Nimble Storage (NMBL) 10-Q 9 Dec 16 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares shares in Millions	9 Months Ended
	Oct. 31, 2016	Nov. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2016
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
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		87.5

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 180,739	$ 211,160
Restricted cash, current	0	793
Accounts receivable, net of allowance for doubtful accounts of $19 as of October 31, 2016 and $25 as of January 31, 2016	59,257	50,432
Inventories	20,394	15,994
Prepaid expenses and other current assets	7,840	5,212
Total current assets	268,230	283,591
Property and equipment, net	52,924	47,404
Intangible asset, net	1,111	0
Other long-term assets	735	754
Total assets	323,000	331,749
Current liabilities:
Accounts payable	34,153	24,330
Accrued compensation and benefits	19,635	19,325
Deferred revenue, current portion	65,635	54,580
Other current liabilities	11,650	8,933
Total current liabilities	131,073	107,168
Deferred revenue, non-current portion	68,093	60,265
Other long-term liabilities	7,427	8,708
Total liabilities	206,593	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 October 31, 2016 and January 31, 2016	0	0
Common stock, par value of $0.001 per share; 750,000 shares authorized as of October 31, 2016 and January 31, 2016; 87,512 and 82,120 shares issued and outstanding as of October 31, 2016 and January 31, 2016, respectively	78	75
Additional paid-in capital	559,156	476,271
Accumulated other comprehensive loss	(916)	(731)
Accumulated deficit	(441,911)	(320,007)
Total stockholders' equity	116,407	155,608
Total liabilities and stockholders' equity	$ 323,000	$ 331,749

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 19	$ 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	87,512,000	82,120,000
Common stock, shares outstanding	87,512,000	82,120,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Revenue:
Product	$ 81,300	$ 65,574	$ 227,300	$ 192,519
Support and service	20,741	15,153	58,269	39,605
Total revenue	102,041	80,727	285,569	232,124
Cost of revenue:
Product	28,175	21,372	77,781	61,640
Support and service	8,810	6,665	25,170	18,954
Total cost of revenue	36,985	28,037	102,951	80,594
Gross profit	65,056	52,690	182,618	151,530
Operating expenses:
Research and development	28,738	22,936	84,478	69,184
Sales and marketing	64,944	49,853	187,066	142,156
General and administrative	10,373	8,249	31,607	26,959
Total operating expenses	104,055	81,038	303,151	238,299
Loss from operations	(38,999)	(28,348)	(120,533)	(86,769)
Interest income, net	76	66	196	195
Other expense, net	(36)	(41)	(599)	(344)
Loss before provision for income taxes	(38,959)	(28,323)	(120,936)	(86,918)
Provision for income taxes	313	251	968	751
Net loss	$ (39,272)	$ (28,574)	$ (121,904)	$ (87,669)
Net loss per share, basic and diluted	$ (0.45)	$ (0.36)	$ (1.44)	$ (1.12)
Weighted-average shares used to compute net loss per share, basic and diluted	86,342	79,736	84,667	78,137

