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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jul. 31, 2015	Sep. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2015
Document Fiscal Year Focus	2016
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		16,732,591

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 59,173	$ 9,133
Accounts receivable, net	4,923	4,394
Inventories	7,221	8,081
Deferred inventory costs	1,690	2,248
Prepaid expenses and other current assets	1,122	945
Total current assets	74,129	24,801
Property and equipment, net	3,159	2,893
Intangible assets, net	1,081	1,278
Goodwill	1,117	1,117
Other assets	695	1,188
Total assets	80,181	31,277
Current liabilities:
Accounts payable	7,320	3,967
Accrued expenses	11,493	10,313
Short-term debt	668	1,562
Convertible preferred stock warrant liability		474
Deferred revenue	13,976	14,348
Total current liabilities	33,457	30,664
Long-term debt	292	10,398
Convertible preferred stock warrant liability - noncurrent		743
Other long-term liabilities	252	980
Total liabilities	34,001	42,785
Commitments and contingencies (Note 7)
Stockholders’ equity (deficit):
Preferred stock
Common stock	2
Additional paid-in capital	104,272	5,611
Accumulated deficit	(58,094)	(50,756)
Total stockholders’ equity (deficit)	46,180	(45,145)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 80,181	31,277
Convertible Preferred Stock
Stockholders’ equity (deficit):
Preferred stock		$ 33,637

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares	Jul. 31, 2015	Jan. 31, 2015
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	13,000,000
Common stock, shares issued	16,684,686	2,515,065
Common stock, shares outstanding	16,684,686	2,515,065
Convertible Preferred Stock
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	0	8,708,333
Preferred stock, shares issued	0	8,353,748
Preferred stock, shares outstanding	0	8,353,748

CONDENSED CONSOLIDATED STATEMENTS OF OPERATION (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Revenue:
Subscription and services	$ 17,449,000	$ 12,702,000	$ 33,025,000	$ 23,588,000
Product and other	3,687,000	3,999,000	7,963,000	9,412,000
Total revenue	21,136,000	16,701,000	40,988,000	33,000,000
Cost of revenue:
Subscription and services	6,310,000	4,405,000	11,934,000	8,222,000
Product and other	3,583,000	3,770,000	7,790,000	8,545,000
Total cost of revenue	9,893,000	8,175,000	19,724,000	16,767,000
Gross profit	11,243,000	8,526,000	21,264,000	16,233,000
Operating expenses:
Sales and marketing	6,813,000	5,830,000	12,708,000	9,560,000
Research and development	4,284,000	2,930,000	8,381,000	5,231,000
General and administrative	3,206,000	1,288,000	6,167,000	2,218,000
Total operating expenses	14,303,000	10,048,000	27,256,000	17,009,000
Loss from operations	(3,060,000)	(1,522,000)	(5,992,000)	(776,000)
Other (expense) income :
Interest expense, net	(607,000)	(51,000)	(892,000)	(104,000)
Change in fair value of warrants	274,000	(31,000)	(442,000)	(215,000)
Other (expense) income, net	(10,000)	1,000	(12,000)	(9,000)
Loss before income taxes	(3,403,000)	(1,603,000)	(7,338,000)	(1,104,000)
Income tax benefit	0	502,000	0	502,000
Net loss	$ (3,403,000)	$ (1,101,000)	$ (7,338,000)	$ (602,000)
Net loss per share of common stock:
Basic and diluted	$ (0.80)	$ (0.48)	$ (2.14)	$ (0.26)
Weighted-average number of shares used in per share amounts:
Basic and diluted	4,233,193	2,273,007	3,422,521	2,347,728

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Cash flows from operating activities:
Net loss	$ (7,338)	$ (602)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,289	95
Depreciation and amortization	670	412
Amortization of intangible assets	197	96
Deferred income taxes		(502)
Non-cash interest expense	64	28
Write-off of non-cash deferred debt issuance costs	332
Change in fair value of acquisition related contingent consideration	124	93
Change in fair value of warrant liability	442	215
Changes in operating assets and liabilities:
Accounts receivable, net	(529)	(2,217)
Inventories	860	(2,734)
Deferred inventory costs	558	(683)
Prepaid expenses and other assets	(178)	371
Accounts payable and accrued expenses	3,293	2,568
Other long term liabilities	(62)	47
Deferred revenue	(372)	2,724
Net cash used in operating activities	(650)	(89)
Cash flows from investing activities:
Purchases of property and equipment	(866)	(462)
Business acquisition, net of cash assumed		(672)
Net cash used in investing activities	(866)	(1,134)
Cash flows from financing activities:
Proceeds from initial public offering, net	58,848
Repayment of debt	(11,294)	(733)
Payment of acquisition related earn-out	(475)
Proceeds from exercise of preferred and common stock warrants	61	139
Payment of preferred warrant liability	(584)
Net cash provided by (used in) financing activities	51,556	(594)
Net increase (decrease) in cash and cash equivalents	50,040	(1,817)
Cash and cash equivalents at beginning of period	9,133	6,364
Cash and cash equivalents at end of period	59,173	4,547
Supplemental disclosure of cash flow information:
Income taxes paid	2	1
Interest paid	439	109
Non-cash investing and financing activities:
Conversion of preferred stock to common stock	38,629
Unpaid offering costs	1,644
De-recognition of warrant liability to additional paid-in capital	1,075
Shares issued as consideration in business acquisition and related earnout	451	338
Unpaid portion of property and equipment purchases	69	$ 277
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, 2015
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 our solutions. The Company was incorporated in Delaware on November 19, 2003.

Significant Accounting Policies

6 Months Ended

Jul. 31, 2015

Accounting Policies [Abstract]

Significant Accounting Policies

2. Summary of Significant Accounting Policies

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 prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended, on July 17, 2015 (the “Prospectus”). There have been no changes to our significant accounting policies described in the prospectus that have had a material impact on our condensed consolidated financial statements and related notes.

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, 2016. The condensed consolidated balance sheet as of January 31, 2015 included herein was derived from the audited financial statements as of that date.

The condensed consolidated financial statements include our accounts and the accounts of our wholly-owned subsidiaries. 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

On July 22, 2015, the Company completed its initial public offering (the “IPO”). As a result, the following transactions were recorded in the Company’s consolidated financial statements as of July 31, 2015:

The Company issued 5,000,000 shares of its common stock at the initial public offering price of $13.00 per share. The net proceeds from the sale of the shares was $57.1 million after deducting the underwriters’ discounts and commissions of $4.5 million and $3.4 million of offering expenses.

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

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

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

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

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

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 income and expenses during the reporting period. 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.

Comprehensive Loss

The Company does not have any components of comprehensive income (loss), as such the net loss for all periods reported equals comprehensive loss.

Concentration of Risk— The concentration of accounts receivable, net of allowance of returns of $0 and $0.1 million as of July 31, 2015 and January 31, 2015, respectively are as follows:

	As of
	July 31, 2015			January 31, 2015
Customer A		16	%		11	%
Customer B		14	%	*
Customer C	*				23	%
Customer D	*				10	%

* represents less than 10% during the period

There were no customers that individually exceeded 10% of our revenue during the three and six months ended July 31, 2015 and 2014.

Recent Accounting Pronouncements

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

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 the Company’s consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11 (ASC 330), Simplifying the Measurement of Inventory related to measure 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 the Company’s consolidated financial statements.

Fair Value Measurement

6 Months Ended

Jul. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurement

3. 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 assets and Level 3 liabilities. Money market funds have been classified as Level 1 because these securities are valued based upon quoted prices in active markets. The money market funds are classified as cash equivalents.

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

There were no transfers into or out of the Level 3 category during the six months ended July 31, 2015 and during the year ended January 31, 2015.

