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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Jan. 31, 2017	Mar. 31, 2017	Jul. 31, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2017
Document Fiscal Year Focus	2017
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	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,245,827
Entity Public Float			$ 79.8

CONSOLIDATED BALANCE SHEETS - USD ($)	Jan. 31, 2017	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 3,990,000	$ 27,413,000
Short-term investments	49,211,000	27,991,000
Accounts receivable, net	4,714,000	5,609,000
Inventories	5,830,000	5,011,000
Deferred inventory costs	1,620,000	2,013,000
Prepaid expenses and other current assets	1,891,000	1,318,000
Total current assets	67,256,000	69,355,000
Property and equipment, net	4,176,000	4,291,000
Intangible assets, net	537,000	885,000
Goodwill	1,117,000	1,117,000
Other assets	252,000	888,000
Total assets	73,338,000	76,536,000
Current liabilities:
Accounts payable	5,857,000	4,786,000
Accrued expenses	11,579,000	13,010,000
Short-term capital lease	0	632,000
Deferred revenue	15,521,000	15,036,000
Total current liabilities	32,957,000	33,464,000
Other liabilities	561,000	182,000
Total liabilities	33,518,000	33,646,000
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock $0.0001 par value: 10,000,000 shares authorized; no shares issued and outstanding on January 31, 2017 and January 31, 2016, respectively
Common stock $0.0001 par value: 100,000,000 shares authorized; 17,995,555 and 16,916,250 shares issued and outstanding on January 31, 2017 and January 31, 2016, respectively	2,000	2,000
Additional paid-in capital	117,639,000	107,679,000
Accumulated other comprehensive (loss) income	(11,000)	17,000
Accumulated deficit	(77,810,000)	(64,808,000)
Total stockholders’ equity	39,820,000	42,890,000
Total liabilities and stockholders’ equity	$ 73,338,000	$ 76,536,000

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jan. 31, 2017	Jan. 31, 2016
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
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	100,000,000
Common stock, shares issued	17,995,555	16,916,250
Common stock, shares outstanding	17,995,555	16,916,250

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Revenue:
Subscription and services	$ 91,127	$ 73,064	$ 53,828
Product and other	13,397	15,711	18,373
Total revenue	104,524	88,775	72,201
Cost of revenue:
Subscription and services	29,650	25,715	18,284
Product and other	15,545	16,150	18,440
Total cost of revenue	45,195	41,865	36,724
Gross profit	59,329	46,910	35,477
Operating expenses:
Sales and marketing	33,768	28,534	22,276
Research and development	24,239	18,502	12,290
General and administrative	14,598	12,561	6,650
Total operating expenses	72,605	59,597	41,216
Loss from operations	(13,276)	(12,687)	(5,739)
Other income (expense):
Interest income (expense), net	370	(881)	(323)
Change in fair value of warrants		(442)	(795)
Other expense, net	(43)	(42)	(55)
Loss before income taxes	(12,949)	(14,052)	(6,912)
Income tax benefit			502
Net loss	$ (12,949)	$ (14,052)	$ (6,410)
Net loss per share of common stock:
Basic and diluted	$ (0.74)	$ (1.38)	$ (2.81)
Weighted-average number of shares used in per share amounts:
Basic and diluted	17,490,448	10,173,095	2,284,241

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (12,949)	$ (14,052)	$ (6,410)
Other comprehensive (loss) income
Unrealized (loss) gain on short-term investment	(28)	17
Comprehensive loss	$ (12,977)	$ (14,035)	$ (6,410)

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, 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		7,868,605	485,143		2,515,065
Issuance of stock				$ 5,000
Issuance of stock, Shares				241,469
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 common stock upon initial public offering, net of issuance costs	56,879				$ 1	56,878
Issuance of common stock upon initial public offering, net of issuance costs, Shares					5,000,000
Issuance of common stock for stock option exercises	66					66
Issuance of common stock for stock option exercises, Shares					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 (loss)	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
Issuance of common stock for stock option exercises	$ 301					301
Issuance of common stock for stock option exercises, Shares	213,164				208,164
Issuance of common stock in conjunction with acquisition	$ 165					165
Issuance of common stock in conjunction with acquisition, Shares					26,375
Vesting of early exercised stock options and restricted stock	81					81
Vesting of early exercised stock options and restricted stock, Shares					123,221
Issuance of common stock related to employee stock purchase plan	1,176					1,176
Issuance of common stock related to employee stock purchase plan, Shares					234,792
Issuance of common stock upon vesting of restricted stock units, Shares					657,034
Shares repurchased for tax withholdings on vesting of restricted stock units	(1,588)					(1,588)
Shares repurchased for tax withholdings on vesting of restricted stock units, Shares					(170,281)
Stock-based compensation	9,772					9,772
Other comprehensive income (loss)	(28)						(28)
Cumulative stock-based compensation forfeiture adjustment						53		(53)
Net loss	(12,949)							(12,949)
BALANCE at Jan. 31, 2017	$ 39,820				$ 2	$ 117,639	$ (11)	$ (77,810)
BALANCE, Shares at Jan. 31, 2017	109,315				17,995,555

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Cash flows from operating activities:
Net loss	$ (12,949)	$ (14,052)	$ (6,410)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation expense	9,772	4,653	426
Depreciation and amortization	1,849	1,410	896
Amortization of intangible assets	348	393	306
Deferred income taxes			(502)
Others	10	64	57
Write-off of non-cash deferred debt issuance costs		332
Change in fair value of acquisition related contingent consideration		(281)	656
Change in fair value of warrant liability		442	795
Changes in operating assets and liabilities:
Accounts receivable, net	895	(1,215)	(2,095)
Inventories	(819)	3,070	(3,206)
Deferred inventory costs	393	235	(751)
Prepaid expenses and other assets	84	(470)	331
Accounts payable and accrued expenses	(99)	4,392	1,212
Other liabilities	(57)	(132)	204
Deferred revenue	958	689	4,014
Net cash provided by (used in) operating activities	385	(470)	(4,067)
Cash flows from investing activities:
Purchases of short-term investments	(59,007)	(28,078)
Proceeds from maturity of short-term investments	32,330
Proceeds from sale of short-term investments	5,266
Purchases of property and equipment	(1,558)	(2,884)	(1,186)
Business acquisition, net of cash assumed			(672)
Net cash used in investing activities	(22,969)	(30,962)	(1,858)
Cash flows from financing activities:
Proceeds from initial public offering, net		57,021	(142)
Repayment of debt and capital leases	(628)	(11,620)	(1,508)
Proceeds from issuance of debt			9,921
Payment of preferred warrant liability		(584)
Payment of acquisition related earn-out	(100)	(326)
Proceeds from issuance of common stock related to warrants and employee stock benefit plans	1,477	221	423
Net cash (used in) provided by financing activities	(839)	49,712	8,694
Net (decrease) increase in cash and cash equivalents	(23,423)	18,280	2,769
Cash and cash equivalents at beginning of period	27,413	9,133	6,364
Cash and cash equivalents at end of period	3,990	27,413	9,133
Supplemental disclosure of cash flow information
Income taxes paid	3	2	1
Interest paid	18	573	173
Non-cash investing and financing activities:
Unpaid portion of property and equipment purchases	122	78	162
Shares issued as consideration in business acquisition and related earn-out	165	451	338
Conversion of preferred stock to common stock		38,637
De-recognition of warrant liability to additional paid-in capital		1,075
Unpaid offering costs			351
Issuance of warrants in connection with long-term debt			323
Purchase of equipment acquired on capital lease			$ 1,321
Restricted stock units
Cash flows from financing activities:
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (1,588)
Series Beta Preferred Stock
Cash flows from financing activities:
Proceeds from Series Beta preferred stock, net		$ 5,000

Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Jan. 31, 2017

Accounting Policies [Abstract]

Description of Business and Summary of Significant Accounting Policies

1. DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

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.

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 upon consolidation.

Fiscal Year End—The last day of Company’s fiscal year is January 31, fiscal year end January 31, 2017 is referred as fiscal 2017, fiscal year end January 31, 2016 is referred as fiscal 2016 and fiscal year end January 31, 2015 is referred as fiscal 2015.

Use of Estimates—The preparation of the Company’s 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. These estimates are based on information available as of the date of the condensed consolidated financial statements, and assumptions are inherently subjective in nature; therefore, actual results could differ from management’s estimates.

Reverse Stock Split—Effective July 6, 2015, the Company completed 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 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—In July 2015, the Company completed its initial public offering (the “IPO”) and 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 costs. See “Note 7. Convertible Preferred Stock Warrant Liability” and “Note 8. Common Stock and Preferred Stock” for more information related to the IPO.

Secondary Offering—In January 2017, the Company completed a secondary offering, in which certain stockholders of the Company affiliated with Worldview Technology Partners (the “Selling Stockholders”) sold an aggregate of 3,275,000 shares of our common stock at a public offering price of $8.65 per share, including 425,000 shares of common stock sold upon the underwriters’ exercise of the overallotment option. The Company did not receive any of the proceeds from the offering.

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 at the date of purchase 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 (loss) 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 carrying value of certain of the Company’s financial instruments, including cash equivalents, accounts receivable, inventory, accounts payable and other current assets and current liabilities approximates fair value due to their short maturities.

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, 2017, 2016 and 2015.

All of the Company’s long-lived assets were attributable to operations in the United States as of January 31, 2017 and 2016.

Comprehensive Income (Loss)—The purpose of reporting comprehensive income (loss) 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. In fiscal 2017 and 2016, the Company’s other comprehensive loss includes unrealized (loss) gain of $(28,000) and $17,000, respectively, from its available-for-sale securities. The Company did not have any components of other comprehensive income (loss) in fiscal 2015, as such the net loss for fiscal 2015 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 accounted for more than 10% of the Company’s accounts receivable balances at January 31, 2017 and January 31, 2016, respectively. The concentration of accounts receivable was as follows:

	As of January 31,
	2017			2016
Customer A		11	%	*
Customer B	*				13	%

*	represents less than 10% during the period

There were no customers that individually exceeded 10% of revenue during fiscal 2017, 2016 and 2015.

