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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jul. 31, 2017	Aug. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2017
Document Fiscal Year Focus	2018
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	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,472,596

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 10,433	$ 3,990
Short-term investments	43,370	49,211
Accounts receivable, net	4,258	4,714
Inventories	6,831	5,830
Deferred inventory costs	1,196	1,620
Prepaid expenses and other current assets	1,850	1,891
Total current assets	67,938	67,256
Property and equipment, net	4,496	4,176
Intangible assets, net	373	537
Goodwill	1,117	1,117
Other assets	168	252
Total assets	74,092	73,338
Current liabilities:
Accounts payable	7,262	5,857
Accrued expenses	11,450	11,579
Deferred revenue	15,585	15,521
Total current liabilities	34,297	32,957
Other liabilities	498	561
Total liabilities	34,795	33,518
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock $0.0001 par value: 10,000,000 shares authorized; no shares issued and outstanding on July 31, 2017 and January 31, 2017, respectively.
Common stock $0.0001 par value: 100,000,000 shares authorized; 18,461,549 and 17,995,555 shares issued and outstanding on July 31, 2017 and January 31, 2017, respectively.	2	2
Additional paid-in capital	124,140	117,639
Accumulated other comprehensive loss	(20)	(11)
Accumulated deficit	(84,825)	(77,810)
Total stockholders’ equity	39,297	39,820
Total liabilities and stockholders’ equity	$ 74,092	$ 73,338

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares	Jul. 31, 2017	Jan. 31, 2017
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	18,461,549	17,995,555
Common stock, shares outstanding	18,461,549	17,995,555

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenue:
Subscription and services	$ 25,206	$ 22,417	$ 49,306	$ 43,907
Product and other	2,981	3,077	6,459	6,046
Total revenue	28,187	25,494	55,765	49,953
Cost of revenue:
Subscription and services	7,814	7,444	15,563	14,715
Product and other	3,792	3,501	7,588	7,040
Total cost of revenue	11,606	10,945	23,151	21,755
Gross profit	16,581	14,549	32,614	28,198
Operating expenses:
Sales and marketing	9,245	8,578	18,399	16,673
Research and development	7,263	5,839	13,884	11,580
General and administrative	3,865	3,545	7,621	7,400
Total operating expenses	20,373	17,962	39,904	35,653
Loss from operations	(3,792)	(3,413)	(7,290)	(7,455)
Other income (expense):
Interest income (expense), net	136	100	258	164
Other income (expense), net	33	(27)	17	(5)
Net loss	$ (3,623)	$ (3,340)	$ (7,015)	$ (7,296)
Net loss per share of common stock:
Basic and diluted	$ (0.20)	$ (0.19)	$ (0.38)	$ (0.42)
Weighted-average number of shares used in per share amounts:
Basic and diluted	18,360,560	17,280,985	18,246,457	17,180,671

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (3,623)	$ (3,340)	$ (7,015)	$ (7,296)
Other comprehensive (loss) income:
Unrealized gain (loss) on short-term investments	3	12	(9)	25
Comprehensive loss	$ (3,620)	$ (3,328)	$ (7,024)	$ (7,271)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Net loss	$ (7,015,000)	$ (7,296,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation expense	6,091,000	4,873,000
Depreciation and amortization	1,095,000	822,000
Amortization of intangible assets	164,000	182,000
Other non-cash expense, net		(3,000)
Changes in operating assets and liabilities:
Accounts receivable, net	456,000	1,131,000
Inventories	(1,001,000)	447,000
Deferred inventory costs	424,000	(24,000)
Prepaid expenses and other assets	135,000	217,000
Accounts payable and accrued expenses	1,049,000	(1,087,000)
Other liabilities	(3,000)	(22,000)
Deferred revenue	37,000	176,000
Net cash provided by (used in) operating activities	1,432,000	(584,000)
Cash flows from investing activities:
Purchases of short-term investments	(20,544,000)	(33,115,000)
Proceeds from maturity of short-term investments	25,333,000	10,950,000
Proceeds from sale of short-term investments	900,000	3,016,000
Purchases of property and equipment	(1,063,000)	(1,030,000)
Net cash provided by (used in) investing activities	4,626,000	(20,179,000)
Cash flows from financing activities:
Repayment of debt and capital leases		(628,000)
Payment of acquisition related earn-out		(100,000)
Proceeds from issuance of common stock related to employee stock benefit plans	888,000	790,000
Net cash provided by financing activities	385,000	62,000
Net increase (decrease) in cash and cash equivalents	6,443,000	(20,701,000)
Cash and cash equivalents at beginning of period	3,990,000	27,413,000
Cash and cash equivalents at end of period	10,433,000	6,712,000
Restricted stock units
Cash flows from financing activities:
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (503,000)	$ 0

Description of Business and Summary of Significant Accounting Policies

6 Months Ended

Jul. 31, 2017

Accounting Policies [Abstract]

Description of Business and Summary of Significant Accounting Policies

1. Description of Business and Summary of Significant Accounting Policies

Description of Business

Ooma, Inc. (the “Company”) is a leading provider of innovative communications solutions and other connected services to small business, home, and mobile users. The Company’s unique hybrid Software-as-a-Service (“SaaS”) platform, consisting of its proprietary cloud, on-premises appliances, mobile applications, and end-point devices, provides the connectivity and functionality that enables solutions. The Company’s communications solutions deliver its proprietary high-definition (“HD”) voice quality, advanced features, and integration with mobile devices, at extremely competitive pricing and value. The Company’s platform helps create smart workplaces and homes by providing value-added communications and other connected services and by integrating end-point devices to enable the Internet of Things. The Company’s platform and solutions have the power to provide communications, productivity, automation, monitoring, safety, security, and networking infrastructure applications to our users. The Company was incorporated in Delaware on November 19, 2003 and is headquartered in Palo Alto, California.

Basis of Presentation

These unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended January 31, 2017.

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, 2018. The condensed consolidated balance sheet as of January 31, 2017 included herein was derived from the audited financial statements as of that date.

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

Use of Estimates

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

Concentration of Risk

The concentration of accounts receivable as of July 31, 2017 and January 31, 2017, respectively are as follows:

	As of
	July 31, 2017		January 31, 2017
Customer A		12%	*
Customer B	*			11%

*	Represented less than 10% of accounts receivable, net at the end of respective periods

There were no customers that individually exceeded 10% of revenue during the three and six months ended July 31, 2017 and 2016.

Secondary Offerings

In January 2017 and March 2017, the Company completed two secondary offerings, in which certain stockholders of the Company affiliated with Worldview Technology Partners (the “Selling Stockholders”) sold an aggregate of 3,275,000 and 3,290,483 shares of their holdings in the Company’s common stock at a public offering price at $8.65 per share and $8.85 per share, respectively. After the offerings Worldview Technology Partners owned less than 1% of the Company’s outstanding voting securities. The Company did not receive any of the proceeds from the offerings.

