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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jul. 31, 2016	Aug. 31, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2016
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Trading Symbol	OOMA
Entity Registrant Name	Ooma Inc
Entity Central Index Key	0001327688
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		17,403,580

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 6,712	$ 27,413
Short-term investments	47,126	27,991
Accounts receivable, net	4,478	5,609
Inventories	4,564	5,011
Deferred inventory costs	2,037	2,013
Prepaid expenses and other current assets	1,637	1,318
Total current assets	66,554	69,355
Property and equipment, net	4,478	4,291
Intangible assets, net	703	885
Goodwill	1,117	1,117
Other assets	307	888
Total assets	73,159	76,536
Current liabilities:
Accounts payable	5,493	4,786
Accrued expenses	10,805	13,010
Short-term capital lease		632
Deferred revenue	15,134	15,036
Total current liabilities	31,432	33,464
Other liabilities	225	182
Total liabilities	31,657	33,646
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock
Common stock	2	2
Additional paid-in capital	113,562	107,679
Accumulated other comprehensive income	42	17
Accumulated deficit	(72,104)	(64,808)
Total stockholders’ equity	41,502	42,890
Total liabilities and stockholders’ equity	$ 73,159	$ 76,536

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares	Jul. 31, 2016	Jan. 31, 2016	Jul. 06, 2015
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	100,000,000	100,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	17,399,272	16,916,250
Common stock, shares outstanding	17,399,272	16,916,250

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Revenue:
Subscription and services	$ 22,417	$ 17,449	$ 43,907	$ 33,025
Product and other	3,077	3,687	6,046	7,963
Total revenue	25,494	21,136	49,953	40,988
Cost of revenue:
Subscription and services	7,444	6,310	14,715	11,934
Product and other	3,501	3,583	7,040	7,790
Total cost of revenue	10,945	9,893	21,755	19,724
Gross profit	14,549	11,243	28,198	21,264
Operating expenses:
Sales and marketing	8,578	6,813	16,673	12,708
Research and development	5,839	4,284	11,580	8,381
General and administrative	3,545	3,206	7,400	6,167
Total operating expenses	17,962	14,303	35,653	27,256
Loss from operations	(3,413)	(3,060)	(7,455)	(5,992)
Other income (expense):
Interest income (expense), net	100	(607)	164	(892)
Change in fair value of warrants		274		(442)
Other (expense) income, net	(27)	(10)	(5)	(12)
Net loss	$ (3,340)	$ (3,403)	$ (7,296)	$ (7,338)
Net loss per share of common stock:
Basic and diluted	$ (0.19)	$ (0.80)	$ (0.42)	$ (2.14)
Weighted-average number of shares used in per share amounts:
Basic and diluted	17,280,985	4,233,193	17,180,671	3,422,521

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (3,340)	$ (3,403)	$ (7,296)	$ (7,338)
Other comprehensive income
Unrealized gain on short-term investments, net	12		25
Comprehensive loss	$ (3,328)	$ (3,403)	$ (7,271)	$ (7,338)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Cash flows from operating activities:
Net loss	$ (7,296)	$ (7,338)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	4,873	1,289
Depreciation and amortization	822	670
Amortization of intangible assets	182	197
Write-off of non-cash deferred debt issuance costs		332
Other non-cash (income) expense, net	(3)	64
Change in fair value of acquisition-related contingent consideration		124
Change in fair value of warrant liability		442
Changes in operating assets and liabilities:
Accounts receivable, net	1,131	(529)
Inventories	447	860
Deferred inventory costs	(24)	558
Prepaid expenses and other assets	217	(178)
Accounts payable and accrued expenses	(1,087)	3,293
Other liabilities	(22)	(62)
Deferred revenue	176	(372)
Net cash used in operating activities	(584)	(650)
Cash flows from investing activities:
Purchases of short-term investments	(33,115)
Proceeds from maturity of short-term investments	10,950
Proceeds from sale of short-term investments	3,016
Purchases of property and equipment	(1,030)	(866)
Net cash used in investing activities	(20,179)	(866)
Cash flows from financing activities:
Proceeds from initial public offering, net		58,848
Repayment of debt and capital leases	(628)	(11,294)
Payment of acquisition related earn-out	(100)	(475)
Payment of preferred warrant liability		(584)
Proceeds from issuance of common stock related to warrants and employee stock benefit plans	790	61
Net cash provided by financing activities	62	51,556
Net (decrease) increase in cash and cash equivalents	(20,701)	50,040
Cash and cash equivalents at beginning of period	27,413	9,133
Cash and cash equivalents at end of period	$ 6,712	59,173
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

6 Months Ended

Jul. 31, 2016

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

Basis of Presentation

These unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended January 31, 2016.

These financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all normal recurring adjustments necessary to present fairly the Company’s financial position, its results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2017. The condensed consolidated balance sheet as of January 31, 2016 included herein was derived from the audited financial statements as of that date.

The condensed consolidated financial statements include accounts of the Company and its wholly-owned subsidiary. All significant intercompany transactions and balances have been eliminated upon consolidation.

Reverse Stock Split

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

Initial Public Offering and Conversion of Preferred Stock

In July 2015, the Company completed its initial public offering (the “IPO”), in which 5,000,000 shares of common stock were sold to the public at an IPO price of $13.00 per share. The net proceeds from the offering were $56.9 million after deducting the underwriters’ discounts and commissions of $4.5 million and $3.6 million of offering expenses.

Use of Estimates

The preparation of the Company’s condensed 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 condensed 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, 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.

Summary of Significant Accounting Policies

There have been no material changes to the Company's significant accounting policies as described in its Annual Report on Form 10-K for the year ended January 31, 2016.

Concentration of Risk

The concentration of accounts receivable as of July 31, 2016 and January 31, 2016, respectively are as follows:

As of

July 31,

2016

January 31,

2016

Customer A

16%

13%

There were no customers that individually exceeded 10% of revenue during the three and six months ended July 31, 2016 and 2015.

Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standard Board (“FASB”) issued accounting standards update (“ASU”) 2016-13, Measurement of Credit Losses on Financial Instruments, which improves financial reporting by providing timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. This ASU requires an organization to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Additionally, the new standard amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. ASU 2016-13 will become effective for the Company in the first quarter of fiscal 2021. Early adoption is permitted. The Company is currently evaluating the 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 affects entities that issue share-based payment awards to their employees. The ASU is designed to simplify several aspects of accounting for share-based payment award transactions which include – the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows and forfeiture rate calculations. ASU 2016-09 will become effective for the Company in the first quarter of fiscal 2018. Early adoption is permitted in any interim or annual period. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

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

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

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

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

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which affects any entity that either enters into contracts with customers to transfer goods and services or enters into contracts for the transfer of nonfinancial assets. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the currently effective guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. In July 2015, the FASB approved a one-year deferral of the effective date of the standard with the issuance of by ASU 2015-14, Revenue from Contracts with Customers (ASC 606) Deferral of Effective Date. As a result, ASU 2014-09 will become effective for the Company in the first quarter of fiscal 2019 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. Early adoption is permitted but not before the original effective date of annual periods beginning after December 15, 2016. In April 2016 and May 2016, the FASB issued ASU 2016-10 and ASU 2016-12, respectively, which clarifies guidance on identifying performance obligations, collectability criterion and noncash consideration. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

Fair Value Measurement

6 Months Ended

Jul. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurement

2. Fair Value Measurement

The Company records its financial assets and liabilities at fair value. The inputs used in the valuation methodologies in measuring fair value are defined in the fair value hierarchy as follows:

Level 1:

Quoted prices (unadjusted) in active markets that are accessible at the measurement date for identical assets or liabilities.

Level 2:

Observable prices that are based on inputs not quoted on active markets, but corroborated by market data.

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 and which reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

The Company’s financial instruments consist of Level 1, Level 2 assets and Level 3 liabilities.

As of January 31, 2016, the Level 3 liabilities consisted of acquisition-related contingent consideration. During the first quarter of fiscal 2017, this liability was settled in cash and issuance of shares of common stock.

There were no transfers into or out of the Level 3 category during the six months ended July 31, 2016.

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 July 31, 2016
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	2,970	$	—	$	—	$	2,970
Total cash equivalents	$	2,970	$	—	$	—	$	2,970
Cash								3,742
Total Cash and cash equivalents							$	6,712

Short-term investments:
Corporate debt securities	$	—	$	10,408	$	—	$	10,408
Commercial paper		—		10,122		—		10,122
U.S. agency securities		7,625		—		—		7,625
U.S. government securities		17,170		—		—		17,170
Asset-backed securities		—		1,801		—		1,801
Total short-term investments	$	24,795	$	22,331	$	—	$	47,126

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

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

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

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 July 31, 2016	$	—

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

6 Months Ended

Jul. 31, 2016

Investments Debt And Equity Securities [Abstract]

Short-term Investments

3. Short-term Investments

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

	As of July 31, 2016
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	10,408	$	(3	)	$	3	$	10,408
Commercial paper		10,122		—			—		10,122
U.S. agency securities		7,613		—			12		7,625
U.S. government securities		17,140		—			30		17,170
Asset-backed securities		1,801		—			—		1,801
Total short-term investments	$	47,084	$	(3	)	$	45	$	47,126

	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 three and six months ended July 31, 2016. The Company did not have any gross realized gains or gross realized losses for the three and six months ended July 31, 2015.

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

	As of July 31, 2016				As of January 31, 2016
	Amortized Value		Fair Value		Amortized Value		Fair Value
One year or less	$	39,357	$	39,375	$	19,143	$	19,145
Over one year and less than two years		7,727		7,751		8,831		8,846
Total	$	47,084	$	47,126	$	27,974	$	27,991

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

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

	As of July 31, 2016					As of January 31, 2016
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	10,408	$	(3	)	$	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 July 31, 2016 and January 31, 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.

Balance Sheet Components

6 Months Ended

Jul. 31, 2016

Balance Sheet Components [Abstract]

Balance Sheet Components

4. Balance Sheet Components

Inventories

The components of inventories were as follows (in thousands):

	July 31,		January 31,
	2016		2016
Finished goods	$	4,162	$	4,633
Raw material		402		378
Total inventory	$	4,564	$	5,011

Deferred Revenue

The components of deferred revenue were as follows (in thousands):

	July 31,		January 31,
	2016		2016
Deferred revenue:
Subscription and services	$	12,771	$	11,954
Product and other		2,477		3,118
Total deferred revenue		15,248		15,072
Less: current portion of deferred revenue		15,134		15,036
Deferred revenue, noncurrent portion included in other liabilities	$	114	$	36

Accrued Expenses

The components of accrued expenses were as follows (in thousands):

	July 31,		January 31,
	2016		2016
Accrued regulatory fees and taxes	$	4,921	$	5,216
Accrued payroll and related expenses		3,286		3,559
Acquisition-related contingent consideration-current portion		—		288
Other accrued expenses		2,598		3,947
Total accrued expenses	$	10,805	$	13,010

Debt	6 Months Ended
Debt	Jul. 31, 2016
Debt Disclosure [Abstract]
Debt	5. Debt In April 2012, the Company entered into a secured debt agreement (“Term Debt”) with its current lender, with original maturity of September 2015. In December 2012, the Company amended the secured debt agreement, adding a revolving line of credit (“the Revolver”) with original maturity of December 2014. 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 paid off the outstanding balance of $5.3 million under the Term Debt and the Revolver using a portion of the IPO proceeds. Effective as of July 21, 2016, the Company entered into an amended agreement to extend the maturity of the Revolver to 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 term loan (“Term Loan”) of up to $10.0 million. The original maturity date of the Term Loan was January 2018. 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 July 31, 2016, these warrants remained outstanding. In July 2015, the Company repaid the outstanding Term Loan of $5.0 million using a portion of the IPO proceeds. As of July 31, 2016, the amount available under the Revolver agreement was $12.0 million. The interest rate on the Revolver is 2.75% above the prime rate (3.5% at July 31, 2016). The Revolver includes a financial covenant in which the Company is required to have a certain number of subscribers at the end of each quarter. Additionally, the Company has certain non-financial covenants in connection with the borrowings. As of July 31, 2016 and January 31, 2016, the Company was in compliance with all the covenants under the Revolver agreement. Total interest expense recognized was zero and $0.6 million for the three months ended July 31, 2016 and 2015, respectively, and $18,000 and $0.9 million for the six months ended July 31, 2016 and 2015, respectively. Total amortization of debt issuance costs recognized was zero and $20,000 for the three months ended July 31, 2016 and 2015, respectively, and zero and $64,000 for the six months ended July 31, 2016 and 2015, respectively. Interest expense for the three and six months ended July 31, 2015 also included $0.3 million write-off of non-cash deferred issuance costs due to the repayment by the Company of the outstanding debt in July 2015. As of January 31, 2016, debt on the consolidated balance sheet related to equipment acquired under capital lease was $0.6 million, which was repaid by the Company in April 2016. As of July 31, 2016, the Company did not have any outstanding debt.

