Nimble Storage (NMBL) 10-Q 9 Sep 16 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares shares in Millions	6 Months Ended
	Jul. 31, 2016	Aug. 31, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2016
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	NMBL
Entity Registrant Name	Nimble Storage Inc
Entity Central Index Key	1,452,751
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		85.1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 194,218	$ 211,160
Restricted cash, current	488	793
Accounts receivable, net of allowance for doubtful accounts of $41 as of July 31, 2016 and $25 as of January 31, 2016	49,115	50,432
Inventories	18,129	15,994
Prepaid expenses and other current assets	7,440	5,212
Total current assets	269,390	283,591
Property and equipment, net	50,041	47,404
Intangible asset, net	1,215	0
Other long-term assets	898	754
Total assets	321,544	331,749
Current liabilities:
Accounts payable	28,711	24,330
Accrued compensation and benefits	20,943	19,325
Deferred revenue, current portion	62,018	54,580
Other current liabilities	10,333	8,933
Total current liabilities	122,005	107,168
Deferred revenue, non-current portion	65,036	60,265
Other long-term liabilities	7,885	8,708
Total liabilities	194,926	176,141
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, par value of $0.001 per share; 5,000 shares authorized, no shares issued and outstanding as of July 31, 2016 and January 31, 2016	0	0
Common stock, par value of $0.001 per share; 750,000 shares authorized as of July 31, 2016 and January 31, 2016; 84,919 and 82,120 shares issued and outstanding as of July 31, 2016 and January 31, 2016, respectively	77	75
Additional paid-in capital	529,875	476,271
Accumulated other comprehensive loss	(695)	(731)
Accumulated deficit	(402,639)	(320,007)
Total stockholders' equity	126,618	155,608
Total liabilities and stockholders' equity	$ 321,544	$ 331,749

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 41	$ 25
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	84,919,000	82,120,000
Common stock, shares outstanding	84,919,000	82,120,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Revenue:
Product	$ 77,615	$ 66,752	$ 146,000	$ 126,945
Support and service	19,496	13,357	37,528	24,452
Total revenue	97,111	80,109	183,528	151,397
Cost of revenue:
Product	25,815	21,127	49,606	40,268
Support and service	8,553	6,637	16,360	12,289
Total cost of revenue	34,368	27,764	65,966	52,557
Gross profit	62,743	52,345	117,562	98,840
Operating expenses:
Research and development	29,593	24,539	55,740	46,248
Sales and marketing	61,678	47,860	122,122	92,303
General and administrative	10,792	9,449	21,234	18,710
Total operating expenses	102,063	81,848	199,096	157,261
Loss from operations	(39,320)	(29,503)	(81,534)	(58,421)
Interest income, net	47	61	120	129
Other expense, net	(339)	(379)	(563)	(303)
Loss before provision for income taxes	(39,612)	(29,821)	(81,977)	(58,595)
Provision for income taxes	338	288	655	500
Net loss	$ (39,950)	$ (30,109)	$ (82,632)	$ (59,095)
Net loss per share, basic and diluted	$ (0.47)	$ (0.38)	$ (0.99)	$ (0.76)
Weighted-average shares used to compute net loss per share, basic and diluted	84,482	78,228	83,823	77,381

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (39,950)	$ (30,109)	$ (82,632)	$ (59,095)
Other comprehensive income (loss), net of taxes:
Change in cumulative translation adjustment	(457)	(113)	36	(119)
Comprehensive loss	$ (40,407)	$ (30,222)	$ (82,596)	$ (59,214)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Cash flows from operating activities:
Net loss	$ (82,632)	$ (59,095)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	10,578	6,938
Stock-based compensation expense	46,410	43,306
Loss on disposal of property and equipment	89	109
Provision for allowance for doubtful accounts	19	54
Allowance for inventory reserves	288	76
Changes in operating assets and liabilities:
Accounts receivable	1,298	(7,900)
Inventories	(4,002)	(1,639)
Prepaid expenses and other assets	(2,497)	58
Short term restricted cash	305	0
Accounts payable	1,770	3,308
Deferred revenue	12,209	23,458
Accrued and other liabilities	3,798	(2,104)
Net cash provided by (used in) operating activities	(12,367)	6,569
Cash flows from investing activities:
Purchase of property and equipment	(11,778)	(13,958)
Change in restricted cash	(6)	4
Net cash used in investing activities	(11,784)	(13,954)
Cash flows from financing activities:
Proceeds from exercise of stock options, net of repurchases	1,601	5,243
Proceeds from issuance of stock under employee stock purchase plan	5,568	7,201
Excess tax benefit from employee stock plans	0	226
Net cash provided by financing activities	7,169	12,670
Foreign exchange impact on cash and cash equivalents	40	(125)
Net increase (decrease) in cash and cash equivalents	(16,942)	5,160
Cash and cash equivalents, beginning of period	211,160	208,394
Cash and cash equivalents, end of period	194,218	213,554
Supplemental disclosure of cash flow information:
Cash paid for income taxes	349	207
Cash paid for interest	17	18
Supplemental disclosure of noncash investing and financing activities:
Purchase of property and equipment not yet paid	3,421	6,367
Transfers of evaluation units from inventory to property and equipment	1,813	381
Purchase of intangible assets not yet paid	1,250	0
Vesting of early exercised stock options	$ 362	$ 720

