over the age of 21 and provides employees with tax deferred salary deductions. Employees may contribute up to a maximum of $18,000 per year, or $24,000 for employees over 50 years of age, and the Company matches 50% of the contribution of the employee up to 6% of the deferred salary amount. Contributions made by the Company vest 100% upon contribution. The Company expensed $0.3 million, $0.2 million and $0.1 million in the years ended January 31, 2016, 2015 and 2014, respectively.

Commitments and Contingencies

12 Months Ended

Jan. 31, 2016

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

14. COMMITMENTS AND CONTINGENCIES

The Company leases office space for its headquarters in Palo Alto, California under an operating lease, which is due to expire in November 2017. Monthly rent payments on the lease are approximately $40,000.

In January 2015, the Company entered into a capital lease for computer equipment that matures in December 2016 with the right to purchase the equipment at maturity for one dollar.

Minimum rental commitments under all noncancelable leases with an initial term in excess of one year as of January 31, 2016, were as follows (in thousands):

	Capital			Operating
Year Ending January 31,	Leases			Leases
2017	$	653		$	1,802
2018		—			1,421
2019		—			45
Total	$	653		$	3,268
Less: Amount representing interest		(21	)
Present value of lease payments		632
Less: Current portion		(632	)
Capital lease—net of current portion	$	—

Rent expense was $1.2 million, $0.9 million, and $0.6 million for the years ended January 31, 2016, 2015 and 2014, respectively.

In March 2011, the Company entered into a patent license agreement with AT&T Intellectual Property II, L.P. Under the terms of the agreement, the Company is to pay a royalty on a per unit of on-premise appliance sold basis in consideration for the license and release. The royalty is not payable until after 250,000 units are sold. The royalty expense is recorded in cost of revenue, and was not material for any of the periods presented.

Legal Matters—The Company is party to actions and proceedings incident to the Company’s business in the ordinary course of business, including litigation regarding its intellectual property, challenges to the enforceability or validity of its intellectual property, and claims that the Company’s products or services infringe on the intellectual property rights of others. The Company accrues a liability for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. In management’s opinion, there are no contingent liabilities requiring accrual or disclosure as of January 31, 2016.

Indemnification—The Company enters into standard indemnification arrangements in the ordinary course of business. Pursuant to these arrangements, the Company indemnifies, holds harmless, and agrees to reimburse the indemnified parties for losses suffered or incurred by the indemnified party, in connection with any trade secret, copyright, patent or other intellectual property infringement claim by any third party with respect to the Company’s technology. The term of these indemnification agreements is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable because it involves claims that may be made against the Company in the future, but have not yet been made.

The Company has entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company has director and officer insurance coverage that reduces the Company’s exposure and enables the Company to recover a portion of any future amounts paid.

To date the Company has not incurred costs to defend lawsuits or settle claims related to these indemnification agreements. No liability associated with such indemnifications has been recorded to date.

Acquisitions

12 Months Ended

Jan. 31, 2016

Business Combinations [Abstract]

Acquisitions

15. ACQUISITIONS

Talkatone, Inc.—In fiscal 2015, the Company acquired all of the issued and outstanding securities of Talkatone, Inc. (“Talkatone”) a privately held provider of telephony services over Wi-Fi networks in order to expand its service offerings in the mobile application marketplace. The total consideration for this transaction was approximately $2.3 million on the acquisition date and consisted of the following (dollars in thousands):

Cash consideration paid at closing	$	887
Common stock (90,426 shares)		338
Contingent consideration		1,039
Total consideration	$	2,264

At the time of the Talkatone acquisition, the Company was obligated to pay additional amounts for certain deferred earn-out payments based upon the achievement of certain performance targets. The Company determined the fair market value of these earn-outs based on probability analysis. The fair market value and gross amount of these earn-out payments were $1.0 million and $2.2 million, respectively. The fair value measurement is based on significant inputs not observed in the market and thus represents a Level 3 measurement, which reflects the Company’s own assumptions in measuring fair value.

Transaction costs associated with the acquisition were $12,000 and are included in general and administrative expense in the accompanying consolidated statement of operations.

The Company accounted for the Talkatone acquisition under the acquisition method of accounting as a business combination. The assets acquired and liabilities assumed were recorded at fair market value determined by management. The excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired was recorded as goodwill. The goodwill generated from the business combination is primarily related to the employee workforce and the expected synergies. Goodwill is not subject to any amortization and is not tax deductible.

During the fiscal year ended January 31, 2016, the Company paid $0.7 million in cash and issued 49,159 shares as earn-out consideration.

The purchase price was allocated as follows (in thousands):

Cash	$	215
Net liabilities assumed		(60	)
Intangible assets:
Trade name		103
Developed technology		815
Non-compete agreement		118
User relationships		458
Non-current deferred tax liabilities		(502	)
Goodwill		1,117
Net assets acquired	$	2,264

The intangible assets acquired are reported, net of accumulated amortization, in the accompanying consolidated balance sheets as of January 31, 2016 and 2015. Amortization expense related to the acquired intangible assets was $0.4 million and $0.2 million for fiscal 2016 and 2015, respectively, which was included as a component of operating expenses and cost of revenue in the consolidated statement of operations. The operating results of Talkatone have been included in the accompanying consolidated financial statements from the date of acquisition.

Pro forma results of operations for the acquisitions completed have not been presented because the effects of the acquisitions, individually and in the aggregate, were not material to the Company’s financial results.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1524-128463

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Net Loss Per Share

12 Months Ended

Jan. 31, 2016

Earnings Per Share [Abstract]

Net Loss Per Share

16. NET LOSS PER SHARE

Basic and diluted net loss per share of common stock allocable to common stockholders is calculated by dividing the net loss allocable to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net loss per share of common stock is the same as basic net loss per share of common stock, since the effects of potentially dilutive securities are antidilutive. Upon completion of the IPO on July 22, 2015, all outstanding convertible preferred stock was converted to common stock and are included in the weighted average number of common shares used to compute net loss per share from the conversion date.

The following table sets forth the computation of the Company’s basic and diluted net loss per share of common stock (in thousands, except share and per share data):

	Year ended January 31,
	2016			2015			2014
Numerator
Net loss	$	(14,052	)	$	(6,410	)	$	(2,000	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		10,173,095			2,284,241			1,688,846
Basic and diluted net loss per share	$	(1.38	)	$	(2.81	)	$	(1.18	)

The following potentially dilutive securities outstanding have been excluded from the computation of diluted weighted-average shares outstanding because such securities have an antidilutive impact due to losses reported (in common stock equivalent shares):

	Year ended January 31,
	2016		2015		2014
Options to purchase common stock		2,087,584		1,893,239		899,478
Employee stock purchase plan		381,066		—		—
Convertible preferred stock		—		8,353,748		8,333,341
Restricted stock units		1,056,905		—		—
Warrants to purchase convertible preferred stock		—		192,009		217,814
Warrants to purchase common stock		97,931		87,828		34,730
Common stock subject to repurchase		173,404		502,359		739,798
Potential shares excluded from diluted net loss per share		3,796,890		11,029,183		10,225,161

Subsequent Events	12 Months Ended
Subsequent Events	Jan. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	17. SUBSEQUENT EVENTS From February 1, 2016 to April 11, 2016, the Company granted 1,283,050 restricted stock units which vest over four years to officers, employees and non-employees.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Jan. 31, 2016

Accounting Policies [Abstract]

Principles of Consolidation

Fiscal Year End

Use of Estimates

Reverse Stock Split

Initial Public Offering and Conversion of Preferred Stock

Revenue Recognition

The Company recognizes revenue when the following criteria are met:

Persuasive evidence of an arrangement exists.

Delivery has occurred.

Collection of the fees is reasonably assured.

The fee is fixed or determinable.

Subscription and Service Revenue

Subscription and Services Revenue

Product and Other Revenue

Cash Equivalents and Short-term investments

Fair Value of Financial Instruments

Level 1 – Quoted prices in active markets for identical assets or liabilities.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company recognizes transfers among Level 1, Level 2 and Level 3 classifications as of the actual date of the events or change in circumstances that caused the transfers.

Segment Reporting

All of the Company’s long-lived assets were attributable to operations in the United States as of January 31, 2016 and 2015.

Comprehensive Income

Net Loss per Share of Common Stock

Concentration of Credit Risk

	As of January 31,
	2016			2015
Customer A		13	%		11	%
Customer B	*				23	%
Customer C	*				10	%

*	represents less than 10% during the period

Accounts Receivable and Allowance for Returns

Inventories

Deferred Inventory Costs

Website Development Costs

Property and Equipment

Goodwill and Intangible Assets

Impairment of Long-Lived Assets

Convertible Preferred Stock

Convertible Preferred Stock Warrant Liability

Shipping and Handling Costs

Shipping and Handling Costs—Shipping and handling costs are expensed as incurred and are included in cost of product and other revenue.