Summary of Significant Accounting Policies

There have been no material changes to the Company's significant accounting policies as described in its Annual Report on Form 10-K for the year ended January 31, 2017.

Recently Adopted Accounting Standard

In August 2014, the Financial Accounting Standards Board (“FASB”) issued ASU 2014-15 (ASC 205), Disclosure of Uncertainties About an Entity’s Ability to Continue as a Going Concern. The new standard provides guidance around management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. Early adoption is permitted. The Company adopted ASU 2014-15 during the first quarter of fiscal 2018. The adoption of this standard had no impact on the Company’s condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

In May 2017, the FASB issued ASU 2017-09, Compensation — Stock Compensation (Topic 718), Scope of Modification Accounting, which provides guidance on the changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting under Topic 718. The guidance is effective for the Company in the first quarter of fiscal 2019. Early adoption is permitted. The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements.

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

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

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which affects any entity that either enters into contracts with customers to transfer goods and services or enters into contracts for the transfer of nonfinancial assets. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services, and requires expanded qualitative and quantitative disclosures relating to the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and estimates used by management.

In August 2015, the FASB issued ASU 2015-14 and approved a one-year deferral of the effective date of ASU 2014-09. In March 2016, April 2016 and May 2016, the FASB issued ASU 2016-08, ASU 2016-10 and ASU 2016-12, respectively that clarify the implementation guidance on principal versus agent considerations, identification of performance obligations, collectability criterion and noncash consideration of the new standard. ASU 2014-09 will become effective for the Company in the first quarter of fiscal 2019. Early adoption is permitted and the new standard can be adopted by using (i) a full retrospective approach for all periods presented in the period of adoption or (ii) a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures.

The Company is evaluating the impact of the new standard on its accounting policies, processes, and system requirements. A decision regarding the adoption method has not been finalized at this time. The Company's final determination will depend on a number of factors, such as the significance of the impact of the new standard on our financial results, system readiness and its ability to accumulate and analyze the information necessary to assess the impact on prior period financial statements, as necessary. To date, the Company has completed some preliminary work of analyzing the standard’s impact on the Company’s contract portfolio, comparing historical accounting policies and practices to the requirements of the new standard and identifying potential differences from applying the requirements of the new guidance. While the Company is still in the process of evaluating the full impact of the adoption on its consolidated financial statements and related disclosures, the guidance will impact the way the Company recognizes its revenue for sales made through its partners. Currently, the revenue is recognized on a sell-through basis and upon adoption of the new guidance this practice will change to recognition of revenue on a sell-in basis. As part of this evaluation the Company has also considered the impact of the guidance ASC 340 Other Assets and Deferred Costs, and the interpretations of the FASB Transition Resource Group for Revenue Recognition ("TRG") from their November 7, 2016 meeting with respect to capitalization and amortization of incremental costs of obtaining a contract. As a result of this new guidance, the Company preliminarily believes that it will capitalize certain costs of obtaining a contract, including additional sales commissions, as interpreted by the TRG, requires the capitalization of all incremental costs that the Company incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained, provided it expects to recover the costs. Under the Company's current accounting policy, it expenses the commission costs immediately as incurred. The Company does not plan to early adopt this guidance.

Fair Value Measurement

6 Months Ended

Jul. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurement

2. Fair Value Measurement

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

Level 1:

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

Level 2:

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

Level 3:

Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities and which reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

The Company’s financial instruments consisted of Level 1 and Level 2 assets as of July 31, 2017 and January 31, 2017.

There were no transfers into or out of the Level 3 category during the six months ended July 31, 2017.

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

	As of July 31, 2017
	Level 1		Level 2		Total
Assets:
Cash and cash equivalents:
Money market funds	$	4,513	$	—	$	4,513
Commercial paper		—	$	1,799		1,799
U.S. agency securities		—		750		750
Total cash equivalents	$	4,513	$	2,549	$	7,062
Cash						3,371
Total cash and cash equivalents					$	10,433

Short-term investments:
U.S. government securities	$	14,418	$	—	$	14,418
Corporate debt securities		—		20,269		20,269
Commercial paper		—		4,038		4,038
U.S. agency securities		—		3,743		3,743
Asset-backed securities		—		902		902
Total short-term investments	$	14,418	$	28,952	$	43,370

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

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

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

- Definition

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

+ References + Details

Short-term Investments

6 Months Ended

Jul. 31, 2017

Investments Debt And Equity Securities [Abstract]

Short-term Investments

3. Short-term Investments

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

	As of July 31, 2017
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	20,278	$	(11	)	$	2	$	20,269
Commercial paper		4,038		—			—		4,038
U.S. agency securities		3,746		(3	)		—		3,743
U.S. government securities		14,425		(7	)		—		14,418
Asset-backed securities		903		(1	)		—		902
Total short-term investments	$	43,390	$	(22	)	$	2	$	43,370

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

The gross realized gains and losses related to the Company’s short-term investments were not material for the three and six months ended July 31, 2017 and 2016, respectively.

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

	As of July 31, 2017				As of January 31, 2017
	Amortized Value		Fair Value		Amortized Value		Fair Value
One year or less	$	38,365	$	38,347	$	44,806	$	44,794
Over one year and less than two years		5,025		5,023		4,416		4,417
Total	$	43,390	$	43,370	$	49,222	$	49,211

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

	As of July 31, 2017					As of January 31, 2017
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	20,269	$	(11	)	$	18,436	$	(20	)
U.S. government securities		12,683		(7	)		17,798		(2	)
U.S. agency securities		3,743		(3	)		5,777		—
Asset-backed securities		902		(1	)		—		—
Total	$	37,597	$	(22	)	$	42,011	$	(22	)

The Company reviews the individual securities in its portfolio to determine whether a decline in a security’s fair value below the amortized cost basis is other-than-temporary. The Company determined that as of July 31, 2017 and January 31, 2017, there were no investments in its portfolio that were other-than-temporarily impaired. The Company does not intend to sell any of these investments, and it is not more likely than not that the Company would be required to sell these investments before recovery of their amortized cost basis, which may be at maturity.