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

	Balance as of July 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Cash	$	156	$	—	$	—	$	156
Money market fund		59,017		—		—		59,017
Total Cash and Cash Equivalents	$	59,173	$	—	$	—	$	59,173

Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	798	$	798
Convertible preferred stock warrant liability		—		—		—		—
Total liabilities	$	—	$	—	$	798	$	798

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

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

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

	Convertible Preferred Stock Warrant Liability			Acquisition-Related Contingent Consideration
Balance at January 31, 2015	$	1,217		$	1,695
Payout of consideration		—			(570	)
Issuance of shares		—			(451	)
Changes in fair value		442			124
Payment of preferred warrant liability upon IPO		(584	)		—
De-recognition of preferred warrant liability to additional paid-in capital		(1,075	)		—
Balance at July 31, 2015	$	—		$	798

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

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

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

- Definition

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

+ References + Details

Balance Sheet Components

6 Months Ended

Jul. 31, 2015

Balance Sheet Components [Abstract]

Balance Sheet Components

4. Balance Sheet Components

Inventories

The following table shows the components of inventories (in thousands):

	July 31,		January 31,
	2015		2015
Finished goods	$	5,972	$	5,719
Raw material		1,249		2,362
Total inventory	$	7,221	$	8,081

Deferred Revenue

The following table shows the components of deferred revenue (in thousands):

	July 31,		January 31,
	2015		2015
Deferred revenue:
Subscription and services	$	11,128	$	9,863
Product and other		2,884		4,523
Total deferred revenue		14,012		14,386
Less: current portion of deferred revenue		13,976		14,348
Deferred revenue, noncurrent portion included in other long-term liabilities	$	36	$	38

Accrued Expenses

The following table shows the components of accrued expenses (in thousands):

	July 31,		January 31,
	2015		2015
Accrued regulatory fees and taxes	$	4,946	$	4,762
Accrued payroll and related expenses		2,410		2,022
Acquisition-related contingent consideration-current portion		797		1,027
Other accrued expenses		3,340		2,502
Total accrued expenses	$	11,493	$	10,313

Debt	6 Months Ended
Debt	Jul. 31, 2015
Debt Disclosure [Abstract]
Debt	5. Debt In April 2012, (amended in October 2012), the Company entered into a secured debt agreement (“Term Debt”) in the amount of $4.0 million. The debt had a maturity date in September 2015 and a fixed interest rate of 5.75%. The Company made monthly interest-only payments through September 2012, and monthly payments of principal and interest thereafter. In July 2015, the Company paid off the remaining balance of $0.3 million using a portion of the IPO proceeds. In December 2012, the Company entered into an amended secured debt agreement, adding a revolving line of credit in the amount of $6.0 million (“the Revolver”). The interest rate on the Revolver is 2.75% above the prime rate (6.0% at January 31, 2015). The Revolver includes a financial covenant that the Company is required to have a certain number of subscribers each quarter. The Revolver was originally due to mature in December 2014. In July 2014, the Company entered into an amended agreement to extend the maturity date until July 2016. In October 2014, the Company borrowed $5.0 million under the Revolver. The outstanding debt of $5.0 million was repaid in July 2015 using a portion of the IPO proceeds. In January 2015, the Company entered into an amended line of credit under a loan and security agreement with its current lender which increased the amount available under the Revolver to $12.0 million and added a new line of credit of up to $10.0 million. The Company’s credit agreements with its lender contain customary negative covenants that limit the ability to, among other things, incur additional indebtedness, grant liens, make investments, repurchase stock, pay dividends, transfer assets and merge or consolidate. In January 2015, the Company drew down $5.0 million of this new line of credit. The interest rate on advances under the line of credit is 11%, and interest is payable monthly. The original maturity date of the line of credit was January 2018. The Company repaid this outstanding debt of $5.0 million in July 2015 using a portion of the IPO proceeds. In connection with the agreement, the Company issued warrants to purchase 76,630 shares of the Company’s common stock with an exercise price of $6.04 per share that are exercisable until January 2025. These warrants remained outstanding as of July 31, 2015. The Company has certain non-financial covenants in connection with the borrowings. As of January 31, 2015 and July 31, 2015, the Company was in compliance with all the covenants under the Revolver agreement. As of July 31, 2015, the amount available under the Revolver agreement was $12.0 million. Total interest expense recognized was $0.6 million and $0.1 million for the three months ended July 31, 2015 and 2014, respectively, and $0.9 million and $0.1 million for the six months ended July 31, 2015 and 2014, respectively. Total amortization of debt issuance costs recognized was $20,000 and $13,000 for the three months ended July 31, 2015 and 2014, respectively and $64,000 and $28,000 for the six months ended July 31, 2015 and 2014, 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 all of the outstanding debt in July 2015. As of July 31, 2015, the debt on the consolidated balance sheet related to equipment acquired under capital lease.

Convertible Preferred Stock Warrant Liability

6 Months Ended

Jul. 31, 2015

Equity [Abstract]

Convertible Preferred Stock Warrant Liability

6. Convertible Preferred Stock Warrant Liability

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

			Fair value				Fair value				Fair value
	Warrants		of Warrants		Warrants		of Warrants		Warrants		of Warrants
	outstanding		Liabilities as of		outstanding		Liabilities as of		outstanding		Liabilities as of
	as of		January 31, 2015		as of		April 30, 2015		as of		July 31, 2015
	January 31, 2015		(in thousands)		April 30, 2015		(in thousands)		July 31,2015		(in thousands)
December 2010 warrant		70,287	$	474		70,287	$	726		—	$	—
April 2012, December 2012 and October 2014 warrants		66,026		374		66,026		611		—		—
May and June 2009 warrants		55,696		369		55,696		596		—		—
Total		192,009	$	1,217		192,009	$	1,933		—	$	—

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

The warrant was initially measured at its fair value and recorded as a derivative liability. On each reporting date the change in fair value of the warrant was determined based on Monte-Carlo valuation model or IPO pricing on payout. The Company recorded a remeasurement gain (loss) of $0.1 million and $(17,000) during the three months ended July 31, 2015 and 2014, respectively; and $(0.1) million and $(0.1) million during the six months ended July 31, 2015 and July 31, 2014, respectively.

In April 2012, December 2012 and October 2014, the Company issued warrants to purchase an aggregate of 66,026 shares of Series Alpha convertible preferred stock with an exercise price of $4.70 per share in connection with a debt agreement with a lender. The warrants had expiration dates ranging from April 2022 to December 2022. The Company recorded the warrants as derivative liability. The warrants were initially measured at fair value and remeasured at every reporting period date using Monte-Carlo valuation. The Company recorded a remeasurement gain (loss) of $(0.1) million and $(9,000) for the three months ended July 31, 2015 and 2014 respectively, and $(0.3) million and $(0.1) million for the six months ended July 31, 2015 and 2014, respectively. Upon completion of the IPO on July 22, 2015, the total aggregate liability of $0.7 million related to these warrants was derecognized and reclassified to additional paid in capital which then automatically converted into warrants to purchase shares of common stock on a 1:1 basis.

In June 2009, the Company issued warrants to purchase 34,397 shares of Series Alpha convertible preferred stock and in May 2009, the Company issued warrants to purchase 21,299 shares of convertible preferred stock. The Company recorded the warrants to purchase shares of convertible preferred stock as derivative liabilities. These warrants were initially measured at fair value and remeasured at every reporting period date using a Black Scholes valuation model and the change in the fair value was recorded in other (expense) income in the condensed consolidated statement of operations. The Company recorded a remeasurement gain (loss) of $0.1 million and $(5,000) for the three months ended July 31, 2015 and 2014, respectively, and $(0.1) million and $(48,000) for the six months ended July 31, 2015 and 2014, respectively.