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, 2017 and January 31, 2016, the Company recorded allowance for doubtful accounts and allowance for returns of $0.2 million and $0 on the consolidated balance sheets, 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 $0.4 million and $0.5 million of website development costs in fiscal 2017 and 2016, 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, 2017 and 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 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. Upon 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 did not have outstanding warrants to purchase convertible preferred stock as of January 31, 2017 and January 31, 2016. Prior to the completion of the IPO in July 2015, the Company had 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 estimated fair values of outstanding preferred stock warrant liabilities were measured using Monte-Carlo simulation and Black-Scholes valuation models. 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.

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 $16.5 million, $13.9 million and $14.8 million for the years ended January 31, 2017, 2016 and 2015, respectively.

Advertising costs incurred by channel partners are recorded as reduction of revenue. These costs totaled $0.3 million, $0.5 million and $0.8 million for the years ended January 31, 2017, 2016 and 2015, 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 (“RSUs”) 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 over the requisite service period, which is generally the vesting period. 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 the change in value, if any, is recognized in the consolidated statement of operations during the period the related services are performed.

The Company adopted Accounting Standards Update (“ASU”) 2016-09, Improvements to Employee Share-Based Payment Accounting in the third quarter of fiscal 2017 and elected to account for forfeitures as they occur rather than estimate expected forfeiture. Refer to “Recently Adopted Accounting Standard” for more information.

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.

Recently Adopted Accounting Standard

In July 2015, the Financial Accounting Standard Board (“FASB”) issued ASU 2015-11 (ASC 330), Simplifying the Measurement of Inventory. This guidance 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. Early adoption is permitted. The Company adopted ASU 2015-11 as of January 31, 2017 on a prospective basis and there was no impact of this guidance on its consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting. This 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. The Company early adopted ASU 2016-09 during the third quarter of fiscal 2017. The Company has elected to account for forfeitures as they occur rather than estimate expected forfeiture using a modified retrospective transition method. As a result of this the Company recorded a cumulative-effect adjustment of $0.1 million to accumulated deficit and additional paid-in capital. Additionally, under ASU 2016-09, excess tax benefits and deficiencies are required to be recognized prospectively as part of provision for income taxes rather than additional paid-in capital. The adoption did not have any material impact on our accounting of provision for income taxes. Finally, ASU 2016-09 requires excess tax benefits to be presented as a component of operating cash flows rather than financing cash flows. The Company has adopted this requirement prospectively and accordingly, prior periods have not been adjusted. Excess tax benefits were not material for all periods presented.

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.

Recent Accounting Pronouncements Not Yet Adopted

In January 2017, the FASB issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350) that will eliminate the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, impairment charge will be based on the excess of a reporting unit's carrying amount over its fair value. The guidance is effective for the Company in the first quarter of fiscal 2023. Early adoption is permitted. The Company does not anticipate the adoption of this guidance to have a material impact on its consolidated financial statements, absent any goodwill impairment.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments, which provides guidance to reduce diversity in practice for eight cash flow classification issues, such as debt prepayment or debt extinguishment cost, contingent consideration payment made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies and distributions received from equity method investees. ASU 2016-15 will become effective for the Company in the first quarter of fiscal 2019. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on its condensed 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 August 2014, the FASB issued ASU 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 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, and requires expanded qualitative and quantitative disclosures relating to the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and estimates used by management.

In August 2015, the FASB issued ASU 2015-14 and approved a one-year deferral of the effective date of ASU 2014-09. In March 2016, April 2016 and May 2016, the FASB issued ASU 2016-08, ASU 2016-10 and ASU 2016-12, respectively that clarify the implementation guidance on principal versus agent considerations, identification of performance obligations, collectability criterion and noncash consideration of the new standard. ASU 2014-09 will become effective for the Company in the first quarter of fiscal 2019. Early adoption is permitted and the new standard can be adopted by using (i) a full retrospective approach for all periods presented in the period of adoption or (ii) a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures. The Company does not plan to early adopt the new standard. The Company is in the early stages of evaluating the impact of the new standard on its accounting policies, processes, and system requirements and has not made a final decision regarding the adoption method. The Company's final determination will depend on a number of factors, such as the significance of the impact of the new standard on its financial results, system readiness, including that of software procured from third-party providers, and its ability to accumulate and analyze the information necessary to assess the impact on prior period financial statements, as necessary. While the Company continues to assess the potential impacts of the new standard, the Company cannot reasonably estimate quantitative information related to the impact of the new standard on its financial statements at this time.

Fair Value Measurement

12 Months Ended

Jan. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurement

2. 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 were as follows (in thousands):

	As of January 31, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	951	$	—	$	—	$	951
Total cash equivalents	$	951	$	—	$	—	$	951
Cash								3,039
Total cash and cash equivalents							$	3,990

Short-term investments:
U.S. government securities	$	17,798	$	—	$	—	$	17,798
Corporate debt securities		—		18,436		—		18,436
Commercial paper		—		5,386		—		5,386
U.S. agency securities		—		5,777		—		5,777
Asset-backed securities		—		1,814		—		1,814
Total short-term investments	$	17,798	$	31,413	$	—	$	49,211

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

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

There were no transfers into or out of the Level 3 category during fiscal 2017 and 2016.

As of January 31, 2016, the Level 3 liabilities consisted of acquisition-related contingent consideration of $0.3 million, which the Company paid out using $0.1 million in cash and $0.2 million in shares of common stock during fiscal 2017. The Company did not hold Level 3 assets and liabilities as of January 31, 2017.

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. 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 in fiscal 2016 and recorded a $0.3 million reduction in the previously recorded expense.

Changes in the Level 3 fair value category for the periods presented were as follows (in thousands):

	Acquisition-Related Contingent Consideration
Balance at January 31, 2016	$	288
Payout of consideration		(123	)
Issuance of shares		(165	)
Balance at January 31, 2017	$	—

The carrying value of the Company’s accounts receivable, inventory, accounts payable 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, 2017

Investments Debt And Equity Securities [Abstract]

Short-term Investments

3. SHORT-TERM INVESTMENTS

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

	As of January 31, 2017
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	18,455	$	(20	)	$	1	$	18,436
Commercial paper		5,386		—			—		5,386
U.S. agency securities		5,774		—			3		5,777
U.S. government securities		17,793		(2	)		7		17,798
Asset-backed securities		1,814		—			—		1,814
Total short-term investments	$	49,222	$	(22	)	$	11	$	49,211

	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 gross realized gains and losses related to the Company’s short-term investments were not material for the year ended January 31, 2017. The Company did not have any gross realized gains and gross realized losses for the years ended January 31, 2016 and 2015.

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

	As of January 31, 2017				As of January 31, 2016
	Amortized Value		Fair Value		Amortized Value		Fair Value
One year or less	$	44,806	$	44,794	$	19,143	$	19,145
Over one year and less than two years		4,416		4,417		8,831		8,846
Total	$	49,222	$	49,211	$	27,974	$	27,991

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

	As of January 31, 2017					As of January 31, 2016
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	18,436	$	(20	)	$	7,845	$	(6	)
U.S. government securities		17,798		(2	)		—		—
Total	$	36,234	$	(22	)	$	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, 2017 and 2016 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, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

4. 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 were as follows (in thousands):

		As of January 31, 2017							As of January 31, 2016
	Estimated Life (in years)	Gross Value		Accumulated Amortization			Net Carrying Amount		Gross Value		Accumulated Amortization			Net Carrying Amount
Developed technology	5	$	815	$	(448	)	$	367	$	815	$	(285	)	$	530
User relationships	3.5		458		(360	)		98		458		(229	)		229
Trade name	5		103		(56	)		47		103		(36	)		67
Non-compete agreement	2		118		(118	)		—		118		(104	)		14
Patents and licenses	3.8-7		714		(689	)		25		714		(669	)		45
Total		$	2,208	$	(1,671	)	$	537	$	2,208	$	(1,323	)	$	885

At January 31, 2017 the estimated amortization expense related to the intangible assets is as follows (in thousands):

Fiscal Years Ending January 31,
2018	$	291
2019		190
2020		53
2021		3
2022 and thereafter		—
Total	$	537

- 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, 2017

Balance Sheet Components [Abstract]

Balance Sheet Components

5. BALANCE SHEET COMPONENTS

Inventories consist of the following (in thousands):

	As of January 31,
	2017		2016
Finished goods	$	4,847	$	4,633
Raw material		983		378
Total inventory	$	5,830	$	5,011

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

	As of January 31,
	2017		2016
Deferred revenue:
Subscription and services	$	13,770	$	11,954
Product and other		2,260		3,118
Total deferred revenue		16,030		15,072
Less: current portion of deferred revenue		15,521		15,036
Deferred revenue, noncurrent portion included in other long-term liabilities	$	509	$	36

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

		As of January 31,
	Estimated Life (in years)	2017			2016
Software and computer equipment	3-4	$	5,605		$	6,615
Website development costs	2		1,973			1,675
Machinery and equipment	3		1,304			1,207
Office furniture and fixtures	5		62			57
Leasehold improvements	shorter of estimated life of asset or remaining lease term		518			372
Total property and equipment		$	9,462		$	9,926
Less: accumulated depreciation and amortization			(5,286	)		(5,635	)
Property and equipment, net		$	4,176		$	4,291

Depreciation and amortization of property and equipment totaled $1.6 million, $1.4 million and $0.9 million for the years ended January 31, 2017, 2016 and 2015, respectively. During fiscal 2017 the Company wrote off certain computer equipment and software with original cost and accumulated depreciation of $1.9 million and $1.9 million, respectively, and recorded a loss of $14,000 in other expense, net in the consolidated statements of operations.

Computer equipment under a capital lease agreement and the related accumulated depreciation at January 31, 2016 was $1.5 million and $0.5 million, respectively. The Company did not have any outstanding capital lease as of January 31, 2017.