Convertible Preferred Stock Warrant Liability	6 Months Ended
Convertible Preferred Stock Warrant Liability	Jul. 31, 2016
Equity [Abstract]
Convertible Preferred Stock Warrant Liability	6. Convertible Preferred Stock Warrant Liability In December 2010 the Company issued a warrant to purchase 70,287 shares of Series Alpha convertible preferred stock. 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. During the three and six months ended July 31, 2015, the Company recorded a remeasurement gain (loss) of $0.1 million and $(0.1) million, respectively, in other income (expense) in the condensed consolidated statement of operations. Upon the completion of the IPO, the fair value of the warrant was determined to be $0.6 million. The warrant was cash settled and the Company paid $0.6 million to the warrant holder from the IPO proceeds. 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. During the three and six months ended July 31, 2015, the Company recorded a remeasurement gain (loss) of $0.1 million and $(0.1) million, respectively, in other income (expense) in the condensed consolidated statement of operations. Upon 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. During the three and six months ended July 31, 2015, the Company recorded a remeasurement loss of $0.1 million and $0.3 million, respectively, in the condensed consolidated statement of operations. 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. The Company did not have any outstanding warrants to purchase convertible preferred stock as of July 31, 2016 and January 31, 2016.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jul. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies The Company leases office space in Palo Alto and Newark, California under operating leases. As of July 31, 2016, the Company had $2.1 million outstanding under operating leases with lease periods expiring through February 2018. 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 repaid the outstanding balance of $0.6 million in April 2016. Rent expense was $0.6 million and $0.4 million for the three months ended July 31, 2016 and 2015, respectively, and $1.1 million and $0.8 million for the six months ended July 31, 2016 and 2015, respectively. As of July 31, 2016, non-cancelable purchase commitments were $2.2 million. Legal Matters—The Company is party to actions and proceedings incident to the Company’s business in the ordinary course of business, including litigation regarding its intellectual property, challenges to the enforceability or validity of its intellectual property, and claims that the Company’s products or services infringe on the intellectual property rights of others. The Company accrues a liability for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. In connection with the Deep Green Wireless Litigation, Securities Litigation, Berks County Litigation and the Alabama Litigation proceedings described in Part II, Item 1 (“Legal 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 condensed 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.

Stockholders' Equity

6 Months Ended

Jul. 31, 2016

Equity [Abstract]

Stockholders' Equity

8. Stockholders’ Equity

Common Stock and Preferred Stock

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

As of July 31, 2016, the Company had 17,399,272 shares of common stock outstanding which included the 5,000,000 shares issued in the IPO. The Company did not have any shares of preferred stock issued and outstanding.

Equity Award Plans

2005 Stock Plan

The Board of Directors adopted, and the stockholders approved, the Company’s 2005 Stock Plan (the “2005 Plan”), in April 2005. The 2005 Plan provides for the grant of incentive stock options to its employees (and employees of its subsidiaries), and for the grant of non-statutory stock options and stock purchase rights to its employees, directors and consultants (and employees and consultants of its subsidiaries). In June 2015, the 2005 Plan was amended and restated in the form of the 2015 Equity Incentive Plan described below. The terms of the 2005 Plan as described in the Prospectus will continue to govern the terms and conditions of the outstanding awards previously granted thereunder.

2015 Equity Incentive Plan

In June 2015, the Company amended and restated its 2005 Plan in the form of 2015 Equity Incentive Plan (the “2015 Plan”) which became effective immediately upon the effectiveness of the Company’s IPO. The 2015 Plan provides for the grant of incentive stock options to its employees and any of its subsidiary corporations’ employees, and for the grant of non-statutory stock options, stock appreciation rights, restricted stock, restricted stock units, performance units and performance shares to its employees, directors and consultants and its subsidiary corporations’ employees and consultants. The Company initially reserved 4,433,102 shares under the 2015 Plan (which is the number of shares previously reserved for issuance under the 2005 Plan) plus 2,205,828 shares which is the number of shares equal to 10% of its outstanding shares of common stock measured at the time of completion of its IPO (as determined on a fully diluted basis, including the shares reserved under its equity plans). In addition, the number of shares available for issuance under the 2015 Plan will be annually increased on the first day of each of its fiscal years beginning with fiscal 2017, by an amount equal to the lessor of (i) 5% of the outstanding shares of its common stock as of the last day of its immediately preceding fiscal year; and (ii) such other amount as the Company’s board of directors may determine. In April 2016, an additional 854,483 shares were authorized for future issuance under the 2015 Plan.

As of July 31, 2016, the Company had 784,076 shares available for future issuance.

Employee Stock Purchase Plan

In conjunction with the completion of its IPO, the Company adopted the 2015 Employee Stock Purchase Plan (“ESPP”). A maximum of 441,165 shares were initially authorized for future issuance. The number of authorized shares under the ESPP is subject to increase on an annual basis. In April 2016, an additional 341,793 shares were authorized for future issuance. 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. During the six months ended July 31, 2016, there was a purchase of 116,629 shares at a purchase price of $5.01 per share in March 2016.

On March 15, 2016 the Company started a new offering period at a new offering price based on the closing price of the Company’s common stock on the same date. The Company concluded that starting a new offering period prior to the completion of the existing offering period resulted in an accounting modification and accordingly, recorded $0.3 million of incremental compensation charge to be recognized over the remaining life of the ESPP offering period. The Company recorded stock-based compensation related to the ESPP of $0.3 million and $18,000, respectively, for the three months ended July 31, 2016 and 2015, and $0.5 million and $18,000, respectively, for the six months ended July 31, 2016 and 2015.

Stock Options

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

Summary of option activity under the Company’s 2005 Plan and 2015 Plan for the six months ended July 31, 2016 is set forth below:

	Options Outstanding
	Number of					Weighted
	Shares			Weighted		Average		Aggregate
	Underlying			Average		Remaining		Intrinsic
	Outstanding			Exercise		Contractual Term		Value
	Options			Price		(Years)		(in thousands)
Balance, January 31, 2016		2,087,584		$	5.59		7.9	$	4,843
Options granted
Options exercised		(167,224	)		1.23
Options canceled		(50,577	)		12.15
Balance, July 31, 2016		1,869,783		$	5.81		7.5	$	6,456
Vested and exercisable, July 31, 2016		865,958		$	4.03		6.4	$	4,368
Vested and expected to vest, July 31, 2016		1,819,919		$	5.75		7.4	$	6,360

The aggregate intrinsic value in the table above represents the difference between the exercise price of the options to purchase common stock and the Company’s closing stock price of $8.50 as of July 31, 2016. The aggregate intrinsic value of options exercised for the three months ended July 31, 2016 and 2015 was $0.6 million and $0.5 million, respectively, and $1.0 million and $0.6 million for the six months ended July 31, 2016 and 2015, respectively.

