Nimble Storage (NMBL) 10-Q 9 Sep 15 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares shares in Millions	6 Months Ended
	Jul. 31, 2015	Aug. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2015
Document Fiscal Year Focus	2,016
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	Accelerated Filer
Entity Common Stock, Shares Outstanding		79.5

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 213,554	$ 208,394
Accounts receivable, net of allowance for doubtful accounts of $55 as of July 31, 2015 and $0 as of January 31, 2015	43,117	35,271
Inventories	13,717	11,981
Prepaid expenses and other current assets	4,908	4,974
Total current assets	275,296	260,620
Property and equipment, net	43,596	36,716
Restricted cash, non-current	3,979	3,983
Other long-term assets	263	255
Total assets	323,134	301,574
Current liabilities:
Accounts payable	23,364	19,799
Accrued compensation and benefits	18,356	21,128
Deferred revenue, current portion	46,387	34,246
Other current liabilities	8,388	8,063
Total current liabilities	96,495	83,236
Deferred revenue, non-current portion	51,517	40,200
Other long-term liabilities	9,126	9,566
Total liabilities	$ 157,138	$ 133,002
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, 2015 and January 31, 2015	$ 0	$ 0
Common stock, par value of $0.001 per share; 750,000 shares authorized as of July 31, 2015 and January 31, 2015; 79,368 and 76,191 shares issued and outstanding as of July 31, 2015 and January 31, 2015, respectively	74	71
Additional paid-in capital	425,325	368,689
Accumulated other comprehensive loss	(370)	(250)
Accumulated deficit	(259,033)	(199,938)
Total stockholders' equity	165,996	168,572
Total liabilities and stockholders' equity	$ 323,134	$ 301,574

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 55	$ 0
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	79,368,000	76,191,000
Common stock, shares outstanding	79,368,000	76,191,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Revenue:
Product	$ 66,752	$ 47,123	$ 126,945	$ 88,358
Support and service	13,357	6,638	24,452	11,950
Total revenue	80,109	53,761	151,397	100,308
Cost of revenue:
Product	21,127	14,797	40,268	27,808
Support and service	6,637	3,719	12,289	7,043
Total cost of revenue	27,764	18,516	52,557	34,851
Gross profit	52,345	35,245	98,840	65,457
Operating expenses:
Research and development	24,539	17,417	46,248	31,634
Sales and marketing	47,860	36,639	92,303	65,841
General and administrative	9,449	7,101	18,710	13,538
Total operating expenses	81,848	61,157	157,261	111,013
Loss from operations	(29,503)	(25,912)	(58,421)	(45,556)
Interest income, net	61	22	129	18
Other income (expense), net	(379)	(65)	(303)	144
Loss before provision for income taxes	(29,821)	(25,955)	(58,595)	(45,394)
Provision for income taxes	288	162	500	318
Net loss	$ (30,109)	$ (26,117)	$ (59,095)	$ (45,712)
Net loss per share, basic and diluted	$ (0.38)	$ (0.37)	$ (0.76)	$ (0.65)
Weighted-average shares used to compute net loss per share, basic and diluted	78,228	71,381	77,381	70,854