Accrued expenses consist of the following (in thousands):

	As of January 31,
	2017		2016
Accrued regulatory fees and taxes	$	4,315	$	5,216
Accrued payroll and related expenses		4,546		3,559
Acquisition-related contingent consideration		—		288
Other accrued expenses		2,718		3,947
Total accrued expenses	$	11,579	$	13,010

Debt	12 Months Ended
Debt	Jan. 31, 2017
Debt Disclosure [Abstract]
Debt	6. DEBT As of January 31, 2016, short-term debt of $0.6 million on the consolidated balance sheets related to equipment acquired under capital lease. The Company repaid this outstanding debt in April 2016 and did not have any debt as of January 31, 2017. In April 2012, (amended in October 2012), the Company entered into a secured debt agreement (“Term Debt”) in the amount of $4.0 million, with an original maturity date in September 2015 and a fixed interest rate of 5.75%. 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”) with original maturity of December 2014. The interest rate on the Revolver is 2.75% above the prime rate. In July 2014, the Company entered into an amended agreement to extend the maturity date of the Revolver until July 2016. In July 2015, the Company repaid the outstanding balance of $5.3 million under the Term Debt and the Revolver using a portion of the IPO proceeds. In July 2016, the Company entered into an amended agreement to extend the maturity of the Revolver to August 2016. The Revolver matured in August 2016. 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. 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%. 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, 2017, 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. Total interest expense recognized was $18,000, $0.9 million and $0.3 million in each year ended January 31, 2017, 2016 and 2015, respectively. Total amortization of debt issuance costs recognized was zero, $0.1 million and $0.1 million in each year ended January 31, 2017, 2016 and 2015, respectively. Total interest expense recognized in fiscal 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.

Convertible Preferred Stock Warrant Liability	12 Months Ended
Convertible Preferred Stock Warrant Liability	Jan. 31, 2017
Equity [Abstract]
Convertible Preferred Stock Warrant Liability	7. CONVERTIBLE PREFERRED STOCK WARRANT LIABILITY The Company did not have any outstanding warrants to purchase convertible preferred stock as of January 31, 2017 and January 31, 2016. 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. 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 Monte-Carlo model or IPO pricing on payout. The Company recorded a remeasurement loss of $0.1 million and $0.3 million, respectively, in other expense, net in the consolidated statement of operations during fiscal 2016 and 2015, respectively. Upon completion of the IPO in July 2015, the fair value of the warrant was determined to be $0.6 million at the IPO price of $13.00 per share. The warrant was cash settled and the Company paid $0.6 million to the warrant holder upon the closing of the IPO. In May and June 2009, the Company issued warrants to purchase 55,696 shares of Series Alpha convertible preferred stock. These warrants were initially measured at their fair value and recorded as a derivative liability. On each reporting date the change in fair value of the warrants were determined using the Black Scholes model. The Company recorded a remeasurement loss of $0.1 million and $0.3 million, respectively, in other expense, net in the consolidated statement of operations during fiscal 2016 and 2015. Upon the completion of the IPO in July 2015, the total aggregate liability of $0.4 million related to these warrants was derecognized and reclassified to additional paid-in capital which then automatically converted these warrants to purchase shares of Series Alpha convertible stock into warrants to purchase shares of common stock. 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 in connection with a debt agreement with a lender. The Company recorded the warrants as a derivative liability. The warrants were initially measured at fair value and remeasured at every reporting period date using Monte-Carlo valuation. The Company recorded a remeasurement loss of $0.3 million and $0.2 million, respectively, in the consolidated statement of operations during fiscal 2016 and 2015. 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 these warrants to purchase shares of Series Alpha convertible stock into warrants to purchase shares of common stock on a 1:1 basis. During the fourth quarter of fiscal 2016, the lender net exercised warrants to purchase 66,026 shares of Series Alpha convertible stock at an exercise price of $4.70 per share to 21,421 shares of common stock.

Common Stock and Preferred Stock

12 Months Ended

Jan. 31, 2017

Equity [Abstract]

Common Stock and Preferred Stock

8. COMMON STOCK AND PREFERRED STOCK

Convertible Preferred Stock

Upon the closing of the IPO in July 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.

Common Stock and Preferred Stock

In July 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.

Common Stock Reserved for Future Issuance

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

	Fiscal Year Ended January 31,
	2017		2016
Warrants to purchase common stock		97,931		97,931
Options to purchase common stock		1,777,365		2,087,584
Shares available for future issuance under stock plans		918,260		1,254,404
Shares reserved under Employee Stock Purchase Plan		532,597		425,596
Restricted stock units outstanding		1,859,196		1,056,905
Total shares reserved for issuance		5,185,349		4,922,420

Early Exercise of Common Stock

During the years ended January 31, 2017, 2016 and 2015, 1,771, 0 and 131,810 shares of stock options were early exercised prior to their vesting dates. The amounts received from all such early exercises is recorded in accrued expenses and other liabilities on the consolidated balance sheets and reclassified to stockholders’ equity 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, 2017 and 2016, there were 53,821 and 173,404 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, 2017 and 2016, the aggregate price of shares subject to repurchase recorded in accrued expenses and other liabilities totaled $0.1 million and $0.2 million, respectively.

Stockholders' Equity

12 Months Ended

Jan. 31, 2017

Equity [Abstract]

Stockholders' Equity

9. STOCKHOLDERS’ EQUITY

Equity Award Plans

2015 Equity Incentive Plan

In June 2015, the Company amended and restated its 2005 Stock Plan (the “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 terms of the 2005 Plan will continue to govern the terms and conditions of the outstanding awards previously granted thereunder.

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 6,638,930. In addition, pursuant to the terms of the 2015 Plan, 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 may determine. In the first quarter of fiscal 2017, the Company’s Board approved an increase of 854,483 shares of common stocks for future issuance under the 2015 Plan.

As of January 31, 2017, the Company had 918,260 shares of common stock 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”) and 441,165 shares of common stock were initially authorized for issuance. The number of authorized shares under the ESPP is subject to increase on an annual basis. In the first quarter of fiscal 2017, the Company’s Board approved an increase of 341,793 shares for future issuance pursuant to the terms of the ESPP. 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 fiscal 2017 and 2016, there were ESPP purchases that resulted in the issuance of 234,792 shares and 15,569 shares of common stock at a weighted purchase price of $5.01 and $7.12 per share, respectively.

The Company recorded stock-based compensation expense of $1.0 million and $0.4 million related to the ESPP during the years ended January 31, 2017 and 2016, respectively.

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 ten 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.

The following table summarizes the Company’s stock option activities:

				Weighted Average		Weighted Average		Aggregate
	Number of			Exercise Price		Contractual Term		Intrinsic Value
	Shares			Per Share		(in years)		(in thousands)
Balance as of January 31, 2016		2,087,584		$	5.59		7.9	$	4,843
Options exercised		(213,164	)		1.43
Options canceled		(97,055	)		12.06
Balance as of January 31, 2017		1,777,365		$	5.74		7.0	$	7,864
Vested and exercisable - January 31, 2017		1,069,258		$	4.63		6.4	$	5,776
Vested and expected to vest - January 31, 2017		1,777,365		$	5.74		7.0	$	7,864

The aggregate intrinsic value of vested options exercised during the years ended January 31, 2017, 2016 and 2015 was $1.3 million, $0.8 million and $0.5 million, respectively.

The weighted average grant date fair value of options granted during the years ended January 31, 2016 and 2015 was $6.92 and $5.20 per share, respectively. The Company did not grant any stock options during fiscal 2017.

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.

The following table summarizes the Company’s RSUs activities:

	Number of Shares			Weighted Average Grant-Date Fair Value Per Share		Weighted Average Remaining Vesting Period (in years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2016		1,056,905		$	9.60		1.4	$	7,176
RSUs granted		1,596,750			7.25
RSUs vested		(657,034	)		8.76
RSUs canceled		(137,425	)		8.01
Balance as of January 31, 2017		1,859,196		$	7.65		1.4	$	17,941

The Company did not grant any RSUs prior to fiscal 2016. The number of RSUs vested includes shares that the Company withheld on behalf of certain employees to satisfy the minimum statutory tax withholding requirements, as defined by the Company. During fiscal 2017, the Company withheld 170,281 shares of stock for an aggregate amount of $1.6 million and classified such amount as financing cash outflows in the consolidated statements of cash flows. The Company canceled and returned these shares to the 2015 Plan, which are available under the plan terms for future issuance.

Common Stock Warrants

As of January 31, 2017, the Company had warrants to purchase 97,931 shares of common stock outstanding with exercise prices ranging from $4.70 to $6.04 per share. These warrants 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
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
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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
-Section S99
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: 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 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Stock-Based Compensation

12 Months Ended

Jan. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

10. 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):

	Fiscal Year Ended January 31,
	2017		2016		2015
Total cost of revenue	$	1,026	$	437	$	36
Sales and marketing		1,438		611		41
Research and development		3,586		1,683		169
General and administrative		3,722		1,922		180
Total stock-based compensation expense	$	9,772	$	4,653	$	426

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

	Fiscal Year Ended January 31,
	2017		2016		2015
Stock options	$	2,468	$	2,607	$	426
Restricted stock units		6,272		1,644		—
Employee stock purchase plan		1,032		402		—
Total stock-based compensation expense	$	9,772	$	4,653	$	426

As of January 31, 2017, there was $3.2 million, $12.5 million and $1.0 million of unrecognized share-based compensation expense 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 1.6 years, 2.7 years and 0.9 years, respectively.

Total outstanding non-employee stock options were 109,315 and 70,199 at January 31, 2017 and 2016, respectively. The total outstanding non-employee RSUs were 73,453 and 70,500 at January 31, 2017 and 2016, respectively. The non-employee stock-based compensation expense for stock options and RSUs was $0.1 million and $0.2 million, respectively for fiscal year ended January 31, 2017. The non-employee stock-based compensation expense for stock options and RSUs was $0.2 million and $0.1 million, respectively for fiscal year ended January 31, 2016. The non-employee stock-based compensation expense for stock options and RSUs was not material for fiscal year ended January 31, 2015.

The fair value of the shares of common stock underlying stock options is based on the closing price of the Company’s 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.