Restricted Stock Units

Restricted Stock Units (RSUs) were granted to employees, non-employee board members and consultants. These RSUs are subject to a time-based vesting condition, which ranges from one to four years.

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

	Number of Shares			Weighted-Average Grant-Date Fair Value Per Share		Weighted-Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2016		1,056,905		$	9.60		1.43	$	7,176
RSUs granted		1,458,800			7.08
RSUs vested		(79,805	)		12.09
RSUs canceled		(82,050	)		8.10
Balance as of July 31, 2016		2,353,850		$	7.73		1.44	$	20,008

Common Stock Warrants

As of July 31, 2016, the Company had warrants to purchase 97,931 shares of common stock with exercise prices ranging from $4.70 to $6.04 per share. These common 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
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

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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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
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-Paragraph 1
-Subparagraph (SX 210.4-08(e))
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02(31))
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-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
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-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

6 Months Ended

Jul. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

9. Stock-Based Compensation

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2016		2015		2016		2015
Total cost of revenue	$	243	$	65	$	478	$	123
Sales and marketing		355		73		681		129
Research and development		863		239		1,807		456
General and administrative		938		361		1,907		581
Total stock-based compensation expense	$	2,399	$	738	$	4,873	$	1,289

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2016		2015		2016		2015
Stock options	$	630	$	691	$	1,314	$	1,242
Restricted stock units		1,512		29		3,020		29
Employee stock purchase plan		257		18		539		18
Total stock-based compensation expense	$	2,399	$	738	$	4,873	$	1,289

As of July 31, 2016, there was $4.4 million, $13.6 million and $1.3 million of unrecognized share-based compensation expense, net of estimated forfeitures, related to non-vested stock option grants, unvested RSUs and ESPP, respectively, which will be recognized on a straight-line basis over the remaining weighted-average vesting periods of approximately 2.1 years, 2.9 years and 0.9 years, respectively.

Total outstanding non-employee stock options were 50,720 and 87,199 at July 31, 2016 and 2015, respectively. The total outstanding non-employee RSUs were 85,250 at July 31, 2016. There were no outstanding non-employee RSUs at July 31, 2015. The non-employee stock-based compensation expense for the stock options and RSUs was not material for any of the periods presented.

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

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

	Three Months Ended July 31,	Six Months Ended July 31,
	2015	2015
Stock Options:
Expected volatility	54%-59%	54%-62%
Expected term (in years)	5.3-6.1	5.3-6.1
Risk-free interest rate	1.7%-1.9%	1.6%-1.9%
Dividend yield	— %	— %

For the three and six months ended July 31, 2016 and 2015 the fair value of the Company’s employee stock purchase plan was estimated using the Black – Scholes model with the following assumptions:

	Three Months Ended July 31,		Six Months Ended July 31,
	2016	2015	2016	2015
ESPP:
Expected volatility	44%-50%	35%-43%	44%-50%	35%-43%
Expected term (in years)	0.5-2.0	0.7-2.2	0.5-2.0	0.7-2.2
Risk-free interest rate	0.5%-1.0%	0.1%-0.7%	0.5%-1.0%	0.1%-0.7%
Dividend yield	— %	— %	— %	— %

Early Exercise of Common Stock

During the three and six months ended July 31, 2016, the Company issued 29,485 shares and 97,989 shares of common stock following the exercise of common stock options prior to their vesting dates, or early exercises. During the three and six months ended July 31, 2016, 1,771 common stock options were early exercised prior to their vesting. The amounts received from all such early exercises is recorded in accrued expenses and other long-term 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 July 31, 2016 and January 31, 2016, the aggregate proceeds from exercises of common stock options subject to repurchase recorded in accrued expenses and other long-term liabilities totaled $0.1 million and $0.2 million, respectively.

- 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	6 Months Ended
Income Taxes	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Note 10. Income Taxes The Company did not record a provision or benefit for income taxes during the three and six months ended July 31, 2016 and 2015. The Company continues to maintain a full valuation allowance against its net deferred tax assets. As of July 31, 2016, the Company had unrecognized tax benefits of $1.3 million, none of which would currently affect the Company's effective tax rate if recognized due to the Company's net deferred tax assets being fully offset by a valuation allowance. The Company does not anticipate that the amount of unrecognized tax benefits relating to tax positions existing at July 31, 2016 will significantly increase or decrease within the next twelve months. There was no interest expense or penalties related to unrecognized tax benefits recorded through July 31, 2016. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, in light of changing facts and circumstances. Settlement of any particular position could require the use of cash.

Basic and Diluted Net Loss Per Share

6 Months Ended

Jul. 31, 2016

Earnings Per Share [Abstract]

Basic and Diluted Net Loss Per Share

Note 11. Basic and Diluted Net Loss Per Share

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

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

	Three Months Ended July 31,						Six Months Ended July 31,
	2016			2015			2016			2015
Numerator
Net loss	$	(3,340	)	$	(3,403	)	$	(7,296	)	$	(7,338	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		17,280,985			4,233,193			17,180,671			3,422,521
Basic and diluted net loss per share	$	(0.19	)	$	(0.80	)	$	(0.42	)	$	(2.14	)

The following table sets forth the potential shares of common stock that were excluded from diluted weighted-average common shares outstanding:

	Three and Six Months Ended July 31,
	2016		2015
Options to purchase common stock		1,869,783		2,185,018
Employee stock purchase plan		304,400		235,097
Restricted stock units		2,353,850		—
Warrants to purchase common stock		97,931		163,955
Common stock subject to repurchase		79,053		335,114
Potential shares excluded from diluted net loss per share		4,705,017		2,919,184

Defined Contribution Plans	6 Months Ended
Defined Contribution Plans	Jul. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Defined Contribution Plans	12. Defined Contribution Plans The Company’s contributions to the 401(k) defined contribution plan, which are expensed immediately as compensation costs, were $0.1 million and $0.1 million for the three months ended July 31, 2016 and 2015, respectively, and $0.2 million and $0.1 million for the six months ended July 31, 2016 and 2015, respectively.