Balance Sheet Components

6 Months Ended

Jul. 31, 2017

Balance Sheet Components [Abstract]

Balance Sheet Components

4. Balance Sheet Components

Inventories

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

	July 31,		January 31,
	2017		2017
Finished goods	$	5,809	$	4,847
Raw material		1,022		983
Total inventory	$	6,831	$	5,830

Deferred Revenue

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

	July 31,		January 31,
	2017		2017
Deferred revenue:
Subscription and services	$	14,429	$	13,770
Product and other		1,638		2,260
Total deferred revenue		16,067		16,030
Less: current portion of deferred revenue		15,585		15,521
Deferred revenue, noncurrent portion included in other liabilities	$	482	$	509

Accrued Expenses

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

	July 31,		January 31,
	2017		2017
Accrued regulatory fees and taxes	$	5,185	$	4,315
Accrued payroll and related expenses		3,857		4,546
Other accrued expenses		2,408		2,718
Total accrued expenses	$	11,450	$	11,579

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jul. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	5. Commitments and Contingencies Leases and Purchase Commitments The Company leases office space in Palo Alto and Newark, California under operating leases. As of July 31, 2017, the Company had $0.6 million outstanding under operating leases with lease periods expiring through November 2020. Rent expense was $0.4 million and $0.6 million for the three months ended July 31, 2017 and 2016, respectively, and $0.8 million and $1.1 million for the six months ended July 31, 2017 and 2016, respectively. As of July 31, 2017, non-cancelable purchase commitments were $2.8 million. Legal Proceedings Oregon Litigation On August 30, 2016 the Oregon Department of Revenue (the “DOR”) issued tax assessments against the Company for the Oregon Emergency Communications Tax (the “Tax”), which the DOR alleges Ooma should have collected from its subscribers in Oregon and remitted to the DOR during the period starting on January 1, 2013 and ending on March 31, 2016 (collectively, the “Assessments”). On November 28, 2016 the Company filed a complaint in the Oregon Tax Court, asserting that the Assessments against Ooma are in violation of applicable Oregon law and are barred by the United States Constitution, and asking the Oregon Tax Court to abate the Assessments in full (the “Complaint”, and such dispute, the “Oregon Tax Litigation”). On February 10, 2017, the DOR filed an answer to the Compliant, and during April of 2017 the Company voluntarily participated in an informal discovery process by providing certain information and documents to the DOR. The Company believes that the Commerce Clause of the United States Constitution bars the application of the Tax to the Company, since the Company has no employees, property or other indicia of a “substantial nexus” with the State of Oregon, and therefore the application of the Tax against Ooma and the Assessments are barred by the United States Constitution. The Company will continue to vigorously litigate the Complaint in pursuit of the full abatement of the Assessments. Deep Green Wireless Litigation On June 8, 2016, plaintiff Deep Green Wireless LLC filed a complaint in the U.S. District Court for the Eastern District of Texas against Ooma, Inc., alleging infringement of U.S. Patent No. RE42,714 (the “Deep Green Wireless Patent”, and such litigation, the “Deep Green Wireless Litigation”). The complaint seeks unspecified monetary damages, costs, attorneys’ fees and other appropriate relief. On July 29, 2016 the Company filed its answer, affirmative defenses and counterclaims, on August 2, 2016 the Company filed a motion to transfer the case to the Northern District of California, and on February 21, 2017 magistrate judge Roy S. Payne granted the Company’s motion to transfer the case. On June 8, 2017 the Company filed a motion with the United States Patent Trial and Appeal Board for inter partes review of the Deep Green Wireless Patent. Based upon its assessment, the Company does not believe that its products infringe any valid or enforceable claim of the aforementioned patent, and plans to continue vigorously defending against the plaintiff’s claim. Securities Litigation On January 14, 2016, Michael Barnett filed a purported stockholder class action in the San Mateo County Superior Court of the State of California (Case No. CIV536959) against Ooma, certain of its officers and directors, and certain of the underwriters of its Initial Public Offering on July 17, 2015 (the “IPO”). Since that time two additional purported class actions making substantially the same allegations against the same defendants were filed, and on May 18, 2016 all three complaints were combined into a “consolidated complaint” filed in the same court (the “Securities Litigation”). The consolidated complaint purports to be brought on behalf of all persons who purchased shares of common stock in its IPO in reliance upon the Registration Statement and Prospectus the Company filed with the Securities and Exchange Commission (the “SEC”). The consolidated complaint alleges that Ooma and the other defendants violated the Securities Act of 1933, as amended (the “Securities Act”) by issuing the Registration Statement and Prospectus, which the plaintiffs allege contained material misstatements and omissions in violation of Sections 11, 12(a)(2) and 15 of the Securities Act. The plaintiffs seek class certification, compensatory damages, attorneys’ fees and costs, rescission or a rescissory measure of damages, equitable and/or injunctive relief, and such other relief as the court may deem proper. On July 1, 2016 Ooma filed its answer to the complaint, and on August 26, 2016 Ooma filed a motion for judgment on the pleadings, and on January 5th, 2017, the Court issued an order in response to such motion, granting Ooma’s motion to dismiss the claims pursuant to Sections12(a)(2) and 15 of the Securities Act, with leave to amend, and denying Ooma’s motion to dismiss the claims pursuant to Section 11 of the Securities Act. The parties participated in a confidential mediation session on August 4, 2017 that did not result in a resolution of the Securities Litigation. On August 28, 2017 the plaintiffs filed a motion to amend the consolidated complaint. Ooma believes that the plaintiffs’ claims are without merit and is vigorously defending against the Securities Litigation. Berks County Litigation On January 21, 2016 the County of Berks, Pennsylvania filed a lawsuit in the Berks County Court of Common Pleas naming the Company and 113 other telephone service providers as defendants (the “Berks County Litigation”), alleging breach of fiduciary duty, fraud, and negligent misrepresentation in connection with alleged violations of the Pennsylvania 911 Emergency Communication Services Act, 35 Pa.C.S.A. §5301 et seq. (“PA 911 Act”) for failure to collect from subscribers and remit certain fees pursuant to the PA 911 Act. The plaintiff seeks a declaratory judgment that Ooma must comply with the PA 911 Act, compensatory and punitive damages, attorneys’ fees and costs, equitable and/or injunctive relief and such other relief as the court may deem proper. On May 17, 2016 the court issued an order overruling the defendants’ joint preliminary objections, which are, in essence, the Pennsylvania equivalent of a motion to dismiss. Notwithstanding such adverse order, the Company believes that the Commerce Clause of the United States Constitution bars the application of the PA 911 Act to the Company, since the Company has no employees, property or other indicia of a “substantial nexus” with the State of Pennsylvania, and therefore the plaintiff’s claims are without merit. The Company intends to continue vigorously defending this lawsuit. The Company is party to actions and proceedings incident to the Company’s business in the ordinary course of business, including litigation regarding its intellectual property, challenges to the enforceability or validity of its intellectual property, and claims that the Company’s products or services infringe on the intellectual property rights of others. The Company accrues a liability for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. In connection with the Oregon Litigation, Deep Green Wireless Litigation, Securities Litigation and Berks County Litigation, the Company has determined that the amount of any material loss or range of any material losses that is reasonably possible to result from each such proceeding is not reasonably estimable. Accordingly, no material reserves have been recorded in the Company’s condensed consolidated financial statements with respect to any of such litigations. Indemnification The Company enters into standard indemnification arrangements in the ordinary course of business. Pursuant to these arrangements, the Company indemnifies, holds harmless, and agrees to reimburse the indemnified parties for losses suffered or incurred by the indemnified party, in connection with any trade secret, copyright, patent or other intellectual property infringement claim by any third party with respect to the Company’s technology. The term of these indemnification agreements is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable because it involves claims that may be made against the Company in the future, but have not yet been made. The Company has entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company has director and officer insurance coverage that reduces the Company’s exposure and enables the Company to recover a portion of any future amounts paid. To date the Company has not incurred costs to defend lawsuits or settle claims related to these indemnification agreements. No liability associated with such indemnifications has been recorded to date.