The Company did not grant any stock options during fiscal 2017. For the years ended January 31, 2016 and 2015, the fair value of employee stock options grants was estimated using the Black–Scholes model with the following assumptions:

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

The Company did not offer ESPP prior to fiscal 2016. For the years ended January 31, 2017 and 2016, the fair value of the Company’s ESPP was estimated using the Black-Scholes model with the following assumptions:

	Fiscal Year Ended January 31,
	2017	2016
ESPP:
Expected volatility	37%-50%	35%-44%
Expected term (in years)	0.5-2.0	0.5-2.2
Risk-free interest rate	0.5%-1.0%	0.1%-0.8%
Dividend yield	—%	—%

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Income Taxes

12 Months Ended

Jan. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

11. 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):

	Fiscal Year Ended January 31,
	2017			Rate			2016			Rate			2015			Rate
Federal tax at statutory rate	$	(4,403	)		34	%	$	(4,787	)		34	%	$	(2,350	)		34	%
Change in valuation allowance		4,881			(38	)%		4,502			(32	)%		2,132			(31	)%
State taxes		(230	)		2	%		(261	)		2	%		(437	)		6	%
Stock-based compensation		387			(3	)%		691			(5	)%		92			(1	)%
Research and development credit		(738	)		6	%		(273	)		2	%		(192	)		3	%
Permanent tax adjustment		103			(1	)%		128			(1	)%		23			—
Other		—			—			—			—			230			(3	)%
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,
	2017			2016
Deferred tax assets:
Accruals and reserves	$	2,623		$	2,297
Stock-based compensation		1,887			1,334
Intangible assets amortization		101			110
Deferred revenue		182			13
Net operating loss carry forwards		28,120			24,869
Tax credit carryover		2,296			1,558
Gross deferred tax assets		35,209			30,181
Valuation allowance		(34,900	)		(29,868	)
Net deferred tax assets	$	309		$	313
Deferred tax liabilities:
Acquired intangible assets	$	(183	)	$	(301	)
Fixed assets depreciation		(126	)		(12	)
Gross deferred tax liabilities	$	(309	)	$	(313	)
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 $34.9 million, $29.9 million and $25.8 million as of January 31, 2017, 2016 and 2015, respectively. The net change in the total valuation allowance for the year ended January 31, 2017 was an increase of $5.0 million.

On January 31, 2017, the Company had approximately $72.9 million and $57.5 million of net operating loss (NOL) carryforwards available to offset future taxable income for both federal and state purposes, respectively. 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 $2.4 million and $2.1 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, 2017 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 four ownership changes. The first and second ownership changes occurred in April 2005, the third change occurred in February 2009 and the fourth change occurred in January 2017. NOLs presented account for any limited and potential lost attributes due to such ownership changes and their respective expiration dates.

In March 2016, the FASB issued 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. The Company early adopted ASU 2016-09 during the third quarter of fiscal 2017. Under ASU 2016-09, excess tax benefits and deficiencies are required to be recognized prospectively as part of provision for income taxes rather than additional paid-in capital. The adoption did not have any material impact on our accounting of provision for income taxes. The Company has adopted this requirement prospectively and accordingly; prior periods have not been adjusted. Excess tax benefits were not material for all periods presented and is fully offset by valuation allowance.

The Company had unrecognized tax benefits (“UTBs”) of approximately $1.8 million as of January 31, 2017. 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, 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
(Decrease) related to prior year positions		—
Increase related to current year tax positions		598
Balance at January 31, 2017	$	1,815

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 2017 and 2016.

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, 2017.

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, 2017
Compensation And Retirement Disclosure [Abstract]
Retirement Plan	12. 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’s contributions to the 401(k) defined contribution plan, which are expensed immediately as compensation costs, were $0.4 million, $0.3 million and $0.2 million for the years ended January 31, 2017, 2016 and 2015, respectively.

Commitments and Contingencies

12 Months Ended

Jan. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

13. COMMITMENTS AND CONTINGENCIES

Leases and Purchase Commitments—The Company leases office space in Palo Alto and Newark, California and office equipment under operating leases with lease periods expiring through November 2020. As of January 31, 2017, future minimum rental commitments under non-cancelable operating leases were as follows (in thousands):

	Operating
Fiscal Year Ending January 31,	Leases
2018	$	1,297
2019		71
2020		23
2021		10
Total	$	1,401

In January 2015, the Company entered into a capital lease for computer equipment that was scheduled to mature in December 2016 with the right to purchase the equipment at maturity for one dollar. The Company paid the outstanding balance of $0.6 million in fiscal 2017.

Rent expense was $2.0 million, $1.7 million, and $0.9 million for the years ended January 31, 2017, 2016 and 2015, respectively.

As of January 31, 2017, non-cancelable purchase commitments were $4.0 million.

Legal Proceedings—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.

Oregon Litigation

On August 30, 2016 the Oregon Department of Revenue (the “DOR”) issued tax assessments against the Company for the Oregon Emergency Communications Tax (the “Tax”), which the DOR alleges Ooma should have collected from its subscribers in Oregon and remitted to the DOR during the period starting on January 1, 2013 and ending on March 31, 2016 (collectively, the “Assessments”). On November 28, 2016 the Company filed a complaint in the Oregon Tax Court, asserting that the Assessments against Ooma are in violation of applicable Oregon law and are barred by the United States Constitution, and asking the Oregon Tax Court to abate the Assessments in full (the “Complaint”, and such dispute, the “Oregon Tax Litigation”). On February 10, 2016 the DOR filed an answer to the Compliant. The Company believes that the Commerce Clause of the United States Constitution bars the application of the Tax to the Company, since the Company has no employees, property or other indicia of a “substantial nexus” with the State of Oregon, and therefore the application of the Tax against Ooma and the Assessments are barred by the United States Constitution. The Company will continue to vigorously litigate the Complaint in pursuit of the full abatement of the Assessments.

Deep Green Wireless Litigation

On June 8, 2016, plaintiff Deep Green Wireless LLC filed a complaint in the U.S. District Court for the Eastern District of Texas against Ooma, Inc., alleging infringement of U.S. Patent No. RE42,714 (the “Deep Green Wireless Litigation”). The complaint seeks unspecified monetary damages, costs, attorneys’ fees and other appropriate relief. On July 29, 2016 the Company filed its answer, affirmative defenses and counterclaims, on August 2, 2016 the Company filed a motion to transfer the case to the Northern District of California, and on February 21, 2017 magistrate judge Roy S. Payne granted the Company’s motion to transfer the case. Based upon its investigation, the Company does not believe that its products infringe any valid or enforceable claim of the aforementioned patent, and plans to continue vigorously defending against the plaintiff’s claim.

Securities Litigation

On January 14, 2016, Michael Barnett filed a purported stockholder class action in the San Mateo County Superior Court of the State of California (Case No. CIV536959) against Ooma, certain of its officers and directors, and certain of the underwriters of our Initial Public Offering on July 17, 2015 (the “IPO”). Since that time two additional purported class actions making substantially the same allegations against the same defendants were filed, and on May 18, 2016 all three complaints were combined into a “consolidated complaint” filed in the same court (the “Securities Litigation”). The consolidated complaint purports to be brought on behalf of all persons who purchased shares of common stock in our IPO in reliance upon the Registration Statement and Prospectus the Company filed with the Securities and Exchange Commission (the “SEC”). The consolidated complaint alleges that Ooma and the other defendants violated the Securities Act of 1933, as amended (the “Securities Act”) by issuing the Registration Statement and Prospectus, which the plaintiffs allege contained material misstatements and omissions in violation of Sections 11, 12(a)(2) and 15 of the Securities Act. The plaintiffs seek class certification, compensatory damages, attorneys’ fees and costs, rescission or a rescissory measure of damages, equitable and/or injunctive relief, and such other relief as the court may deem proper. On July 1, 2016 Ooma filed its answer to the complaint, and on August 26, 2016 Ooma filed a motion for judgment on the pleadings. Ooma believes that the plaintiffs’ claims are without merit and is vigorously defending against the Securities Litigation.

Berks County Litigation

On January 21, 2016 the County of Berks, Pennsylvania filed a lawsuit in the Berks County Court of Common Pleas naming the Company and 113 other telephone service providers as defendants (the “Berks County Litigation”), alleging breach of fiduciary duty, fraud, and negligent misrepresentation in connection with alleged violations of the Pennsylvania 911 Emergency Communication Services Act, 35 Pa.C.S.A. §5301 et seq. (“PA 911 Act”) for failure to collect from subscribers and remit certain fees pursuant to the PA 911 Act. The plaintiff seeks a declaratory judgment that we must comply with the PA 911 Act, compensatory and punitive damages, attorneys’ fees and costs, equitable and/or injunctive relief and such other relief as the court may deem proper. On May 17, 2016 the court issued an order overruling the defendants’ joint preliminary objections, which are, in essence, the Pennsylvania equivalent of a motion to dismiss. Notwithstanding such adverse order, the Company believes that the Commerce Clause of the United States Constitution bars the application of the PA 911 Act to the Company, since the Company has no employees, property or other indicia of a “substantial nexus” with the State of Pennsylvania, and therefore the plaintiff’s claims are without merit. The Company intends to continue vigorously defending this lawsuit.

Alabama Litigation

On November 12, 2015 the Alabama Statewide 9-1-1 Board filed a lawsuit in the Circuit Court of Montgomery, Alabama against the Company (the “Alabama Litigation”). The lawsuit alleges that the Company has failed to collect from its subscribers and remit certain fees pursuant to the Alabama Emergency Telephone Services Act (the “AETS Act”). The plaintiff seeks a declaratory judgment that we must comply with the AETS Act, compensatory and punitive damages, attorneys’ fees and costs, equitable and/or injunctive relief and such other relief as the court may deem proper. The Company believes that the Commerce Clause of the United States Constitution bars the application of the AETS Act to the Company, since the Company has no employees, property or other indicia of a “substantial nexus” with the State of Alabama, and therefore the plaintiff’s claims are without merit. On January 31, 2017 the Alabama Litigation was dismissed with prejudice pursuant to a confidential settlement agreement between the parties, without resulting in a material loss to the Company.