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

6 Months Ended

Jul. 31, 2016

Accounting Policies [Abstract]

Basis of Presentation

Reverse Stock Split

Initial Public Offering and Conversion of Preferred Stock

Use of Estimates

Concentration of Credit Risk

Concentration of Risk

The concentration of accounts receivable as of July 31, 2016 and January 31, 2016, respectively are as follows:

As of

July 31,

2016

January 31,

2016

Customer A

16%

13%

There were no customers that individually exceeded 10% of revenue during the three and six months ended July 31, 2016 and 2015.

Recent Accounting Pronouncements

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

6 Months Ended

Jul. 31, 2016

Accounting Policies [Abstract]

Concentration of Accounts Receivable

The concentration of accounts receivable as of July 31, 2016 and January 31, 2016, respectively are as follows:

As of

July 31,

2016

January 31,

2016

Customer A

16%

13%

Fair Value Measurement (Tables)

6 Months Ended

Jul. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities at Fair Value

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

	As of July 31, 2016
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	2,970	$	—	$	—	$	2,970
Total cash equivalents	$	2,970	$	—	$	—	$	2,970
Cash								3,742
Total Cash and cash equivalents							$	6,712

Short-term investments:
Corporate debt securities	$	—	$	10,408	$	—	$	10,408
Commercial paper		—		10,122		—		10,122
U.S. agency securities		7,625		—		—		7,625
U.S. government securities		17,170		—		—		17,170
Asset-backed securities		—		1,801		—		1,801
Total short-term investments	$	24,795	$	22,331	$	—	$	47,126

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

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

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

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 July 31, 2016	$	—

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

6 Months Ended

Jul. 31, 2016

Schedule Of Available For Sale Securities [Line Items]

Summary of Short-term Investments

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

	As of July 31, 2016
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	10,408	$	(3	)	$	3	$	10,408
Commercial paper		10,122		—			—		10,122
U.S. agency securities		7,613		—			12		7,625
U.S. government securities		17,140		—			30		17,170
Asset-backed securities		1,801		—			—		1,801
Total short-term investments	$	47,084	$	(3	)	$	45	$	47,126

	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 July 31, 2016				As of January 31, 2016
	Amortized Value		Fair Value		Amortized Value		Fair Value
One year or less	$	39,357	$	39,375	$	19,143	$	19,145
Over one year and less than two years		7,727		7,751		8,831		8,846
Total	$	47,084	$	47,126	$	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 July 31, 2016					As of January 31, 2016
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	10,408	$	(3	)	$	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

Balance Sheet Components (Tables)

6 Months Ended

Jul. 31, 2016

Balance Sheet Components [Abstract]

Components of Inventories

The components of inventories were as follows (in thousands):

	July 31,		January 31,
	2016		2016
Finished goods	$	4,162	$	4,633
Raw material		402		378
Total inventory	$	4,564	$	5,011

Components of Deferred Revenue

The components of deferred revenue were as follows (in thousands):

	July 31,		January 31,
	2016		2016
Deferred revenue:
Subscription and services	$	12,771	$	11,954
Product and other		2,477		3,118
Total deferred revenue		15,248		15,072
Less: current portion of deferred revenue		15,134		15,036
Deferred revenue, noncurrent portion included in other liabilities	$	114	$	36

Components of Accrued Expenses

The components of accrued expenses were as follows (in thousands):

	July 31,		January 31,
	2016		2016
Accrued regulatory fees and taxes	$	4,921	$	5,216
Accrued payroll and related expenses		3,286		3,559
Acquisition-related contingent consideration-current portion		—		288
Other accrued expenses		2,598		3,947
Total accrued expenses	$	10,805	$	13,010

Stockholders' Equity (Tables)

6 Months Ended

Jul. 31, 2016

Equity [Abstract]

Summary of Stock Option Activity Plans

Summary of option activity under the Company’s 2005 Plan and 2015 Plan for the six months ended July 31, 2016 is set forth below:

	Options Outstanding
	Number of					Weighted
	Shares			Weighted		Average		Aggregate
	Underlying			Average		Remaining		Intrinsic
	Outstanding			Exercise		Contractual Term		Value
	Options			Price		(Years)		(in thousands)
Balance, January 31, 2016		2,087,584		$	5.59		7.9	$	4,843
Options granted
Options exercised		(167,224	)		1.23
Options canceled		(50,577	)		12.15
Balance, July 31, 2016		1,869,783		$	5.81		7.5	$	6,456
Vested and exercisable, July 31, 2016		865,958		$	4.03		6.4	$	4,368
Vested and expected to vest, July 31, 2016		1,819,919		$	5.75		7.4	$	6,360

Summary of Restricted Stock Units Activity

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

	Number of Shares			Weighted-Average Grant-Date Fair Value Per Share		Weighted-Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2016		1,056,905		$	9.60		1.43	$	7,176
RSUs granted		1,458,800			7.08
RSUs vested		(79,805	)		12.09
RSUs canceled		(82,050	)		8.10
Balance as of July 31, 2016		2,353,850		$	7.73		1.44	$	20,008

Stock-Based Compensation (Tables)

6 Months Ended

Jul. 31, 2016

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

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2016		2015		2016		2015
Total cost of revenue	$	243	$	65	$	478	$	123
Sales and marketing		355		73		681		129
Research and development		863		239		1,807		456
General and administrative		938		361		1,907		581
Total stock-based compensation expense	$	2,399	$	738	$	4,873	$	1,289

Stock-Based Compensation Expense by Award Type

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2016		2015		2016		2015
Stock options	$	630	$	691	$	1,314	$	1,242
Restricted stock units		1,512		29		3,020		29
Employee stock purchase plan		257		18		539		18
Total stock-based compensation expense	$	2,399	$	738	$	4,873	$	1,289

ESPP

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

	Three Months Ended July 31,		Six Months Ended July 31,
	2016	2015	2016	2015
ESPP:
Expected volatility	44%-50%	35%-43%	44%-50%	35%-43%
Expected term (in years)	0.5-2.0	0.7-2.2	0.5-2.0	0.7-2.2
Risk-free interest rate	0.5%-1.0%	0.1%-0.7%	0.5%-1.0%	0.1%-0.7%
Dividend yield	— %	— %	— %	— %

Employee Stock Option

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

For the three and six months ended July 31, 2015 the fair value of employee stock options grants was estimated using the Black–Scholes model with the following assumptions:

	Three Months Ended July 31,	Six Months Ended July 31,
	2015	2015
Stock Options:
Expected volatility	54%-59%	54%-62%
Expected term (in years)	5.3-6.1	5.3-6.1
Risk-free interest rate	1.7%-1.9%	1.6%-1.9%
Dividend yield	— %	— %