Research and Development

Deferred Offering Costs

Advertising

Stock-Based Compensation

Income Taxes

Recent Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jan. 31, 2016

Accounting Policies [Abstract]

Concentration of Accounts Receivable

The concentration of accounts receivable was as follows:

	As of January 31,
	2016			2015
Customer A		13	%		11	%
Customer B	*				23	%
Customer C	*				10	%

*	represents less than 10% during the period

Fair Value Measurement (Tables)

12 Months Ended

Jan. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities at Fair Value

The Company’s financial assets and liabilities that are measured at fair value on a recurring basis by level within the fair value hierarchy are as follows (in thousands):

	As of January 31, 2016
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	3,462	$	—	$	—	$	3,462
Commercial paper		—		3,499		—		3,499
Total cash equivalents	$	3,462	$	3,499	$	—	$	6,961
Cash								20,452
Total Cash and cash equivalents							$	27,413

Short-term investments:
Corporate debt securities	$	—	$	7,845	$	—	$	7,845
Commercial paper		—		4,986		—		4,986
U.S. agency securities		—		7,666		—		7,666
U.S. government securities		7,494		—		—		7,494
Total short-term investments	$	7,494	$	20,497	$	—	$	27,991

Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	288	$	288
Total liabilities	$	—	$	—	$	288	$	288

	Balance as of January 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	9,018	$	—	$	—	$	9,018
Total cash equivalents	$	9,018	$	—	$	—	$	9,018
Cash								115
Total Cash and cash equivalents							$	9,133

Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	1,695	$	1,695
Convertible preferred stock warrant liability		—		—		1,217		1,217
Total liabilities	$	—	$	—	$	2,912	$	2,912

Schedule of Changes in Level Three Fair Value Category

	Convertible Preferred Stock Warrant Liability			Acquisition-Related Contingent Consideration
Balance at January 31, 2015	$	1,217		$	1,695
Payout of consideration		—			(675	)
Issuance of shares		—			(451	)
Changes in fair value		442			(281	)
Payment of preferred warrant liability upon IPO		(584	)		—
De-recognition of preferred warrant liability to additional paid-in capital		(1,075	)		—
Balance at January 31, 2016	$	—		$	288

Short-term Investments (Tables) - Short-term Investments [Member]

12 Months Ended

Jan. 31, 2016

Schedule Of Available For Sale Securities [Line Items]

Summary of Short-term Investments

Short-term investments consisted of the following (in thousands):

	As of January 31, 2016
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	7,851	$	(6	)	$	—	$	7,845
Commercial paper		4,985					1		4,986
U.S. agency securities		7,661					5		7,666
U.S. government securities		7,477					17		7,494
Total short-term investments	$	27,974	$	(6	)	$	23	$	27,991

Schedule of Cost Basis and Fair Value of Short-term Investments by Contractual Maturity

The cost basis and fair value of the short-term investments by contractual maturity consist of the following (in thousands):

	As of January 31, 2016
	Amortized Value		Fair Value
One year or less	$	19,143	$	19,145
Over one year and less than two years		8,831		8,846
Total	$	27,974	$	27,991

Schedule of Investments in Unrealized Loss Position

Investments in an unrealized loss position consisted of the following (in thousands):

	As of January 31, 2016
	Fair Value		Unrealized Losses
Corporate debt securities	$	7,845	$	(6	)

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Goodwill and Intangible Assets (Tables)

12 Months Ended

Jan. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Carrying Value of Intangible Assets Other than Goodwill

The carrying values of intangible assets other than goodwill are as follows (in thousands):

		As of January 31, 2016							As of January 31, 2015
	Estimated Life (in years)	Gross Value		Accumulated Amortization			Net Carrying Amount		Gross Value		Accumulated Amortization			Net Carrying Amount
Developed technology	5	$	815	$	(285	)	$	530	$	815	$	(123	)	$	692
User relationships	3.5		458		(229	)		229		458		(98	)		360
Trade name	5		103		(36	)		67		103		(16	)		87
Non-compete agreement	2		118		(104	)		14		118		(44	)		74
Patents and licenses	3.8-7		714		(669	)		45		714		(649	)		65
Total		$	2,208	$	(1,323	)	$	885	$	2,208	$	(930	)	$	1,278

Schedule of Estimated Amortization Expense

At January 31, 2016 the estimated amortization expense related to the intangible assets is as follows (in thousands):

Years Ending January 31,
2017	$	349
2018		291
2019		190
2020		52
2021 and thereafter		3
Total	$	885

Balance Sheet Components (Tables)

12 Months Ended

Jan. 31, 2016

Balance Sheet Components [Abstract]

Components of Inventories

Inventories consist of the following (in thousands):

	As of January 31,
	2016		2015
Finished goods	$	4,633	$	5,719
Raw material		378		2,362
Total inventory	$	5,011	$	8,081

Components of Deferred Revenue

Deferred revenue, consists of the following (in thousands):

	As of January 31,
	2016		2015
Deferred revenue:
Subscription and services	$	11,954	$	9,860
Product and other		3,118		4,523
Total deferred revenue		15,072		14,383
Less: current portion of deferred revenue		15,036		14,348
Deferred revenue, noncurrent portion included in other long-term liabilities	$	36	$	35

Components of Property and Equipment, Net

Property and equipment, net consists of the following (in thousands):

		As of January 31,
	Estimated Life (in years)	2016			2015
Software and computer equipment	3-4	$	6,615		$	4,963
Website development costs	2		1,675			1,216
Machinery and equipment	3		1,207			644
Office furniture and fixtures	5		57			52
Leasehold improvements	shorter of estimated life of asset or remaining lease term		372			251
Total property and equipment		$	9,926		$	7,126
Less: accumulated depreciation and amortization			(5,635	)		(4,233	)
Property and equipment, net		$	4,291		$	2,893

Components of Accrued Expenses

Accrued expenses consist of the following (in thousands):

	As of January 31,
	2016		2015
Accrued regulatory fees and taxes	$	5,216	$	4,762
Accrued payroll and related expenses		3,559		2,022
Acquisition-related contingent consideration-current portion		288		1,027
Other accrued expenses		3,947		2,502
Total accrued expenses	$	13,010	$	10,313

Debt (Tables)

12 Months Ended

Jan. 31, 2016

Debt Disclosure [Abstract]

Schedule of Aggregate Debt Outstanding

The aggregate debt outstanding at each balance sheet date was as follows (in thousands):

	Term Debt			Capital Lease Obligations		Total
Debt as of January 31, 2016	$	—		$	632	$	632
Less: unamortized discounts and issuance costs		—			—		—
Net carrying value of debt		—			632		632
Less: short-term debt and capital lease obligations		—			632		632
Long-term debt and capital lease obligations	$	—		$	—	$	—

Debt as of January 31, 2015	$	11,058		$	1,298	$	12,356
Less: unamortized discounts and issuance costs		(396	)		—		(396	)
Net carrying value of debt		10,662			1,298		11,960
Less: short-term debt and capital lease obligations		896			666		1,562
Long-term debt and capital lease obligations	$	9,766		$	632	$	10,398

Convertible Preferred Stock Warrant Liability (Tables)

12 Months Ended

Jan. 31, 2016

Summary of Warrants to Purchase Convertible Preferred Stock Outstanding

A summary of the Company’s common stock warrants activity is as follows:

	Common Warrants Outstanding
Balance as of January 31, 2015		87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO		87,325
Less: Common warrants exercised to common stock		(30,573	)
Less: Common warrants terminated		(46,649	)
Balance as of January 31, 2016		97,931

Stock Options Valuation Assumptions Used to Calculate the Fair Value of Warrants

The following assumptions were used to calculate the fair value of the warrants:

	For the period ended	For the year ended January 31,
	July 22, 2015	2015		2014
Assumptions:
Expected volatility	66%-70%		70%		70%
Expected term (in years)	0-1.1	1.3-1.4		0.1-2.4
Risk-free interest rate	0%-0.3%		0.3%	0.3%-0.5%

Dividend yield	—%	—%		—%

Convertible Preferred Stock

Summary of Warrants to Purchase Convertible Preferred Stock Outstanding

At each balance sheet date, the Company had the following warrants to purchase convertible preferred stock outstanding:

			Fair value				Fair value
	Warrants		of Warrants		Warrants		of Warrants
	outstanding		Liabilities as of		outstanding		Liabilities as of
	as of		January 31, 2015		as of		January 31, 2016
	January 31, 2015		(in thousands)		January 31, 2016		(in thousands)
December 2010 warrant		70,287	$	474		—	$	—
April 2012, December 2012 and October 2014 warrants		66,026		374		—		—
May and June 2009 warrants		55,696		369		—		—
Total		192,009	$	1,217		—	$	—

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References + Details

Common Stock and Preferred Stock (Tables)

12 Months Ended

Jan. 31, 2016

Equity [Abstract]