Description of Business and Bas

Description of Business and Basis of Presentation	6 Months Ended
	Jul. 31, 2016
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	1. Description of Business and Basis of Presentation Description of Business Nimble Storage, Inc., or the Company, was incorporated in the state of Delaware in November 2007. The Company’s enduring mission is to engineer and deliver the industry’s most efficient flash storage platform. The Company’s Predictive Flash platform is comprised of a Unified Flash Fabric that provides a single consolidation architecture with common data services across a portfolio of All Flash and Adaptive Flash arrays and InfoSight predictive analytics with integrated support and service offerings. The Company is headquartered in San Jose, California, with employees in several international locations, including the United Kingdom, Australia, Canada, Germany, and Singapore. Basis of Presentation and Consolidation The consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles, or U.S. GAAP, and include the consolidated accounts of the Company and its subsidiaries. Inter-company accounts and transactions have been eliminated in consolidation. These interim consolidated financial statements are unaudited but reflect, in the opinion of management, all adjustments, consisting of normal recurring adjustments and accruals, necessary to present fairly the financial position of the Company, the Consolidated Statements of Operations, the Consolidated Statements of Comprehensive Loss and the Consolidated Statements of Cash Flows. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with U.S. GAAP have been omitted pursuant to the Securities and Exchange Commission, or SEC, rules and regulations relating to interim financial statements. The accompanying consolidated financial statements should be read in conjunction with the Company’s audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K, or Annual Report, for the year ended January 31, 2016 filed with the SEC on March 31, 2016. The results of operations for the three and six months ended July 31, 2016 are not necessarily indicative of the results to be expected for the full fiscal year.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jul. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies There have been no material changes in the Company’s significant accounting policies for the three and six months ended July 31, 2016, as compared to the significant accounting policies described in the Company’s Annual Report for the fiscal year ended January 31, 2016. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Such estimates include, but are not limited to, the determination of the best estimated selling prices of deliverables included in multiple-deliverable revenue arrangements; the allowance for doubtful accounts; provision for excess or obsolete inventory; the useful lives of property and equipment and intangible asset; the determination of the best estimated achievement of financial performance metrics related to the Company’s performance-based stock awards, and the fair value of the Company’s market-based stock awards. Actual results could differ from these estimates. Concentrations The Company’s financial instruments that are exposed to concentrations of credit risk are primarily cash and cash equivalents and trade accounts receivable. Cash and cash equivalents are maintained primarily at one financial institution, and deposits may exceed the amount of insurance provided on such deposits. Risks associated with cash and cash equivalents are mitigated by banking with a creditworthy institution. The Company has not experienced any losses on its deposits of cash and cash equivalents. The Company performs ongoing credit evaluations of its end-customers’ financial condition whenever deemed necessary and generally does not require collateral. The Company’s policy is to maintain an allowance for doubtful accounts based upon the expected collectability of its accounts receivable, which takes into consideration specific end-customer creditworthiness and current economic trends. Of all the Company’s customers, which include direct end-customers and channel partners, including value added resellers, or VARs, and distributors, the following distributors individually accounted for more than 10% of the Company’s accounts receivable and revenue at the end of and for each period presented: % of Accounts Receivable % of Revenue As of Six Months Ended July 31, July 31, 2016 January 31, 2016 2016 2015 Customer A 32 % 41 % 37 % 41 % Customer B 34 % 26 % 30 % 20 % Customer C 10 % * 14 % 18 % * Represents less than 10%. There are no concentrations of business transacted with a particular market that would severely impact the Company’s business in the near term. However, the Company currently relies on one key contract manufacturer and supplier to produce most of its products; any disruption or termination of these arrangements could materially adversely affect the Company’s operating results. Warranties The Company provides a standard one-year warranty for hardware components covering material defects in materials and workmanship. In addition, the Company provides a 90-day warranty on the embedded software in its products for non-conformance with documented specifications. The Company accrues for estimated warranty costs based upon historical experience, and periodically assesses the adequacy of its recorded warranty liability at the end of each period. These costs are expensed as incurred and included in the cost of product revenue in the Company’s consolidated statements of operations. In addition, failed parts recovered from customers are submitted to the Company’s suppliers for repair or replacement. These cost recoveries are offset against the Company’s warranty costs. The Company records warranty liability in other current liabilities in its consolidated balance sheet. As of July 31, 2016, the Company’s warranty liability was not material. Stock-Based Compensation The Company estimates fair value for its stock-based awards, including employee and non-employee director stock options, and purchases under its employee stock purchase plan, or ESPP, using the Black-Scholes-Merton option-pricing model. The Black-Scholes-Merton option-pricing model requires the input of expected volatility of the price of the Company’s common stock. In prior periods, the expected volatility was based on the historical volatilities of the Company’s publicly traded peer group as the Company did not have a sufficient trading history for its common stock. In the first quarter of fiscal 2017, the Company had over two years of trading history for its common stock and call options. As a result, the Company determined the expected volatility based on a combination of its historical volatility of its common stock price and implied volatility of its call options. Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board, or FASB, released an Accounting Standard Update, or ASU, related to how stock-based payments are accounted for and presented in the financial statements, including income taxes, forfeitures and statutory tax withholding requirements. This standard is effective for the Company for its first quarter of fiscal 2018, although early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements and related disclosures. In February 2016, the FASB released an ASU that requires the recognition of lease assets and lease liabilities by lessees for operating leases. The standard is effective for the Company for its first quarter of fiscal 2020, although early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements and related disclosures. In November 2015, the FASB released an ASU, Balance Sheet Classification of Deferred Taxes In July 2015, the FASB issued amendments to simplify the measurement of inventory. Under the amendments, inventory will be measured at the “lower of cost and net realizable value” and options that currently exist for “market value” will be eliminated. The guidance defines net realizable value as the “estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation.” No other changes were made to the current guidance on inventory measurement. The amendments are effective for the Company for its first quarter of fiscal 2018, although early adoption is permitted. The Company is currently evaluating the effect of the updated standard on its consolidated financial statements and related disclosures. In May 2014, the FASB released an ASU, Revenue from Contracts with Customers Revenue Recognition Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net) Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedient

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jul. 31, 2016
Earnings Per Share [Abstract]
Net Loss Per Share	3. Net Loss Per Share The following potentially dilutive securities were excluded (as common stock equivalents) from the computation of diluted net loss per share for the periods presented as their effect would have been antidilutive (in thousands): As of July 31, 2016 2015 Unvested restricted stock units 13,535 7,823 Shares subject to options to purchase common stock 7,905 10,033 Employee stock purchase plan 717 341 Unvested early exercised common shares 81 411

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jul. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	4. Fair Value Measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, to measure the fair value: • Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. • Level 3—Inputs are unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation. Beginning in November 2014, the Company entered into foreign currency forward contracts to minimize the short-term impact of foreign currency exchange rate fluctuations on cash and certain trade and inter-company receivables and payables. These are not designated hedge instruments. These instruments are marked to market through earnings every period and generally have an original maturity period of one month. These instruments are classified within level 2 of the fair value hierarchy. The Company’s derivative assets and derivative liabilities as of July 31, 2016 and January 31, 2016 are as follows (in thousands): As of July 31, 2016 As of January 31, 2016 Nominal Fair Value Nominal Fair Value Forward Contracts: Purchased $ — $ — $ — $ — Sold $ 11,602 $ (111 ) $ 14,535 $ 58