Basic and Diluted Net Loss Per Share (Tables)

6 Months Ended

Jul. 31, 2016

Earnings Per Share [Abstract]

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

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

	Three Months Ended July 31,						Six Months Ended July 31,
	2016			2015			2016			2015
Numerator
Net loss	$	(3,340	)	$	(3,403	)	$	(7,296	)	$	(7,338	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		17,280,985			4,233,193			17,180,671			3,422,521
Basic and diluted net loss per share	$	(0.19	)	$	(0.80	)	$	(0.42	)	$	(2.14	)

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

The following table sets forth the potential shares of common stock that were excluded from diluted weighted-average common shares outstanding:

	Three and Six Months Ended July 31,
	2016		2015
Options to purchase common stock		1,869,783		2,185,018
Employee stock purchase plan		304,400		235,097
Restricted stock units		2,353,850		—
Warrants to purchase common stock		97,931		163,955
Common stock subject to repurchase		79,053		335,114
Potential shares excluded from diluted net loss per share		4,705,017		2,919,184

Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 06, 2015	Jul. 31, 2015 USD ($) $ / shares shares	Jul. 31, 2016 Customer shares	Jul. 31, 2015 Customer $ / shares shares	Jul. 31, 2016 Customer shares	Jul. 31, 2015 Customer $ / shares shares	Jan. 31, 2016 shares
Summary Of Significant Accounting Policies [Line Items]
Date of Incorporation of Company					Nov. 19, 2003
Reverse stock split ratio	0.5
Common stock, shares issued \| shares			17,399,272		17,399,272		16,916,250
Number of customers that individually exceeded 10% of revenue \| Customer			0	0	0	0
Initial Public Offering
Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued \| shares		5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
Public offering price \| $ / shares		$ 13.00		$ 13.00		$ 13.00
Net proceeds from issuance of common stock		$ 56.9
Underwriters discounts and commissions related to stock issuance		4.5
Offering cost related to stock issuance		$ 3.6

Description of Business and Summary of Significant Accounting Policies - Concentration of Accounts Receivable (Details)	6 Months Ended	12 Months Ended
	Jul. 31, 2016	Jan. 31, 2016
Accounts Receivable \| Customer Concentration Risk \| Customer A
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	13.00%

Fair Value Measurement - Additional Information (Details)	6 Months Ended
	Jul. 31, 2016 USD ($)
Fair Value Disclosures [Abstract]
Transfers into or out of the Level 3 category	$ 0

Fair Value Measurement - Schedule of Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Assets:
Total Cash and cash equivalents	$ 6,712	$ 27,413
Total short-term investments	47,126	27,991
Liabilities:
Total liabilities		288
Corporate Debt Securities
Assets:
Total short-term investments	10,408	7,845
Commercial Paper
Assets:
Total short-term investments	10,122	4,986
U.S. Agency Securities
Assets:
Total short-term investments	7,625	7,666
U.S. Government Securities
Assets:
Total short-term investments	17,170	7,494
Asset-backed Securities
Assets:
Total short-term investments	1,801
Cash Equivalents
Assets:
Total Cash and cash equivalents	2,970	6,961
Cash Equivalents \| Money Market Funds
Assets:
Total Cash and cash equivalents	2,970	3,462
Cash Equivalents \| Commercial Paper
Assets:
Total Cash and cash equivalents		3,499
Cash
Assets:
Total Cash and cash equivalents	3,742	20,452
Acquisition-Related Contingent Consideration
Liabilities:
Total liabilities		288
Level 1
Assets:
Total short-term investments	24,795	7,494
Level 1 \| U.S. Agency Securities
Assets:
Total short-term investments	7,625
Level 1 \| U.S. Government Securities
Assets:
Total short-term investments	17,170	7,494
Level 1 \| Cash Equivalents
Assets:
Total Cash and cash equivalents	2,970	3,462
Level 1 \| Cash Equivalents \| Money Market Funds
Assets:
Total Cash and cash equivalents	2,970	3,462
Level 2
Assets:
Total short-term investments	22,331	20,497
Level 2 \| Corporate Debt Securities
Assets:
Total short-term investments	10,408	7,845
Level 2 \| Commercial Paper
Assets:
Total short-term investments	10,122	4,986
Level 2 \| U.S. Agency Securities
Assets:
Total short-term investments		7,666
Level 2 \| Asset-backed Securities
Assets:
Total short-term investments	$ 1,801
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 - Schedule of Changes in Level 3 Fair Value Category (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	$ 288
Payout of consideration		$ 124
Acquisition-Related Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	288
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning 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)

Short-term Investments - Summary of Short-term Investment (Details) - Short-term Investments [Member] - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	$ 47,084	$ 27,974
Short-term Investments, Unrealized Losses	(3)	(6)
Short-term Investments, Unrealized Gains	45	23
Short-term Investments, Fair Value	47,126	27,991
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	10,408	7,851
Short-term Investments, Unrealized Losses	(3)	(6)
Short-term Investments, Unrealized Gains	3
Short-term Investments, Fair Value	10,408	7,845
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	10,122	4,985
Short-term Investments, Unrealized Gains		1
Short-term Investments, Fair Value	10,122	4,986
U.S. Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	7,613	7,661
Short-term Investments, Unrealized Gains	12	5
Short-term Investments, Fair Value	7,625	7,666
US Government Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	17,140	7,477
Short-term Investments, Unrealized Gains	30	17
Short-term Investments, Fair Value	17,170	$ 7,494
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	1,801
Short-term Investments, Fair Value	$ 1,801

Short-term Investments - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2015
Short-term Investments [Member]
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 [Member] - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
One year or less, amortized cost	$ 39,357	$ 19,143
Over one year and less than two years, amortized cost	7,727	8,831
Short-term Investments, Amortized Cost	47,084	27,974
One year or less, fair value	39,375	19,145
Over one year and less than two years, fair value	7,751	8,846
Short-term Investments, Fair Value	$ 47,126	$ 27,991

Short-term Investments - Schedule of Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2016	Jan. 31, 2016
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Total short-term investments	$ 47,126	$ 27,991
Corporate Debt Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Total short-term investments	10,408	7,845
Investments, Unrealized Losses	$ (3)	$ (6)

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

+ Details

Balance Sheet Components - Components of Inventories (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 4,162	$ 4,633
Raw material	402	378
Total inventory	$ 4,564	$ 5,011