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (39,272)	$ (28,574)	$ (121,904)	$ (87,669)
Other comprehensive loss, net of taxes:
Change in cumulative translation adjustment	(221)	(33)	(185)	(152)
Comprehensive loss	$ (39,493)	$ (28,607)	$ (122,089)	$ (87,821)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Cash flows from operating activities:
Net loss	$ (121,904)	$ (87,669)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	16,475	10,985
Stock-based compensation expense	70,009	60,836
Loss on disposal of property and equipment	90	160
Provision (recoveries) for allowance for doubtful accounts	(3)	81
Provision for excess and obsolete inventories	409	80
Changes in operating assets and liabilities:
Accounts receivable	(8,822)	(9,328)
Inventories	(6,654)	(2,580)
Prepaid expenses and other assets	(2,855)	(1,055)
Short term restricted cash	793	0
Accounts payable	8,972	6,124
Deferred revenue	18,883	31,003
Accrued and other liabilities	930	(5,172)
Net cash provided by (used in) operating activities	(23,677)	3,465
Cash flows from investing activities:
Purchase of property and equipment	(18,467)	(23,031)
Purchase of intangible asset	(938)	0
Change in restricted cash	(6)	5
Net cash used in investing activities	(19,411)	(23,026)
Cash flows from financing activities:
Proceeds from exercise of stock options, net of repurchases	2,725	6,488
Proceeds from issuance of stock under employee stock purchase plan	10,131	14,321
Excess tax benefit from employee stock plans	0	226
Net cash provided by financing activities	12,856	21,035
Foreign exchange impact on cash and cash equivalents	(189)	(156)
Net increase (decrease) in cash and cash equivalents	(30,421)	1,318
Cash and cash equivalents, beginning of period	211,160	208,394
Cash and cash equivalents, end of period	180,739	209,712
Supplemental disclosure of cash flow information:
Cash paid for income taxes	499	452
Cash paid for interest	33	25
Supplemental disclosure of noncash investing and financing activities:
Purchase of property and equipment not yet paid	5,136	4,139
Transfers of evaluation units from inventory to property and equipment	1,921	401
Vesting of early exercised stock options	495	1,027
Purchase of intangible assets not yet paid	$ 312	$ 0

Description of Business and Bas

Description of Business and Basis of Presentation	9 Months Ended
	Oct. 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 nine months ended October 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	9 Months Ended
	Oct. 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 nine months ended October 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 Nine Months Ended October 31, October 31, 2016 January 31, 2016 2016 2015 Customer A 25 % 41 % 34 % 40 % Customer B 35 % 26 % 31 % 21 % Customer C 14 % * 15 % 17 % * 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 October 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 August 2016, the Financial Accounting Standards Board, or FASB, released an Accounting Standard Update, or ASU, related to the classification of certain cash receipts and cash payments on the statement of cash flows. This standard is effective for the Company for its first quarter of fiscal 2019, although early adoption is permitted. The Company is currently evaluating the impact of this standard on its consolidated financial statements and related disclosures. In March 2016, the FASB released an 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	9 Months Ended
	Oct. 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 October 31, 2016 2015 Unvested restricted stock units 13,666 8,192 Shares subject to options to purchase common stock 7,474 9,493 Employee stock purchase plan 489 151 Unvested early exercised common shares 49 284

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Oct. 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. The Company enters 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 October 31, 2016 and January 31, 2016 are as follows (in thousands): As of October 31, 2016 As of January 31, 2016 Nominal Fair Value Nominal Fair Value Forward Contracts: Purchased $ — $ — $ — $ — Sold $ 10,025 $ (18 ) $ 14,535 $ 58

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Oct. 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 $8.6 million and $5.6 million as of October 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 October 31, January 31, Raw materials $ 1,873 $ 2,296 Finished goods 12,041 9,005 Evaluation inventory 6,480 4,693 $ 20,394 $ 15,994 Property and Equipment Property and equipment, net consisted of the following (in thousands): As of October 31, January 31, Computer equipment $ 15,851 $ 14,012 Lab equipment 38,987 28,734 Software 7,834 5,470 Furniture and fixtures 5,612 4,497 Leasehold improvements 18,279 17,514 Construction in progress 7,849 3,692 Demonstration equipment 3,719 2,287 Total property and equipment 98,131 76,206 Less: accumulated depreciation (45,207 ) (28,802 ) Total property and equipment, net $ 52,924 $ 47,404 Depreciation expense related to property and equipment was $5.8 million and $4.0 million for the three months ended October 31, 2016 and 2015, respectively, and $16.3 million and $11.0 million for the nine months ended October 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 October 31, 2016, the net book value of this intangible asset was $1.1 million, which was net of $139,000 accumulated amortization. Amortization expense related to this intangible asset was $104,000 and $139,000 for the three and nine months ended October 31, 2016, respectively. As of October 31, 2016, estimated future amortization expenses related to this intangible asset were as follows (in thousands): Years ending January 31: 2017 (remaining three months) $ 104 2018 416 2019 417 2020 174 $ 1,111