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (30,109)	$ (26,117)	$ (59,095)	$ (45,712)
Other comprehensive income (loss), net of taxes:
Change in cumulative translation adjustment	(113)	46	(119)	117
Comprehensive loss	$ (30,222)	$ (26,071)	$ (59,214)	$ (45,595)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Cash flows from operating activities:
Net loss	$ (59,095)	$ (45,712)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	6,938	3,828
Stock-based compensation expense	43,306	24,726
Loss on disposal of property and equipment	109	0
Provision (recoveries) for allowance for doubtful accounts	54	(32)
Provision (recoveries) for excess and obsolete inventories	76	(167)
Changes in operating assets and liabilities:
Accounts receivable	(7,900)	(11,912)
Inventories	(1,639)	(3,690)
Prepaid expenses and other assets	58	163
Accounts payable	3,308	7,648
Deferred revenue	23,458	16,966
Accrued and other liabilities	(2,104)	11,471
Net cash provided by operating activities	6,569	3,289
Cash flows from investing activities:
Purchase of property and equipment	(13,958)	(7,907)
Change in restricted cash	4	(98)
Net cash used in investing activities	(13,954)	(8,005)
Cash flows from financing activities:
Payment of issuance costs related to issuance of common stock	0	(1,210)
Proceeds from exercise of stock options, net of repurchases	5,243	3,241
Proceeds from issuance of stock under employee stock purchase plan	7,201	0
Excess tax benefit from employee stock plans	226	0
Payment of taxes related to net settlement of restricted stock units	0	(125)
Net cash provided by financing activities	12,670	1,906
Foreign exchange impact on cash and cash equivalents	(125)	117
Net increase (decrease) in cash and cash equivalents	5,160	(2,693)
Cash and cash equivalents, beginning of period	208,394	208,486
Cash and cash equivalents, end of period	213,554	205,793
Supplemental disclosure of cash flow information:
Cash paid for income taxes	207	251
Cash paid for interest	18	0
Supplemental disclosure of noncash investing and financing activities:
Vesting of early exercised stock options	720	1,378
Purchase of property and equipment not yet paid	$ 6,367	$ 1,912

Description of Business and Bas

Description of Business and Basis of Presentation	6 Months Ended
	Jul. 31, 2015
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	1. Description of Business and Basis of Presentation Description of Business Nimble Storage, Inc. (the “Company”) was incorporated in the state of Delaware in November 2007. The Company’s mission is to provide its customers with the industry’s most efficient data storage platform. The Company has designed and sells a flash-optimized storage platform, Adaptive Flash, that it believes is disrupting the market by enabling significant improvements in application performance and storage capacity with superior data protection, while simplifying business operations and lowering costs. With the combination of the Company’s file system, CASL, and its cloud-based storage management and support service, InfoSight, the Company’s Adaptive Flash platform serves a broad array of enterprises and cloud-based service providers, and the Company’s software and storage systems effectively handle mainstream applications, including virtual desktops, databases, email, collaboration and analytics. 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 (“U.S. GAAP”) and include the consolidated accounts of the Company and its subsidiaries. Intercompany 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 condensed or omitted pursuant to the Securities and Exchange Commission’s (the “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 (the “Annual Report”) for the year ended January 31, 2015 filed with the SEC on April 2, 2015. The results of operations for the three and six months ended July 31, 2015 are not necessarily indicative of the results to be expected for the full year.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jul. 31, 2015
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, 2015, as compared to the significant accounting policies described in its Annual Report for the fiscal year ended January 31, 2015. 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; the warranty reserve; and the fair value of the Company’s common stock and stock options issued. 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 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 customer creditworthiness and current economic trends. During the third and fourth quarters of the year ended January 31, 2014, the Company consolidated the majority of its North American sales to three distributors, and as a result, accounts receivable and revenue increased in concentration. The majority of previous value added resellers (“VARs”) are now purchasing from our distributors. Of all the Company’s customers, which include direct end-customers, VARs and distributors, the following customers 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, 2015 January 31, 2015 2015 2014 Customer A 36 % 44 % 41 % 54 % Customer B 20 % 18 % 20 % * Customer C 21 % 16 % 18 % 22 % Customer D 10 % * * * * 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 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, 2015, the Company’s warranty liability was not material. Recent Accounting Pronouncements In April 2015, the Financial Accounting Standards Board (“FASB”) issued new authoritative guidance on fees paid in a cloud computing arrangement. The standard requires customers in a cloud computing arrangement to evaluate whether the arrangement includes a software license. If the arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If the arrangement does not include a software license, the customer should account for the arrangement as a service contract. The standard is effective for the Company for its first quarter of fiscal 2017, although early adoption is permitted, and will be applied on either a prospective or retrospective basis. The Company is currently evaluating adoption methods and whether this standard will have a material impact on our consolidated financial statements. In May 2014, the FASB released Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers Revenue Recognition