Stockholders' Equity

6 Months Ended

Jul. 31, 2017

Equity [Abstract]

Stockholders' Equity

6. Stockholders’ Equity

Equity Award Plans

2015 Equity Incentive Plan

In June 2015, the Company amended and restated its 2005 Stock Plan (the “2005 Plan”) in the form of 2015 Equity Incentive Plan (the “2015 Plan”) which became effective immediately upon the effectiveness of the Company’s IPO. The terms of the 2005 Plan will continue to govern the terms and conditions of the outstanding awards previously granted thereunder.

The 2015 Plan provides for the grant of incentive stock options to its employees and any of its subsidiary corporations’ employees, and for the grant of non-statutory stock options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance units and performance shares to its employees, directors and consultants and its subsidiary corporations’ employees and consultants. The maximum aggregate number of shares that may be issued under the 2015 Plan is 6,638,930. In addition, the number of shares available for issuance under the 2015 Plan is subject to an annual increase on the first day of each of its fiscal years beginning with fiscal 2017, by an amount equal to the lessor of (i) 5% of the outstanding shares of its common stock as of the last day of its immediately preceding fiscal year; and (ii) such other amount as the Company’s Board may determine. The Company’s Board approved an increase of 902,436 shares and 854,483 shares of common stock for future issuance under the 2015 Plan in the first quarter of fiscal 2018 and 2017, respectively.

As of July 31, 2017, the Company had 780,068 shares available for future issuance.

Employee Stock Purchase Plan

The Company’s 2015 Employee Stock Purchase Plan (“ESPP”) was adopted and approved by the Company’s Board in July 2015 and 441,165 shares of common stock were initially authorized for future issuance. The number of authorized shares under the ESPP is subject to an annual increase. The Company’s Board approved an increase of 360,974 shares of common stock and 341,793 shares of common stock in the first quarter of fiscal 2018 and 2017, respectively. The ESPP allows eligible employees to purchase shares of common stock at a discount through payroll deductions of up to 15% of their eligible compensation subject to plan limitations. The ESPP provides for a 24-month offering period comprised of four purchase periods of approximately six months. Employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s common stock (i) at the date of commencement of the offering period or (ii) at the last day of the purchase period. The offering periods are scheduled to start on the first trading day on or after March 15 and September 15 of each year. During the six month ended July 31, 2017, the ESPP purchase resulted in the issuance of 150,633 shares of common stock at a weighted average purchase price of $5.34 per share.

The Company recorded stock-based compensation related to the ESPP of $0.3 million and $0.3 million, respectively, for the three months ended July 31, 2017 and 2016, and $0.6 million and $0.5 million, respectively, for the six months ended July 31, 2017 and 2016.

Stock Options

The following table summarizes the Company’s stock option activities for the six months ended July 31, 2017:

	Options Outstanding
	Number of					Weighted
	Shares			Weighted		Average		Aggregate
	Underlying			Average		Remaining		Intrinsic
	Outstanding			Exercise		Contractual Term		Value
	Options			Price		(Years)		(in thousands)
Balance as of January 31, 2017		1,777,365		$	5.74		7.0	$	7,864
Options granted		119,250			10.20
Options exercised		(20,637	)		4.04
Options canceled		(4,270	)		6.55
Balance as of July 31, 2017		1,871,708		$	6.04		6.7	$	5,748
Vested and exercisable, July 31, 2017		1,309,266		$	5.07		6.2	$	4,958
Vested and expected to vest, July 31, 2017		1,871,708		$	6.04		6.7	$	5,748

The aggregate intrinsic value of options exercised for the three months ended July 31, 2017 and 2016 was $29,000 and $0.6 million, respectively, and $0.1 million and $1.0 million for the six months ended July 31, 2017 and 2016, respectively. The weighted-average grant date fair value of options granted during the six months ended July 31, 2017 was $4.81 per share.

Restricted Stock Units

The following table summarizes the Company’s RSUs activities for the six months ended July 31, 2017:

	Number of Shares			Weighted-Average Grant-Date Fair Value Per Share		Weighted-Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2017		1,859,196		$	7.65		1.4	$	17,941
RSUs granted		1,051,605			10.02
RSUs vested		(309,165	)		7.33
RSUs canceled		(68,602	)		8.38
Balance as of July 31, 2017		2,533,034		$	8.65		1.4	$	21,022

The number of RSUs vested includes shares of common stock that the Company withheld on behalf of certain employees to satisfy the minimum statutory tax withholding requirements, as defined by the Company. The Company withheld 56,750 and 0 shares of common stock for an aggregate amount of $0.5 million and $0 for six months ended July 31, 2017 and July 31, 2016 respectively. The Company classified such amount as financing cash outflows in the condensed consolidated statements of cash flows. The Company canceled and returned these shares to the 2015 Plan, which are available under the plan terms for future issuance.

Common Stock Warrants

During the second quarter ended July 31, 2017, 38,315 common warrants were exercised net of the respective exercise price per warrant to 19,144 shares of common stock. The remaining common warrants were terminated due to non-exercise per the terms of the warrant agreement. As of July 31, 2017, the Company did not have any outstanding warrants.

Stock-Based Compensation

6 Months Ended

Jul. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

7. 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,
	2017		2016		2017		2016
Total cost of revenue	$	343	$	243	$	658	$	478
Sales and marketing		496		355		1,016		681
Research and development		1,148		863		2,216		1,807
General and administrative		1,133		938		2,201		1,907
Total stock-based compensation expense	$	3,120	$	2,399	$	6,091	$	4,873

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2017		2016		2017		2016
Stock options	$	598	$	630	$	1,190	$	1,314
Restricted stock units		2,214		1,512		4,320		3,020
Employee stock purchase plan		308		257		581		539
Total stock-based compensation expense	$	3,120	$	2,399	$	6,091	$	4,873

As of July 31, 2017, there was $2.5 million, $18.1 million and $0.6 million of unrecognized share-based compensation expense, related to unvested stock option grants, RSUs and ESPP, respectively, which will be recognized on a straight-line basis over the remaining weighted-average vesting periods of approximately 1.8 years, 3.0 years and 0.8 years, respectively.

Total outstanding non-employee stock options were 31,750 and 50,720 at July 31, 2017 and 2016, respectively. The total outstanding non-employee RSUs were 71,960 and 85,250 at July 31, 2017 and 2016, respectively. The non-employee stock-based compensation expense for the stock options and RSUs was not material for any of the periods presented.