In connection with the Oregon Litigation, Deep Green Wireless Litigation, Securities Litigation and the Berks County Litigation proceedings, the Company has determined that the amount of any material loss or range of any material losses that is reasonably possible to result from each such proceeding is not reasonably estimable. Accordingly, no material reserves have been recorded in the Company’s consolidated financial statements with respect to any of such litigations.

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, 2017

Business Combinations [Abstract]

Acquisitions

14. 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.

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 fiscal 2017 and 2016, the Company paid $0.1 million and $0.7 million in cash and issued 26,375 shares and 49,159 shares as earn-out consideration, respectively.

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, 2017 and 2016. Amortization expense related to the acquired intangible assets was $0.3 million, $0.4 million and $0.2 million for fiscal 2017, 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 acquisition completed have not been presented because the effect of the acquisition was 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=65885119&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
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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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, 2017

Earnings Per Share [Abstract]

Net Loss Per Share

15. NET LOSS PER SHARE

Basic and diluted net loss per share of common stock 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 because the effects of potentially dilutive securities are antidilutive. Upon completion of the IPO in July 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):

	Fiscal Year Ended January 31,
	2017			2016			2015
Numerator
Net loss	$	(12,949	)	$	(14,052	)	$	(6,410	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		17,490,448			10,173,095			2,284,241
Basic and diluted net loss per share	$	(0.74	)	$	(1.38	)	$	(2.81	)

The following table sets forth the potentially dilutive securities excluded from the computation of diluted net loss per share because such securities have an anti-dilutive impact due to losses reported:

	Fiscal Year Ended January 31,
	2017		2016		2015
Options to purchase common stock		1,777,365		2,087,584		1,893,239
Employee stock purchase plan		338,756		381,066		—
Convertible preferred stock		—		—		8,353,748
Restricted stock units		1,859,196		1,056,905		—
Warrants to purchase convertible preferred stock		—		—		192,009
Warrants to purchase common stock		97,931		97,931		87,828
Common stock subject to repurchase		53,821		173,404		502,359
Potential shares excluded from diluted net loss per share		4,127,069		3,796,890		11,029,183

Related Party Transaction	12 Months Ended
Related Party Transaction	Jan. 31, 2017
Related Party Transactions [Abstract]
Related Party Transaction	16. RELATED PARTY TRANSACTION One of the Company’s board of director is affiliated with a professional firm that provides public relations service to the Company. In fiscal 2017, the Company incurred expenses of approximately $0.3 million for the service provided by the firm.

Subsequent Events	12 Months Ended
Subsequent Events	Jan. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	17. SUBSEQUENT EVENTS In March 2017, the Company completed a secondary offering, in which certain stockholders of the Company affiliated with Worldview Technology Partners (the “Selling Stockholders”) sold an aggregate of 3,290,483 shares of our common stock at a public offering price of $8.85 per share, including 429,193 shares of common stock sold upon the underwriters’ exercise of the overallotment option. After this offering, Worldview Technology Partners owned less than 1% of the Company’s outstanding voting securities. The Company did not receive any of the proceeds from the offering.

Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Jan. 31, 2017

Accounting Policies [Abstract]

Principles of Consolidation

Fiscal Year End

Use of Estimates

Reverse Stock Split

Initial Public Offering

Secondary Offering

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, 2017 and 2016.

Comprehensive Income (Loss)

Net Loss per Share of Common Stock

Concentration of Credit Risk

	As of January 31,
	2017			2016
Customer A		11	%	*
Customer B	*				13	%

*	represents less than 10% during the period

There were no customers that individually exceeded 10% of revenue during fiscal 2017, 2016 and 2015.

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

Advertising

Stock-Based Compensation

Income Taxes

Recently Adopted Accounting Standard

Recent Accounting Pronouncements Not Yet Adopted

Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jan. 31, 2017

Accounting Policies [Abstract]

Concentration of Accounts Receivable

The concentration of accounts receivable was as follows:

	As of January 31,
	2017			2016
Customer A		11	%	*
Customer B	*				13	%

*	represents less than 10% during the period

Fair Value Measurement (Tables)

12 Months Ended

Jan. 31, 2017

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 were as follows (in thousands):

	As of January 31, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	951	$	—	$	—	$	951
Total cash equivalents	$	951	$	—	$	—	$	951
Cash								3,039
Total cash and cash equivalents							$	3,990

Short-term investments:
U.S. government securities	$	17,798	$	—	$	—	$	17,798
Corporate debt securities		—		18,436		—		18,436
Commercial paper		—		5,386		—		5,386
U.S. agency securities		—		5,777		—		5,777
Asset-backed securities		—		1,814		—		1,814
Total short-term investments	$	17,798	$	31,413	$	—	$	49,211

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

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

Schedule of Changes in Level 3 Fair Value Category

Changes in the Level 3 fair value category for the periods presented were as follows (in thousands):

	Acquisition-Related Contingent Consideration
Balance at January 31, 2016	$	288
Payout of consideration		(123	)
Issuance of shares		(165	)
Balance at January 31, 2017	$	—

Short-term Investments (Tables) - Short-term Investments

12 Months Ended

Jan. 31, 2017

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, 2017
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	18,455	$	(20	)	$	1	$	18,436
Commercial paper		5,386		—			—		5,386
U.S. agency securities		5,774		—			3		5,777
U.S. government securities		17,793		(2	)		7		17,798
Asset-backed securities		1,814		—			—		1,814
Total short-term investments	$	49,222	$	(22	)	$	11	$	49,211

	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 were as follows (in thousands):

	As of January 31, 2017				As of January 31, 2016
	Amortized Value		Fair Value		Amortized Value		Fair Value
One year or less	$	44,806	$	44,794	$	19,143	$	19,145
Over one year and less than two years		4,416		4,417		8,831		8,846
Total	$	49,222	$	49,211	$	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, 2017					As of January 31, 2016
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	18,436	$	(20	)	$	7,845	$	(6	)
U.S. government securities		17,798		(2	)		—		—
Total	$	36,234	$	(22	)	$	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, 2017

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 were as follows (in thousands):

		As of January 31, 2017							As of January 31, 2016
	Estimated Life (in years)	Gross Value		Accumulated Amortization			Net Carrying Amount		Gross Value		Accumulated Amortization			Net Carrying Amount
Developed technology	5	$	815	$	(448	)	$	367	$	815	$	(285	)	$	530
User relationships	3.5		458		(360	)		98		458		(229	)		229
Trade name	5		103		(56	)		47		103		(36	)		67
Non-compete agreement	2		118		(118	)		—		118		(104	)		14
Patents and licenses	3.8-7		714		(689	)		25		714		(669	)		45
Total		$	2,208	$	(1,671	)	$	537	$	2,208	$	(1,323	)	$	885

Schedule of Estimated Amortization Expense

At January 31, 2017 the estimated amortization expense related to the intangible assets is as follows (in thousands):

Fiscal Years Ending January 31,
2018	$	291
2019		190
2020		53
2021		3
2022 and thereafter		—
Total	$	537

Balance Sheet Components (Tables)

12 Months Ended

Jan. 31, 2017

Balance Sheet Components [Abstract]

Components of Inventories

Inventories consist of the following (in thousands):

	As of January 31,
	2017		2016
Finished goods	$	4,847	$	4,633
Raw material		983		378
Total inventory	$	5,830	$	5,011

Components of Deferred Revenue

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

	As of January 31,
	2017		2016
Deferred revenue:
Subscription and services	$	13,770	$	11,954
Product and other		2,260		3,118
Total deferred revenue		16,030		15,072
Less: current portion of deferred revenue		15,521		15,036
Deferred revenue, noncurrent portion included in other long-term liabilities	$	509	$	36

Components of Property and Equipment, Net

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

		As of January 31,
	Estimated Life (in years)	2017			2016
Software and computer equipment	3-4	$	5,605		$	6,615
Website development costs	2		1,973			1,675
Machinery and equipment	3		1,304			1,207
Office furniture and fixtures	5		62			57
Leasehold improvements	shorter of estimated life of asset or remaining lease term		518			372
Total property and equipment		$	9,462		$	9,926
Less: accumulated depreciation and amortization			(5,286	)		(5,635	)
Property and equipment, net		$	4,176		$	4,291

Components of Accrued Expenses

Accrued expenses consist of the following (in thousands):

	As of January 31,
	2017		2016
Accrued regulatory fees and taxes	$	4,315	$	5,216
Accrued payroll and related expenses		4,546		3,559
Acquisition-related contingent consideration		—		288
Other accrued expenses		2,718		3,947
Total accrued expenses	$	11,579	$	13,010

Common Stock and Preferred Stock (Tables)

12 Months Ended

Jan. 31, 2017

Equity [Abstract]

Schedule of Common Stock Reserved for Issuance

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

	Fiscal Year Ended January 31,
	2017		2016
Warrants to purchase common stock		97,931		97,931
Options to purchase common stock		1,777,365		2,087,584
Shares available for future issuance under stock plans		918,260		1,254,404
Shares reserved under Employee Stock Purchase Plan		532,597		425,596
Restricted stock units outstanding		1,859,196		1,056,905
Total shares reserved for issuance		5,185,349		4,922,420

Stockholders' Equity (Tables)

12 Months Ended

Jan. 31, 2017

Equity [Abstract]

Summarizes of Stock Option Activities

The following table summarizes the Company’s stock option activities:

				Weighted Average		Weighted Average		Aggregate
	Number of			Exercise Price		Contractual Term		Intrinsic Value
	Shares			Per Share		(in years)		(in thousands)
Balance as of January 31, 2016		2,087,584		$	5.59		7.9	$	4,843
Options exercised		(213,164	)		1.43
Options canceled		(97,055	)		12.06
Balance as of January 31, 2017		1,777,365		$	5.74		7.0	$	7,864
Vested and exercisable - January 31, 2017		1,069,258		$	4.63		6.4	$	5,776
Vested and expected to vest - January 31, 2017		1,777,365		$	5.74		7.0	$	7,864

Summarizes of Restricted Stock Units Activities

The following table summarizes the Company’s RSUs activities:

	Number of Shares			Weighted Average Grant-Date Fair Value Per Share		Weighted Average Remaining Vesting Period (in years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2016		1,056,905		$	9.60		1.4	$	7,176
RSUs granted		1,596,750			7.25
RSUs vested		(657,034	)		8.76
RSUs canceled		(137,425	)		8.01
Balance as of January 31, 2017		1,859,196		$	7.65		1.4	$	17,941