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jul. 31, 2015
Earnings Per Share [Abstract]
Net Loss Per Share	3. Net Loss Per Share The following table sets forth the computation of net loss per share (in thousands, except per share amounts): Three Months Ended Six Months Ended 2015 2014 2015 2014 Numerator: Net loss $ (30,109 ) $ (26,117 ) $ (59,095 ) $ (45,712 ) Denominator: Weighted-average number of shares outstanding - basic and diluted 78,228 71,381 77,381 70,854 Net loss per share, basic and diluted $ (0.38 ) $ (0.37 ) $ (0.76 ) $ (0.65 ) 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, 2015 2014 Shares subject to options to purchase common stock 10,033 14,675 Unvested restricted stock units 7,823 3,556 Unvested early exercised common shares 411 1,097 Employee stock purchase plan 341 387

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jul. 31, 2015
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 our own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation. 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 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 fair value of foreign exchange forward contracts outstanding was a loss of $71,000 and $59,000 as of July 31, 2015 and January 31, 2015, respectively. The Company’s derivative assets and derivative liabilities as of July 31, 2015 and January 31, 2015 are as follows (in thousands): As of July 31, 2015 As of January 31, 2015 Nominal Fair Value Nominal Fair Value Forward Contracts: Purchased $ — $ — $ — $ — Sold $ 11,632 $ (71 ) $ 17,324 $ (59 )