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

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2015		2014		2015	2014
Assumptions:
Expected volatility		66%		70%	66%-70%		70%
Expected term (in years)	0-1.0		1.8-1.9		0-1.1	1.8-2.1
Risk-free interest rate	0%-0.3%			0.5%	0%-0.3%		0.5%
Dividend yield	— %		— %		— %	— %

Commitments and Contingencies

6 Months Ended

Jul. 31, 2015

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 that are scheduled to expire through February 2018.

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

Minimum rental commitments under all non-cancelable leases with an initial term in excess of one year as of July 31, 2015, were as follows (in thousands):

	Capital			Operating
Year Ending July 31,	Leases			Leases
2016 (remaining six months)	$	357		$	775
2017		653			1,589
2018		—			1,202
2019		—			27
Total	$	1,010		$	3,593
Less: Amount representing interest		(50	)
Present value of lease payments		960
Less: Current portion		(668	)
Capital lease—net of current portion	$	292

Rent expense was $0.3 million and $0.2 million for the three months ended July 31, 2015 and 2014, respectively, and $0.6 million and $0.4 for the six months ended July 31, 2015 and 2014, respectively.

As of July 31, 2015, non-cancelable purchase commitments were $1.9 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 management’s opinion, there are no contingent liabilities requiring accrual or disclosure as of July 31, 2015.

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, 2015

Equity [Abstract]

Stockholders' Equity

8. Stockholders’ Equity

Reverse Stock Split

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

Convertible Preferred Stock

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

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, 2015 the Company had 16,684,686 shares of common stock outstanding which includes the 5,000,000 shares issued in the IPO. The Company did not have any shares of preferred stock issued and outstanding.

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 maximum aggregate number of shares that may be issued under the 2015 Plan is 4,433,102 shares (which is the number of shares previously reserved for issuance under the 2005 Plan) plus 2,205,828 shares which is the number of shares equal to 10% of its outstanding shares of common stock measured at the time of completion of its IPO (as determined on a fully diluted basis, including the shares reserved under its equity plans). In addition, the number of shares available for issuance under the 2015 Plan will be annually increased on the first day of each of its fiscal years beginning with fiscal 2017, by an amount equal to the lessor of (i) 5% of the outstanding shares of its common stock as of the last day of its immediately preceding fiscal year; and (ii) such other amount as the Company’s board of directors may determine.

As of July 31, 2015, the Company had 2,181,156 shares available for future issuance.

Employee Stock Purchase Plan

In conjunction with the completion of its IPO, the Company adopted the 2015 Employee Stock Purchase Plan (“ESPP”). The ESPP has 441,165 shares authorized for future issuance. The number of authorized shares under the ESPP is subject to increase on an annual basis. The ESPP allows eligible employees to purchase shares of common stock at a discount through payroll deductions of up to 15% of their eligible compensation subject to plan limitations. The ESPP provides for a 24-month offering period comprised of four purchase periods of approximately six months. Employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s common stock (i) at the date of commencement of the offering period or (ii) at the last day of the purchase period. The offering periods are scheduled to start on the first trading day on or after March 15 and September 15 of each year, except for the first offering period, which commenced on the first trading day upon the completion of the Company’s IPO, or July 17, 2015, and ends on September 15, 2017. In the three and six months ended July 31, 2015, the Company recorded stock-based compensation expense of $18,000 related to the ESPP. No shares have been purchased by employees under the ESPP during the three and six months ended July 31, 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 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, 2015		1,893,239		$	3.85		8.40	$	10,109
Options granted		355,448			13.17
Options exercised		(48,758	)		0.38
Options canceled		(14,911	)		4.38
Balance, July 31, 2015		2,185,018			5.44		8.26	$	16,899
Vested and exercisable, July 31, 2015		596,737		$	0.63		5.23	$	7,193
Vested and expected to vest, July 31, 2015		1,989,485		$	4.19		8.18	$	15,470

Aggregate intrinsic value represents the difference between the exercise price of the options to purchase common stock and the fair market value of the Company’s common stock. The aggregate intrinsic value of options exercised for the three months ended July 31, 2015 and 2014 was $0.5 million and $0.3 million, respectively, and $0.6 million and $0.4 million for the six months ended July 31, 2015 and 2014, respectively.

Restricted Stock Units

Restricted Stock Units (RSUs) were granted to non-employee board members and are subject to a time-based vesting condition, which is one year.

A summary of the Company’s RSU activity and related information for the six months ended July 31, 2015 is as follows:

	Number of Shares issued under the 2015 Plan		Weighted Average Grant-Date Fair Value Per Share
Balance as of January 31, 2015		—	$	—
RSUs granted		67,305		13.00
RSUs vested		—		—
RSUs canceled		—		—
Balance as of July 31, 2015		67,305	$	13.00

Common Stock Warrants

A summary of the Company’s warrants to purchase common stock activity and related information for the six months ended July 31, 2015 is as follows:

	Common Warrants Outstanding
Balance, January 31, 2015		87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO		87,325
Less: Common warrants exercised to common stock		(9,152	)
Less: Common warrants terminated		(2,046	)
Balance, July 31, 2015		163,955

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

- Definition

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

+ References

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

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 5
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Subparagraph (SAB TOPIC 4.C)
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

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

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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

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

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

+ Details

Stock-Based Compensation

6 Months Ended

Jul. 31, 2015

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,
	2015		2014		2015		2014
Cost of revenue	$	65	$	5	$	123	$	9
Research and development		73		7		129		12
Sales and marketing		239		23		456		38
General and administrative		361		19		581		36
Total stock-based compensation	$	738	$	54	$	1,289	$	95

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2015		2014		2015		2014
Stock Options	$	691	$	54	$	1,242	$	95
Restricted Stock Units		29		—		29		—
Employee Stock Purchase Plan		18		—		18		—
Total stock-based compensation	$	738	$	54	$	1,289	$	95

As of July 31, 2015, there was $7.6 million, $0.8 million and $1.0 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 3.1 years, 1.0 year and 1.4 years, respectively.

Total outstanding non-employee stock options were 87,199 and 13,064 at July 31, 2015 and 2014, respectively. The non-employee stock-based compensation expense 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.

For the three and six months ended July 31, 2015 and 2014 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	2014	2015	2014
Stock Options:
Expected volatility	54%-59%	73%-79%	54% - 62%	73%-81%
Expected term (in years)	5.3-6.1	5.5-6.1	5.3-6.1	5.5-6.1
Risk-free interest rate	1.7%-1.9%	1.9%-2.0%	1.6%-1.9%	1.8%-2.0%
Dividend yield	— %	— %	— %	— %

For the three and six months ended July 31, 2015 and 2014 the fair value of ESPP was estimated using the following assumptions:

	Three Months Ended July 31,		Six Months Ended July 31,
	2015	2014	2015	2014
ESPP:
Expected volatility	35%-43%	— %	35%-43%	— %
Expected term (in years)	0.7-2.2	—	0.7-2.2	—
Risk-free interest rate	0.1%-0.7%	— %	0.1%-0.7%	— %
Dividend yield	— %	— %	— %	— %

Early Exercise of Common Stock

During the three and six months ended July 31, 2014, the Company issued 26,393 and 63,893 shares, respectively, of common stock following the exercise of common stock options prior to their vesting dates, or early exercises. The Company did not issue any shares during the three and six months ended July 31, 2015 that were early exercised. The amounts received from all such early exercises is recorded in accrued expenses on the consolidated balance sheets and reclassified to stockholders’ equity (deficit) as the options vest. The unvested shares are subject to the Company’s repurchase right at the original purchase price, which lapses over the vesting term of the original option grant. As of July 31, 2015 and January 31, 2015, the aggregate price of shares subject to repurchase recorded in accrued expenses and other long-term liabilities totaled $0.3 million and $0.3 million, respectively.