Stock-Based Compensation (Tables)

12 Months Ended

Jan. 31, 2017

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):

	Fiscal Year Ended January 31,
	2017		2016		2015
Total cost of revenue	$	1,026	$	437	$	36
Sales and marketing		1,438		611		41
Research and development		3,586		1,683		169
General and administrative		3,722		1,922		180
Total stock-based compensation expense	$	9,772	$	4,653	$	426

Stock-Based Compensation Expense by Award Type

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

	Fiscal Year Ended January 31,
	2017		2016		2015
Stock options	$	2,468	$	2,607	$	426
Restricted stock units		6,272		1,644		—
Employee stock purchase plan		1,032		402		—
Total stock-based compensation expense	$	9,772	$	4,653	$	426

ESPP

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

	Fiscal Year Ended January 31,
	2017	2016
ESPP:
Expected volatility	37%-50%	35%-44%
Expected term (in years)	0.5-2.0	0.5-2.2
Risk-free interest rate	0.5%-1.0%	0.1%-0.8%
Dividend yield	—%	—%

Stock Options

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

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

Income Taxes (Tables)

12 Months Ended

Jan. 31, 2017

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):

	Fiscal Year Ended January 31,
	2017			Rate			2016			Rate			2015			Rate
Federal tax at statutory rate	$	(4,403	)		34	%	$	(4,787	)		34	%	$	(2,350	)		34	%
Change in valuation allowance		4,881			(38	)%		4,502			(32	)%		2,132			(31	)%
State taxes		(230	)		2	%		(261	)		2	%		(437	)		6	%
Stock-based compensation		387			(3	)%		691			(5	)%		92			(1	)%
Research and development credit		(738	)		6	%		(273	)		2	%		(192	)		3	%
Permanent tax adjustment		103			(1	)%		128			(1	)%		23			—
Other		—			—			—			—			230			(3	)%
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,
	2017			2016
Deferred tax assets:
Accruals and reserves	$	2,623		$	2,297
Stock-based compensation		1,887			1,334
Intangible assets amortization		101			110
Deferred revenue		182			13
Net operating loss carry forwards		28,120			24,869
Tax credit carryover		2,296			1,558
Gross deferred tax assets		35,209			30,181
Valuation allowance		(34,900	)		(29,868	)
Net deferred tax assets	$	309		$	313
Deferred tax liabilities:
Acquired intangible assets	$	(183	)	$	(301	)
Fixed assets depreciation		(126	)		(12	)
Gross deferred tax liabilities	$	(309	)	$	(313	)
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, 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
(Decrease) related to prior year positions		—
Increase related to current year tax positions		598
Balance at January 31, 2017	$	1,815

Commitments and Contingencies (Tables)

12 Months Ended

Jan. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Minimum Rental Commitments under Non-Cancelable Operating Leases

As of January 31, 2017, future minimum rental commitments under non-cancelable operating leases were as follows (in thousands):

	Operating
Fiscal Year Ending January 31,	Leases
2018	$	1,297
2019		71
2020		23
2021		10
Total	$	1,401

Acquisitions (Tables)

12 Months Ended

Jan. 31, 2017

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, 2017

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):

	Fiscal Year Ended January 31,
	2017			2016			2015
Numerator
Net loss	$	(12,949	)	$	(14,052	)	$	(6,410	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		17,490,448			10,173,095			2,284,241
Basic and diluted net loss per share	$	(0.74	)	$	(1.38	)	$	(2.81	)

Potential Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share

	Fiscal Year Ended January 31,
	2017		2016		2015
Options to purchase common stock		1,777,365		2,087,584		1,893,239
Employee stock purchase plan		338,756		381,066		—
Convertible preferred stock		—		—		8,353,748
Restricted stock units		1,859,196		1,056,905		—
Warrants to purchase convertible preferred stock		—		—		192,009
Warrants to purchase common stock		97,931		97,931		87,828
Common stock subject to repurchase		53,821		173,404		502,359
Potential shares excluded from diluted net loss per share		4,127,069		3,796,890		11,029,183

Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)		1 Months Ended		12 Months Ended
	Jul. 06, 2015	Jan. 31, 2017 USD ($) Customer $ / shares shares	Jul. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2017 USD ($) Segment Customer $ / shares shares	Jan. 31, 2016 USD ($) Customer shares	Jan. 31, 2015 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Reverse stock split ratio	0.5
Common stock, shares issued \| shares		17,995,555		17,995,555	16,916,250
Proceeds from offering				$ 1,477,000	$ 221,000	$ 423,000
Reportable segments \| Segment				1
Unrealized (loss) gain				$ (28,000)	$ 17,000
Number of customers that individually exceeded 10% of revenue \| Customer				0	0	0
Allowance for doubtful accounts and allowance for returns		$ 200,000		$ 200,000	$ 0
Goodwill		$ 1,117,000		1,117,000	1,117,000
Impairment of long-lived assets				$ 0	$ 0	$ 0
Warrants to purchase convertible preferred stock outstanding \| shares		0		0	0
Convertible preferred stock warrant liability settled				$ 600,000
Advertising costs				300,000	$ 500,000	800,000
Accounting Standard Update ("ASU") 2016-09
Summary Of Significant Accounting Policies [Line Items]
Cumulative-effect adjustment to accumulated deficit and additional paid-in capital		$ 100,000		100,000
Sales and marketing
Summary Of Significant Accounting Policies [Line Items]
Advertising costs				16,500,000	13,900,000	14,800,000
Talkatone
Summary Of Significant Accounting Policies [Line Items]
Goodwill						$ 1,100,000
Impairment on goodwill				$ 0	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				$ 400,000	$ 500,000
Customer Concentration Risk \| Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of customers \| Customer		1		1	1
Common Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock shares sold \| shares					5,000,000
Initial Public Offering
Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued \| shares			5,000,000
Public offering price \| $ / shares			$ 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
Secondary Offering
Summary Of Significant Accounting Policies [Line Items]
Proceeds from offering		$ 0
Secondary Offering \| Common Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock shares sold \| shares		3,275,000
Common stock shares sold, public offering price \| $ / shares		$ 8.65		$ 8.65
Overallotment Option \| Common Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock shares sold \| shares		425,000

Description of Business and Summary of Significant Accounting Policies - Concentration of Accounts Receivable (Details) - Accounts Receivable - Customer Concentration Risk	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Customer A
Concentration Risk [Line Items]
Concentration risk percentage	11.00%
Customer B
Concentration Risk [Line Items]
Concentration risk percentage		13.00%

Fair Value Measurement - Schedule of Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Assets:
Total cash and cash equivalents	$ 3,990	$ 27,413
Total short-term investments	49,211	27,991
Liabilities:
Total liabilities		288
U.S. Government Securities
Assets:
Total short-term investments	17,798	7,494
Corporate Debt Securities
Assets:
Total short-term investments	18,436	7,845
Commercial Paper
Assets:
Total short-term investments	5,386	4,986
U.S. Agency Securities
Assets:
Total short-term investments	5,777	7,666
Asset-backed Securities
Assets:
Total short-term investments	1,814
Cash Equivalents
Assets:
Total cash and cash equivalents	951	6,961
Cash Equivalents \| Money Market Funds
Assets:
Total cash and cash equivalents	951	3,462
Cash Equivalents \| Commercial Paper
Assets:
Total cash and cash equivalents		3,499
Cash
Assets:
Total cash and cash equivalents	3,039	20,452
Acquisition-Related Contingent Consideration
Liabilities:
Total liabilities		288
Level 1
Assets:
Total short-term investments	17,798	7,494
Level 1 \| U.S. Government Securities
Assets:
Total short-term investments	17,798	7,494
Level 1 \| Cash Equivalents
Assets:
Total cash and cash equivalents	951	3,462
Level 1 \| Cash Equivalents \| Money Market Funds
Assets:
Total cash and cash equivalents	951	3,462
Level 2
Assets:
Total short-term investments	31,413	20,497
Level 2 \| Corporate Debt Securities
Assets:
Total short-term investments	18,436	7,845
Level 2 \| Commercial Paper
Assets:
Total short-term investments	5,386	4,986
Level 2 \| U.S. Agency Securities
Assets:
Total short-term investments	5,777	7,666
Level 2 \| Asset-backed Securities
Assets:
Total short-term investments	$ 1,814
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
Level 3 \| Acquisition-Related Contingent Consideration
Liabilities:
Total liabilities		$ 288

Fair Value Measurement - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Fair Value Disclosures [Line Items]
Transfers into or out of the Level 3 category	$ 0	$ 0
Fair value of liabilities		288,000
Acquisition-related contingent consideration reduction in expense		281,000	$ (656,000)
Payout of consideration in shares of common stock	165,000	451,000	$ 338,000
Level 3
Fair Value Disclosures [Line Items]
Fair value of liabilities		288,000
Acquisition-Related Contingent Consideration
Fair Value Disclosures [Line Items]
Fair value of liabilities		288,000
Acquisition-Related Contingent Consideration \| Level 3
Fair Value Disclosures [Line Items]
Fair value of liabilities		$ 288,000
Acquisition-related contingent consideration reduction in expense	123,000
Payout of consideration in shares of common stock	$ 165,000

Fair Value Measurement - Schedule of Changes in Level 3 Fair Value Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	$ 288
Payout of consideration		$ (281)	$ 656
Issuance of shares	(165)	(451)	$ (338)
Ending Balance		288
Acquisition-Related Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	288
Ending Balance		288
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	288
Ending Balance		288
Level 3 \| Acquisition-Related Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	288
Payout of consideration	(123)
Issuance of shares	$ (165)
Ending Balance		$ 288