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jul. 31, 2015
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 customer service agreements, and customer evaluation inventory. Service inventory held at service depots was $5.0 million and $4.1 million as of July 31, 2015 and January 31, 2015, respectively. In addition, inventory reserves were $3.2 million and $2.3 million as of July 31, 2015 and January 31, 2015, 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, 2015 2015 Raw materials $ 2,513 $ 2,383 Finished goods 7,095 6,871 Evaluation inventory 4,109 2,727 $ 13,717 $ 11,981 Property and Equipment Property and equipment, net consisted of the following (in thousands): As of July 31, January 31, 2015 2015 Computer equipment $ 11,032 $ 9,226 Lab equipment 23,920 17,768 Software 3,886 3,443 Furniture and fixtures 3,486 3,287 Leasehold improvements 14,493 14,461 Construction in progress 5,416 1,223 Demonstration equipment 1,806 1,256 Total property and equipment 64,039 50,664 Less: accumulated depreciation (20,443 ) (13,948 ) Total property and equipment, net $ 43,596 $ 36,716 Costs incurred in connection with the development of the Company’s software are accounted for as follows: all costs incurred in the preliminary project and post-implementation stages are expensed as incurred. Certain costs incurred in the application development stage of a new product or projects are capitalized if certain criteria are met. Such costs are depreciated on a straight-line basis over the estimated useful lives of the related assets, which was estimated to be three years. Maintenance and training costs are typically expensed as incurred. Depreciation expense related to property and equipment was $3.6 million and $2.1 million for the three months ended July 31, 2015 and 2014, respectively, and $6.9 million and $3.8 million for the six months ended July 31, 2015 and 2014, respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2015
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 $1.5 million and $1.3 million for the three months ended July 31, 2015 and 2014, respectively, and $3.0 million and $2.5 million for the six months ended July 31, 2015 and 2014, respectively. Future minimum commitments under these operating leases as of July 31, 2015 were as follows (in thousands): Years ending January 31: 2016 (remaining six months) $ 3,456 2017 6,932 2018 6,864 2019 6,683 2020 6,598 Thereafter 12,354 $ 42,887 In July 2014, the Company entered into a new facility lease agreement for its North Carolina office. The 84-month lease commenced on August 1, 2014 and provides 47,986 square feet of space. 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 will receive an allowance of $1.4 million for tenant improvements. 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 an additional 38,909 square feet of space on February 1, 2016 through the same term as the original facility lease. In April 2013, the Company entered into a facility lease agreement with a 96-month lease term that commenced on November 1, 2013 and provides 164,608 square feet of space in San Jose, California. Total rent, including operating expenses, payable over the lease period is $35.5 million. As part of the lease agreement, the Company received $4.9 million in tenant improvement allowance during the year ended January 31, 2014. This tenant improvement 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 October 29, 2013, NetApp, Inc. (“NetApp”), filed a lawsuit in United States District Court, Northern District of California, alleging violations of the federal Computer Fraud and Abuse Act (“CFAA”), trade secret misappropriation, unfair competition and related state law claims. The Company and three individuals, a sales engineer employee of an Australian affiliate, along with a sales representative and program manager of the Company, had been named as defendants. On January 10, 2014, NetApp filed a First Amended Complaint that added similar state law claims against three additional individuals as defendants. The First Amended Complaint alleged that the Australian defendant, a former employee of a NetApp reseller, accessed NetApp’s password-protected website allegedly restricted to NetApp partners, resellers, employees and customers, and downloaded confidential and proprietary information in violation of the CFAA. It further alleged that the other five individual defendants, who were formerly employed at NetApp, downloaded NetApp company documents and materials, including allegedly confidential and trade secret information and/or deleted NetApp documents and materials, prior to leaving NetApp. On May 16, 2014, NetApp filed a lawsuit in the Superior Court of California, County of Santa Clara against the Company and five individuals who were dismissed from the federal lawsuit, alleging claims that were similar to those dismissed from the federal lawsuit. The state court complaint sought unspecified damages and injunctive relief. The parties entered into a written settlement agreement effective March 16, 2015, the terms of which are confidential. The settlement, which is not material to the Company’s consolidated financial statements, resolved all remaining claims in the two pending litigations. Both matters involving NetApp have been dismissed with prejudice. On July 15, 2015, NetApp filed a motion to modify the settlement agreement to allow NetApp additional time to comply. The Company opposed that motion and at a hearing on August 25, 2015, the Court took the motion under submission. On August 3, 2015, NetApp filed a motion alleging the Company and codefendants had not fully complied with the terms of the confidential settlement agreement. The Company opposed that motion and at a hearing on September 2, 2015, the Court denied the motion in its entirety. Indemnification Some of the Company’s sales contracts require the Company to indemnify its 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 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, 2015
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 (“RSUs”) and the employee stock purchase plan (“ESPP”) (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Cost of product revenue $ 660 $ 374 $ 1,205 $ 605 Cost of support and service revenue 1,304 593 2,461 986 Research and development 6,638 3,692 12,069 6,132 Sales and marketing 9,389 8,664 19,500 13,585 General and administrative 4,330 1,846 8,071 3,418 Total stock-based compensation expense $ 22,321 $ 15,169 $ 43,306 $ 24,726 The Company grants RSUs to certain employees, which is based on the Company meeting certain performance thresholds. The estimated probability of the amount of shares expected to vest was assessed for each reporting period until the total shares granted are determined. For the three and six months ended July 31, 2015, the Company recognized $4.1 million and $7.2 million stock-based compensation related to these RSUs, respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The Company’s provision for income taxes of $288,000 and $500,000 for the three and six months ended July 31, 2015 consisted of current foreign taxes and current state taxes, respectively. The Company’s provision for income taxes of $162,000 and $318,000 for the three and six months ended July 31, 2014 consisted of current foreign taxes and current state taxes, respectively.

Segments

Segments	6 Months Ended
	Jul. 31, 2015
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 customers are located in the United States. As such, the Company has a single reporting segment and operating unit structure. Revenue by country or region, based on the mailing address of the customer, for the periods presented was as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2015 2014 2015 2014 North America $ 64,107 $ 45,726 $ 122,010 $ 83,826 EMEA 10,201 5,693 19,452 11,744 APAC 5,801 2,336 9,935 4,726 Other — 6 — 12 Total revenue $ 80,109 $ 53,761 $ 151,397 $ 100,308 Long-lived assets located in the following countries and regions as of each period end were as follows (in thousands): As of July 31, 2015 January 31, 2015 North America $ 47,333 $ 40,521 Other 505 433 Total long-lived assets $ 47,838 $ 40,954