Income Taxes	6 Months Ended
Income Taxes	Jul. 31, 2015
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, 2015, primarily due to unbenefited domestic losses. The Company recorded a $0.5 million benefit in the three and six months ended July 31, 2014 arising from the acquisition of Talkatone, Inc. The Company continues to maintain a full valuation allowance against its net deferred tax assets. At July 31, 2015, the Company had unrecognized tax benefits of $1.0 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 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, 2015 will significantly increase or decrease within the next 12 months. There was no interest expense or penalties related to unrecognized tax benefits recorded through July 31, 2015. 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, 2015

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

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

	Three Months Ended July 31,						Six Months Ended July 31,
	2015			2014			2015			2014
Numerator
Net loss	$	(3,403	)	$	(1,101	)	$	(7,338	)	$	(602	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		4,233,193			2,273,007			3,422,521			2,347,728
Basic and diluted net loss per share	$	(0.80	)	$	(0.48	)	$	(2.14	)	$	(0.26	)

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,
	2015		2014
Options to purchase common stock		2,185,018		873,379
Employee stock purchase plan		235,097		—
Convertible preferred stock		—		8,353,748
Warrants to purchase convertible preferred stock		—		192,009
Warrants to purchase common stock		163,955		34,908
Common stock subject to repurchase		335,114		606,711
Potential common shares excluded from diluted net loss per share		2,919,184		10,060,755

Defined Contribution Plans	6 Months Ended
Defined Contribution Plans	Jul. 31, 2015
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 $37,000 for the three months ended July 31, 2015 and July 31, 2014, respectively, and $0.1 million and $0.1 million for the six months ended July, 31, 2015 and July 31, 2014, respectively.

Subsequent Events	6 Months Ended
Subsequent Events	Jul. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events In August 2015, the Company entered into an agreement to lease 6,724 square feet of additional space in Palo Alto, California. The thirty month lease is scheduled to begin on September 1, 2015 and end on February 28, 2018. The base annual rent is initially set at approximately $17,482 per month. Total base rent payable over the lease period is estimated to be approximately $0.5 million. From August 1, 2015 to September 11, 2015, the Company granted options to purchase an aggregate of 70,000 shares of the Company’s common stock at a weighted average exercise price of $9.53 per share, and 914,050 RSUs.

Significant Accounting Policies (Policies)

6 Months Ended

Jul. 31, 2015

Accounting Policies [Abstract]

Reverse Stock Split

Initial Public Offering and Conversion of Preferred Stock

Use of Estimates

Comprehensive Loss

The Company does not have any components of comprehensive income (loss), as such the net loss for all periods reported equals comprehensive loss.

Concentration of Credit Risk

Concentration of Risk— The concentration of accounts receivable, net of allowance of returns of $0 and $0.1 million as of July 31, 2015 and January 31, 2015, respectively are as follows:

	As of
	July 31, 2015			January 31, 2015
Customer A		16	%		11	%
Customer B		14	%	*
Customer C	*				23	%
Customer D	*				10	%

* represents less than 10% during the period

There were no customers that individually exceeded 10% of our revenue during the three and six months ended July 31, 2015 and 2014.

Recent Accounting Pronouncements

Significant Accounting Policies (Tables)

6 Months Ended

Jul. 31, 2015

Accounting Policies [Abstract]

Concentration of Accounts Receivable

The concentration of accounts receivable, net of allowance of returns of $0 and $0.1 million as of July 31, 2015 and January 31, 2015, respectively are as follows:

	As of
	July 31, 2015			January 31, 2015
Customer A		16	%		11	%
Customer B		14	%	*
Customer C	*				23	%
Customer D	*				10	%

* represents less than 10% during the period

Fair Value Measurement (Tables)

6 Months Ended

Jul. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities at Fair Value

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

	Balance as of July 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Cash	$	156	$	—	$	—	$	156
Money market fund		59,017		—		—		59,017
Total Cash and Cash Equivalents	$	59,173	$	—	$	—	$	59,173

Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	798	$	798
Convertible preferred stock warrant liability		—		—		—		—
Total liabilities	$	—	$	—	$	798	$	798

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

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

Schedule of Changes in Level Three Fair Value Category

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

	Convertible Preferred Stock Warrant Liability			Acquisition-Related Contingent Consideration
Balance at January 31, 2015	$	1,217		$	1,695
Payout of consideration		—			(570	)
Issuance of shares		—			(451	)
Changes in fair value		442			124
Payment of preferred warrant liability upon IPO		(584	)		—
De-recognition of preferred warrant liability to additional paid-in capital		(1,075	)		—
Balance at July 31, 2015	$	—		$	798

Balance Sheet Components (Tables)

6 Months Ended

Jul. 31, 2015

Deferred Revenue Disclosure [Abstract]

Components of Deferred Revenue

The following table shows the components of deferred revenue (in thousands):

	July 31,		January 31,
	2015		2015
Deferred revenue:
Subscription and services	$	11,128	$	9,863
Product and other		2,884		4,523
Total deferred revenue		14,012		14,386
Less: current portion of deferred revenue		13,976		14,348
Deferred revenue, noncurrent portion included in other long-term liabilities	$	36	$	38

Inventory Disclosure [Abstract]

Components of Inventories

The following table shows the components of inventories (in thousands):

	July 31,		January 31,
	2015		2015
Finished goods	$	5,972	$	5,719
Raw material		1,249		2,362
Total inventory	$	7,221	$	8,081

Payables And Accruals [Abstract]

Components of Accrued Expenses

The following table shows the components of accrued expenses (in thousands):

	July 31,		January 31,
	2015		2015
Accrued regulatory fees and taxes	$	4,946	$	4,762
Accrued payroll and related expenses		2,410		2,022
Acquisition-related contingent consideration-current portion		797		1,027
Other accrued expenses		3,340		2,502
Total accrued expenses	$	11,493	$	10,313

Convertible Preferred Stock Warrant Liability (Tables)

6 Months Ended

Jul. 31, 2015

Summary of Warrants to Purchase Convertible Preferred Stock Outstanding

A summary of the Company’s warrants to purchase common stock activity and related information for the six months ended July 31, 2015 is as follows:

	Common Warrants Outstanding
Balance, January 31, 2015		87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO		87,325
Less: Common warrants exercised to common stock		(9,152	)
Less: Common warrants terminated		(2,046	)
Balance, July 31, 2015		163,955

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

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2015		2014		2015	2014
Assumptions:
Expected volatility		66%		70%	66%-70%		70%
Expected term (in years)	0-1.0		1.8-1.9		0-1.1	1.8-2.1
Risk-free interest rate	0%-0.3%			0.5%	0%-0.3%		0.5%
Dividend yield	— %		— %		— %	— %

Convertible Preferred Stock

Summary of Warrants to Purchase Convertible Preferred Stock Outstanding

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

			Fair value				Fair value				Fair value
	Warrants		of Warrants		Warrants		of Warrants		Warrants		of Warrants
	outstanding		Liabilities as of		outstanding		Liabilities as of		outstanding		Liabilities as of
	as of		January 31, 2015		as of		April 30, 2015		as of		July 31, 2015
	January 31, 2015		(in thousands)		April 30, 2015		(in thousands)		July 31,2015		(in thousands)
December 2010 warrant		70,287	$	474		70,287	$	726		—	$	—
April 2012, December 2012 and October 2014 warrants		66,026		374		66,026		611		—		—
May and June 2009 warrants		55,696		369		55,696		596		—		—
Total		192,009	$	1,217		192,009	$	1,933		—	$	—