Summary of Convertible Preferred Stock Outstanding

Prior to the closing of the Company's IPO on July 22, 2015 and as of January 31, 2015, the Company had the following convertible preferred stock outstanding:

	As of July 22, 2015								As of January 31, 2015
	Shares authorized		Shares issued and outstanding		Aggregate liquidation preference		Carrying value		Shares authorized		Shares issued and outstanding		Aggregate liquidation preference		Carrying value
					(in thousands)								(in thousands)
Convertible preferred series Alpha		8,060,629		7,868,605	$	36,943	$	30,632		8,125,000		7,868,605	$	36,943	$	30,632
Convertible preferred series Alpha-1		485,146		485,143		19,490		3,005		583,333		485,143		19,490		3,005
Convertible preferred series Beta		471,635		241,469		5,120		5,000		—		—		—		—
Total convertible preferred stock		9,017,410		8,595,217	$	61,553	$	38,637		8,708,333		8,353,748	$	56,433	$	33,637

Schedule of Common Stock Reserved for Issuance

The Company had shares of common stock reserved for issuance as follows:

	Year ended January 31,
	2016		2015
Conversion of Series Alpha preferred stock		—		7,868,605
Conversion of Series Alpha-1 preferred stock		—		485,143
Total conversion of preferred stock		—		8,353,748

Warrants to purchase Series Alpha preferred stock		—		192,009
Warrants to purchase common stock		97,931		87,828
Options to purchase common stock outstanding		2,087,584		1,893,239
Options available for future grant under stock option plan		1,254,404		133,029
Shares reserved under Employee Stock Purchase Plan		425,596		—
Restricted stock units outstanding		1,056,905		—
Total shares reserved for issuance		4,922,420		10,659,853

Stockholders' Equity (Tables)

12 Months Ended

Jan. 31, 2016

Equity [Abstract]

Summary of Stock Option Activity

Summary of the Company’s stock option activity is as follows:

	Number of			Weighted Average		Weighted Average		Aggregate
	Options			Exercise Price		Contractual Term		Intrinsic Value
	Outstanding			Per Share		(in Years)		(in thousands)
Balance as of January 31, 2015		1,893,239		$	3.85		8.4	$	10,109
Options granted		427,948		$	12.55
Options exercised		(83,229	)	$	0.79
Options canceled		(150,374	)	$	6.16
Balance as of January 31, 2016		2,087,584		$	5.59		7.9	$	4,843
Vested and exercisable - January 31, 2016		706,322		$	1.90		5.7	$	3,682
Vested and expected to vest - January 31, 2016		2,005,813		$	5.50		7.8	$	4,779

Summary of Restricted Stock Units Activity

A summary of the Company’s RSU activity and related information for year ended January 31, 2016 is as follows:

	Number of Shares			WeightedAverage Grant-Date Fair Value Per Share		WeightedAverage Remaining Vesting Period (Years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2015		—		$	—		—	$	—
RSUs granted		1,157,105			9.62
RSUs vested		—			—
RSUs canceled		(100,200	)		9.74
Balance as of January 31, 2016		1,056,905		$	9.60		1.43	$	7,176

Summary of Warrants to Purchase Convertible Preferred Stock Outstanding

A summary of the Company’s common stock warrants activity is as follows:

	Common Warrants Outstanding
Balance as of January 31, 2015		87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO		87,325
Less: Common warrants exercised to common stock		(30,573	)
Less: Common warrants terminated		(46,649	)
Balance as of January 31, 2016		97,931

- Definition

+ References + Details

Stock-Based Compensation (Tables)

12 Months Ended

Jan. 31, 2016

Total Stock-Based Compensation Recognized for Stock-Based Awards in Condensed Consolidated Statements of Operations

The total stock-based compensation the Company recognized for stock-based awards in the consolidated statements of operations is as follows (in thousands):

	Year ended January 31,
	2016		2015		2014
Total cost of revenue	$	437	$	36	$	7
Sales and marketing		611		41		6
Research and development		1,683		169		26
General and administrative		1,922		180		33
Total stock-based compensation expense	$	4,653	$	426	$	72

Stock-Based Compensation Expense by Award Type

The following table presents stock-based compensation expense by award-type (in thousands):

	Year ended January 31,
	2016		2015		2014
Stock options	$	2,607	$	426	$	72
Restricted stock units		1,644		—		—
Employee stock purchase plan		402		—		—
Total stock-based compensation expense	$	4,653	$	426	$	72

Stock Options Valuation Assumptions Used to Calculate the Fair Value of Warrants

The following assumptions were used to calculate the fair value of the warrants:

	For the period ended	For the year ended January 31,
	July 22, 2015	2015		2014
Assumptions:
Expected volatility	66%-70%		70%		70%
Expected term (in years)	0-1.1	1.3-1.4		0.1-2.4
Risk-free interest rate	0%-0.3%		0.3%	0.3%-0.5%

Dividend yield	—%	—%		—%

ESPP

Stock Options Valuation Assumptions Used to Calculate the Fair Value of Warrants

The grant date fair value of the ESPP was estimated using the following assumptions:

						For the year ended January 31,
						2016
ESPP:
Expected volatility						35%-44%
Expected term (in years)						0.5-2.2
Risk-free interest rate						0.1%-0.8%
Dividend yield						—%

Employee Stock Option

Stock Options Valuation Assumptions Used to Calculate the Fair Value of Warrants

For the years ended January 31, 2016, 2015 and 2014 the calculated fair value of employee stock options grants was estimated using the Black – Scholes model with the following assumptions:

	Year ended January 31,
	2016	2015	2014
Stock Options:
Expected volatility	54%-62%	69%-81%	77% - 79%
Expected term (in years)	5.3-6.1	5.4-6.3	5.1-6.3
Risk-free interest rate	1.6%-1.9%	1.5%-2.0%	0.8%-2.2%
Dividend yield	—%	—%	—%

Income Taxes (Tables)

12 Months Ended

Jan. 31, 2016

Income Tax Disclosure [Abstract]

Reconciliation of Income Tax Expense

Income tax expense differed from the amount computed by applying the federal statutory income tax rate of 34% to pretax loss as a result of the following (in thousands):

	Year ended January 31,
	2016			Rate			2015			Rate			2014			Rate
Federal tax at statutory rate	$	(4,787	)		34	%	$	(2,350	)		34	%	$	(680	)		34	%
Change in valuation allowance		4,502			(32	)%		2,132			(31	)%		831			(42	)%
State taxes		(261	)		2	%		(437	)		6	%		(156	)		8	%
Stock-based compensation		691			(5	)%		92			(1	)%		14			(1	)%
Research and development credit		(273	)		2	%		(192	)		3	%		(131	)		7	%
Permanent tax adjustment		128			(1	)%		23			—			104			(5	)%
Other		—			—			230			(3	)%		18			(1	)%
Total	$	—			—		$	(502	)		8	%	$	—			—

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and liabilities related to the following (in thousands):

	As of January 31,
	2016			2015
Deferred tax assets:
Accruals and reserves	$	2,297		$	2,036
Stock-based compensation		1,334			436
Intangible assets amortization		110			243
Deferred revenue		13			15
Fixed assets depreciation		—			168
Net operating loss carry forwards		24,869			22,240
Tax credit carryover		1,558			1,241
Gross deferred tax assets		30,181			26,379
Valuation allowance		(29,868	)		(25,785	)
Net deferred tax assets	$	313		$	594
Deferred tax liabilities:
Acquired intangible assets	$	(301	)	$	(594	)
Fixed assets depreciation		(12	)		—
Gross deferred tax liabilities	$	(313	)	$	(594	)
Total deferred tax assets	$	—		$	—

Summary of Activity Related to UTBs

The following table summarizes the activity related to UTBs (in thousands):

Balance at January 31, 2014	$	743
Increase related to prior year positions		59
Increase related to current year tax positions		227
Balance at January 31, 2015		1,029
(Decrease) related to prior year positions		(16	)
Increase related to current year tax positions		204
Balance at January 31, 2016	$	1,217

Commitments and Contingencies (Table)

12 Months Ended

Jan. 31, 2016

Commitments And Contingencies Disclosure [Abstract]

Minimum Rental Commitments under Noncancelable Leases

Minimum rental commitments under all noncancelable leases with an initial term in excess of one year as of January 31, 2016, were as follows (in thousands):

	Capital			Operating
Year Ending January 31,	Leases			Leases
2017	$	653		$	1,802
2018		—			1,421
2019		—			45
Total	$	653		$	3,268
Less: Amount representing interest		(21	)
Present value of lease payments		632
Less: Current portion		(632	)
Capital lease—net of current portion	$	—

Acquisitions (Tables)

12 Months Ended

Jan. 31, 2016

Business Combinations [Abstract]

Components of Total Consideration

The total consideration for this transaction was approximately $2.3 million on the acquisition date and consisted of the following (dollars in thousands):

Cash consideration paid at closing	$	887
Common stock (90,426 shares)		338
Contingent consideration		1,039
Total consideration	$	2,264