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jul. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	5. Balance Sheet Components Inventory Inventories consist primarily of raw materials related to component parts, finished goods, which include both inventory held for sale and service inventory held at service depots in support of end-customer service agreements, and end-customer evaluation inventory. Service inventory held at service depots was $6.8 million and $5.6 million as of July 31, 2016 and January 31, 2016, respectively. The following is a summary of the Company’s inventories, net of inventory provisions recorded to adjust inventory to its estimated realizable value, by major category (in thousands): As of July 31, January 31, Raw materials $ 2,715 $ 2,296 Finished goods 9,325 9,005 Evaluation inventory 6,089 4,693 $ 18,129 $ 15,994 Property and Equipment Property and equipment, net consisted of the following (in thousands): As of July 31, January 31, Computer equipment $ 15,840 $ 14,012 Lab equipment 36,730 28,734 Software 7,085 5,470 Furniture and fixtures 4,995 4,497 Leasehold improvements 18,279 17,514 Construction in progress 3,640 3,692 Demonstration equipment 3,054 2,287 Total property and equipment 89,623 76,206 Less: accumulated depreciation (39,582 ) (28,802 ) Total property and equipment, net $ 50,041 $ 47,404 Depreciation expense related to property and equipment was $5.4 million and $3.6 million for the three months ended July 31, 2016 and 2015, respectively, and $10.5 million and $6.9 million for the six months ended July 31, 2016 and 2015, respectively. Intangible Asset Intangible asset is stated at cost, net of accumulated amortization. During the three months ended July 31, 2016, the Company purchased the intellectual property rights of software to be used internally for $1.25 million. The Company estimated the useful life of this intangible asset to be three years. As of July 31, 2016, the net book value of this intangible asset was $1.22 million, which was net of $35,000 accumulated amortization.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	6. Commitments and Contingencies Leases The Company leases its facilities under various noncancelable operating leases with fixed rental payments. Rent expense totaled $1.9 million and $1.5 million for the three months ended July 31, 2016 and 2015, respectively, and $3.9 million and $3.0 million for the six months ended July 31, 2016 and 2015, respectively. Future minimum commitments under these operating leases as of July 31, 2016 were as follows (in thousands): Years ending January 31: 2017 (remaining six months) $ 4,240 2018 7,501 2019 6,977 2020 6,979 2021 7,149 Thereafter 6,545 $ 39,391 In July 2014, the Company entered into a facility lease agreement for its North Carolina office. The 84-month lease commenced on August 1, 2014. Total rent, including common area maintenance expense and fixed operating expense, payable over the lease period is $5.0 million. As part of the lease agreement, the Company received an allowance of $1.4 million for tenant improvement during the year ended January 31, 2016. This allowance was included in the calculation of rent expense and related deferred rent balances. In December 2014, the Company amended the lease agreement for its North Carolina office giving the Company access to additional space on February 1, 2016 through the same term as the original facility lease. As part of the lease amendment, the Company will receive an additional allowance of $1.0 million for tenant improvement. In April 2013, the Company entered into a facility lease agreement for its headquarters in San Jose, California. The 96-month lease commenced on November 1, 2013. Total rent, including operating expenses, payable over the lease period is $35.5 million. As part of the lease agreement, the Company received an allowance of $4.9 million for tenant improvement during the year ended January 31, 2014. This allowance was included in the calculation of rent expense and related deferred rent balances. As a condition of the lease agreement, the Company is required to maintain a letter of credit of $3.9 million, with the landlord named as the beneficiary. The Company has the option to extend the term of the lease for an additional period of 60 months. Contingencies From time to time, the Company is party to litigation and subject to claims that arise in the ordinary course of business, including actions with respect to employment claims and other matters. Although the results of litigation and claims are inherently unpredictable, the Company believes that the final outcome of such matters will not have a material adverse effect on the business, consolidated financial position, results of operations or cash flows. On December 17, 2015, a purported securities class action entitled Vikramkumar v. Nimble Storage, Inc., et al. Guardino v. Nimble Storage, Inc., et al. Madhani v. Nimble Storage, Inc In re Nimble Storage, Inc. Securities Litigation In re Nimble Sec. Lit In re Nimble Sec. Lit. On February 23, 2016, a purported shareholder derivative action entitled Schwartz v. Vasudevan, et al. Schwartz Schwartz In re Nimble Sec. Lit. In re Nimble Sec. Lit. Goldstein v. Vasudevan, et al. Goldstein Schwartz Schwartz Goldstein In re Nimble Storage, Inc. Derivative Litigation In re Nimble Deriv. Lit. In re Nimble Sec. Lit. In re Nimble Sec. Lit. On May 19, 2016, a purported shareholder derivative action entitled Chua v. Vasudevan, et al. Chua Schwartz Goldstein Chua Indemnification Some of the Company’s sales contracts require the Company to indemnify its end-customers against third-party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments entered on such claims. The Company’s exposure under these indemnification provisions is generally limited to the total amount paid by the end-customer under the contract. However, certain contracts include indemnification provisions that could potentially expose the Company to losses in excess of the amount received under the contract. In addition, the Company indemnifies its officers, directors, and certain key employees while they are serving in good faith in their respective capacities. To date, there have been no claims under any indemnification provisions.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jul. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	7. Stock-Based Compensation The following table summarizes the components of stock-based compensation expense related to stock options, restricted stock units, or RSUs, and the ESPP (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2015 2016 2015 Cost of product revenue $ 728 $ 660 $ 1,343 $ 1,205 Cost of support and service revenue 1,568 1,304 2,953 2,461 Research and development 7,773 6,638 13,919 12,069 Sales and marketing 9,727 9,389 20,340 19,500 General and administrative 4,067 4,330 7,855 8,071 Total stock-based compensation expense $ 23,863 $ 22,321 $ 46,410 $ 43,306 The Company grants RSUs to certain employees based on the Company meeting certain performance thresholds. The estimated probability of the number of these RSUs expected to vest is assessed for each reporting period until the total shares granted are determined. The stock-based compensation expense related to these RSUs totaled $1.2 million and $4.1 million for the three months ended July 31, 2016 and 2015, respectively, and $2.7 million and $7.2 million for the six months ended July 31, 2016 and 2015, respectively. The reduction of expense related to these RSUs in the three and six months ended July 31, 2016 is due to a reduction in the performance achieved in fiscal year 2016 as compared to the previously forecasted fiscal year 2016 performance as of the three and six months ended July 31, 2015. Beginning in March 2016, the Company granted RSUs to certain employees, contingent on the achievement of the Company’s comparative market-based returns which is based on the Company’s stock price compared against a market index. The fair value of these market-based RSUs is estimated using the Monte Carlo option-price model on the date of grant as the RSUs contain both service and market conditions. The stock-based compensation expense related to these RSUs was $0.1 million and $0.2 million for the three and six months ended July 31, 2016, respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The Company’s provision for income taxes of $0.3 million and $0.7 million for the three and six months ended July 31, 2016, respectively, consisted of current foreign taxes and current state taxes. The Company’s provision for income taxes of $0.3 million and $0.5 million for the three and six months ended July 31, 2015, respectively, consisted of current foreign taxes and current state taxes.