- Definition

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

+ References + Details

Commitments and Contingencies (Table)

6 Months Ended

Jul. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Minimum Rental Commitments under Non-cancelable Leases

Minimum rental commitments under all non-cancelable leases with an initial term in excess of one year as of July 31, 2015, were as follows (in thousands):

	Capital			Operating
Year Ending July 31,	Leases			Leases
2016 (remaining six months)	$	357		$	775
2017		653			1,589
2018		—			1,202
2019		—			27
Total	$	1,010		$	3,593
Less: Amount representing interest		(50	)
Present value of lease payments		960
Less: Current portion		(668	)
Capital lease—net of current portion	$	292

Stockholders' Equity (Tables)

6 Months Ended

Jul. 31, 2015

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 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, 2015		1,893,239		$	3.85		8.40	$	10,109
Options granted		355,448			13.17
Options exercised		(48,758	)		0.38
Options canceled		(14,911	)		4.38
Balance, July 31, 2015		2,185,018			5.44		8.26	$	16,899
Vested and exercisable, July 31, 2015		596,737		$	0.63		5.23	$	7,193
Vested and expected to vest, July 31, 2015		1,989,485		$	4.19		8.18	$	15,470

Summary of Restricted Stock Units Activity

A summary of the Company’s RSU activity and related information for the six months ended July 31, 2015 is as follows:

	Number of Shares issued under the 2015 Plan		Weighted Average Grant-Date Fair Value Per Share
Balance as of January 31, 2015		—	$	—
RSUs granted		67,305		13.00
RSUs vested		—		—
RSUs canceled		—		—
Balance as of July 31, 2015		67,305	$	13.00

Summary of Warrants to Purchase Convertible Preferred Stock Outstanding

A summary of the Company’s warrants to purchase common stock activity and related information for the six months ended July 31, 2015 is as follows:

	Common Warrants Outstanding
Balance, January 31, 2015		87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO		87,325
Less: Common warrants exercised to common stock		(9,152	)
Less: Common warrants terminated		(2,046	)
Balance, July 31, 2015		163,955

- Definition

+ References + Details

Stock-Based Compensation (Tables)

6 Months Ended

Jul. 31, 2015

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,
	2015		2014		2015		2014
Cost of revenue	$	65	$	5	$	123	$	9
Research and development		73		7		129		12
Sales and marketing		239		23		456		38
General and administrative		361		19		581		36
Total stock-based compensation	$	738	$	54	$	1,289	$	95

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,
	2015		2014		2015		2014
Stock Options	$	691	$	54	$	1,242	$	95
Restricted Stock Units		29		—		29		—
Employee Stock Purchase Plan		18		—		18		—
Total stock-based compensation	$	738	$	54	$	1,289	$	95

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

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2015		2014		2015	2014
Assumptions:
Expected volatility		66%		70%	66%-70%		70%
Expected term (in years)	0-1.0		1.8-1.9		0-1.1	1.8-2.1
Risk-free interest rate	0%-0.3%			0.5%	0%-0.3%		0.5%
Dividend yield	— %		— %		— %	— %

Employee Stock Option

Assumptions Used to Estimate Fair Value of Employee Stock Options Grants Using Black-Scholes Option Pricing Model

For the three and six months ended July 31, 2015 and 2014 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	2014	2015	2014
Stock Options:
Expected volatility	54%-59%	73%-79%	54% - 62%	73%-81%
Expected term (in years)	5.3-6.1	5.5-6.1	5.3-6.1	5.5-6.1
Risk-free interest rate	1.7%-1.9%	1.9%-2.0%	1.6%-1.9%	1.8%-2.0%
Dividend yield	— %	— %	— %	— %

ESPP

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

For the three and six months ended July 31, 2015 and 2014 the fair value of ESPP was estimated using the following assumptions:

	Three Months Ended July 31,		Six Months Ended July 31,
	2015	2014	2015	2014
ESPP:
Expected volatility	35%-43%	— %	35%-43%	— %
Expected term (in years)	0.7-2.2	—	0.7-2.2	—
Risk-free interest rate	0.1%-0.7%	— %	0.1%-0.7%	— %
Dividend yield	— %	— %	— %	— %

Basic and Diluted Net Loss Per Share (Tables)

6 Months Ended

Jul. 31, 2015

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,
	2015			2014			2015			2014
Numerator
Net loss	$	(3,403	)	$	(1,101	)	$	(7,338	)	$	(602	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		4,233,193			2,273,007			3,422,521			2,347,728
Basic and diluted net loss per share	$	(0.80	)	$	(0.48	)	$	(2.14	)	$	(0.26	)

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,
	2015		2014
Options to purchase common stock		2,185,018		873,379
Employee stock purchase plan		235,097		—
Convertible preferred stock		—		8,353,748
Warrants to purchase convertible preferred stock		—		192,009
Warrants to purchase common stock		163,955		34,908
Common stock subject to repurchase		335,114		606,711
Potential common shares excluded from diluted net loss per share		2,919,184		10,060,755

Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)	6 Months Ended
	Jul. 31, 2015
Accounting Policies [Abstract]
Date of Incorporation of Company	Nov. 19, 2003

Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands				6 Months Ended
	Jul. 22, 2015 USD ($) $ / shares shares	Jul. 06, 2015	Dec. 31, 2010 USD ($) $ / shares shares	Jul. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2015 USD ($) $ / shares shares	Jun. 30, 2009 shares	May 31, 2009 shares
Summary Of Significant Accounting Policies [Line Items]
Reverse stock split ratio		0.5
Common stock, shares issued	2,612			16,684,686	2,515,065
Public offering price \| $ / shares	$ 13.00		$ 13.00
Net proceeds from issuance of common stock \| $				$ 58,848
Number of preferred stock converted	13,752
Common stock issued for conversion of preferred stock	6,542
Convertible preferred stock warrant liability settled \| $			$ 600
Warrant to purchase convertible preferred stock			70,287		76,630	34,397	21,299
Exercise price per share of warrants \| $ / shares	$ 4.70		$ 4.70		$ 6.04
Warrant exercised	21,529
Class of warrants or rights termination	556
Warrants issued	66,026
Common warrants were cash exercised	6,542
Net of allowance of returns \| $				$ 0	$ 100
Convertible Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Warrant to purchase convertible preferred stock	2,769					34,397	21,299
Class of warrants or rights termination	10,099
Common Stock
Summary Of Significant Accounting Policies [Line Items]
Warrant to purchase convertible preferred stock	87,828						21,299
Common warrants were exercised	4,100
Initial Public Offering
Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued	5,000,000			5,000,000
Public offering price \| $ / shares	$ 13.00			$ 13.00
Net proceeds from issuance of common stock \| $	$ 57,100
Underwriters discounts and commissions related to stock issuance \| $	4,500
Offering cost related to stock issuance \| $	$ 3,400
Common stock issued for conversion of preferred stock	525,109
Percentage of guaranteed conversion price	75.00%
Warrant to purchase convertible preferred stock	21,529
Exercise price per share of warrants \| $ / shares	$ 4.70
Initial Public Offering \| Series Alpha preferred stock and Series Alpha -1 preferred stock
Summary Of Significant Accounting Policies [Line Items]
Public offering price \| $ / shares	$ 13.00
Number of preferred stock converted	8,353,748
Initial Public Offering \| Series Alpha-1
Summary Of Significant Accounting Policies [Line Items]
Common stock issued for conversion of preferred stock	8,353,748
Initial Public Offering \| Series Beta Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Number of preferred stock converted	241,469
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 21.2028
Initial Public Offering \| Convertible Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock conversion ratio	1
Convertible preferred stock adjusted conversion price \| $ / shares	$ 9.75
Initial Public Offering \| Common Stock
Summary Of Significant Accounting Policies [Line Items]
Warrant to purchase convertible preferred stock	13,752