Line of Credit

Line of Credit	6 Months Ended
	Jul. 31, 2015
Debt Disclosure [Abstract]
Line of Credit	10. Line of Credit In October 2013, the Company entered into an agreement with Wells Fargo Bank, National Association (“Wells Fargo”) to provide a secured revolving credit facility (the “Credit Facility”) that allows the Company to borrow up to $15.0 million for general corporate purposes. There was a $0.9 million reduction of the available line related to the Letter of Credit issued in July 2014 for the Company’s new facility lease in North Carolina. In April 2015, the Company increased its Letter of Credit from $0.9 million to $1.1 million, with the landlord named as the beneficiary. As of July 31, 2015, the remaining Credit Facility available for borrowings was $13.0 million. Amounts outstanding under the Credit Facility will bear interest at Wells Fargo’s prime rate 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, 2015, the commitment fee was capitalized and being amortized on the Company’s consolidated balance sheet. The Credit Facility was renewed in September 2014 for an incremental two-year period and now expires in October 2016. Under the credit facility renewal, the Company granted to 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: (1) 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 $135 million; and (2) 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, 2015, 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, 2015
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 (“U.S. GAAP”) and include the consolidated accounts of the Company and its subsidiaries. Intercompany 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 condensed or omitted pursuant to the Securities and Exchange Commission’s (the “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 (the “Annual Report”) for the year ended January 31, 2015 filed with the SEC on April 2, 2015. The results of operations for the three and six months ended July 31, 2015 are not necessarily indicative of the results to be expected for the full 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; the warranty reserve; and the fair value of the Company’s common stock and stock options issued. 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 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 customer creditworthiness and current economic trends. During the third and fourth quarters of the year ended January 31, 2014, the Company consolidated the majority of its North American sales to three distributors, and as a result, accounts receivable and revenue increased in concentration. The majority of previous value added resellers (“VARs”) are now purchasing from our distributors. Of all the Company’s customers, which include direct end-customers, VARs and distributors, the following customers 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, 2015 January 31, 2015 2015 2014 Customer A 36 % 44 % 41 % 54 % Customer B 20 % 18 % 20 % * Customer C 21 % 16 % 18 % 22 % Customer D 10 % * * * * 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 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, 2015, the Company’s warranty liability was not material.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In April 2015, the Financial Accounting Standards Board (“FASB”) issued new authoritative guidance on fees paid in a cloud computing arrangement. The standard requires customers in a cloud computing arrangement to evaluate whether the arrangement includes a software license. If the arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If the arrangement does not include a software license, the customer should account for the arrangement as a service contract. The standard is effective for the Company for its first quarter of fiscal 2017, although early adoption is permitted, and will be applied on either a prospective or retrospective basis. The Company is currently evaluating adoption methods and whether this standard will have a material impact on our consolidated financial statements. In May 2014, the FASB released Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers Revenue Recognition
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 our 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 customer service agreements, and customer evaluation inventory.
Research, Development, and Computer Software	Costs incurred in connection with the development of the Company’s software are accounted for as follows: all costs incurred in the preliminary project and post-implementation stages are expensed as incurred. Certain costs incurred in the application development stage of a new product or projects are capitalized if certain criteria are met. Such costs are depreciated on a straight-line basis over the estimated useful lives of the related assets, which was estimated to be three years. Maintenance and training costs are typically expensed as incurred.
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 customers are located in the United States. As such, the Company has a single reporting segment and operating unit structure.

Summary of Significant Accoun18

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jul. 31, 2015
Accounting Policies [Abstract]
Percentage of Company's Accounts Receivable and Revenue	Of all the Company’s customers, which include direct end-customers, VARs and distributors, the following customers 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, 2015 January 31, 2015 2015 2014 Customer A 36 % 44 % 41 % 54 % Customer B 20 % 18 % 20 % * Customer C 21 % 16 % 18 % 22 % Customer D 10 % * * * * Represents less than 10%.