The Company did not grant any stock options during the six months ended July 31, 2016. During fiscal first quarter 2018, the fair value of employee stock options grants was estimated using the Black–Scholes model with the following assumptions:

						Three and Six Months Ended July 31,
						2017
Stock Options:
Expected volatility						47%
Expected term (in years)						6.1
Risk-free interest rate						2.1%
Dividend yield						— %

For the three and six months ended July 31, 2017 and 2016, the fair value of the Company’s employee stock purchase plan was estimated using the Black – Scholes model with the following assumptions:

	Three Months Ended July 31,		Six Months Ended July 31,
	2017	2016	2017	2016
ESPP:
Expected volatility	35%-41%	44%-50%	35%-41%	44%-50%
Expected term (in years)	0.5-2.0	0.5-2.0	0.5-2.0	0.5-2.0
Risk-free interest rate	0.9%-1.3%	0.5%-1.0%	0.9%-1.3%	0.5%-1.0%
Dividend yield	— %	— %	— %	— %

Early Exercise of Common Stock

During the three and six months ended July 31, 2017, the Company issued 11,491 shares and 23,520 shares of common stock following the exercise of common stock options prior to their vesting dates, or early exercises. The amounts received from all such early exercises is recorded in accrued expenses and other long-term liabilities on the consolidated balance sheets and reclassified to stockholders’ equity as the options vest. The unvested shares are subject to the Company’s repurchase right at the original purchase price, which lapses over the vesting term of the original option grant. As of July 31, 2017 and January 31, 2017, the aggregate proceeds from exercises of common stock options subject to repurchase recorded in accrued expenses and other long-term liabilities totaled $0.1 million and $0.1 million, respectively. During the three and six months ended July 31, 2017 no common stock options were early exercised prior to their vesting.

Income Taxes	6 Months Ended
Income Taxes	Jul. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The Company did not record a provision or benefit for income taxes during the three and six months ended July 31, 2017 and 2016, respectively. The Company continues to maintain a full valuation allowance against its deferred tax assets. As of July 31, 2017, the Company had unrecognized tax benefits of $2.1 million, none of which would currently affect the Company's effective tax rate if recognized due to the Company's deferred tax assets being fully offset by a valuation allowance. The Company does not anticipate that the amount of unrecognized tax benefits relating to tax positions existing at July 31, 2017 will significantly increase or decrease within the next twelve months. There was no interest expense or penalties related to unrecognized tax benefits recorded through July 31, 2017. 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, 2017

Earnings Per Share [Abstract]

Basic and Diluted Net Loss Per Share

9. Basic and Diluted Net Loss Per Share

Basic and diluted net loss per share is calculated by dividing the net loss 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.

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,
	2017			2016			2017			2016
Numerator
Net loss	$	(3,623	)	$	(3,340	)	$	(7,015	)	$	(7,296	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		18,360,560			17,280,985			18,246,457			17,180,671
Basic and diluted net loss per share	$	(0.20	)	$	(0.19	)	$	(0.38	)	$	(0.42	)

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,
	2017		2016
Options to purchase common stock		1,871,708		1,869,783
Employee stock purchase plan		311,854		304,400
Restricted stock units		2,533,034		2,353,850
Warrants to purchase common stock		—		97,931
Common stock subject to repurchase		30,301		79,053
Potential shares excluded from diluted net loss per share		4,746,897		4,705,017

Defined Contribution Plans	6 Months Ended
Defined Contribution Plans	Jul. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Defined Contribution Plans	10. 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 for each of the three months ended July 31, 2017 and 2016, respectively, and $0.2 million for each of the six months ended July 31, 2017 and 2016, respectively

Related Party Transaction	6 Months Ended
Related Party Transaction	Jul. 31, 2017
Related Party Transactions [Abstract]
Related Party Transaction	11. Related Party Transaction One of the Company’s board members is affiliated with a professional firm that provides public relations services to the Company. The Company incurred expenses of approximately $0.1 million for each of the three months ended July 31, 2017 and 2016, respectively, and $0.1 million and $0.2 million for the six months ended July 31, 2017 and 2016, respectively for the services provided by the firm.

Subsequent Event	6 Months Ended
Subsequent Event	Jul. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	12. Subsequent Event On August 15, 2017, the Company sold Business Promoter to Xedia Networks, Inc., a New Jersey corporation. The Company did not receive any cash proceeds from this transaction. The Company is entitled to receive a quarterly earnout for the next five years up to a maximum of $4.5 million. The earnout will be recorded as a reduction to its General and Administrative expense on its consolidated statement of operations.

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

6 Months Ended

Jul. 31, 2017

Accounting Policies [Abstract]

Basis of Presentation

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

Use of Estimates

Concentration of Credit Risk

Concentration of Risk

The concentration of accounts receivable as of July 31, 2017 and January 31, 2017, respectively are as follows:

	As of
	July 31, 2017		January 31, 2017
Customer A		12%	*
Customer B	*			11%

*	Represented less than 10% of accounts receivable, net at the end of respective periods

There were no customers that individually exceeded 10% of revenue during the three and six months ended July 31, 2017 and 2016.

Secondary Offering

Secondary Offerings

Recently Adopted Accounting Standard

Recent Accounting Pronouncements Not Yet Adopted

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

6 Months Ended

Jul. 31, 2017

Accounting Policies [Abstract]

Concentration of Accounts Receivable

The concentration of accounts receivable as of July 31, 2017 and January 31, 2017, respectively are as follows:

	As of
	July 31, 2017		January 31, 2017
Customer A		12%	*
Customer B	*			11%

*	Represented less than 10% of accounts receivable, net at the end of respective periods

Fair Value Measurement (Tables)

6 Months Ended

Jul. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Financial Assets at Fair Value

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

	As of July 31, 2017
	Level 1		Level 2		Total
Assets:
Cash and cash equivalents:
Money market funds	$	4,513	$	—	$	4,513
Commercial paper		—	$	1,799		1,799
U.S. agency securities		—		750		750
Total cash equivalents	$	4,513	$	2,549	$	7,062
Cash						3,371
Total cash and cash equivalents					$	10,433

Short-term investments:
U.S. government securities	$	14,418	$	—	$	14,418
Corporate debt securities		—		20,269		20,269
Commercial paper		—		4,038		4,038
U.S. agency securities		—		3,743		3,743
Asset-backed securities		—		902		902
Total short-term investments	$	14,418	$	28,952	$	43,370

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

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

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

6 Months Ended

Jul. 31, 2017

Schedule Of Available For Sale Securities [Line Items]

Summary of Short-term Investments

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

	As of July 31, 2017
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	20,278	$	(11	)	$	2	$	20,269
Commercial paper		4,038		—			—		4,038
U.S. agency securities		3,746		(3	)		—		3,743
U.S. government securities		14,425		(7	)		—		14,418
Asset-backed securities		903		(1	)		—		902
Total short-term investments	$	43,390	$	(22	)	$	2	$	43,370

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

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

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

	As of July 31, 2017				As of January 31, 2017
	Amortized Value		Fair Value		Amortized Value		Fair Value
One year or less	$	38,365	$	38,347	$	44,806	$	44,794
Over one year and less than two years		5,025		5,023		4,416		4,417
Total	$	43,390	$	43,370	$	49,222	$	49,211