Significant Accounting Policies - Concentration of Accounts Receivable (Details) - Accounts Receivable - Customer Concentration Risk	6 Months Ended	12 Months Ended
	Jul. 31, 2015	Jan. 31, 2015
Customer A
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	11.00%
Customer B
Concentration Risk [Line Items]
Concentration risk percentage	14.00%
Customer C
Concentration Risk [Line Items]
Concentration risk percentage		23.00%
Customer D
Concentration Risk [Line Items]
Concentration risk percentage		10.00%

Fair value measurement - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jul. 31, 2015	Jan. 31, 2015	Jul. 22, 2015	Oct. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	Dec. 31, 2010
Fair Value Disclosures [Line Items]
Transfers into or out of the level 3 category	$ 0	$ 0
Exercise price per share of warrants		$ 6.04	$ 4.70				$ 4.70
Series Alpha Convertible Preferred Stock
Fair Value Disclosures [Line Items]
Exercise price per share of warrants				$ 4.70	$ 4.70	$ 4.70	$ 4.70
Initial Public Offering
Fair Value Disclosures [Line Items]
Exercise price per share of warrants			$ 4.70
Initial Public Offering \| Series Alpha Convertible Preferred Stock
Fair Value Disclosures [Line Items]
Initial public offering warrant to purchase, shares	70,287
Exercise price per share of warrants	$ 13.00
Warrants exercise price	$ 4.70
Total warrant liabilities	$ 600,000

Fair value measurement - Schedule of Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Assets:
Total Cash and Cash Equivalents	$ 59,173	$ 9,133
Liabilities:
Total liabilities	798	2,912
Cash
Assets:
Total Cash and Cash Equivalents	156	115
Money Market Funds
Assets:
Total Cash and Cash Equivalents	59,017	9,018
Level 1
Assets:
Total Cash and Cash Equivalents	59,173	9,133
Level 1 \| Cash
Assets:
Total Cash and Cash Equivalents	156	115
Level 1 \| Money Market Funds
Assets:
Total Cash and Cash Equivalents	59,017	9,018
Level 3
Liabilities:
Total liabilities	798	2,912
Acquisition-Related Contingent Consideration
Liabilities:
Total liabilities	798	1,695
Acquisition-Related Contingent Consideration \| Level 3
Liabilities:
Total liabilities	$ 798	1,695
Convertible Preferred Stock Warrant Liability
Liabilities:
Total liabilities		1,217
Convertible Preferred Stock Warrant Liability \| Level 3
Liabilities:
Total liabilities		$ 1,217

Fair value measurement - Schedule of Changes in Level Three Fair Value Category (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	$ 2,912
Payout of consideration	(124)	$ (93)
Issuance of shares	(451)	$ (338)
Ending Balance	798
Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,217
Acquisition-Related Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,695
Ending Balance	798
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	2,912
Ending Balance	798
Level 3 \| Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,217
Changes in fair value	442
Payment of preferred warrant liability upon IPO	(584)
De-recognition of preferred warrant liability to additional paid-in capital	(1,075)
Level 3 \| Acquisition-Related Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,695
Payout of consideration	(570)
Issuance of shares	(451)
Changes in fair value	124
Ending Balance	$ 798

Balance Sheet Components - Components of Inventories (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Inventory Disclosure [Abstract]
Finished goods	$ 5,972	$ 5,719
Raw material	1,249	2,362
Total inventory	$ 7,221	$ 8,081

Balance Sheet Components - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 14,012	$ 14,386
Less: current portion of deferred revenue	13,976	14,348
Deferred revenue, noncurrent portion included in other long-term liabilities	36	38
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	11,128	9,863
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 2,884	$ 4,523

Balance Sheet Components - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Payables And Accruals [Abstract]
Accrued regulatory fees and taxes	$ 4,946	$ 4,762
Accrued payroll and related expenses	2,410	2,022
Acquisition-related contingent consideration-current portion	797	1,027
Other accrued expenses	3,340	2,502
Total accrued expenses	$ 11,493	$ 10,313

Debt - Additional Information (Details) - USD ($)	1 Months Ended				3 Months Ended		6 Months Ended
Debt - Additional Information (Details) - USD ($)	Jul. 31, 2015	Jan. 31, 2015	Jul. 31, 2014	Dec. 31, 2012	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Jul. 22, 2015	Oct. 31, 2014	Apr. 30, 2012	Dec. 31, 2010	Jun. 30, 2009	May 31, 2009
Debt Instrument [Line Items]
Repayment of outstanding debt							$ 11,294,000	$ 733,000
Warrant to purchase convertible preferred stock		76,630										70,287	34,397	21,299
Exercise price per share of warrants		$ 6.04							$ 4.70			$ 4.70
Warrants, exercisable date		2025-01
Interest expense					$ 600,000	$ 100,000	900,000	100,000
Amortization of debt issuance costs					20,000	$ 13,000	64,000	$ 28,000
Write-off of non-cash deferred debt issuance costs					332,000		$ 332,000
Term Debt \| Secured Debt Agreement
Debt Instrument [Line Items]
Term loan											$ 4,000,000
Term loan fixed interest rate											5.75%
Debt instrument, maturity period							2015-09
Repayment of remaining balance	$ 300,000				300,000		$ 300,000
the Revolver
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	12,000,000				$ 12,000,000		$ 12,000,000
the Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity period				2014-12
Revolving line of credit, maximum borrowing amount		$ 12,000,000		$ 6,000,000
Interest rate				2.75%
Interest rate		6.00%
Borrowing under the revolving line of credit facility										$ 5,000,000
Repayment of outstanding debt	$ 5,000,000
the Revolver \| Revolving Credit Facility \| 2014 Amended Agreement
Debt Instrument [Line Items]
Debt instrument, maturity period			2016-07
New Line Of Credit
Debt Instrument [Line Items]
Proceeds from lines of credit		$ 10,000,000
Line of credit facility, current borrowing capacity		$ 5,000,000
Interest rate during period		11.00%
Credit facility, maturity date		Jan. 05, 2018
Line of credit, covenant terms							The Company’s credit agreements with its lender contain customary negative covenants that limit the ability to, among other things, incur additional indebtedness, grant liens, make investments, repurchase stock, pay dividends, transfer assets and merge or consolidate.

Convertible Preferred Stock Warrant Liability - Summary of Warrants to Purchase Convertible Preferred Stock Outstanding (Details) - USD ($) $ in Thousands	Apr. 30, 2015	Jan. 31, 2015
Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	$ 192,009	$ 192,009
Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	1,933	1,217
December 2010 warrant \| Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	70,287	70,287
December 2010 warrant \| Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	726	474
April 2012, December 2012 and October 2014 warrants \| Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	66,026	66,026
April 2012, December 2012 and October 2014 warrants \| Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	611	374
May and June 2009 warrants \| Warrants Outstanding
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	55,696	55,696
May and June 2009 warrants \| Fair Value Of Warrants Liabilities
Convertible Preferred Stock Warrant Liability [Line Items]
Convertible preferred stock outstanding	$ 596	$ 369