Schedule of Purchase Price Allocation

The purchase price was allocated as follows (in thousands):

Cash	$	215
Net liabilities assumed		(60	)
Intangible assets:
Trade name		103
Developed technology		815
Non-compete agreement		118
User relationships		458
Non-current deferred tax liabilities		(502	)
Goodwill		1,117
Net assets acquired	$	2,264

Net Loss Per Share (Tables)

12 Months Ended

Jan. 31, 2016

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss Per Share of Common Stock

The following table sets forth the computation of the Company’s basic and diluted net loss per share of common stock (in thousands, except share and per share data):

	Year ended January 31,
	2016			2015			2014
Numerator
Net loss	$	(14,052	)	$	(6,410	)	$	(2,000	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		10,173,095			2,284,241			1,688,846
Basic and diluted net loss per share	$	(1.38	)	$	(2.81	)	$	(1.18	)

Potential Dilutive Securities Outstanding of Common Stock Excluded from Diluted Weighted-Average Common Shares Outstanding

	Year ended January 31,
	2016		2015		2014
Options to purchase common stock		2,087,584		1,893,239		899,478
Employee stock purchase plan		381,066		—		—
Convertible preferred stock		—		8,353,748		8,333,341
Restricted stock units		1,056,905		—		—
Warrants to purchase convertible preferred stock		—		192,009		217,814
Warrants to purchase common stock		97,931		87,828		34,730
Common stock subject to repurchase		173,404		502,359		739,798
Potential shares excluded from diluted net loss per share		3,796,890		11,029,183		10,225,161

Description of Business - Additional Information (Details)	12 Months Ended
	Jan. 31, 2016
Accounting Policies [Abstract]
Date of Incorporation of Company	Nov. 19, 2003

Summary of Significant Accounting Policies - Additional Information (Details)		1 Months Ended		12 Months Ended
	Jul. 06, 2015	Jul. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2010 USD ($) $ / shares shares	Jan. 31, 2016 USD ($) Segment Customer $ / shares shares	Jan. 31, 2015 USD ($) Customer $ / shares shares	Jan. 31, 2014 USD ($)	Jul. 22, 2015 $ / shares shares	Jun. 30, 2009 shares	May 31, 2009 shares
Summary Of Significant Accounting Policies [Line Items]
Reverse stock split ratio	0.5
Common stock, shares issued		2,612		16,916,250	2,515,065
Public offering price \| $ / shares		$ 13.00	$ 13.00
Number of preferred stock converted		13,752
Common stock issued for conversion of preferred stock		6,542
Convertible preferred stock warrant liability settled \| $			$ 600,000	$ 600,000
Warrant to purchase convertible preferred stock			70,287		76,630			34,397	21,299
Exercise price per share of warrants \| $ / shares		$ 4.70	$ 4.70		$ 6.04
Warrant exercised		21,529
Class of warrants or rights termination		556
Warrants issued		66,026
Common warrants were cash exercised		6,542
Reportable segments \| Segment				1
Unrealized gains, net \| $				$ 17,000
Net of allowance of returns \| $				0	$ 200,000
Goodwill \| $				1,117,000	1,117,000
Impairment of long-lived assets \| $				0	0	$ 0
Deferred offering costs capitalized \| $					500,000
Advertising costs \| $				500,000	800,000	600,000
Sales and marketing
Summary Of Significant Accounting Policies [Line Items]
Advertising costs \| $				13,900,000	14,800,000	$ 8,900,000
Talkatone
Summary Of Significant Accounting Policies [Line Items]
Goodwill \| $					1,100,000
Impairment on goodwill \| $				$ 0
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment				3 years
Minimum \| Talkatone
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived intangible assets remaining amortization period				1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment				5 years
Maximum \| Talkatone
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived intangible assets remaining amortization period				7 years
Website Development Costs
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment				2 years
Development costs capitalized \| $				$ 500,000	$ 500,000
Customer Concentration Risk \| Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of customers \| Customer				1	3
Common Stock
Summary Of Significant Accounting Policies [Line Items]
Warrant to purchase convertible preferred stock		87,828							21,299
Common warrants were exercised		4,100
Convertible Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Warrant to purchase convertible preferred stock		2,769					2,769	34,397	21,299
Class of warrants or rights termination		10,099
Initial Public Offering
Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued		5,000,000		5,000,000
Public offering price \| $ / shares		$ 13.00		$ 13.00			$ 13.00
Net proceeds from issuance of common stock \| $		$ 56,900,000
Underwriters discounts and commissions related to stock issuance \| $		4,500,000
Offering cost related to stock issuance \| $		$ 3,600,000
Common stock issued for conversion of preferred stock		525,109
Percentage of guaranteed conversion price		75.00%
Convertible preferred stock adjusted conversion price \| $ / shares		$ 9.75
Warrant to purchase convertible preferred stock							21,529
Exercise price per share of warrants \| $ / shares							$ 4.70
Initial Public Offering \| Common Stock
Summary Of Significant Accounting Policies [Line Items]
Warrant to purchase convertible preferred stock							13,752
Initial Public Offering \| Series Alpha preferred stock and Series Alpha -1 preferred stock
Summary Of Significant Accounting Policies [Line Items]
Public offering price \| $ / shares		$ 13.00
Number of preferred stock converted		8,353,748
Initial Public Offering \| Series Alpha-1
Summary Of Significant Accounting Policies [Line Items]
Common stock issued for conversion of preferred stock		8,353,748
Initial Public Offering \| Series Beta Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Number of preferred stock converted		241,469
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 21.2028
Initial Public Offering \| Convertible Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock conversion ratio		1

Summary of Significant Accounting Policies - Concentration of Accounts Receivable (Details) - Accounts Receivable - Customer Concentration Risk	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Customer A
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	11.00%
Customer B
Concentration Risk [Line Items]
Concentration risk percentage		23.00%
Customer C
Concentration Risk [Line Items]
Concentration risk percentage		10.00%

Fair Value Measurement - Schedule of Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Assets:
Total Cash and cash equivalents	$ 27,413	$ 9,133
Total short-term investments	27,991
Liabilities:
Total liabilities	288	2,912
Corporate Debt Securities
Assets:
Total short-term investments	7,845
U.S. Agency Securities
Assets:
Total short-term investments	7,666
U.S. Government Securities
Assets:
Total short-term investments	7,494
Commercial Paper
Assets:
Total short-term investments	4,986
Cash Equivalents
Assets:
Total Cash and cash equivalents	6,961	9,018
Cash Equivalents \| Money Market Funds
Assets:
Total Cash and cash equivalents	3,462	9,018
Cash Equivalents \| Commercial Paper
Assets:
Total Cash and cash equivalents	3,499
Cash
Assets:
Total Cash and cash equivalents	20,452	115
Acquisition-Related Contingent Consideration
Liabilities:
Total liabilities	288	1,695
Convertible Preferred Stock Warrant Liability
Liabilities:
Total liabilities		1,217
Level 1
Assets:
Total short-term investments	7,494
Level 1 \| U.S. Government Securities
Assets:
Total short-term investments	7,494
Level 1 \| Cash Equivalents
Assets:
Total Cash and cash equivalents	3,462	9,018
Level 1 \| Cash Equivalents \| Money Market Funds
Assets:
Total Cash and cash equivalents	3,462	9,018
Level 2
Assets:
Total short-term investments	20,497
Level 2 \| Corporate Debt Securities
Assets:
Total short-term investments	7,845
Level 2 \| U.S. Agency Securities
Assets:
Total short-term investments	7,666
Level 2 \| Commercial Paper
Assets:
Total short-term investments	4,986
Level 2 \| Cash Equivalents
Assets:
Total Cash and cash equivalents	3,499
Level 2 \| Cash Equivalents \| Commercial Paper
Assets:
Total Cash and cash equivalents	3,499
Level 3
Liabilities:
Total liabilities	288	2,912
Level 3 \| Acquisition-Related Contingent Consideration
Liabilities:
Total liabilities	$ 288	1,695
Level 3 \| Convertible Preferred Stock Warrant Liability
Liabilities:
Total liabilities		$ 1,217

Fair Value Measurement - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jul. 31, 2015	Jul. 22, 2015	Oct. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	Dec. 31, 2010
Fair Value Disclosures [Line Items]
Transfers into or out of the level 3 category	$ 0	$ 0
Acquisition-related contingent consideration reduction in expense	$ (281,000)	$ 656,000
Exercise price per share of warrants		$ 6.04	$ 4.70					$ 4.70
Series Alpha Convertible Preferred Stock
Fair Value Disclosures [Line Items]
Exercise price per share of warrants	$ 4.70				$ 4.70	$ 4.70	$ 4.70	$ 4.70
Initial Public Offering
Fair Value Disclosures [Line Items]
Exercise price per share of warrants				$ 4.70
Initial Public Offering \| Series Alpha Convertible Preferred Stock
Fair Value Disclosures [Line Items]
Initial public offering warrant to purchase, shares	70,287
Exercise price per share of warrants	$ 13.00
Warrants exercise price	$ 4.70
Total warrant liabilities	$ 600,000