Segments

Segments	6 Months Ended
	Jul. 31, 2016
Segment Reporting [Abstract]
Segments	9. Segments The Company’s chief operating decision maker is its chief executive officer. The chief executive officer reviews consolidated financial information accompanied by information about revenue by product line for purposes of allocating resources and evaluating financial performance. The Company has one business activity and there are no segment managers who are held accountable for operations, or operating results for levels or components. In addition, the majority of the Company’s operations and end-customers are located in the United States. As such, the Company has a single reporting segment and a single operating unit structure. Revenue by region, based on the bill to mailing address of the end-customer, for the periods presented was as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2015 2016 2015 North America $ 74,298 $ 64,107 $ 143,479 $ 122,010 EMEA 13,109 10,201 24,875 19,452 APAC 9,704 5,801 15,174 9,935 Total revenue $ 97,111 $ 80,109 $ 183,528 $ 151,397 Long-lived assets located in the following countries and regions as of each period end were as follows (in thousands): As of July 31, 2016 January 31, 2016 North America $ 51,289 $ 47,277 Other 865 881 Total long-lived assets $ 52,154 $ 48,158

Line of Credit

Line of Credit	6 Months Ended
	Jul. 31, 2016
Debt Disclosure [Abstract]
Line of Credit	10. Line of Credit In February 2016, there was a $0.5 million reduction of the available line of credit related to a letter of credit issued as collateral to secure various business operating activities. As of July 31, 2016, the remaining credit facility available for borrowings was $9.5 million. In July 2016, the Company extended the term of the credit facility, which now expires in August 2018. Under this renewal, amounts outstanding under the credit facility bear interest at 2.25% above LIBOR with accrued interest payable on a monthly basis. In addition, the Company is obligated to pay a commitment fee of 0.20% per annum on the unused portion of the credit facility, with such fee payable on a quarterly basis. As of July 31, 2016, the commitment fee was capitalized and being amortized on the Company’s consolidated balance sheet. Under this renewal, the Company granted Wells Fargo a first priority lien in its accounts receivable and other corporate assets, agreed to not pledge its intellectual property to other parties and became subject to certain reporting and financial covenants, as follows: (i) maintain minimum tangible net worth, defined as the aggregate of total stockholders’ equity plus subordinated debt less any intangible assets and less any loans or advances to, or investments in, any related entities or individuals, of $65 million; and (ii) maintain a monthly ratio of not less than 1.25 to 1.00, based on the aggregate of its cash and net accounts receivable divided by total current liabilities minus current deferred revenue. As of July 31, 2016, no amounts had been drawn against the credit facility.