Schedule of Investments in Unrealized Loss Position

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

	As of July 31, 2017					As of January 31, 2017
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	20,269	$	(11	)	$	18,436	$	(20	)
U.S. government securities		12,683		(7	)		17,798		(2	)
U.S. agency securities		3,743		(3	)		5,777		—
Asset-backed securities		902		(1	)		—		—
Total	$	37,597	$	(22	)	$	42,011	$	(22	)

- Definition

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

+ References + Details

Balance Sheet Components (Tables)

6 Months Ended

Jul. 31, 2017

Balance Sheet Components [Abstract]

Components of Inventories

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

	July 31,		January 31,
	2017		2017
Finished goods	$	5,809	$	4,847
Raw material		1,022		983
Total inventory	$	6,831	$	5,830

Components of Deferred Revenue

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

	July 31,		January 31,
	2017		2017
Deferred revenue:
Subscription and services	$	14,429	$	13,770
Product and other		1,638		2,260
Total deferred revenue		16,067		16,030
Less: current portion of deferred revenue		15,585		15,521
Deferred revenue, noncurrent portion included in other liabilities	$	482	$	509

Components of Accrued Expenses

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

	July 31,		January 31,
	2017		2017
Accrued regulatory fees and taxes	$	5,185	$	4,315
Accrued payroll and related expenses		3,857		4,546
Other accrued expenses		2,408		2,718
Total accrued expenses	$	11,450	$	11,579

Stockholders' Equity (Tables)

6 Months Ended

Jul. 31, 2017

Equity [Abstract]

Summarizes of Stock Option Activities

The following table summarizes the Company’s stock option activities for the six months ended July 31, 2017:

	Options Outstanding
	Number of					Weighted
	Shares			Weighted		Average		Aggregate
	Underlying			Average		Remaining		Intrinsic
	Outstanding			Exercise		Contractual Term		Value
	Options			Price		(Years)		(in thousands)
Balance as of January 31, 2017		1,777,365		$	5.74		7.0	$	7,864
Options granted		119,250			10.20
Options exercised		(20,637	)		4.04
Options canceled		(4,270	)		6.55
Balance as of July 31, 2017		1,871,708		$	6.04		6.7	$	5,748
Vested and exercisable, July 31, 2017		1,309,266		$	5.07		6.2	$	4,958
Vested and expected to vest, July 31, 2017		1,871,708		$	6.04		6.7	$	5,748

Summarizes of Restricted Stock Units Activities

The following table summarizes the Company’s RSUs activities for the six months ended July 31, 2017:

	Number of Shares			Weighted-Average Grant-Date Fair Value Per Share		Weighted-Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2017		1,859,196		$	7.65		1.4	$	17,941
RSUs granted		1,051,605			10.02
RSUs vested		(309,165	)		7.33
RSUs canceled		(68,602	)		8.38
Balance as of July 31, 2017		2,533,034		$	8.65		1.4	$	21,022

Stock-Based Compensation (Tables)

6 Months Ended

Jul. 31, 2017

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

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2017		2016		2017		2016
Total cost of revenue	$	343	$	243	$	658	$	478
Sales and marketing		496		355		1,016		681
Research and development		1,148		863		2,216		1,807
General and administrative		1,133		938		2,201		1,907
Total stock-based compensation expense	$	3,120	$	2,399	$	6,091	$	4,873

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,
	2017		2016		2017		2016
Stock options	$	598	$	630	$	1,190	$	1,314
Restricted stock units		2,214		1,512		4,320		3,020
Employee stock purchase plan		308		257		581		539
Total stock-based compensation expense	$	3,120	$	2,399	$	6,091	$	4,873

ESPP

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

	Three Months Ended July 31,		Six Months Ended July 31,
	2017	2016	2017	2016
ESPP:
Expected volatility	35%-41%	44%-50%	35%-41%	44%-50%
Expected term (in years)	0.5-2.0	0.5-2.0	0.5-2.0	0.5-2.0
Risk-free interest rate	0.9%-1.3%	0.5%-1.0%	0.9%-1.3%	0.5%-1.0%
Dividend yield	— %	— %	— %	— %

Stock Options

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

During fiscal first quarter 2018, the fair value of employee stock options grants was estimated using the Black–Scholes model with the following assumptions:

						Three and Six Months Ended July 31,
						2017
Stock Options:
Expected volatility						47%
Expected term (in years)						6.1
Risk-free interest rate						2.1%
Dividend yield						— %

Basic and Diluted Net Loss Per Share (Tables)

6 Months Ended

Jul. 31, 2017

Earnings Per Share [Abstract]

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

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

	Three Months Ended July 31,						Six Months Ended July 31,
	2017			2016			2017			2016
Numerator
Net loss	$	(3,623	)	$	(3,340	)	$	(7,015	)	$	(7,296	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		18,360,560			17,280,985			18,246,457			17,180,671
Basic and diluted net loss per share	$	(0.20	)	$	(0.19	)	$	(0.38	)	$	(0.42	)

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,
	2017		2016
Options to purchase common stock		1,871,708		1,869,783
Employee stock purchase plan		311,854		304,400
Restricted stock units		2,533,034		2,353,850
Warrants to purchase common stock		—		97,931
Common stock subject to repurchase		30,301		79,053
Potential shares excluded from diluted net loss per share		4,746,897		4,705,017

Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares	Jan. 31, 2017 USD ($) $ / shares shares	Jul. 31, 2017 Customer	Jul. 31, 2016 Customer	Jul. 31, 2017 USD ($) Customer	Jul. 31, 2016 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Date of Incorporation of Company					Nov. 19, 2003
Number of customers that individually exceeded 10% of revenue \| Customer			0	0	0	0
Proceeds from offering					$ 888,000	$ 790,000
Secondary Offering
Summary Of Significant Accounting Policies [Line Items]
Proceeds from offering	$ 0	$ 0
Secondary Offering \| Maximum \| Worldview Technology Partners
Summary Of Significant Accounting Policies [Line Items]
Percentage of outstanding voting securities owned			1.00%		1.00%
Common Stock \| Secondary Offering
Summary Of Significant Accounting Policies [Line Items]
Common stock shares sold \| shares	3,290,483	3,275,000
Common stock shares sold, public offering price \| $ / shares	$ 8.85	$ 8.65

Description of Business and Summary of Significant Accounting Policies - Concentration of Accounts Receivable (Details) - Accounts Receivable - Customer Concentration Risk	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Customer A
Concentration Risk [Line Items]
Concentration risk percentage	12.00%
Customer B
Concentration Risk [Line Items]
Concentration risk percentage		11.00%

Fair Value Measurement - Additional Information (Details)	6 Months Ended
	Jul. 31, 2017 USD ($)
Fair Value Disclosures [Abstract]
Transfers into or out of the Level 3 category	$ 0