Fair Value Measurement - Schedule of Changes in Level Three Fair Value Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	$ 2,912
Payout of consideration	281	$ (656)
Issuance of shares	(451)	(338)
De-recognition of preferred warrant liability to additional paid-in capital	(1,075)
Ending Balance	288	2,912
Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,217
Ending Balance		1,217
Acquisition-Related Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,695
Ending Balance	288	1,695
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	2,912
Ending Balance	288	2,912
Level 3 \| Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,217
Changes in fair value	442
Payment of preferred warrant liability upon IPO	(584)
De-recognition of preferred warrant liability to additional paid-in capital	(1,075)
Ending Balance		1,217
Level 3 \| Acquisition-Related Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,695
Payout of consideration	(675)
Issuance of shares	(451)
Changes in fair value	(281)
Ending Balance	$ 288	$ 1,695

Short-term Investments - Summary of Short-term Investment (Details) - Short-term Investments [Member] $ in Thousands	Jan. 31, 2016 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	$ 27,974
Short-term Investments, Unrealized Losses	(6)
Short-term Investments, Unrealized Gains	23
Short-term Investments, Fair Value	27,991
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	7,851
Short-term Investments, Unrealized Losses	(6)
Short-term Investments, Fair Value	7,845
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	4,985
Short-term Investments, Unrealized Gains	1
Short-term Investments, Fair Value	4,986
U.S. Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	7,661
Short-term Investments, Unrealized Gains	5
Short-term Investments, Fair Value	7,666
US Government Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	7,477
Short-term Investments, Unrealized Gains	17
Short-term Investments, Fair Value	$ 7,494

Short-term Investments - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, gross realized gain (losses)	$ 0	$ 0	$ 0

Short-term Investments - Schedule of Cost Basis and Fair Value of Short-term Investments by Contractual Maturity (Details) - Short-term Investments [Member] $ in Thousands	Jan. 31, 2016 USD ($)
Schedule Of Available For Sale Securities [Line Items]
One year or less, amortized cost	$ 19,143
Over one year and less than two years, amortized cost	8,831
Short-term Investments, Amortized Cost	27,974
One year or less, fair value	19,145
Over one year and less than two years, fair value	8,846
Short-term Investments, Fair Value	$ 27,991

Short-term Investments - Schedule of Investments in Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2016 USD ($)
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Total short-term investments	$ 27,991
Corporate Debt Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Total short-term investments	7,845
Investments, Unrealized Losses	$ (6)

Goodwill and Intangible Assets - Additional Information (Details) - Talkatone, Inc. $ in Millions	12 Months Ended
	Jan. 31, 2015 USD ($)
Finite Lived Intangible Assets [Line Items]
Intangible assets recognized from acquisition	$ 1.5
Goodwill recognized from acquisition	$ 1.1

Goodwill and Intangible Assets - Summary of Carrying Values of Intangible Assets Other than Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 2,208	$ 2,208
Accumulated Amortization	(1,323)	(930)
Net Carrying Amount	885	1,278
Developed technology
Finite Lived Intangible Assets [Line Items]
Gross Value	815	815
Accumulated Amortization	(285)	(123)
Net Carrying Amount	$ 530	692
Estimated Life (in years)	5 years
User relationships
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 458	458
Accumulated Amortization	(229)	(98)
Net Carrying Amount	$ 229	360
Estimated Life (in years)	3 years 6 months
Trade name
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 103	103
Accumulated Amortization	(36)	(16)
Net Carrying Amount	$ 67	87
Estimated Life (in years)	5 years
Non-compete agreement
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 118	118
Accumulated Amortization	(104)	(44)
Net Carrying Amount	$ 14	74
Estimated Life (in years)	2 years
Patents and licenses
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 714	714
Accumulated Amortization	(669)	(649)
Net Carrying Amount	$ 45	$ 65
Patents and licenses \| Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Life (in years)	3 years 9 months 18 days
Patents and licenses \| Maximum
Finite Lived Intangible Assets [Line Items]
Estimated Life (in years)	7 years

Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense Related to Intangible Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
2017	$ 349
2018	291
2019	190
2020	52
2021 and thereafter	3
Total	$ 885	$ 1,278

Balance Sheet Components - Components of Inventories (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Inventory Disclosure [Abstract]
Finished goods	$ 4,633	$ 5,719
Raw material	378	2,362
Total inventory	$ 5,011	$ 8,081

Balance Sheet Components - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 15,072	$ 14,383
Less: current portion of deferred revenue	15,036	14,348
Deferred revenue, noncurrent portion included in other long-term liabilities	36	35
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	11,954	9,860
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 3,118	$ 4,523

Balance Sheet Components - Components of Property And Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Property Plant And Equipment [Line Items]
Total property and equipment	$ 9,926	$ 7,126
Less: accumulated depreciation and amortization	(5,635)	(4,233)
Property and equipment, net	$ 4,291	2,893
Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	3 years
Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	5 years
Software and Computer Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	$ 6,615	4,963
Software and Computer Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	3 years
Software and Computer Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	4 years
Website Development Costs
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	2 years
Total property and equipment	$ 1,675	1,216
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	3 years
Total property and equipment	$ 1,207	644
Office Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	5 years
Total property and equipment	$ 57	52
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	shorter of estimated life of asset or remaining lease term
Total property and equipment	$ 372	$ 251

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 1,410	$ 896	$ 787
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment under capital lease agreement	1,500	1,500
Accumulated depreciation of property and equipment under capital lease agreement	$ 500	$ 200

Balance Sheet Components - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Payables And Accruals [Abstract]
Accrued regulatory fees and taxes	$ 5,216	$ 4,762
Accrued payroll and related expenses	3,559	2,022
Acquisition-related contingent consideration-current portion	288	1,027
Other accrued expenses	3,947	2,502
Total accrued expenses	$ 13,010	$ 10,313

Debt - Additional Information (Details) - USD ($)	1 Months Ended				6 Months Ended	12 Months Ended
Debt - Additional Information (Details) - USD ($)	Jul. 31, 2015	Jan. 31, 2015	Jul. 31, 2014	Dec. 31, 2012	Jul. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014	Oct. 31, 2014	Apr. 30, 2012	Dec. 31, 2010	Jun. 30, 2009	May 31, 2009
Debt Instrument [Line Items]
Warrant to purchase convertible preferred stock		76,630					76,630				70,287	34,397	21,299
Exercise price per share of warrants	$ 4.70	$ 6.04			$ 4.70		$ 6.04				$ 4.70
Warrants, exercisable date		2025-01
Interest expense						$ 900,000	$ 300,000	$ 300,000
Amortization of debt issuance costs						100,000	100,000	$ 100,000
Write-off of non-cash deferred debt issuance costs						332,000
Outstanding debt on equipment acquired under capital lease		$ 1,562,000				$ 632,000	1,562,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity period				2014-12
Revolving credit line		12,000,000		$ 6,000,000			12,000,000
Interest rate				2.75%
Interest rate						3.50%
Borrowing under the revolving line of credit facility									$ 5,000,000
Repayment of outstanding debt	$ 5,000,000
Line of credit facility, current borrowing capacity						$ 12,000,000
Revolving Credit Facility \| 2014 Amended Agreement
Debt Instrument [Line Items]
Debt instrument, maturity period			2016-07
Term Debt
Debt Instrument [Line Items]
Outstanding debt on equipment acquired under capital lease		896,000					896,000
Term Debt \| Secured Debt Agreement
Debt Instrument [Line Items]
Term loan										$ 4,000,000
Term loan fixed interest rate										5.75%
Debt instrument, maturity period					2015-09
Repayment of remaining balance	$ 300,000				$ 300,000
New Line Of Credit
Debt Instrument [Line Items]
Revolving credit line		10,000,000					10,000,000
Line of credit facility, current borrowing capacity		$ 5,000,000					$ 5,000,000
Interest rate during period		11.00%					11.00%
Credit facility, maturity date		Jan. 05, 2018
Line of credit, covenant terms						The Company’s credit agreements with its lender contain customary negative covenants that limit the ability to, among other things, incur additional indebtedness, grant liens, make investments, repurchase stock, pay dividends, transfer assets and merge or consolidate.