Description of Business and B17

Description of Business and Basis of Presentation (Policies)	6 Months Ended
	Jul. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles, or U.S. GAAP, and include the consolidated accounts of the Company and its subsidiaries. Inter-company accounts and transactions have been eliminated in consolidation. These interim consolidated financial statements are unaudited but reflect, in the opinion of management, all adjustments, consisting of normal recurring adjustments and accruals, necessary to present fairly the financial position of the Company, the Consolidated Statements of Operations, the Consolidated Statements of Comprehensive Loss and the Consolidated Statements of Cash Flows. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with U.S. GAAP have been omitted pursuant to the Securities and Exchange Commission, or SEC, rules and regulations relating to interim financial statements. The accompanying consolidated financial statements should be read in conjunction with the Company’s audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K, or Annual Report, for the year ended January 31, 2016 filed with the SEC on March 31, 2016. The results of operations for the three and six months ended July 31, 2016 are not necessarily indicative of the results to be expected for the full fiscal year.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Such estimates include, but are not limited to, the determination of the best estimated selling prices of deliverables included in multiple-deliverable revenue arrangements; the allowance for doubtful accounts; provision for excess or obsolete inventory; the useful lives of property and equipment and intangible asset; the determination of the best estimated achievement of financial performance metrics related to the Company’s performance-based stock awards, and the fair value of the Company’s market-based stock awards. Actual results could differ from these estimates.
Concentrations	Concentrations The Company’s financial instruments that are exposed to concentrations of credit risk are primarily cash and cash equivalents and trade accounts receivable. Cash and cash equivalents are maintained primarily at one financial institution, and deposits may exceed the amount of insurance provided on such deposits. Risks associated with cash and cash equivalents are mitigated by banking with a creditworthy institution. The Company has not experienced any losses on its deposits of cash and cash equivalents. The Company performs ongoing credit evaluations of its end-customers’ financial condition whenever deemed necessary and generally does not require collateral. The Company’s policy is to maintain an allowance for doubtful accounts based upon the expected collectability of its accounts receivable, which takes into consideration specific end-customer creditworthiness and current economic trends. Of all the Company’s customers, which include direct end-customers and channel partners, including value added resellers, or VARs, and distributors, the following distributors individually accounted for more than 10% of the Company’s accounts receivable and revenue at the end of and for each period presented: % of Accounts Receivable % of Revenue As of Six Months Ended July 31, July 31, 2016 January 31, 2016 2016 2015 Customer A 32 % 41 % 37 % 41 % Customer B 34 % 26 % 30 % 20 % Customer C 10 % * 14 % 18 % * Represents less than 10%. There are no concentrations of business transacted with a particular market that would severely impact the Company’s business in the near term. However, the Company currently relies on one key contract manufacturer and supplier to produce most of its products; any disruption or termination of these arrangements could materially adversely affect the Company’s operating results.
Warranties	Warranties The Company provides a standard one-year warranty for hardware components covering material defects in materials and workmanship. In addition, the Company provides a 90-day warranty on the embedded software in its products for non-conformance with documented specifications. The Company accrues for estimated warranty costs based upon historical experience, and periodically assesses the adequacy of its recorded warranty liability at the end of each period. These costs are expensed as incurred and included in the cost of product revenue in the Company’s consolidated statements of operations. In addition, failed parts recovered from customers are submitted to the Company’s suppliers for repair or replacement. These cost recoveries are offset against the Company’s warranty costs. The Company records warranty liability in other current liabilities in its consolidated balance sheet. As of July 31, 2016, the Company’s warranty liability was not material.
Stock-Based Compensation	Stock-Based Compensation The Company estimates fair value for its stock-based awards, including employee and non-employee director stock options, and purchases under its employee stock purchase plan, or ESPP, using the Black-Scholes-Merton option-pricing model. The Black-Scholes-Merton option-pricing model requires the input of expected volatility of the price of the Company’s common stock. In prior periods, the expected volatility was based on the historical volatilities of the Company’s publicly traded peer group as the Company did not have a sufficient trading history for its common stock. In the first quarter of fiscal 2017, the Company had over two years of trading history for its common stock and call options. As a result, the Company determined the expected volatility based on a combination of its historical volatility of its common stock price and implied volatility of its call options.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board, or FASB, released an Accounting Standard Update, or ASU, related to how stock-based payments are accounted for and presented in the financial statements, including income taxes, forfeitures and statutory tax withholding requirements. This standard is effective for the Company for its first quarter of fiscal 2018, although early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements and related disclosures. In February 2016, the FASB released an ASU that requires the recognition of lease assets and lease liabilities by lessees for operating leases. The standard is effective for the Company for its first quarter of fiscal 2020, although early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements and related disclosures. In November 2015, the FASB released an ASU, Balance Sheet Classification of Deferred Taxes In July 2015, the FASB issued amendments to simplify the measurement of inventory. Under the amendments, inventory will be measured at the “lower of cost and net realizable value” and options that currently exist for “market value” will be eliminated. The guidance defines net realizable value as the “estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation.” No other changes were made to the current guidance on inventory measurement. The amendments are effective for the Company for its first quarter of fiscal 2018, although early adoption is permitted. The Company is currently evaluating the effect of the updated standard on its consolidated financial statements and related disclosures. In May 2014, the FASB released an ASU, Revenue from Contracts with Customers Revenue Recognition Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net) Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedient
Fair Value Measurements	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, to measure the fair value: • Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. • Level 3—Inputs are unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation.
Inventory	Inventory Inventories consist primarily of raw materials related to component parts, finished goods, which include both inventory held for sale and service inventory held at service depots in support of end-customer service agreements, and end-customer evaluation inventory.
Commitments and Contingencies	From time to time, the Company is party to litigation and subject to claims that arise in the ordinary course of business, including actions with respect to employment claims and other matters. Although the results of litigation and claims are inherently unpredictable, the Company believes that the final outcome of such matters will not have a material adverse effect on the business, consolidated financial position, results of operations or cash flows.
Segment Reporting	The Company’s chief operating decision maker is its chief executive officer. The chief executive officer reviews consolidated financial information accompanied by information about revenue by product line for purposes of allocating resources and evaluating financial performance. The Company has one business activity and there are no segment managers who are held accountable for operations, or operating results for levels or components. In addition, the majority of the Company’s operations and end-customers are located in the United States. As such, the Company has a single reporting segment and a single operating unit structure.

Summary of Significant Accoun18

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jul. 31, 2016
Accounting Policies [Abstract]
Percentage of Company's Accounts Receivable and Revenue	Of all the Company’s customers, which include direct end-customers and channel partners, including value added resellers, or VARs, and distributors, the following distributors individually accounted for more than 10% of the Company’s accounts receivable and revenue at the end of and for each period presented: % of Accounts Receivable % of Revenue As of Six Months Ended July 31, July 31, 2016 January 31, 2016 2016 2015 Customer A 32 % 41 % 37 % 41 % Customer B 34 % 26 % 30 % 20 % Customer C 10 % * 14 % 18 % * Represents less than 10%.

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jul. 31, 2016
Earnings Per Share [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share	The following potentially dilutive securities were excluded (as common stock equivalents) from the computation of diluted net loss per share for the periods presented as their effect would have been antidilutive (in thousands): As of July 31, 2016 2015 Unvested restricted stock units 13,535 7,823 Shares subject to options to purchase common stock 7,905 10,033 Employee stock purchase plan 717 341 Unvested early exercised common shares 81 411

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of Derivative Assets and Derivative Liabilities	The Company’s derivative assets and derivative liabilities as of July 31, 2016 and January 31, 2016 are as follows (in thousands): As of July 31, 2016 As of January 31, 2016 Nominal Fair Value Nominal Fair Value Forward Contracts: Purchased $ — $ — $ — $ — Sold $ 11,602 $ (111 ) $ 14,535 $ 58