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 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 $2.0 million and $1.6 million for the three months ended October 31, 2016 and 2015, respectively, and $5.9 million and $4.6 million for the nine months ended October 31, 2016 and 2015, respectively. Future minimum commitments under these operating leases as of October 31, 2016 were as follows (in thousands): Years ending January 31: 2017 (remaining three months) $ 2,234 2018 8,013 2019 6,977 2020 6,979 2021 7,149 Thereafter 6,545 $ 37,897 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 In re Nimble Sec. Lit. In re Nimble Sec. Lit. 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	9 Months Ended
	Oct. 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 October 31, Nine Months Ended October 31, 2016 2015 2016 2015 Cost of product revenue $ 704 $ 265 $ 2,047 $ 1,470 Cost of support and service revenue 1,598 1,026 4,551 3,487 Research and development 7,301 4,888 21,220 16,957 Sales and marketing 9,624 9,132 29,964 28,632 General and administrative 4,372 2,219 12,227 10,290 Total stock-based compensation expense $ 23,599 $ 17,530 $ 70,009 $ 60,836 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 Company recognized an expense of $0.8 million and a reduction of expense of $1.6 million in stock-based compensation related to these RSUs for the three months ended October 31, 2016 and 2015, respectively. The increase of expense as compared to the three months ended October 31, 2015 is a result of the reduction in the performance compared to the previous forecast for fiscal year 2016 performance-based RSU grants. The Company recognized $3.5 million and $5.5 million stock-based compensation related to these RSUs for the nine months ended October 31, 2016 and 2015, respectively. The reduction of expense is due to earlier grants becoming fully vested. 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 $0.3 million for the three and nine months ended October 31, 2016, respectively.

Income Taxes

Income Taxes	9 Months Ended
	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The Company’s provision for income taxes of $0.3 million and $1.0 million for the three and nine months ended October 31, 2016, respectively, consisted of current foreign taxes and current state taxes. The Company’s provision for income taxes of $0.3 million and $0.8 million for the three and nine months ended October 31, 2015, respectively, consisted of current foreign taxes and current state taxes.

Segments

Segments	9 Months Ended
	Oct. 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 October 31, Nine Months Ended October 31, 2016 2015 2016 2015 North America $ 78,630 $ 63,279 $ 222,109 $ 185,289 EMEA 13,278 12,021 38,153 31,473 APAC 10,133 5,427 25,307 15,362 Total revenue $ 102,041 $ 80,727 $ 285,569 $ 232,124 Long-lived assets located in the following countries and regions as of each period end were as follows (in thousands): As of October 31, 2016 January 31, 2016 North America $ 53,845 $ 47,277 Other 925 881 Total long-lived assets $ 54,770 $ 48,158

Line of Credit

Line of Credit	9 Months Ended
	Oct. 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 October 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 October 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 October 31, 2016, no amounts had been drawn against the credit facility.

Description of Business and B17

Description of Business and Basis of Presentation (Policies)	9 Months Ended
	Oct. 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 nine months ended October 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 Nine Months Ended October 31, October 31, 2016 January 31, 2016 2016 2015 Customer A 25 % 41 % 34 % 40 % Customer B 35 % 26 % 31 % 21 % Customer C 14 % * 15 % 17 % * 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 October 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 August 2016, the Financial Accounting Standards Board, or FASB, released an Accounting Standard Update, or ASU, related to the classification of certain cash receipts and cash payments on the statement of cash flows. This standard is effective for the Company for its first quarter of fiscal 2019, although early adoption is permitted. The Company is currently evaluating the impact of this standard on its consolidated financial statements and related disclosures. In March 2016, the FASB released an 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)	9 Months Ended
	Oct. 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 Nine Months Ended October 31, October 31, 2016 January 31, 2016 2016 2015 Customer A 25 % 41 % 34 % 40 % Customer B 35 % 26 % 31 % 21 % Customer C 14 % * 15 % 17 % * Represents less than 10%.