Convertible Preferred Stock Warrant Liability - Additional Information (Details) - USD ($)		1 Months Ended				3 Months Ended		6 Months Ended
	Jul. 22, 2015	Oct. 31, 2014	Dec. 31, 2012	Apr. 30, 2012	May 31, 2009	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Jan. 31, 2015	Dec. 31, 2010	Jun. 30, 2009
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock					21,299					76,630	70,287	34,397
Exercise price per share of warrants	$ 4.70									$ 6.04	$ 4.70
Payment for warrant holders								$ 600,000
Public offering price	$ 13.00										$ 13.00
Aggregate liability	$ 400,000
Warrants terminated	10,099
Gain on termination of warrants	$ 100,000
December 2010 warrant
Class Of Stock [Line Items]
Remeasurement gain (loss) from change in fair value of warrants						$ 100,000	$ (17,000)	(100,000)	$ (100,000)
May and June 2009 warrants
Class Of Stock [Line Items]
Remeasurement gain (loss) from change in fair value of warrants						$ 100,000	(5,000)	$ (100,000)	(48,000)
Initial Public Offering
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	21,529
Exercise price per share of warrants	$ 4.70
Public offering price	$ 13.00					$ 13.00		$ 13.00
Warrants terminated	10,099
Warrants issued					21,299
Series Alpha Convertible Preferred Stock
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock											70,287
Exercise price per share of warrants		$ 4.70	$ 4.70	$ 4.70							$ 4.70
Warrants issued to purchase convertible preferred stock		66,026	66,026	66,026
Aggregate liability	$ 700,000
Warrant conversion ratio	100.00%
Series Alpha Convertible Preferred Stock \| Minimum
Class Of Stock [Line Items]
Warrant expiry period								2022-04
Series Alpha Convertible Preferred Stock \| Maximum
Class Of Stock [Line Items]
Warrant expiry period								2022-12
Series Alpha Convertible Preferred Stock \| April 2012, December 2012 and October 2014 warrants
Class Of Stock [Line Items]
Remeasurement gain (loss) from change in fair value of warrants						$ (100,000)	$ (9,000)	$ (300,000)	$ (100,000)
Series Alpha Convertible Preferred Stock \| Initial Public Offering
Class Of Stock [Line Items]
Exercise price per share of warrants						$ 13.00		$ 13.00
Convertible Preferred Stock
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	2,769				21,299							34,397
Common Stock
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	87,828				21,299
Common Stock \| May and June 2009 warrants
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	2,769
Common Stock \| Initial Public Offering
Class Of Stock [Line Items]
Warrant to purchase convertible preferred stock	13,752

Convertible Preferred Stock Warrant Liability - Assumptions Used to Estimate Fair Value of Each Stock Option (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	66.00%	70.00%	66.00%	70.00%
Expected volatility, maximum			70.00%
Risk-free interest rate, minimum	0.00%	0.50%	0.00%	0.50%
Risk-free interest rate, maximum	0.30%		0.30%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	0 years	1 year 9 months 18 days	0 years	1 year 9 months 18 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	1 year	1 year 10 months 24 days	1 year 1 month 6 days	2 years 1 month 6 days

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Operating Leased Assets [Line Items]
Operating lease expiration date				2018-02
Rent expense		$ 300,000	$ 200,000	$ 600,000	$ 400,000
Non-cancelable purchase commitments		1,900,000		1,900,000
Contingent liabilities requiring accrual or disclosure		$ 0		$ 0
Lease Agreement One
Operating Leased Assets [Line Items]
Capital lease of computer equipment maturity date	2016-12
Right to purchase the equipment, amount	$ 1

Commitments and Contingencies - Minimum Rental Commitments under Non-cancelable Leases (Details) $ in Thousands	Jul. 31, 2015 USD ($)
Capital Leases
2016 (remaining six months)	$ 357
2017	653
Total	1,010
Less: Amount representing interest	(50)
Present value of lease payments	960
Less: Current portion	(668)
Capital lease—net of current portion	292
Operating Leases
2016 (remaining six months)	775
2017	1,589
2018	1,202
2019	27
Total	$ 3,593

Stockholders' Equity - Additional Information (Details)			3 Months Ended		6 Months Ended
Stockholders' Equity - Additional Information (Details)	Jul. 22, 2015 $ / shares shares	Jul. 06, 2015 $ / shares shares	Jul. 31, 2015 USD ($) $ / shares shares	Jul. 31, 2014 USD ($)	Jul. 31, 2015 USD ($) Peroid $ / shares shares	Jul. 31, 2014 USD ($)	Jan. 31, 2015 $ / shares shares	Dec. 31, 2010 $ / shares
Stockholders Equity Note Disclosure [Line Items]
Reverse stock split ratio		0.5
Preferred stock, shares outstanding			0		0		0
Common stock, shares authorized		100,000,000	100,000,000		100,000,000		13,000,000
Common stock, par value \| $ / shares		$ 0.0001	$ 0.0001		$ 0.0001		$ 0.0001
Preferred stock, shares authorized		10,000,000	10,000,000		10,000,000		0
Preferred stock, par value \| $ / shares		$ 0.0001	$ 0.0001		$ 0.0001		$ 0.0001
Common stock, shares outstanding			16,684,686		16,684,686		2,515,065
Common stock, shares issued	2,612		16,684,686		16,684,686		2,515,065
Preferred stock, shares issued			0		0		0
Stock-based compensation \| $			$ 738,000	$ 54,000	$ 1,289,000	$ 95,000
Exercise price per share of warrants \| $ / shares	$ 4.70						$ 6.04	$ 4.70
Maximum \| Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Exercise price per share of warrants \| $ / shares			$ 6.04		$ 6.04
Warrants expiration date					2025-01
Minimum \| Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Exercise price per share of warrants \| $ / shares			$ 4.70		$ 4.70
Warrants expiration date					2025-01
Employee Stock Option
Stockholders Equity Note Disclosure [Line Items]
Consecutive offering period terms					3 years 1 month 6 days
Stock-based compensation \| $			$ 691,000	54,000	$ 1,242,000	95,000
Employee stock option expiration period					10 years
Aggregate intrinsic value of options exercised \| $			$ 500,000	$ 300,000	$ 600,000	$ 400,000
Employee Stock Option \| Maximum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period					5 years
2015 Equity Incentive Plan
Stockholders Equity Note Disclosure [Line Items]
Maximum aggregate number of shares issued under the plan			4,433,102		4,433,102
Additional aggregate number of shares issued under the plan					2,205,828
Percentage of common stock outstanding					5.00%
Common stock available for future issuance			2,181,156		2,181,156
Initial Public Offering
Stockholders Equity Note Disclosure [Line Items]
Common stock, shares issued	5,000,000		5,000,000		5,000,000
Exercise price per share of warrants \| $ / shares	$ 4.70
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]
Shares authorized for future issuance			441,165		441,165
Percentage of eligible compensation subject to plan limitation			15.00%		15.00%
Consecutive offering period terms					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%
Stock-based compensation \| $			$ 18,000		$ 18,000
Number of shares issued under ESPP			0		0
Series Alpha preferred stock and Series Alpha -1 preferred stock
Stockholders Equity Note Disclosure [Line Items]
Stock conversion ratio	1.00%
Series Beta Preferred Stock
Stockholders Equity Note Disclosure [Line Items]
Preferred stock, shares outstanding	241,469
Common Stock \| Series Alpha preferred stock and Series Alpha -1 preferred stock
Stockholders Equity Note Disclosure [Line Items]
Convertible preferred stock converted into common stock	8,353,748
Common Stock \| Series Beta Preferred Stock
Stockholders Equity Note Disclosure [Line Items]
Convertible preferred stock converted into common stock	525,109