Schedule of Aggregate Debt Outstanding (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Debt Instrument [Line Items]
Debt outstanding	$ 632	$ 12,356
Less: unamortized discounts and issuance costs		(396)
Net carrying value of debt	632	11,960
Short-term capital lease and debt	632	1,562
Long-term debt		10,398
Term Debt
Debt Instrument [Line Items]
Debt outstanding		11,058
Less: unamortized discounts and issuance costs		(396)
Net carrying value of debt		10,662
Short-term capital lease and debt		896
Long-term debt		9,766
Capital Lease Obligations
Debt Instrument [Line Items]
Debt outstanding	632	1,298
Net carrying value of debt	632	1,298
Short-term capital lease and debt	$ 632	666
Long-term debt		$ 632

Convertible Preferred Stock Warrant Liability - Summary of Warrants to Purchase Convertible Preferred Stock Outstanding (Details) $ in Thousands	Jan. 31, 2015 USD ($) shares
Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Warrants to purchase convertible preferred stock outstanding \| shares	192,009
Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding \| $	$ 1,217
December 2010 warrant \| Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Warrants to purchase convertible preferred stock outstanding \| shares	70,287
December 2010 warrant \| Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding \| $	$ 474
April 2012, December 2012 and October 2014 warrants \| Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Warrants to purchase convertible preferred stock outstanding \| shares	66,026
April 2012, December 2012 and October 2014 warrants \| Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding \| $	$ 374
May and June 2009 warrants \| Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Warrants to purchase convertible preferred stock outstanding \| shares	55,696
May and June 2009 warrants \| Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding \| $	$ 369

Convertible Preferred Stock Warrant Liability - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended				3 Months Ended	12 Months Ended
	Jul. 22, 2015	Oct. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	May 31, 2009	Jan. 31, 2016	Jan. 31, 2016	Jan. 31, 2015	Jul. 31, 2015	Dec. 31, 2010	Jun. 30, 2009
Class Of Stock [Line Items]
Exercise price per share of warrants								$ 6.04	$ 4.70	$ 4.70
Payment for warrant holders							$ 0.6
Public offering price									$ 13.00	$ 13.00
Aggregate liability	$ 0.4
Warrant to purchase convertible preferred stock					21,299			76,630		70,287	34,397
Warrants terminated	10,099
Gain on termination of warrants	$ 0.1
Common Stock
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock					21,299				87,828
December 2010 warrant
Class Of Stock [Line Items]
Remeasurement loss from change in fair value of warrants							0.1	$ 0.3
May and June 2009 warrants
Class Of Stock [Line Items]
Remeasurement loss from change in fair value of warrants							$ 0.1	0.3
May and June 2009 warrants \| Common Stock
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	2,769
Initial Public Offering
Class Of Stock [Line Items]
Exercise price per share of warrants	$ 4.70
Public offering price	$ 13.00					$ 13.00	$ 13.00		$ 13.00
Warrant to purchase convertible preferred stock	21,529
Warrants terminated	10,099
Warrants issued					21,299
Initial Public Offering \| Common Stock
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	13,752
Series Alpha Convertible Preferred Stock
Class Of Stock [Line Items]
Warrants to purchase convertible preferred stock outstanding										70,287
Exercise price per share of warrants		$ 4.70	$ 4.70	$ 4.70		$ 4.70	$ 4.70			$ 4.70
Warrants issued to purchase convertible preferred stock		66,026	66,026	66,026
Aggregate liability	$ 0.7
Warrant conversion ratio	100.00%
Conversion of warrants to common stock						21,421
Warrants exercised, net						66,026
Series Alpha Convertible Preferred Stock \| Minimum
Class Of Stock [Line Items]
Warrant expiry period							2022-04
Series Alpha Convertible Preferred Stock \| Maximum
Class Of Stock [Line Items]
Warrant expiry period							2022-12
Series Alpha Convertible Preferred Stock \| April 2012, December 2012 and October 2014 warrants
Class Of Stock [Line Items]
Remeasurement loss from change in fair value of warrants							$ 0.3	$ 0.2
Series Alpha Convertible Preferred Stock \| Initial Public Offering
Class Of Stock [Line Items]
Exercise price per share of warrants						$ 13.00	$ 13.00
Convertible Preferred Stock
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	2,769				21,299				2,769		34,397

Convertible Preferred Stock Warrant Liability - Assumptions Used to Estimate Fair Value of Each Stock Option (Details)		12 Months Ended
	Jul. 22, 2015	Jan. 31, 2015	Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility		70.00%	70.00%
Expected volatility, minimum	66.00%
Expected volatility, maximum	70.00%
Risk-free interest rate		0.30%
Risk-free interest rate, minimum	0.00%		0.30%
Risk-free interest rate, maximum	0.30%		0.50%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	0 years	1 year 3 months 18 days	1 month 6 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	1 year 1 month 6 days	1 year 4 months 24 days	2 years 4 months 24 days

Common Stock and Preferred Stock - Additional Information (Details) - USD ($)		12 Months Ended
	Jul. 22, 2015	Jan. 31, 2016	Jan. 31, 2015	Jul. 31, 2015	Jul. 06, 2015
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares outstanding		0	0
Preferred stock, dividends declared		$ 0
Conversion of preferred stock into common stock		1
Convertible preferred stock, conversion terms		Conversion of each share of preferred stock was automatic upon the earlier of (i) a firm commitment underwritten public offering that valued the Company at not less than $100 million and that resulted in proceeds to the Company of not less than $50 million or (ii) a date that was specified by a vote of the holders of a majority of the preferred stock. In the event the Company completed a liquidation transaction or qualified initial public offering in which the conversion price for the Series Beta preferred stock was greater than 75% of the consideration per share or offering price, the conversion price had to automatically adjust to 75% of the consideration per share or offering price.
Aggregate indebtedness		$ 100,000
Common stock, shares authorized		100,000,000	13,000,000		100,000,000
Common stock, par value		$ 0.0001	$ 0.0001		$ 0.0001
Preferred stock, shares authorized		10,000,000	0		10,000,000
Preferred stock, par value		$ 0.0001	$ 0.0001		$ 0.0001
Common stock, shares outstanding		16,916,250	2,515,065
Common stock, shares issued		16,916,250	2,515,065	2,612
Preferred stock, shares issued		0	0
Common stock, shares, issued		0	131,810
Shares excluded from common stock outstanding for early exercise of common stock		173,404	502,359
Accrued expenses and other long-term liabilities		$ 200,000	$ 300,000
Initial Public Offering
Common Stock And Preferred Stock [Line Items]
Common stock, shares issued		5,000,000		5,000,000
Maximum
Common Stock And Preferred Stock [Line Items]
Underwritten public offering		$ 100,000,000
Proceeds from conversion		$ 50,000,000
Common Stock
Common Stock And Preferred Stock [Line Items]
Conversion of convertible preferred stock to common stock upon initial public offering, Shares		8,878,857
Series Alpha preferred stock and Series Alpha -1 preferred stock
Common Stock And Preferred Stock [Line Items]
Stock conversion ratio	1.00%
Series Alpha preferred stock and Series Alpha -1 preferred stock \| Common Stock
Common Stock And Preferred Stock [Line Items]
Conversion of convertible preferred stock to common stock upon initial public offering, Shares	8,353,748
Series Beta Preferred Stock
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares outstanding	241,469
Preferred stock, dividends paid per share		$ 1.6962
Liquidation preference to the holders		$ 21.2028
Series Beta Preferred Stock \| Minimum
Common Stock And Preferred Stock [Line Items]
Percentage of conversion price		75.00%
Series Beta Preferred Stock \| Common Stock
Common Stock And Preferred Stock [Line Items]
Conversion of convertible preferred stock to common stock upon initial public offering, Shares	525,109
Series Alpha Preferred Stock
Common Stock And Preferred Stock [Line Items]
Preferred stock, dividends paid per share		$ 0.3756
Liquidation preference to the holders		4.70
Series Alpha-1 Preferred stock
Common Stock And Preferred Stock [Line Items]
Preferred stock, dividends paid per share		3.214
Liquidation preference to the holders		$ 40.1740

Common Stock and Preferred Stock - Summary of Convertible Preferred Stock Outstanding (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jul. 22, 2015	Jul. 06, 2015	Jan. 31, 2015
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares authorized	10,000,000		10,000,000	0
Convertible preferred series Alpha
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares authorized		8,060,629		8,125,000
Shares issued and outstanding		7,868,605		7,868,605
Aggregate liquidation preference		$ 36,943		$ 36,943
Carrying value		$ 30,632		$ 30,632
Convertible preferred series Alpha-1
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares authorized		485,146		583,333
Shares issued and outstanding		485,143		485,143
Aggregate liquidation preference		$ 19,490		$ 19,490
Carrying value		$ 3,005		$ 3,005
Convertible preferred series Beta
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares authorized		471,635
Shares issued and outstanding		241,469
Aggregate liquidation preference		$ 5,120
Carrying value		$ 5,000
Convertible Preferred Stock
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares authorized	0	9,017,410		8,708,333
Shares issued and outstanding		8,595,217		8,353,748
Aggregate liquidation preference		$ 61,553		$ 56,433
Carrying value		$ 38,637		$ 33,637