Short-term Investments - Summary of Short-term Investment (Details) - Short-term Investments - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	$ 49,222	$ 27,974
Short-term Investments, Unrealized Losses	(22)	(6)
Short-term Investments, Unrealized Gains	11	23
Short-term Investments, Fair Value	49,211	27,991
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	18,455	7,851
Short-term Investments, Unrealized Losses	(20)	(6)
Short-term Investments, Unrealized Gains	1
Short-term Investments, Fair Value	18,436	7,845
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	5,386	4,985
Short-term Investments, Unrealized Gains		1
Short-term Investments, Fair Value	5,386	4,986
U.S. Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	5,774	7,661
Short-term Investments, Unrealized Gains	3	5
Short-term Investments, Fair Value	5,777	7,666
US Government Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	17,793	7,477
Short-term Investments, Unrealized Losses	(2)
Short-term Investments, Unrealized Gains	7	17
Short-term Investments, Fair Value	17,798	$ 7,494
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	1,814
Short-term Investments, Fair Value	$ 1,814

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

Short-term Investments - Schedule of Cost Basis and Fair Value of Short-term Investments by Contractual Maturity (Details) - Short-term Investments - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
One year or less, amortized cost	$ 44,806	$ 19,143
Over one year and less than two years, amortized cost	4,416	8,831
Short-term Investments, Amortized Cost	49,222	27,974
One year or less, fair value	44,794	19,145
Over one year and less than two years, fair value	4,417	8,846
Short-term Investments, Fair Value	$ 49,211	$ 27,991

Short-term Investments - Schedule of Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	$ 36,234	$ 7,845
Investments, Unrealized Losses	(22)	(6)
Corporate Debt Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	18,436	7,845
Investments, Unrealized Losses	(20)	$ (6)
US Government Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	17,798
Investments, Unrealized Losses	$ (2)

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, 2017	Jan. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 2,208	$ 2,208
Accumulated Amortization	(1,671)	(1,323)
Net Carrying Amount	537	885
Developed technology
Finite Lived Intangible Assets [Line Items]
Gross Value	815	815
Accumulated Amortization	(448)	(285)
Net Carrying Amount	$ 367	530
Estimated Life (in years)	5 years
User relationships
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 458	458
Accumulated Amortization	(360)	(229)
Net Carrying Amount	$ 98	229
Estimated Life (in years)	3 years 6 months
Trade name
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 103	103
Accumulated Amortization	(56)	(36)
Net Carrying Amount	$ 47	67
Estimated Life (in years)	5 years
Non-compete agreement
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 118	118
Accumulated Amortization	$ (118)	(104)
Net Carrying Amount		14
Estimated Life (in years)	2 years
Patents and licenses
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 714	714
Accumulated Amortization	(689)	(669)
Net Carrying Amount	$ 25	$ 45
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, 2017	Jan. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
2018	$ 291
2019	190
2020	53
2021	3
Net Carrying Amount	$ 537	$ 885

Balance Sheet Components - Components of Inventories (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 4,847	$ 4,633
Raw material	983	378
Total inventory	$ 5,830	$ 5,011

Balance Sheet Components - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 16,030	$ 15,072
Less: current portion of deferred revenue	15,521	15,036
Deferred revenue, noncurrent portion included in other long-term liabilities	509	36
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	13,770	11,954
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 2,260	$ 3,118

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References + Details

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

Balance Sheet Components - Components of Property And Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment	$ 9,462	$ 9,926
Less: accumulated depreciation and amortization	(5,286)	(5,635)
Property and equipment, net	4,176	4,291
Software and Computer Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	5,605	6,615
Less: accumulated depreciation and amortization	$ (1,900)
Website Development Costs
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	2 years
Total property and equipment	$ 1,973	1,675
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	3 years
Total property and equipment	$ 1,304	1,207
Office Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	5 years
Total property and equipment	$ 62	57
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	$ 518	$ 372
Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	3 years
Minimum \| Software and Computer Equipment
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
Maximum \| Software and Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, estimated life	4 years

Balance Sheet Components - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 1,600,000	$ 1,400,000	$ 900,000
Write off of property and equipment	0	0	$ 0
Accumulated depreciation	5,286,000	5,635,000
Software and Computer Equipment
Property Plant And Equipment [Line Items]
Write off of property and equipment	1,900,000
Accumulated depreciation	1,900,000
Software and Computer Equipment \| Other Expense, Net
Property Plant And Equipment [Line Items]
Loss due to write off of property and equipment	14,000
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment under capital lease agreement	$ 0	1,500,000
Accumulated depreciation of property and equipment under capital lease agreement		$ 500,000

Balance Sheet Components - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Payables And Accruals [Abstract]
Accrued regulatory fees and taxes	$ 4,315	$ 5,216
Accrued payroll and related expenses	4,546	3,559
Acquisition-related contingent consideration		288
Other accrued expenses	2,718	3,947
Total accrued expenses	$ 11,579	$ 13,010

Debt - Additional Information (Details) - USD ($)	1 Months Ended						12 Months Ended
Debt - Additional Information (Details) - USD ($)	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2015	Jul. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015	Jun. 30, 2009
Debt Instrument [Line Items]
Warrant to purchase convertible preferred stock			76,630						76,630	55,696
Exercise price per share of warrants			$ 6.04				$ 4.70		$ 6.04
Warrants, exercisable date			2025-01
Short term debt of equipment acquired under capital lease							$ 0	$ 632,000
Interest expense							18,000	900,000	$ 300,000
Amortization of debt issuance costs							$ 0	100,000	100,000
Write-off of non-cash deferred debt issuance costs								$ 332,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity period					2014-12
Debt instrument, maturity description							The Revolver matured in August 2016.
Debt instrument, extended maturity period	2016-08			2016-07
Interest rate					2.75%
Revolving credit line			$ 12,000,000		$ 6,000,000				12,000,000
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 outstanding balance		$ 5,300,000
New Line Of Credit
Debt Instrument [Line Items]
Repayment of outstanding balance		$ 5,000,000
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

Convertible Preferred Stock Warrant Liability - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended	12 Months Ended
	Jul. 31, 2015	Oct. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	Jan. 31, 2017	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015	Dec. 31, 2010	Jun. 30, 2009
Class Of Stock [Line Items]
Warrants to purchase convertible preferred stock outstanding					0	0	0
Exercise price per share of warrants					$ 4.70	$ 4.70		$ 6.04
Payment for warrant holders	$ 0.6
Warrant to purchase convertible preferred stock								76,630		55,696
Warrants issued to purchase convertible preferred stock		66,026	66,026	66,026
Warrant conversion ratio	100.00%
Conversion of warrants to common stock					66,026
Warrants exercised, net					21,421
Initial Public Offering
Class Of Stock [Line Items]
Public offering price	$ 13.00
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
Aggregate liability	$ 0.4
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
Aggregate liability	$ 0.7
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

Common Stock and Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Common Stock And Preferred Stock [Line Items]
Preferred stock, shares outstanding		0	0
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, par value	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Preferred stock, par value	$ 0.0001	$ 0.0001	$ 0.0001
Common stock options early exercised prior to vesting dates		1,771	0	131,810
Shares excluded from common stock outstanding for early exercise of common stock		53,821	173,404
Accrued expenses and other liabilities		$ 0.1	$ 0.2
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 and Series Alpha -1 preferred stock
Common Stock And Preferred Stock [Line Items]
Stock conversion ratio	100.00%
Series Alpha 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
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

Common Stock and Preferred Stock - Schedule of Common Stock Reserved for Issuance (Details) - shares	Jan. 31, 2017	Jan. 31, 2016
Common Stock And Preferred Stock [Line Items]
Total shares reserved for issuance	5,185,349	4,922,420
Warrants to purchase common stock
Common Stock And Preferred Stock [Line Items]
Total shares reserved for issuance	97,931	97,931
Options to purchase common stock
Common Stock And Preferred Stock [Line Items]
Total shares reserved for issuance	1,777,365	2,087,584
Shares available for future issuance under stock plans
Common Stock And Preferred Stock [Line Items]
Total shares reserved for issuance	918,260	1,254,404
Shares reserved under Employee Stock Purchase Plan
Common Stock And Preferred Stock [Line Items]
Total shares reserved for issuance	532,597	425,596
Restricted stock units outstanding
Common Stock And Preferred Stock [Line Items]
Total shares reserved for issuance	1,859,196	1,056,905

Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2015 shares	Apr. 30, 2016 shares	Jan. 31, 2017 USD ($) Peroid $ / shares shares	Jan. 31, 2016 USD ($) $ / shares shares	Jan. 31, 2015 USD ($) $ / shares shares
Stockholders Equity Note Disclosure [Line Items]
Common stock available for future issuance			5,185,349	4,922,420
Stock-based compensation \| $			$ 9,772	$ 4,653	$ 426
Exercise price per share of warrants \| $ / shares			$ 4.70		$ 6.04
Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Shares of common stock			97,931
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
Stock Options
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $			$ 2,468	2,607	$ 426
Employee stock option expiration period			10 years
Aggregate intrinsic value of vested options exercised \| $			$ 1,300	$ 800	$ 500
Weighted-average grant date fair value of options granted \| $ / shares				$ 6.92	$ 5.20
Stock option, granted			0
Stock Options \| 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 \| $			$ 6,272	$ 1,644
Employee stock option vesting period			1 year 4 months 24 days	1 year 4 months 24 days
Number of Shares, RSUs granted			1,596,750		0
Shares repurchased for tax withholdings on vesting of RSUs			170,281
Payment for shares withheld for tax withholdings on vesting of RSUs \| $			$ 1,588
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
ESPP
Stockholders Equity Note Disclosure [Line Items]
Increase in number of shares of common stocks issued under the plan		341,793
Maximum shares of common stock initially authorized for 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 of common stock issued under ESPP			234,792	15,569
Weighted purchase price of shares of common stock under ESPP \| $ / shares			$ 5.01	$ 7.12
Stock-based compensation \| $			$ 1,032	$ 402
2015 Equity Incentive Plan
Stockholders Equity Note Disclosure [Line Items]
Maximum aggregate number of shares issued under the plan	6,638,930
Percentage of common stock outstanding	5.00%
Increase in number of shares of common stocks issued under the plan		854,483
Common stock available for future issuance			918,260