Fair Value Measurement - Schedule of Financial Assets at Fair Value (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Assets:
Total cash and cash equivalents	$ 10,433	$ 3,990
Total short-term investments	43,370	49,211
Commercial Paper
Assets:
Total short-term investments	4,038	5,386
U.S. Agency Securities
Assets:
Total short-term investments	3,743	5,777
Corporate Debt Securities
Assets:
Total short-term investments	20,269	18,436
U.S. Government Securities
Assets:
Total short-term investments	14,418	17,798
Asset-backed Securities
Assets:
Total short-term investments	902	1,814
Level 1
Assets:
Total short-term investments	14,418	17,798
Level 1 \| U.S. Government Securities
Assets:
Total short-term investments	14,418	17,798
Level 2
Assets:
Total short-term investments	28,952	31,413
Level 2 \| Commercial Paper
Assets:
Total short-term investments	4,038	5,386
Level 2 \| U.S. Agency Securities
Assets:
Total short-term investments	3,743	5,777
Level 2 \| Corporate Debt Securities
Assets:
Total short-term investments	20,269	18,436
Level 2 \| Asset-backed Securities
Assets:
Total short-term investments	902	1,814
Cash Equivalents
Assets:
Total cash and cash equivalents	7,062	951
Cash Equivalents \| Commercial Paper
Assets:
Total cash and cash equivalents	1,799
Cash Equivalents \| U.S. Agency Securities
Assets:
Total cash and cash equivalents	750
Cash Equivalents \| Money Market Funds
Assets:
Total cash and cash equivalents	4,513	951
Cash Equivalents \| Level 1
Assets:
Total cash and cash equivalents	4,513	951
Cash Equivalents \| Level 1 \| Money Market Funds
Assets:
Total cash and cash equivalents	4,513	951
Cash Equivalents \| Level 2
Assets:
Total cash and cash equivalents	2,549
Cash Equivalents \| Level 2 \| Commercial Paper
Assets:
Total cash and cash equivalents	1,799
Cash Equivalents \| Level 2 \| U.S. Agency Securities
Assets:
Total cash and cash equivalents	750
Cash
Assets:
Total cash and cash equivalents	$ 3,371	$ 3,039

Short-term Investments - Summary of Short-term Investment (Details) - Short-term Investments - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	$ 43,390	$ 49,222
Short-term Investments, Unrealized Losses	(22)	(22)
Short-term Investments, Unrealized Gains	2	11
Short-term Investments, Fair Value	43,370	49,211
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	20,278	18,455
Short-term Investments, Unrealized Losses	(11)	(20)
Short-term Investments, Unrealized Gains	2	1
Short-term Investments, Fair Value	20,269	18,436
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	4,038	5,386
Short-term Investments, Fair Value	4,038	5,386
U.S. Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	3,746	5,774
Short-term Investments, Unrealized Losses	(3)
Short-term Investments, Unrealized Gains		3
Short-term Investments, Fair Value	3,743	5,777
U.S. Government Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	14,425	17,793
Short-term Investments, Unrealized Losses	(7)	(2)
Short-term Investments, Unrealized Gains		7
Short-term Investments, Fair Value	14,418	17,798
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	903	1,814
Short-term Investments, Unrealized Losses	(1)
Short-term Investments, Fair Value	$ 902	$ 1,814

Short-term Investments - Schedule of Cost Basis and Fair Value of Short-term Investments by Contractual Maturity (Details) - Short-term Investments - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
One year or less, amortized cost	$ 38,365	$ 44,806
Over one year and less than two years, amortized cost	5,025	4,416
Short-term Investments, Amortized Cost	43,390	49,222
One year or less, fair value	38,347	44,794
Over one year and less than two years, fair value	5,023	4,417
Short-term Investments, Fair Value	$ 43,370	$ 49,211

Short-term Investments - Schedule of Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	$ 37,597	$ 42,011
Investments, Unrealized Losses	(22)	(22)
Corporate Debt Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	20,269	18,436
Investments, Unrealized Losses	(11)	(20)
U.S. Government Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	12,683	17,798
Investments, Unrealized Losses	(7)	(2)
U.S. Agency Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	3,743	$ 5,777
Investments, Unrealized Losses	(3)
Asset-backed Securities
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Investments, Fair Value	902
Investments, Unrealized Losses	$ (1)

Balance Sheet Components - Components of Inventories (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Inventory Disclosure [Abstract]
Finished goods	$ 5,809	$ 4,847
Raw material	1,022	983
Total inventory	$ 6,831	$ 5,830

Balance Sheet Components - Components of Deferred Revenue (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 16,067	$ 16,030
Less: current portion of deferred revenue	15,585	15,521
Deferred revenue, noncurrent portion included in other liabilities	482	509
Subscription and Services
Deferred Revenue Arrangement [Line Items]
Deferred revenue	14,429	13,770
Product and Other
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 1,638	$ 2,260

- Definition

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

+ References + Details

- Definition

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

+ References + Details

Balance Sheet Components - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Payables And Accruals [Abstract]
Accrued regulatory fees and taxes	$ 5,185	$ 4,315
Accrued payroll and related expenses	3,857	4,546
Other accrued expenses	2,408	2,718
Total accrued expenses	$ 11,450	$ 11,579

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Operating Leased Assets [Line Items]
Rent expense	$ 0.4	$ 0.6	$ 0.8	$ 1.1
Non-cancelable purchase commitments	2.8		$ 2.8
Palo Alto and Newark Facility
Operating Leased Assets [Line Items]
Operating lease expiration date			2020-11
Operating leases outstanding	$ 0.6		$ 0.6

Stockholders' Equity - Additional Information (Details)	1 Months Ended	3 Months Ended				6 Months Ended
Stockholders' Equity - Additional Information (Details)	Jun. 30, 2015 shares	Jul. 31, 2017 USD ($) $ / shares shares	Apr. 30, 2017 shares	Jul. 31, 2016 USD ($)	Apr. 30, 2016 shares	Jul. 31, 2017 USD ($) Peroid $ / shares shares	Jul. 31, 2016 USD ($) shares	Jul. 31, 2015 shares
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $		$ 3,120,000		$ 2,399,000		$ 6,091,000	$ 4,873,000
Common Stock Warrants
Stockholders Equity Note Disclosure [Line Items]
Number of common warrants exercised						38,315
Common stock issued upon exercise of warrants		19,144				19,144
Number of warrants outstanding		0				0
Stock Options
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $		$ 598,000		630,000		$ 1,190,000	1,314,000
Aggregate intrinsic value of options exercised \| $		29,000		600,000		$ 100,000	1,000,000
Weighted-average grant date fair value of options granted \| $ / shares						$ 4.81
Restricted Stock Units (RSUs)
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation \| $		$ 2,214,000		1,512,000		$ 4,320,000	$ 3,020,000
Shares of common stock repurchased for tax withholdings on vesting of RSUs						56,750	0
Payment for shares of common stock withheld for tax withholdings on vesting of RSUs \| $						$ 503,000	$ 0
ESPP
Stockholders Equity Note Disclosure [Line Items]
Increase in number of shares of common stock issued under the plan			360,974		341,793
Maximum shares of common stock initially authorized for future issuance								441,165
Percentage of eligible compensation subject to plan limitation		15.00%				15.00%
Employee stock purchase plan offering period						24 months
Number of purchase periods \| Peroid						4
Purchase periods						6 months
Purchase price of common stock as percentage of fair market value						85.00%
Number of shares of common stock issued under ESPP						150,633
Weighted average purchase price of shares of common stock under ESPP \| $ / shares		$ 5.34				$ 5.34
Stock-based compensation \| $		$ 308,000		$ 257,000		$ 581,000	$ 539,000
2015 Equity Incentive Plan
Stockholders Equity Note Disclosure [Line Items]
Maximum aggregate number of shares issued under the plan	6,638,930
Percentage of common stock outstanding	5.00%
Increase in number of shares of common stock issued under the plan			902,436		854,483
Common stock available for future issuance		780,068				780,068