Common Stock and Preferred Stock - Schedule of Common Stock Reserved for Issuance (Details) - shares	Jan. 31, 2016	Jan. 31, 2015
Common Stock And Preferred Stock [Line Items]
Total conversion of preferred stock		8,353,748
Total shares reserved for issuance	4,922,420	10,659,853
Conversion of Series Alpha preferred stock
Common Stock And Preferred Stock [Line Items]
Total conversion of preferred stock		7,868,605
Conversion of Series Alpha-1 preferred stock
Common Stock And Preferred Stock [Line Items]
Total conversion of preferred stock		485,143
Warrants to purchase Series Alpha preferred stock
Common Stock And Preferred Stock [Line Items]
Total conversion of common stock		192,009
Warrants to purchase common stock
Common Stock And Preferred Stock [Line Items]
Total conversion of common stock	97,931	87,828
Options to purchase common stock outstanding
Common Stock And Preferred Stock [Line Items]
Total conversion of common stock	2,087,584	1,893,239
Options available for future grant under stock option plan
Common Stock And Preferred Stock [Line Items]
Total conversion of common stock	1,254,404	133,029
Shares reserved under Employee Stock Purchase Plan
Common Stock And Preferred Stock [Line Items]
Total conversion of common stock	425,596
Restricted stock units outstanding
Common Stock And Preferred Stock [Line Items]
Total conversion of common stock	1,056,905

Stockholders' Equity (Deficit) - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2016 USD ($) Peroid $ / shares shares	Jan. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2014 USD ($) $ / shares	Jul. 31, 2015 $ / shares shares	Jul. 22, 2015 $ / shares	May 31, 2015 shares	Dec. 31, 2010 $ / shares
Stockholders Equity Note Disclosure [Line Items]
Purchase price of shares under ESPP \| $ / shares				$ 13.00			$ 13.00
Stock-based compensation \| $	$ 4,653	$ 426	$ 72
Exercise price per share of warrants \| $ / shares		$ 6.04		4.70			$ 4.70
Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Warrants expiration period	2025-01
Maximum \| Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Exercise price per share of warrants \| $ / shares	$ 6.04
Minimum \| Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Exercise price per share of warrants \| $ / shares	$ 4.70
Employee Stock Option
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $	$ 2,607	$ 426	72
Employee stock option expiration period	10 years
Aggregate intrinsic value of vested options exercised \| $	$ 800	$ 500	$ 100
Weighted-average grant date fair value of options granted \| $ / shares	$ 6.92	$ 5.20	$ 0.82
Employee Stock Option \| Maximum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period	5 years
Restricted Stock Units (RSUs)
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $	$ 1,644
Employee stock option vesting period	1 year 5 months 5 days
Number of Shares, RSUs granted	1,157,105	0
Number of Shares, RSUs vested	0
Restricted Stock Units (RSUs) \| Maximum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period	4 years
Restricted Stock Units (RSUs) \| Minimum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period	1 year
Initial Public Offering
Stockholders Equity Note Disclosure [Line Items]
Purchase price of shares under ESPP \| $ / shares	$ 13.00			$ 13.00	$ 13.00
Exercise price per share of warrants \| $ / shares					$ 4.70
ESPP
Stockholders Equity Note Disclosure [Line Items]
Shares authorized for future issuance				441,165
Percentage of eligible compensation subject to plan limitation				15.00%
Employee stock purchase plan offering period	24 months
Number of purchase periods \| Peroid	4
Purchase periods	6 months
Purchase price of common stock as percentage of fair market value	85.00%
Number of shares issued under ESPP	15,569
Purchase price of shares under ESPP \| $ / shares	$ 7.12
Incremental expense will be recognized over the remaining term \| $	$ 400
Stock-based compensation \| $	$ 402
2005 Plan
Stockholders Equity Note Disclosure [Line Items]
Number of shares increasing under the plan						250,000
Maximum aggregate number of shares issued under the plan						4,433,102
2015 Equity Incentive Plan
Stockholders Equity Note Disclosure [Line Items]
Maximum aggregate number of shares issued under the plan	4,433,102
Additional aggregate number of shares issued under the plan	2,205,828
Percentage of common stock outstanding	5.00%
Common stock available for future issuance	1,254,404
2015 Equity Incentive Plan \| Initial Public Offering
Stockholders Equity Note Disclosure [Line Items]
Percentage of common stock outstanding	10.00%

Stockholders' Equity (Deficit) - Summary of Stock Option Activity Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Number of Options Outstanding
Number of Options Outstanding, Beginning balance	1,893,239
Number of Options Outstanding, Options granted	427,948
Number of Options Outstanding, Options exercised	(83,229)
Number of Options Outstanding, Options canceled	(150,374)
Number of Options Outstanding, Ending balance	2,087,584	1,893,239
Number of Options Outstanding, Vested and exercisable	706,322
Number of Options Outstanding, Vested and expected to vest	2,005,813
Weighted Average Exercise Price Per Share
Weighted Average Exercise Price Per Share, Beginning balance	$ 3.85
Weighted Average Exercise Price Per Share, Options granted	12.55
Weighted Average Exercise Price Per Share, Options exercised	0.79
Weighted Average Exercise Price Per Share, Options canceled	6.16
Weighted Average Exercise Price Per Share, Ending balance	5.59	$ 3.85
Weighted Average Exercise Price Per Share, Vested and exercisable	1.90
Weighted Average Exercise Price Per Share, Vested and expected to vest	$ 5.50
Weighted Average Contractual Term
Weighted Average Contractual Term	7 years 10 months 24 days	8 years 4 months 24 days
Weighted Average Contractual Term, Vested and exercisable	5 years 8 months 12 days
Weighted Average Contractual Term, Vested and expected to vest	7 years 9 months 18 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Beginning balance	$ 10,109
Aggregate Intrinsic Value, Ending balance	4,843	$ 10,109
Aggregate Intrinsic Value, Vested and exercisable	3,682
Aggregate Intrinsic Value, Vested and expected to vest	$ 4,779

Stockholders' Equity (Deficit) - Summary of RSU activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Number of Shares
Number of Shares, RSUs Beginning Balance
Number of Shares, RSUs granted	1,157,105	0
Number of Shares, RSUs vested	0
Number of Shares, RSUs canceled	(100,200)
Number of Shares, RSUs Ending Balance	1,056,905
Weighted-Average Grant-Date Fair Value Per Share
Weighted-Average Grant-Date Fair Value Per Share, Beginning Balance
Weighted-Average Grant-Date Fair Value Per Share, RSUs granted	$ 9.62
Weighted-Average Grant-Date Fair Value Per Share, RSUs canceled	9.74
Weighted-Average Grant-Date Fair Value Per Share, Ending Balance	$ 9.60
Weighted-Average Remaining Contractual Life
Weighted-Average Remaining Vesting Period	1 year 5 months 5 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 7,176

Stockholders' Equity (Deficit) - Summary of Common Stock Warrants Activity (Details) - Common Stock Warrants	12 Months Ended
	Jan. 31, 2016 shares
Class Of Warrant Or Right [Line Items]
Common Warrants Outstanding, Beginning Balance	87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO	87,325
Less: Common warrants exercised to common stock	(30,573)
Less: Common warrants terminated	(46,649)
Common Warrants Outstanding, Ending Balance	97,931

Stock-Based Compensation - Total Stock-Based Compensation Recognized for Stock-Based Awards in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 4,653	$ 426	$ 72
Total cost of revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	437	36	7
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	611	41	6
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,683	169	26
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,922	$ 180	$ 33

Stock-Based Compensation - Stock-Based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 4,653	$ 426	$ 72
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	2,607	$ 426	$ 72
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	1,644
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 402

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	70,199	67,884
Stock-based compensation	$ 4,653	$ 426	$ 72
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 5,800
Stock-based compensation expenses recognized on straight line basis offering period	2 years 6 months
Stock-based compensation	$ 2,607	$ 426	$ 72
Employee Stock Option \| Non Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	200
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 7,700
Stock-based compensation expenses recognized on straight line basis offering period	2 years 4 months 24 days
Non employee stock options outstanding	1,056,905
Stock-based compensation	$ 1,644
Restricted Stock Units (RSUs) \| Non Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	70,500	0
Stock-based compensation	$ 100
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 1,200
Stock-based compensation expenses recognized on straight line basis offering period	10 months 24 days
Stock-based compensation	$ 402
Outstanding, ESPP	0

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Options Grants Using Black-Scholes Option Pricing Model (Details)		12 Months Ended
	Jul. 22, 2015	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	66.00%
Risk-free interest rate, minimum	0.00%			0.30%
Expected volatility, maximum	70.00%
Risk-free interest rate, maximum	0.30%			0.50%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	0 years		1 year 3 months 18 days	1 month 6 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	1 year 1 month 6 days		1 year 4 months 24 days	2 years 4 months 24 days
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum		54.00%	69.00%	77.00%
Risk-free interest rate, minimum		1.60%	1.50%	0.80%
Expected volatility, maximum		62.00%	81.00%	79.00%
Risk-free interest rate, maximum		1.90%	2.00%	2.20%
Employee Stock Option \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)		5 years 3 months 18 days	5 years 4 months 24 days	5 years 1 month 6 days
Employee Stock Option \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)		6 years 1 month 6 days	6 years 3 months 18 days	6 years 3 months 18 days