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Oct. 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 October 31, 2016 2015 Unvested restricted stock units 13,666 8,192 Shares subject to options to purchase common stock 7,474 9,493 Employee stock purchase plan 489 151 Unvested early exercised common shares 49 284

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Oct. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of Derivative Assets and Derivative Liabilities	The Company’s derivative assets and derivative liabilities as of October 31, 2016 and January 31, 2016 are as follows (in thousands): As of October 31, 2016 As of January 31, 2016 Nominal Fair Value Nominal Fair Value Forward Contracts: Purchased $ — $ — $ — $ — Sold $ 10,025 $ (18 ) $ 14,535 $ 58

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Oct. 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 October 31, January 31, Raw materials $ 1,873 $ 2,296 Finished goods 12,041 9,005 Evaluation inventory 6,480 4,693 $ 20,394 $ 15,994
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): As of October 31, January 31, Computer equipment $ 15,851 $ 14,012 Lab equipment 38,987 28,734 Software 7,834 5,470 Furniture and fixtures 5,612 4,497 Leasehold improvements 18,279 17,514 Construction in progress 7,849 3,692 Demonstration equipment 3,719 2,287 Total property and equipment 98,131 76,206 Less: accumulated depreciation (45,207 ) (28,802 ) Total property and equipment, net $ 52,924 $ 47,404
Estimated Future Amortization Expenses Related to Intangible Asset	As of October 31, 2016, estimated future amortization expenses related to this intangible asset were as follows (in thousands): Years ending January 31: 2017 (remaining three months) $ 104 2018 416 2019 417 2020 174 $ 1,111

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Oct. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Commitments Under Operating Leases	Future minimum commitments under these operating leases as of October 31, 2016 were as follows (in thousands): Years ending January 31: 2017 (remaining three months) $ 2,234 2018 8,013 2019 6,977 2020 6,979 2021 7,149 Thereafter 6,545 $ 37,897

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Oct. 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 October 31, Nine Months Ended October 31, 2016 2015 2016 2015 Cost of product revenue $ 704 $ 265 $ 2,047 $ 1,470 Cost of support and service revenue 1,598 1,026 4,551 3,487 Research and development 7,301 4,888 21,220 16,957 Sales and marketing 9,624 9,132 29,964 28,632 General and administrative 4,372 2,219 12,227 10,290 Total stock-based compensation expense $ 23,599 $ 17,530 $ 70,009 $ 60,836

Segments (Tables)

Segments (Tables)	9 Months Ended
	Oct. 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 October 31, Nine Months Ended October 31, 2016 2015 2016 2015 North America $ 78,630 $ 63,279 $ 222,109 $ 185,289 EMEA 13,278 12,021 38,153 31,473 APAC 10,133 5,427 25,307 15,362 Total revenue $ 102,041 $ 80,727 $ 285,569 $ 232,124
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 October 31, 2016 January 31, 2016 North America $ 53,845 $ 47,277 Other 925 881 Total long-lived assets $ 54,770 $ 48,158

Description of Business and B25

Description of Business and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Oct. 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	9 Months Ended
	Apr. 30, 2016	Oct. 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]	9 Months Ended		12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jan. 31, 2016
Accounts Receivable [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	35.00%		26.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	14.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	25.00%		41.00%
Sales Revenue, Net [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	31.00%	21.00%
Sales Revenue, Net [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	15.00%	17.00%
Sales Revenue, Net [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	34.00%	40.00%

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]	9 Months Ended	12 Months Ended
	Oct. 31, 2016	Jan. 31, 2016
Concentration Risk [Line Items]
Concentration risk, Percentage	14.00%
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	9 Months Ended
	Oct. 31, 2016	Oct. 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	13,666	8,192
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	7,474	9,493
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	489	151
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	49	284