Stockholders' Equity - Summary of Stock Option Activity Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2015	Jan. 31, 2015
Number of Shares Underlying Outstanding Options
Number of Shares Underlying Outstanding Options, beginning balance	1,893,239
Number of Shares Underlying Outstanding Options, Options granted	355,448
Number of Shares Underlying Outstanding Options, Options exercised	(48,758)
Number of Shares Underlying Outstanding Options, Options canceled	(14,911)
Number of Shares Underlying Outstanding Options, Ending balance	2,185,018	1,893,239
Number of Shares Underlying Outstanding Options, Vested and exercisable	596,737
Number of Shares Underlying Outstanding Options, Vested and expected to vest	1,989,485
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance	$ 3.85
Weighted Average Exercise Price, Options granted	13.17
Weighted Average Exercise Price, Options exercised	0.38
Weighted Average Exercise Price, Options canceled	4.38
Weighted Average Exercise Price, Ending balance	5.44	$ 3.85
Weighted Average Exercise Price, Vested and exercisable	0.63
Weighted Average Exercise Price, Vested and expected to vest	$ 4.19
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term	8 years 3 months 4 days	8 years 4 months 24 days
Weighted Average Remaining Contractual Term, Vested and exercisable	5 years 2 months 23 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	8 years 2 months 5 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Beginning balance	$ 10,109
Aggregate Intrinsic Value, Ending balance	16,899	$ 10,109
Aggregate Intrinsic Value, Vested and exercisable	7,193
Aggregate Intrinsic Value, Vested and expected to vest	$ 15,470

Stockholders' Equity - Summary of RSU activity (Details) - Restricted Stock Units (RSUs)	6 Months Ended
	Jul. 31, 2015 $ / shares shares
Number of Shares issued under the 2015 Plan
Shares issued \| shares
Number of Shares issued, RSUs granted \| shares	67,305
Number of Shares issued, RSUs Ending Balance \| shares	67,305
Weighted-Average Grant-Date Fair Value Per Share
Weighted-Average Grant-Date Fair Value Per Share, Beginning Balance \| $ / shares
Weighted-Average Grant-Date Fair Value Per Share, RSUs granted \| $ / shares	$ 13.00
Weighted-Average Grant-Date Fair Value Per Share, Endinning Balance \| $ / shares	$ 13.00

Stockholders' Equity - Summary of Warrants to Purchase Common Stock Activity (Details) - Common Stock Warrants	6 Months Ended
	Jul. 31, 2015 shares
Class Of Warrant Or Right [Line Items]
Common Warrants Outstanding, Beginning Balance	87,828
Add: Conversion of Preferred Series Alpha warrants to common warrants on IPO	87,325
Less: Common warrants exercised to common stock	(9,152)
Less: Common warrants terminated	(2,046)
Common Warrants Outstanding, Endinning Balance	163,955

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, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	$ 738	$ 54	$ 1,289	$ 95
Cost of revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	65	5	123	9
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	73	7	129	12
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	239	23	456	38
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	$ 361	$ 19	$ 581	$ 36

Stock-Based Compensation - Stock-Based Compensation Expense by Award Type (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 738,000	$ 54,000	$ 1,289,000	$ 95,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	691,000	$ 54,000	1,242,000	$ 95,000
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	29,000		29,000
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 18,000		$ 18,000

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	87,199	13,064	87,199	13,064
Common stock, shares, Issued	0	26,393	0	63,893
Accrued expenses and other long-term liabilities	$ 0.3		$ 0.3		$ 0.3
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	7.6		$ 7.6
Stock-based compensation expenses recognized on straight line basis offering period			3 years 1 month 6 days
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	0.8		$ 0.8
Stock-based compensation expenses recognized on straight line basis offering period			1 year
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 1.0		$ 1.0
Stock-based compensation expenses recognized on straight line basis offering period			1 year 4 months 24 days

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Options Grants Using Black-Scholes Option Pricing Model (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	66.00%	70.00%	66.00%	70.00%
Risk-free interest rate, minimum	0.00%	0.50%	0.00%	0.50%
Expected volatility, maximum			70.00%
Risk-free interest rate, maximum	0.30%		0.30%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	0 years	1 year 9 months 18 days	0 years	1 year 9 months 18 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	1 year	1 year 10 months 24 days	1 year 1 month 6 days	2 years 1 month 6 days
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	54.00%	73.00%	54.00%	73.00%
Risk-free interest rate, minimum	1.70%	1.90%	1.60%	1.80%
Expected volatility, maximum	59.00%	79.00%	62.00%	81.00%
Risk-free interest rate, maximum	1.90%	2.00%	1.90%	2.00%
Employee Stock Option \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	5 years 3 months 18 days	5 years 6 months	5 years 3 months 18 days	5 years 6 months
Employee Stock Option \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of ESPP (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	66.00%	70.00%	66.00%	70.00%
Risk-free interest rate, minimum	0.00%	0.50%	0.00%	0.50%
Expected volatility, maximum			70.00%
Risk-free interest rate, maximum	0.30%		0.30%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	0 years	1 year 9 months 18 days	0 years	1 year 9 months 18 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	1 year	1 year 10 months 24 days	1 year 1 month 6 days	2 years 1 month 6 days
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	35.00%		35.00%
Risk-free interest rate, minimum	0.10%		0.10%
Expected volatility, maximum	43.00%		43.00%
Risk-free interest rate, maximum	0.70%		0.70%
ESPP \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	8 months 12 days		8 months 12 days
ESPP \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years 2 months 12 days		2 years 2 months 12 days

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Income Tax [Line Items]
Income tax benefit	$ 0	$ 502,000	$ 0	$ 502,000
Unrecognized tax benefits			1,000,000
Interest expense or penalties related to unrecognized tax benefits			$ 0
Talkatone
Income Tax [Line Items]
Income tax benefit		$ 500,000		$ 500,000

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, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Numerator
Net loss	$ (3,403)	$ (1,101)	$ (7,338)	$ (602)
Denominator
Weighted-average common shares for basic and diluted net loss per share	4,233,193	2,273,007	3,422,521	2,347,728
Basic and diluted net loss per share	$ (0.80)	$ (0.48)	$ (2.14)	$ (0.26)

- Definition

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

+ References + Details

Basic and Diluted Net Loss Per Share - Potential Shares of Common Stock Excluded from Diluted Weighted-Average Common Shares Outstanding (Details) - shares	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share	2,919,184	10,060,755	2,919,184	10,060,755
ESPP
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share	235,097		235,097
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share	2,185,018	873,379	2,185,018	873,379
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share		8,353,748		8,353,748
Common stock subject to repurchase
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share	335,114	606,711	335,114	606,711
Warrants to purchase convertible preferred stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share		192,009		192,009
Warrants to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share	163,955	34,908	163,955	34,908

Defined Contribution Plans - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Compensation costs	$ 100,000	$ 37,000	$ 100,000	$ 100,000

Subsequent Events - Additional Information (Details)	1 Months Ended		6 Months Ended	30 Months Ended
Subsequent Events - Additional Information (Details)	Sep. 11, 2015 $ / shares shares	Aug. 31, 2015 USD ($) ft²	Jul. 31, 2015 $ / shares shares	Feb. 28, 2018 USD ($)
Subsequent Event [Line Items]
Purchase of shares, options, grants in period			355,448
Purchase of common stock, options, grants in period, weighted average exercise price \| $ / shares			$ 13.17
Subsequent Event
Subsequent Event [Line Items]
Lease duration period		30 months
Initial monthly base rent \| $		$ 17,482
Base rent payable \| $				$ 500,000
Purchase of shares, options, grants in period	70,000
Purchase of common stock, options, grants in period, weighted average exercise price \| $ / shares	$ 9.53
Subsequent Event \| Palo Alto, California
Subsequent Event [Line Items]
Additional lease space agreement \| ft²		6,724
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Equity instruments other than options, grants in period			67,305
Restricted Stock Units (RSUs) \| Subsequent Event
Subsequent Event [Line Items]
Equity instruments other than options, grants in period	914,050