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jul. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Company's Inventories, Net of Inventory Provisions Recorded to Adjust Inventory to Estimated Realizable Value by Major Category	The following is a summary of the Company’s inventories, net of inventory provisions recorded to adjust inventory to its estimated realizable value, by major category (in thousands): As of July 31, January 31, Raw materials $ 2,715 $ 2,296 Finished goods 9,325 9,005 Evaluation inventory 6,089 4,693 $ 18,129 $ 15,994
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): As of July 31, January 31, Computer equipment $ 15,840 $ 14,012 Lab equipment 36,730 28,734 Software 7,085 5,470 Furniture and fixtures 4,995 4,497 Leasehold improvements 18,279 17,514 Construction in progress 3,640 3,692 Demonstration equipment 3,054 2,287 Total property and equipment 89,623 76,206 Less: accumulated depreciation (39,582 ) (28,802 ) Total property and equipment, net $ 50,041 $ 47,404

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Commitments Under Operating Leases	Future minimum commitments under these operating leases as of July 31, 2016 were as follows (in thousands): Years ending January 31: 2017 (remaining six months) $ 4,240 2018 7,501 2019 6,977 2020 6,979 2021 7,149 Thereafter 6,545 $ 39,391

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jul. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Components of Stock-based Compensation Expense Related to Stock Options, Restricted Stock Units, or RSUs, and ESPP	The following table summarizes the components of stock-based compensation expense related to stock options, restricted stock units, or RSUs, and the ESPP (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2015 2016 2015 Cost of product revenue $ 728 $ 660 $ 1,343 $ 1,205 Cost of support and service revenue 1,568 1,304 2,953 2,461 Research and development 7,773 6,638 13,919 12,069 Sales and marketing 9,727 9,389 20,340 19,500 General and administrative 4,067 4,330 7,855 8,071 Total stock-based compensation expense $ 23,863 $ 22,321 $ 46,410 $ 43,306

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jul. 31, 2016
Segment Reporting [Abstract]
Schedule of Revenue by Region	Revenue by region, based on the bill to mailing address of the end-customer, for the periods presented was as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2015 2016 2015 North America $ 74,298 $ 64,107 $ 143,479 $ 122,010 EMEA 13,109 10,201 24,875 19,452 APAC 9,704 5,801 15,174 9,935 Total revenue $ 97,111 $ 80,109 $ 183,528 $ 151,397
Schedule of Long-lived Assets	Long-lived assets located in the following countries and regions as of each period end were as follows (in thousands): As of July 31, 2016 January 31, 2016 North America $ 51,289 $ 47,277 Other 865 881 Total long-lived assets $ 52,154 $ 48,158

Description of Business and B25

Description of Business and Basis of Presentation - Additional Information (Detail)	6 Months Ended
	Jul. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business entity, date of incorporation	2007-11
Business entity state of incorporation	State of Delaware

Summary of Significant Accoun26

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Apr. 30, 2016	Jul. 31, 2016
Summary of Significant Accounting Policies [Line Items]
Years of common stock and call options trading history	2 years
Minimum [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, Percentage		10.00%
Minimum [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, Percentage		10.00%
Hardware [Member]
Summary of Significant Accounting Policies [Line Items]
Standard product warranty period		1 year
Embedded Software [Member]
Summary of Significant Accounting Policies [Line Items]
Standard product warranty period		90 days

Summary of Significant Accoun27

Summary of Significant Accounting Policies - Percentage of Company's Accounts Receivable and Revenue (Detail) - Customer Concentration Risk [Member]	6 Months Ended		12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2016
Accounts Receivable [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	34.00%		26.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	10.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	32.00%		41.00%
Sales Revenue, Net [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	30.00%	20.00%
Sales Revenue, Net [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	14.00%	18.00%
Sales Revenue, Net [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	37.00%	41.00%

Summary of Significant Accoun28

Summary of Significant Accounting Policies - Percentage of Company's Accounts Receivable and Revenue (Parenthetical) (Detail) - Accounts Receivable [Member] - Customer Concentration Risk [Member] - Customer C [Member]	6 Months Ended	12 Months Ended
	Jul. 31, 2016	Jan. 31, 2016
Concentration Risk [Line Items]
Concentration risk, Percentage	10.00%
Maximum [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage		10.00%

Net Loss Per Share - Schedule o

Net Loss Per Share - Schedule of Antidilutive Securities Excluded from Computation of Diluted Net loss Per Share (Detail) - shares shares in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Unvested Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net loss per share	13,535	7,823
Employee Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net loss per share	7,905	10,033
Employee Stock Purchase Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net loss per share	717	341
Unvested Early Exercised Common Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net loss per share	81	411

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Derivative Assets and Derivative Liabilities (Detail) - Forward Contracts [Member] - USD ($)	Jul. 31, 2016	Jan. 31, 2016
Purchased [Member]
Derivative [Line Items]
Nominal Amount	$ 0	$ 0
Sold [Member]
Derivative [Line Items]
Nominal Amount	11,602,000	14,535,000
Level 2 [Member] | Purchased [Member]
Derivative [Line Items]
Fair Value Gain (Loss)	0	0
Level 2 [Member] | Sold [Member]
Derivative [Line Items]
Fair Value Gain (Loss)	$ (111,000)	$ 58,000