Balance Sheet Components - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 15,248	$ 15,072
Less: current portion of deferred revenue	15,134	15,036
Deferred revenue, noncurrent portion included in other liabilities	114	36
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	12,771	11,954
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 2,477	$ 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 Accrued Expenses (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Payables And Accruals [Abstract]
Accrued regulatory fees and taxes	$ 4,921	$ 5,216
Accrued payroll and related expenses	3,286	3,559
Acquisition-related contingent consideration-current portion		288
Other accrued expenses	2,598	3,947
Total accrued expenses	$ 10,805	$ 13,010

Debt - Additional Information (Details) - USD ($)		1 Months Ended					3 Months Ended		6 Months Ended
Debt - Additional Information (Details) - USD ($)	Jul. 21, 2016	Jul. 31, 2015	Jan. 31, 2015	Jul. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2016	Jun. 30, 2009	May 31, 2009
Debt Instrument [Line Items]
Warrant to purchase convertible preferred stock												55,696	55,696
Exercise price per share of warrants											$ 4.70
Interest expense							$ 0	$ 600,000	$ 18,000	$ 900,000
Amortization of debt issuance costs							0	20,000	0	64,000
Write-off of non-cash deferred debt issuance costs								$ 332,000		332,000
Outstanding debt on equipment acquired under capital lease							0		$ 0		$ 600,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity period					2014-12				2016-07
Debt instrument, extended maturity period	2016-08			2016-07
Debt instrument, effective date									Jul. 21, 2016
Revolving credit line			$ 12,000,000
Credit facility, maturity date									Aug. 31, 2016
Revolving credit line							$ 12,000,000		$ 12,000,000
Interest rate									2.75%
Interest rate							3.50%		3.50%
Term Debt \| Secured Debt Agreement
Debt Instrument [Line Items]
Debt instrument, maturity period						2015-09
Repayment of outstanding balance										$ 5,300,000
New Term Loan
Debt Instrument [Line Items]
Repayment of outstanding balance		$ 5,000,000
Revolving credit line			$ 10,000,000
Credit facility, maturity date			Jan. 05, 2018
Warrant to purchase convertible preferred stock			76,630
Exercise price per share of warrants			$ 6.04
Warrants, exercisable date			2025-01

Convertible Preferred Stock Warrant Liability - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended		6 Months Ended
	Jul. 31, 2015	Oct. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	Jan. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Dec. 31, 2010	Jun. 30, 2009	May 31, 2009
Class Of Stock [Line Items]
Warrants to purchase convertible preferred stock outstanding					0		0
Payment for warrant holders							$ 0.6
Warrant to purchase convertible preferred stock										55,696	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
Exercise price per share of warrants					$ 4.70
Warrants exercised, net					21,421
Series Alpha Convertible Preferred Stock
Class Of Stock [Line Items]
Warrants to purchase convertible preferred stock outstanding									70,287
December 2010 warrant
Class Of Stock [Line Items]
Remeasurement gain (loss) from change in fair value of warrants						$ 0.1		$ (0.1)
May and June 2009 warrants
Class Of Stock [Line Items]
Remeasurement gain (loss) from change in fair value of warrants						0.1		(0.1)
Aggregate liability	$ 0.4
April 2012, December 2012 and October 2014 warrants
Class Of Stock [Line Items]
Remeasurement gain (loss) from change in fair value of warrants						$ (0.1)		$ (0.3)
Aggregate liability	$ 0.7

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Operating Leased Assets [Line Items]
Operating lease expiration date				2018-02
Operating leases outstanding		$ 2,100,000		$ 2,100,000
Rent expense		600,000	$ 400,000	1,100,000	$ 800,000
Non-cancelable purchase commitments		$ 2,200,000		2,200,000
Lease Agreement One
Operating Leased Assets [Line Items]
Capital lease of computer equipment maturity date	2016-12
Right to purchase the equipment, amount	$ 1
Repayments of capital lease obligations				$ 600,000

Stockholders' Equity - Additional Information (Details)	1 Months Ended	3 Months Ended			6 Months Ended
Stockholders' Equity - Additional Information (Details)	Apr. 30, 2016 shares	Jul. 31, 2016 USD ($) $ / shares shares	Apr. 30, 2016	Jul. 31, 2015 USD ($) $ / shares shares	Jul. 31, 2016 USD ($) Peroid $ / shares shares	Jul. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2016 $ / shares shares	Jul. 06, 2015 $ / shares shares
Stockholders Equity Note Disclosure [Line Items]
Common stock, shares authorized		100,000,000			100,000,000		100,000,000	100,000,000
Common stock, par value \| $ / shares		$ 0.0001			$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares authorized		100,000,000			100,000,000		100,000,000	10,000,000
Preferred stock, par value \| $ / shares		$ 0.0001			$ 0.0001		$ 0.0001	$ 0.0001
Common stock, shares outstanding		17,399,272			17,399,272		16,916,250
Common stock, shares issued		17,399,272			17,399,272		16,916,250
Preferred stock, shares issued		0			0		0
Preferred stock, shares outstanding		0			0		0
Stock-based compensation \| $		$ 2,399,000		$ 738,000	$ 4,873,000	$ 1,289,000
Exercise price per share of warrants \| $ / shares							$ 4.70
Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Warrants expiration period			2025-01
Shares of common stock		97,931			97,931
Maximum \| Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Exercise price per share of warrants \| $ / shares		$ 6.04			$ 6.04
Minimum \| Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Exercise price per share of warrants \| $ / shares		$ 4.70			$ 4.70
Employee Stock Option
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $		$ 630,000		691,000	$ 1,314,000	1,242,000
Employee stock option expiration period					10 years
Closing price of common stock \| $ / shares		$ 8.50			$ 8.50
Aggregate intrinsic value of options exercised \| $		$ 600,000		500,000	$ 1,000,000	600,000
Employee Stock Option \| Maximum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period					5 years
Restricted Stock Units (RSUs)
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $		$ 1,512,000		$ 29,000	$ 3,020,000	$ 29,000
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
2015 Equity Incentive Plan
Stockholders Equity Note Disclosure [Line Items]
Number of shares initially reserved under the plan		4,433,102			4,433,102
Additional aggregate number of shares issued under the plan	854,483				2,205,828
Percentage of common stock outstanding					5.00%
Common stock available for future issuance		784,076			784,076
Initial Public Offering
Stockholders Equity Note Disclosure [Line Items]
Common stock, shares issued		5,000,000		5,000,000	5,000,000	5,000,000
Purchase price of shares under ESPP \| $ / shares				$ 13.00		$ 13.00
Initial Public Offering \| 2015 Equity Incentive Plan
Stockholders Equity Note Disclosure [Line Items]
Percentage of common stock outstanding					10.00%
ESPP
Stockholders Equity Note Disclosure [Line Items]
Additional aggregate number of shares issued under the plan	341,793
Maximum of shares initially authorized for future issuance		441,165			441,165
Percentage of eligible compensation subject to plan limitation		15.00%			15.00%
Employee stock purchase plan offering period					24 months
Number of purchase periods \| Peroid					4
Purchase periods					6 months
Purchase price of common stock as percentage of fair market value					85.00%
Number of shares issued under ESPP					116,629
Purchase price of shares under ESPP \| $ / shares		$ 5.01			$ 5.01
Incremental compensation charge to be recognized over the remaining life \| $		$ 300,000
Stock-based compensation \| $		$ 257,000		$ 18,000	$ 539,000	$ 18,000