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of ESPP (Details)		12 Months Ended
	Jul. 22, 2015	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	66.00%
Risk-free interest rate, minimum	0.00%			0.30%
Expected volatility, maximum	70.00%
Risk-free interest rate, maximum	0.30%			0.50%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	0 years		1 year 3 months 18 days	1 month 6 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	1 year 1 month 6 days		1 year 4 months 24 days	2 years 4 months 24 days
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum		35.00%
Risk-free interest rate, minimum		0.10%
Expected volatility, maximum		44.00%
Risk-free interest rate, maximum		0.80%
ESPP \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)		8 months 12 days
ESPP \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)		2 years 2 months 12 days

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Income Tax [Line Items]
Federal statutory income tax rate	34.00%	34.00%	34.00%
Valuation allowance for deferred tax assets	$ 29,868,000	$ 25,785,000	$ 23,700,000
Net change in valuation allowance	$ 4,100,000
Net operating loss carryforwards, expired	2030
Income tax benefit		502,000
Long term net deferred tax liabilities , acquired intangible assets	$ 301,000	594,000
Unrecognized tax benefits	1,217,000	1,029,000	$ 743,000
Interest expense or penalties related to unrecognized tax benefits	$ 0	0
Talkatone, Inc.
Income Tax [Line Items]
Income tax benefit		500,000
Long term net deferred tax liabilities , acquired intangible assets		$ 500,000
Research and Development
Income Tax [Line Items]
Federal tax credit, expired	2030
Federal
Income Tax [Line Items]
Net operating loss carryforwards	$ 64,200,000
Net operating loss carryforwards, deductions from stock-based compensation	400,000
Federal \| Research and Development
Income Tax [Line Items]
Tax credit carryforwards	1,700,000
State
Income Tax [Line Items]
Net operating loss carryforwards	55,000,000
Net operating loss carryforwards, deductions from stock-based compensation	400,000
State \| Research and Development
Income Tax [Line Items]
Tax credit carryforwards	$ 1,300,000

Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Income Tax Disclosure [Abstract]
Federal tax at statutory rate	$ (4,787)	$ (2,350)	$ (680)
Change in valuation allowance	4,502	2,132	831
State taxes	(261)	(437)	(156)
Stock-based compensation	691	92	14
Research and development credit	(273)	(192)	(131)
Permanent tax adjustment	$ 128	23	104
Other		230	$ 18
Total		$ (502)
Federal tax at statutory rate, Rate	34.00%	34.00%	34.00%
Change in valuation allowance, Rate	(32.00%)	(31.00%)	(42.00%)
State taxes, Rate	2.00%	6.00%	8.00%
Stock-based compensation, Rate	(5.00%)	(1.00%)	(1.00%)
Research and development credit, Rate	2.00%	3.00%	7.00%
Permanent tax adjustment, Rate	(1.00%)		(5.00%)
Other, Rate		(3.00%)	(1.00%)
Total, Rate		8.00%

Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Deferred tax assets:
Accruals and reserves	$ 2,297	$ 2,036
Stock-based compensation	1,334	436
Intangible assets amortization	110	243
Deferred revenue	13	15
Fixed assets depreciation		168
Net operating loss carry forwards	24,869	22,240
Tax credit carryover	1,558	1,241
Gross deferred tax assets	30,181	26,379
Valuation allowance	(29,868)	(25,785)	$ (23,700)
Net deferred tax assets	313	594
Deferred tax liabilities:
Acquired intangible assets	(301)	(594)
Fixed assets depreciation	(12)
Gross deferred tax liabilities	$ (313)	$ (594)

Income Taxes - Summary of Activity Related to UTBs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Balance at January 31, 2014	$ 1,029	$ 743
Increase related to prior year positions		59
(Decrease) related to prior year positions	(16)
Increase related to current year tax positions	204	227
Balance at January 31, 2015	$ 1,217	$ 1,029

Retirement Plan - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Minimum age of employees covered under 401(k) plan	21 years
Employee contributions maximum amount	$ 18,000
Employee contributions maximum amount, over fifty years of age.	$ 24,000
Employer contribution, percent of match	50.00%
Employee maximum contribution percent of deferred salary amount	6.00%
Vesting percentage	100.00%
Contributions expenses	$ 300,000	$ 200,000	$ 100,000

Commitments and Contingencies - Additional Information (Details)	1 Months Ended			12 Months Ended
	Jan. 31, 2016 USD ($)	Jan. 31, 2015 USD ($)	Mar. 31, 2011 Unit	Jan. 31, 2016 USD ($)	Jan. 31, 2015 USD ($)	Jan. 31, 2014 USD ($)
Operating Leased Assets [Line Items]
Rent expense				$ 1,200,000	$ 900,000	$ 600,000
License agreement, minimum number of units sold, requiring royalty payment \| Unit			250,000
Contingent liabilities requiring accrual or disclosure	$ 0			$ 0
Palo Alto
Operating Leased Assets [Line Items]
Operating lease expiration date				2017-11
Rent expense	$ 40,000
Lease Agreement One
Operating Leased Assets [Line Items]
Capital lease of computer equipment maturity date		2016-12
Right to purchase the equipment, amount		$ 1

Commitments and Contingencies - Minimum Rental Commitments under Noncancelable Leases (Details) $ in Thousands	Jan. 31, 2016 USD ($)
Capital Leases
2017	$ 653
Total	653
Less: Amount representing interest	(21)
Present value of lease payments	632
Less: Current portion	(632)
Operating Leases
2017	1,802
2018	1,421
2019	45
Total	$ 3,268

Acquisitions - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Business Acquisition [Line Items]
Amortization of intangible assets	$ 393,000	$ 306,000	$ 151,000
Talkatone, Inc.
Business Acquisition [Line Items]
Total consideration		2,264,000
Earn-out payments, fair market value		1,000,000
Earn-out payments, gross amount		2,200,000
Acquisition, transaction costs		12,000
Earn-out consideration, cash paid	$ 700,000
Earn-out consideration, shares issued	49,159
Amortization of intangible assets	$ 400,000	$ 200,000

Acquisitions - Components of Total Consideration (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Business Acquisition [Line Items]
Cash consideration paid at closing		$ 672
Shares issued as consideration in business acquisition and related earn-out	$ 451	338
Talkatone, Inc.
Business Acquisition [Line Items]
Cash consideration paid at closing		887
Shares issued as consideration in business acquisition and related earn-out		338
Contingent consideration		1,039
Total consideration		$ 2,264

Acquisitions - Components of Total Consideration (Parenthetical) (Details)	12 Months Ended
	Jan. 31, 2015 shares
Talkatone, Inc.
Business Acquisition [Line Items]
Common stock, number of shares	90,426

Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 1,117	$ 1,117
Talkatone, Inc.
Business Acquisition [Line Items]
Cash	215
Net liabilities assumed	(60)
Non-current deferred tax liabilities	(502)
Goodwill	1,117
Net assets acquired	2,264
Talkatone, Inc. \| Developed technology
Business Acquisition [Line Items]
Intangible asset	815
Talkatone, Inc. \| Non-compete agreement
Business Acquisition [Line Items]
Intangible asset	118
Talkatone, Inc. \| User relationships
Business Acquisition [Line Items]
Intangible asset	458
Talkatone, Inc. \| Trade name
Business Acquisition [Line Items]
Intangible asset	$ 103

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Numerator
Net loss	$ (14,052)	$ (6,410)	$ (2,000)
Denominator
Weighted-average common shares for basic and diluted net loss per share	10,173,095	2,284,241	1,688,846
Basic and diluted net loss per share	$ (1.38)	$ (2.81)	$ (1.18)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss Per Share - Potential Dilutive Securities Outstanding of Common Stock Excluded from Diluted Weighted-Average Common Shares Outstanding (Details) - shares	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	3,796,890	11,029,183	10,225,161
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	381,066
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	2,087,584	1,893,239	899,478
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	1,056,905
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share		8,353,748	8,333,341
Common stock subject to repurchase
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	173,404	502,359	739,798
Warrants to purchase convertible preferred stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share		192,009	217,814
Warrants to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	97,931	87,828	34,730

Subsequent Events - Additional Information (Details) - Restricted Stock Units (RSUs) - shares	2 Months Ended	12 Months Ended
	Apr. 11, 2016	Jan. 31, 2016	Jan. 31, 2015
Subsequent Event [Line Items]
Number of units granted to officers, employees and non-employees.		1,157,105	0
Employee stock option vesting period		1 year 5 months 5 days
Subsequent Event
Subsequent Event [Line Items]
Number of units granted to officers, employees and non-employees.	1,283,050
Employee stock option vesting period	4 years