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2016
Balance Sheet Components [Line Items]
Service inventory held at service depots	$ 6,800,000		$ 6,800,000		$ 5,600,000
Depreciation expense related to property and equipment	5,400,000	$ 3,600,000	10,500,000	$ 6,900,000
Software purchased	1,250,000
Net book value of intangible asset	1,215,000		$ 1,215,000		$ 0
Software [Member]
Balance Sheet Components [Line Items]
Estimated useful life of intangible asset			3 years
Net book value of intangible asset	1,220,000		$ 1,220,000
Accumulated amortization of intangible asset	$ 35,000		$ 35,000

Balance Sheet Components - Summ

Balance Sheet Components - Summary of Company's Inventories, Net of Inventory Provisions Recorded to Adjust Inventory to Estimated Realizable Value by Major Category (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 2,715	$ 2,296
Finished goods	9,325	9,005
Evaluation inventory	6,089	4,693
Total	$ 18,129	$ 15,994

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 89,623	$ 76,206
Less: accumulated depreciation	(39,582)	(28,802)
Total property and equipment, net	50,041	47,404
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	15,840	14,012
Lab Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	36,730	28,734
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	7,085	5,470
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	4,995	4,497
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	18,279	17,514
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,640	3,692
Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 3,054	$ 2,287

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2014USD ($)	Jul. 31, 2014USD ($)	Apr. 30, 2013USD ($)	Jul. 31, 2016USD ($)Claim	Jul. 31, 2015USD ($)	Jul. 31, 2016USD ($)Claim	Jul. 31, 2015USD ($)	Jan. 31, 2016USD ($)	Jan. 31, 2014USD ($)
Other Commitments [Line Items]
Rent expense				$ 1.9	$ 1.5	$ 3.9	$ 3
Number of claims pending | Claim				3		3
San Jose, California Office [Member]
Other Commitments [Line Items]
Contractual obligation			$ 35.5
Tenant improvement allowances received									$ (4.9)
Operating lease collateral in the form of a letter of credit			$ 3.9
Lease term optional extension period			60 months
Term of operating lease			96 months
Lease commencement date			Nov. 1, 2013
North Carolina Office [Member]
Other Commitments [Line Items]
Contractual obligation		$ 5
Tenant improvement allowances received								$ (1.4)
Tenant improvement allowances receivable	$ 1
Term of operating lease		84 months
Lease commencement date	Feb. 1, 2016	Aug. 1, 2014

Commitments and Contingencies35

Commitments and Contingencies - Future Minimum Commitments Under Operating Leases (Detail) $ in Thousands	Jul. 31, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017 (remaining six months)	$ 4,240
2,018	7,501
2,019	6,977
2,020	6,979
2,021	7,149
Thereafter	6,545
Future minimum commitments under operating leases	$ 39,391

Stock-Based Compensation - Comp

Stock-Based Compensation - Components of Stock-based Compensation Expense Related to Stock Options, Restricted Stock Units, or RSUs, and ESPP (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 23,863	$ 22,321	$ 46,410	$ 43,306
Cost of Product Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	728	660	1,343	1,205
Cost of Support and Service Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	1,568	1,304	2,953	2,461
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	7,773	6,638	13,919	12,069
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	9,727	9,389	20,340	19,500
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 4,067	$ 4,330	$ 7,855	$ 8,071

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 23,863	$ 22,321	$ 46,410	$ 43,306
Performance Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1,200	$ 4,100	2,700	$ 7,200
Market Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 100		$ 200

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 338	$ 288	$ 655	$ 500

Segments - Additional Informati

Segments - Additional Information (Detail)	6 Months Ended
	Jul. 31, 2016SegmentUnit
Segment Reporting [Abstract]
Number of business activity	1
Number of reporting segments	1
Number of operating unit | Unit	1

Segments - Schedule of Revenue

Segments - Schedule of Revenue by Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 97,111	$ 80,109	$ 183,528	$ 151,397
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	74,298	64,107	143,479	122,010
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	13,109	10,201	24,875	19,452
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 9,704	$ 5,801	$ 15,174	$ 9,935

Segments - Schedule of Long-liv

Segments - Schedule of Long-lived Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 52,154	$ 48,158
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	51,289	47,277
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 865	$ 881

Line of Credit - Additional Inf

Line of Credit - Additional Information (Detail) - USD ($)	1 Months Ended	6 Months Ended
	Feb. 29, 2016	Jul. 31, 2016
Line of Credit Facility [Line Items]
Remaining credit facility available for borrowings		$ 9,500,000
Reduction of available line related to Letter of Credit issued	$ (500,000)
Line of credit facility unused portion commitment fee		0.20%
Line of credit facility expiration date		2018-08
Minimum tangible net worth limit		$ 65,000,000
Minimum current ratio		125.00%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Variable rate above LIBOR		2.25%
Wells Fargo Bank, National Association [Member]
Line of Credit Facility [Line Items]
Line of credit facility financial covenants		(i) maintain minimum tangible net worth, defined as the aggregate of total stockholders' equity plus subordinated debt less any intangible assets and less any loans or advances to, or investments in, any related entities or individuals, of $65 million; and (ii) maintain a monthly ratio of not less than 1.25 to 1.00, based on the aggregate of its cash and net accounts receivable divided by total current liabilities minus current deferred revenue.