Stockholders' Equity - Summary of Stock Option Activity Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2016	Jan. 31, 2016
Number of Shares Underlying Outstanding Options
Number of Shares Underlying Outstanding Options, Beginning balance	2,087,584
Number of Shares Underlying Outstanding Options, Options exercised	(167,224)
Number of Shares Underlying Outstanding Options, Options canceled	(50,577)
Number of Shares Underlying Outstanding Options, Ending balance	1,869,783	2,087,584
Number of Shares Underlying Outstanding Options, Vested and exercisable	865,958
Number of Shares Underlying Outstanding Options, Vested and expected to vest	1,819,919
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance	$ 5.59
Weighted Average Exercise Price, Options exercised	1.23
Weighted Average Exercise Price, Options canceled	12.15
Weighted Average Exercise Price, Ending balance	5.81	$ 5.59
Weighted Average Exercise Price, Vested and exercisable	4.03
Weighted Average Exercise Price, Vested and expected to vest	$ 5.75
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term	7 years 6 months	7 years 10 months 24 days
Weighted Average Remaining Contractual Term, Vested and exercisable	6 years 4 months 24 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	7 years 4 months 24 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Options Outstanding	$ 6,456	$ 4,843
Aggregate Intrinsic Value, Vested and exercisable	4,368
Aggregate Intrinsic Value, Vested and expected to vest	$ 6,360

Stockholders' Equity - Summary of RSU activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2016	Jan. 31, 2016
Number of Shares
Number of Shares, RSUs Beginning Balance	1,056,905
Number of Shares, RSUs granted	1,458,800
Number of Shares, RSUs vested	(79,805)
Number of Shares, RSUs canceled	(82,050)
Number of Shares, RSUs Ending Balance	2,353,850	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	7.08
Weighted-Average Grant-Date Fair Value Per Share, RSUs vested	12.09
Weighted-Average Grant-Date Fair Value Per Share, RSUs canceled	8.10
Weighted-Average Grant-Date Fair Value Per Share, Ending Balance	$ 7.73	$ 9.60
Weighted-Average Remaining Contractual Life
Weighted-Average Remaining Contractual Life	1 year 5 months 9 days	1 year 5 months 5 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 20,008	$ 7,176

Stock-Based Compensation - Total Stock-Based Compensation Recognized for Stock-Based Awards in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,399	$ 738	$ 4,873	$ 1,289
Total cost of revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	243	65	478	123
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	355	73	681	129
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	863	239	1,807	456
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 938	$ 361	$ 1,907	$ 581

Stock-Based Compensation - Stock-Based Compensation Expense by Award Type (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 2,399,000	$ 738,000	$ 4,873,000	$ 1,289,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	630,000	691,000	1,314,000	1,242,000
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	1,512,000	29,000	3,020,000	29,000
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 257,000	$ 18,000	$ 539,000	$ 18,000

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2016	Jan. 31, 2016	Jul. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	50,720	50,720		87,199
Common stock, shares, Issued	29,485	97,989
Common stock options early exercised prior to vesting	1,771	1,771
Accrued expenses and other long-term liabilities	$ 0.1	$ 0.1	$ 0.2
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	4.4	$ 4.4
Stock-based compensation expenses recognized on straight line basis offering period		2 years 1 month 6 days
Number of Shares Underlying Outstanding Options, Options granted		0
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	$ 13.6	$ 13.6
Stock-based compensation expenses recognized on straight line basis offering period		2 years 10 months 24 days
Non employee stock options outstanding	2,353,850	2,353,850	1,056,905
Restricted Stock Units (RSUs) \| Non Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	85,250	85,250		0
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 1.3	$ 1.3
Stock-based compensation expenses recognized on straight line basis offering period		10 months 24 days

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Options Grants Using Black-Scholes Option Pricing Model (Details) - Employee Stock Option	3 Months Ended	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	54.00%	54.00%
Risk-free interest rate, minimum	1.70%	1.60%
Expected volatility, maximum	59.00%	62.00%
Risk-free interest rate, maximum	1.90%	1.90%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	5 years 3 months 18 days	5 years 3 months 18 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 1 month 6 days

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Purchase Plan Using Black-Scholes Option Pricing Model (Details) - ESPP	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	44.00%	35.00%	44.00%	35.00%
Risk-free interest rate, minimum	0.50%	0.10%	0.50%	0.10%
Expected volatility, maximum	50.00%	43.00%	50.00%	43.00%
Risk-free interest rate, maximum	1.00%	0.70%	1.00%	0.70%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	8 months 12 days	6 months	8 months 12 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years	2 years 2 months 12 days	2 years	2 years 2 months 12 days

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Income Tax Disclosure [Abstract]
Provision or benefit for income taxes	$ 0	$ 0	$ 0	$ 0
Unrecognized tax benefits	$ 1,300,000		1,300,000
Interest expense or penalties related to unrecognized tax benefits			$ 0

Basic and Diluted Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Numerator
Net loss	$ (3,340)	$ (3,403)	$ (7,296)	$ (7,338)
Denominator
Weighted-average common shares for basic and diluted net loss per share	17,280,985	4,233,193	17,180,671	3,422,521
Basic and diluted net loss per share	$ (0.19)	$ (0.80)	$ (0.42)	$ (2.14)

Basic and Diluted Net Loss Per Share - Potential Shares of Common Stock Excluded from Diluted Weighted-Average Common Shares Outstanding (Details) - shares	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	4,705,017	2,919,184
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	304,400	235,097
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	1,869,783	2,185,018
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	2,353,850
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	79,053	335,114
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	163,955

Defined Contribution Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Compensation costs	$ 0.1	$ 0.1	$ 0.2	$ 0.1