Stockholders' Equity - Summarizes of Stock Option Activities (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Number of Shares Underlying Outstanding Options
Number of Shares Underlying Outstanding Options, Beginning balance	1,777,365
Number of Shares Underlying Outstanding Options, Options granted	119,250
Number of Shares Underlying Outstanding Options, Options exercised	(20,637)
Number of Shares Underlying Outstanding Options, Options canceled	(4,270)
Number of Shares Underlying Outstanding Options, Ending balance	1,871,708	1,777,365
Number of Shares Underlying Outstanding Options, Vested and exercisable	1,309,266
Number of Shares Underlying Outstanding Options, Vested and expected to vest	1,871,708
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance	$ 5.74
Weighted Average Exercise Price, Options granted	10.20
Weighted Average Exercise Price, Options exercised	4.04
Weighted Average Exercise Price, Options canceled	6.55
Weighted Average Exercise Price, Ending balance	6.04	$ 5.74
Weighted Average Exercise Price, Vested and exercisable	5.07
Weighted Average Exercise Price, Vested and expected to vest	$ 6.04
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term	6 years 8 months 12 days	7 years
Weighted Average Remaining Contractual Term, Vested and exercisable	6 years 2 months 12 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	6 years 8 months 12 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 5,748	$ 7,864
Aggregate Intrinsic Value, Vested and exercisable	4,958
Aggregate Intrinsic Value, Vested and expected to vest	$ 5,748

Stockholders' Equity - Summarizes of Restricted Stock Units Activities (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Number of Shares
Number of Shares, RSUs Beginning Balance	1,859,196
Number of Shares, RSUs granted	1,051,605
Number of Shares, RSUs vested	(309,165)
Number of Shares, RSUs canceled	(68,602)
Number of Shares, RSUs Ending Balance	2,533,034	1,859,196
Weighted-Average Grant-Date Fair Value Per Share
Weighted-Average Grant-Date Fair Value Per Share, Beginning Balance	$ 7.65
Weighted-Average Grant-Date Fair Value Per Share, RSUs granted	10.02
Weighted-Average Grant-Date Fair Value Per Share, RSUs vested	7.33
Weighted-Average Grant-Date Fair Value Per Share, RSUs canceled	8.38
Weighted-Average Grant-Date Fair Value Per Share, Ending Balance	$ 8.65	$ 7.65
Weighted-Average Remaining Contractual Life
Weighted-Average Remaining Contractual Life	1 year 4 months 24 days	1 year 4 months 24 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 21,022	$ 17,941

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, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 3,120	$ 2,399	$ 6,091	$ 4,873
Total cost of revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	343	243	658	478
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	496	355	1,016	681
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,148	863	2,216	1,807
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,133	$ 938	$ 2,201	$ 1,907

Stock-Based Compensation - Stock-Based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 3,120	$ 2,399	$ 6,091	$ 4,873
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	598	630	1,190	1,314
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	2,214	1,512	4,320	3,020
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 308	$ 257	$ 581	$ 539

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	31,750	31,750	50,720
Number of shares underlying outstanding options, options granted		119,250
Common stock, shares, Issued	11,491	23,520
Accrued expenses and other long-term liabilities	$ 0.1	$ 0.1		$ 0.1
Common stock options early exercised prior to vesting	0	0
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to unvested stock option grants	$ 2.5	$ 2.5
Stock-based compensation expenses recognized on straight line basis offering period		1 year 9 months 18 days
Number of shares underlying outstanding options, options granted			0
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to unvested stock option grants	$ 18.1	$ 18.1
Stock-based compensation expenses recognized on straight line basis offering period		3 years
Non employee stock options outstanding	2,533,034	2,533,034		1,859,196
Restricted Stock Units (RSUs) \| Non Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	71,960	71,960	85,250
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to unvested stock option grants	$ 0.6	$ 0.6
Stock-based compensation expenses recognized on straight line basis offering period		9 months 18 days

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Options Grants Using Black-Scholes Option Pricing Model (Details) - Stock Options	3 Months Ended	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	47.00%	47.00%
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days
Risk-free interest rate	2.10%	2.10%

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Purchase Plan Using Black-Scholes Option Pricing Model (Details) - ESPP	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility, minimum	35.00%	44.00%	35.00%	44.00%
Risk-free interest rate, minimum	0.90%	0.50%	0.90%	0.50%
Expected volatility, maximum	41.00%	50.00%	41.00%	50.00%
Risk-free interest rate, maximum	1.30%	1.00%	1.30%	1.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	6 months	6 months	6 months
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years	2 years	2 years	2 years

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Provision or benefit for income taxes	$ 0	$ 0	$ 0	$ 0
Unrecognized tax benefits	$ 2,100,000		2,100,000
Interest expense or penalties related to unrecognized tax benefits			$ 0

Basic and Diluted Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Numerator
Net loss	$ (3,623)	$ (3,340)	$ (7,015)	$ (7,296)
Denominator
Weighted-average common shares for basic and diluted net loss per share	18,360,560	17,280,985	18,246,457	17,180,671
Basic and diluted net loss per share	$ (0.20)	$ (0.19)	$ (0.38)	$ (0.42)

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, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	4,746,897	4,705,017	4,746,897	4,705,017
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	311,854	304,400	311,854	304,400
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	1,871,708	1,869,783	1,871,708	1,869,783
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	2,533,034	2,353,850	2,533,034	2,353,850
Common stock subject to repurchase
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share	30,301	79,053	30,301	79,053
Warrants to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares excluded from diluted net loss per share		97,931		97,931

Defined Contribution Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Compensation costs	$ 0.1	$ 0.1	$ 0.2	$ 0.2

Related Party Transaction - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
One of Board Members
Related Party Transaction [Line Items]
Public relations services fee	$ 0.1	$ 0.1	$ 0.1	$ 0.2

Subsequent Event - Additional Information (Details) - Subsequent Event - Business Promoter - Xedia Networks, Inc.	Aug. 15, 2017 USD ($)
Subsequent Event [Line Items]
Proceeds from disposition of business	$ 0
Quarterly earnout payment receivable, maximum	$ 4,500,000
Quarterly earnout payment receivable period	5 years