Stockholders' Equity - Summarizes of Stock Option Activities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Number of Shares
Number of Shares, Beginning balance	2,087,584
Number of Shares, Options exercised	(213,164)
Number of Shares, Options canceled	(97,055)
Number of Shares, Ending balance	1,777,365	2,087,584
Number of Shares, Vested and exercisable	1,069,258
Number of Shares, Vested and expected to vest	1,777,365
Weighted Average Exercise Price Per Share
Weighted Average Exercise Price Per Share, Beginning balance	$ 5.59
Weighted Average Exercise Price Per Share, Options exercised	1.43
Weighted Average Exercise Price Per Share, Options canceled	12.06
Weighted Average Exercise Price Per Share, Ending balance	5.74	$ 5.59
Weighted Average Exercise Price Per Share, Vested and exercisable	4.63
Weighted Average Exercise Price Per Share, Vested and expected to vest	$ 5.74
Weighted Average Contractual Term
Weighted Average Contractual Term	7 years	7 years 10 months 24 days
Weighted Average Contractual Term, Vested and exercisable	6 years 4 months 24 days
Weighted Average Contractual Term, Vested and expected to vest	7 years
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 7,864	$ 4,843
Aggregate Intrinsic Value, Vested and exercisable	5,776
Aggregate Intrinsic Value, Vested and expected to vest	$ 7,864

Stockholders' Equity - Summarizes of Restricted Stock Units Activities (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Number of Shares
Number of Shares, RSUs Beginning Balance	1,056,905
Number of Shares, RSUs granted	1,596,750		0
Number of Shares, RSUs vested	(657,034)
Number of Shares, RSUs canceled	(137,425)
Number of Shares, RSUs Ending Balance	1,859,196	1,056,905
Weighted Average Grant-Date Fair Value Per Share
Weighted Average Grant-Date Fair Value Per Share, Beginning Balance	$ 9.60
Weighted Average Grant-Date Fair Value Per Share, RSUs granted	7.25
Weighted Average Grant-Date Fair Value Per Share, RSUs vested	8.76
Weighted Average Grant-Date Fair Value Per Share, RSUs canceled	8.01
Weighted Average Grant-Date Fair Value Per Share, Ending Balance	$ 7.65	$ 9.60
Weighted Average Remaining Vesting Period
Weighted Average Remaining Vesting Period	1 year 4 months 24 days	1 year 4 months 24 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 17,941	$ 7,176

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, 2017	Jan. 31, 2016	Jan. 31, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 9,772	$ 4,653	$ 426
Total cost of revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,026	437	36
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,438	611	41
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	3,586	1,683	169
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 3,722	$ 1,922	$ 180

Stock-Based Compensation - Stock-Based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 9,772	$ 4,653	$ 426
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	2,468	2,607	$ 426
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	6,272	1,644
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 1,032	$ 402

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	109,315	70,199
Stock-based compensation	$ 9,772	$ 4,653	$ 426
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 3,200
Stock-based compensation expenses recognized on straight line basis offering period	1 year 7 months 6 days
Stock-based compensation	$ 2,468	2,607	$ 426
Number of shares underlying outstanding options, options granted	0
Stock Options \| Non Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 100	$ 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	$ 12,500
Stock-based compensation expenses recognized on straight line basis offering period	2 years 8 months 12 days
Non employee stock options outstanding	1,859,196	1,056,905
Stock-based compensation	$ 6,272	$ 1,644
Restricted Stock Units (RSUs) \| Non Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	73,453	70,500
Stock-based compensation	$ 200	$ 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	$ 1,000
Stock-based compensation expenses recognized on straight line basis offering period	10 months 24 days
Stock-based compensation	$ 1,032	$ 402
Number of ESPP granted		0

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Options Grants Using Black-Scholes Option Pricing Model (Details) - Stock Options	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	54.00%	69.00%
Risk-free interest rate, minimum	1.60%	1.50%
Expected volatility, maximum	62.00%	81.00%
Risk-free interest rate, maximum	1.90%	2.00%
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
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

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of ESPP Using Black-Scholes Option Pricing Model (Details) - ESPP	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	37.00%	35.00%
Risk-free interest rate, minimum	0.50%	0.10%
Expected volatility, maximum	50.00%	44.00%
Risk-free interest rate, maximum	1.00%	0.80%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	6 months
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years	2 years 2 months 12 days

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Tax [Line Items]
Federal statutory income tax rate	34.00%	34.00%	34.00%
Valuation allowance for deferred tax assets	$ 34,900,000	$ 29,868,000	$ 25,800,000
Net change in valuation allowance	$ 5,000,000
Net operating loss carryforwards, expired	2030
Unrecognized tax benefits	$ 1,815,000	1,217,000	$ 1,029,000
Interest expense or penalties related to unrecognized tax benefits	$ 0	$ 0
Research and Development
Income Tax [Line Items]
Federal tax credit, expired	2030
Federal
Income Tax [Line Items]
Net operating loss carryforwards	$ 72,900,000
Federal \| Research and Development
Income Tax [Line Items]
Tax credit carryforwards	2,400,000
State
Income Tax [Line Items]
Net operating loss carryforwards	57,500,000
State \| Research and Development
Income Tax [Line Items]
Tax credit carryforwards	$ 2,100,000

Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax at statutory rate	$ (4,403)	$ (4,787)	$ (2,350)
Change in valuation allowance	4,881	4,502	2,132
State taxes	(230)	(261)	(437)
Stock-based compensation	387	691	92
Research and development credit	(738)	(273)	(192)
Permanent tax adjustment	$ 103	$ 128	23
Other			230
Total			$ (502)
Federal tax at statutory rate, Rate	34.00%	34.00%	34.00%
Change in valuation allowance, Rate	(38.00%)	(32.00%)	(31.00%)
State taxes, Rate	2.00%	2.00%	6.00%
Stock-based compensation, Rate	(3.00%)	(5.00%)	(1.00%)
Research and development credit, Rate	6.00%	2.00%	3.00%
Permanent tax adjustment, Rate	(1.00%)	(1.00%)
Other, Rate			(3.00%)
Total, Rate			8.00%

Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Deferred tax assets:
Accruals and reserves	$ 2,623	$ 2,297
Stock-based compensation	1,887	1,334
Intangible assets amortization	101	110
Deferred revenue	182	13
Net operating loss carry forwards	28,120	24,869
Tax credit carryover	2,296	1,558
Gross deferred tax assets	35,209	30,181
Valuation allowance	(34,900)	(29,868)	$ (25,800)
Net deferred tax assets	309	313
Deferred tax liabilities:
Acquired intangible assets	(183)	(301)
Fixed assets depreciation	(126)	(12)
Gross deferred tax liabilities	$ (309)	$ (313)

Income Taxes - Summary of Activity Related to UTBs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
Balance at January 31, 2015	$ 1,217	$ 1,029
(Decrease) related to prior year positions		(16)
Increase related to current year tax positions	598	204
Balance at January 31, 2016	$ 1,815	$ 1,217

Retirement Plan - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
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%
Compensation costs	$ 400,000	$ 300,000	$ 200,000

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Operating Leased Assets [Line Items]
Rent expense		$ 2,000,000	$ 1,700,000	$ 900,000
Non-cancelable purchase commitments		$ 4,000,000
Palo Alto and Newark Facility
Operating Leased Assets [Line Items]
Operating lease expiration date		2020-11
Lease Agreement One
Operating Leased Assets [Line Items]
Capital lease of computer equipment maturity date	2016-12
Right to purchase the equipment, amount	$ 1
Payments of capital lease obligations		$ 600,000

Commitments and Contingencies - Minimum Rental Commitments under Non-Cancelable Operating Leases (Details) $ in Thousands	Jan. 31, 2017 USD ($)
Operating Leases
2018	$ 1,297
2019	71
2020	23
2021	10
Total	$ 1,401

Acquisitions - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Business Acquisition [Line Items]
Amortization of intangible assets	$ 348,000	$ 393,000	$ 306,000
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	$ 100,000	$ 700,000
Earn-out consideration, shares issued	26,375	49,159
Amortization of intangible assets	$ 300,000	$ 400,000	$ 200,000

Acquisitions - Components of Total Consideration (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	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	$ 165	$ 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, 2017	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, 2017	Jan. 31, 2016	Jan. 31, 2015
Numerator
Net loss	$ (12,949)	$ (14,052)	$ (6,410)
Denominator
Weighted-average common shares for basic and diluted net loss per share	17,490,448	10,173,095	2,284,241
Basic and diluted net loss per share	$ (0.74)	$ (1.38)	$ (2.81)

Net Loss Per Share - Potential Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	4,127,069	3,796,890	11,029,183
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	338,756	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	1,777,365	2,087,584	1,893,239
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	1,859,196	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
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	53,821	173,404	502,359
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
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	97,931	87,828

Related Party Transaction - Additional Information (Details) $ in Millions	12 Months Ended
	Jan. 31, 2017 USD ($)
One of Board of Director
Related Party Transaction [Line Items]
Public relations service fee	$ 0.3

Subsequent Events - Additional Information (Details) - USD ($)	1 Months Ended		12 Months Ended
	Mar. 31, 2017	Jan. 31, 2017	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Subsequent Event [Line Items]
Proceeds from offering			$ 1,477,000	$ 221,000	$ 423,000
Secondary Offering
Subsequent Event [Line Items]
Proceeds from offering		$ 0
Common Stock
Subsequent Event [Line Items]
Common stock shares sold				5,000,000
Common Stock \| Secondary Offering
Subsequent Event [Line Items]
Common stock shares sold		3,275,000
Common stock shares sold, public offering price		$ 8.65	$ 8.65
Common Stock \| Overallotment Option
Subsequent Event [Line Items]
Common stock shares sold		425,000
Subsequent Event \| Secondary Offering
Subsequent Event [Line Items]
Proceeds from offering	$ 0
Subsequent Event \| Overallotment Option
Subsequent Event [Line Items]
Common stock shares sold	429,193
Subsequent Event \| Common Stock \| Secondary Offering
Subsequent Event [Line Items]
Common stock shares sold	3,290,483
Common stock shares sold, public offering price	$ 8.85
Subsequent Event \| Maximum \| Worldview Technology Partners \| Secondary Offering
Subsequent Event [Line Items]
Percentage of outstanding voting securities owned	1.00%