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Derivative Assets and Derivative Liabilities (Detail) - Forward Contracts [Member] - USD ($)	Oct. 31, 2016	Jan. 31, 2016
Purchased [Member]
Derivative [Line Items]
Nominal Amount	$ 0	$ 0
Sold [Member]
Derivative [Line Items]
Nominal Amount	10,025,000	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)	$ (18,000)	$ 58,000

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Jan. 31, 2016
Balance Sheet Components [Line Items]
Service inventory held at service depots	$ 8,600,000			$ 8,600,000		$ 5,600,000
Depreciation expense related to property and equipment	5,800,000		$ 4,000,000	16,300,000	$ 11,000,000
Software purchased		$ 1,250,000
Net book value of intangible asset	1,111,000			1,111,000		$ 0
Amortization expense related to intangible asset	104,000			$ 139,000
Software Intangible Asset [Member]
Balance Sheet Components [Line Items]
Estimated useful life of intangible asset				3 years
Net book value of intangible asset	1,111,000			$ 1,111,000
Accumulated amortization of intangible asset	$ 139,000			$ 139,000

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	Oct. 31, 2016	Jan. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 1,873	$ 2,296
Finished goods	12,041	9,005
Evaluation inventory	6,480	4,693
Total	$ 20,394	$ 15,994

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 98,131	$ 76,206
Less: accumulated depreciation	(45,207)	(28,802)
Total property and equipment, net	52,924	47,404
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	15,851	14,012
Lab Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	38,987	28,734
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	7,834	5,470
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	5,612	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	7,849	3,692
Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 3,719	$ 2,287

Balance Sheet Components - Esti

Balance Sheet Components - Estimated Future Amortization Expenses Related to Intangible Asset (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Years ending January 31:
2017 (remaining three months)	$ 104
2,018	416
2,019	417
2,020	174
Net book value of intangible asset	$ 1,111	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2014USD ($)	Jul. 31, 2014USD ($)	Apr. 30, 2013USD ($)	Oct. 31, 2016USD ($)Claim	Oct. 31, 2015USD ($)	Oct. 31, 2016USD ($)Claim	Oct. 31, 2015USD ($)	Jan. 31, 2016USD ($)	Jan. 31, 2014USD ($)
Other Commitments [Line Items]
Rent expense				$ 2	$ 1.6	$ 5.9	$ 4.6
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 Contingencies36

Commitments and Contingencies - Future Minimum Commitments Under Operating Leases (Detail) $ in Thousands	Oct. 31, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017 (remaining three months)	$ 2,234
2,018	8,013
2,019	6,977
2,020	6,979
2,021	7,149
Thereafter	6,545
Future minimum commitments under operating leases	$ 37,897

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		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 23,599	$ 17,530	$ 70,009	$ 60,836
Cost of Product Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	704	265	2,047	1,470
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	1,598	1,026	4,551	3,487
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	7,301	4,888	21,220	16,957
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	9,624	9,132	29,964	28,632
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 4,372	$ 2,219	$ 12,227	$ 10,290

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 23,599	$ 17,530	$ 70,009	$ 60,836
Performance Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	800	$ (1,600)	3,500	$ 5,500
Market Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 100		$ 300

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 313	$ 251	$ 968	$ 751

Segments - Additional Informati

Segments - Additional Information (Detail)	9 Months Ended
	Oct. 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		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 102,041	$ 80,727	$ 285,569	$ 232,124
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	78,630	63,279	222,109	185,289
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	13,278	12,021	38,153	31,473
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 10,133	$ 5,427	$ 25,307	$ 15,362

Segments - Schedule of Long-liv

Segments - Schedule of Long-lived Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 54,770	$ 48,158
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	53,845	47,277
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 925	$ 881

Line of Credit - Additional Inf

Line of Credit - Additional Information (Detail) - USD ($)	1 Months Ended	9 Months Ended
	Feb. 29, 2016	Oct. 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.