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jul. 31, 2015
Earnings Per Share [Abstract]
Computation of Net Loss Per Share	The following table sets forth the computation of net loss per share (in thousands, except per share amounts): Three Months Ended Six Months Ended 2015 2014 2015 2014 Numerator: Net loss $ (30,109 ) $ (26,117 ) $ (59,095 ) $ (45,712 ) Denominator: Weighted-average number of shares outstanding - basic and diluted 78,228 71,381 77,381 70,854 Net loss per share, basic and diluted $ (0.38 ) $ (0.37 ) $ (0.76 ) $ (0.65 )
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, 2015 2014 Shares subject to options to purchase common stock 10,033 14,675 Unvested restricted stock units 7,823 3,556 Unvested early exercised common shares 411 1,097 Employee stock purchase plan 341 387

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Derivative Assets and Derivative Liabilities	The Company’s derivative assets and derivative liabilities as of July 31, 2015 and January 31, 2015 are as follows (in thousands): As of July 31, 2015 As of January 31, 2015 Nominal Fair Value Nominal Fair Value Forward Contracts: Purchased $ — $ — $ — $ — Sold $ 11,632 $ (71 ) $ 17,324 $ (59 )

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jul. 31, 2015
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, 2015 2015 Raw materials $ 2,513 $ 2,383 Finished goods 7,095 6,871 Evaluation inventory 4,109 2,727 $ 13,717 $ 11,981
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): As of July 31, January 31, 2015 2015 Computer equipment $ 11,032 $ 9,226 Lab equipment 23,920 17,768 Software 3,886 3,443 Furniture and fixtures 3,486 3,287 Leasehold improvements 14,493 14,461 Construction in progress 5,416 1,223 Demonstration equipment 1,806 1,256 Total property and equipment 64,039 50,664 Less: accumulated depreciation (20,443 ) (13,948 ) Total property and equipment, net $ 43,596 $ 36,716

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Commitments Under Operating Leases	Future minimum commitments under these operating leases as of July 31, 2015 were as follows (in thousands): Years ending January 31: 2016 (remaining six months) $ 3,456 2017 6,932 2018 6,864 2019 6,683 2020 6,598 Thereafter 12,354 $ 42,887

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jul. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Components of Stock-based Compensation Expense Related to Stock Options, Restricted Stock Units ("RSUs") and Employee Stock Purchase Plan ("ESPP")	The following table summarizes the components of stock-based compensation expense related to stock options, restricted stock units (“RSUs”) and the employee stock purchase plan (“ESPP”) (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Cost of product revenue $ 660 $ 374 $ 1,205 $ 605 Cost of support and service revenue 1,304 593 2,461 986 Research and development 6,638 3,692 12,069 6,132 Sales and marketing 9,389 8,664 19,500 13,585 General and administrative 4,330 1,846 8,071 3,418 Total stock-based compensation expense $ 22,321 $ 15,169 $ 43,306 $ 24,726

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jul. 31, 2015
Segment Reporting [Abstract]
Schedule of Revenue by Country or Region	Revenue by country or region, based on the mailing address of the customer, for the periods presented was as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2015 2014 2015 2014 North America $ 64,107 $ 45,726 $ 122,010 $ 83,826 EMEA 10,201 5,693 19,452 11,744 APAC 5,801 2,336 9,935 4,726 Other — 6 — 12 Total revenue $ 80,109 $ 53,761 $ 151,397 $ 100,308
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, 2015 January 31, 2015 North America $ 47,333 $ 40,521 Other 505 433 Total long-lived assets $ 47,838 $ 40,954

Description of Business and B25

Description of Business and Basis of Presentation - Additional Information (Detail)	6 Months Ended
	Jul. 31, 2015
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) - Distributor	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Number of major distributors	3	3
Hardware Components [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, 2015	Jul. 31, 2014	Jan. 31, 2015
Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	36.00%		44.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	20.00%		18.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	21.00%		16.00%
Accounts Receivable [Member] | Customer D [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	10.00%
Sales Revenue, Net [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	41.00%	54.00%
Sales Revenue, Net [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	20.00%
Sales Revenue, Net [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	18.00%	22.00%

Summary of Significant Accoun28

Summary of Significant Accounting Policies - Percentage of Company's Accounts Receivable and Revenue (Parenthetical) (Detail) - Customer Concentration Risk [Member]	6 Months Ended		12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jan. 31, 2015
Customer B [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	20.00%		18.00%
Customer B [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	20.00%
Customer B [Member] | Maximum [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage		10.00%
Customer D [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	10.00%
Customer D [Member] | Maximum [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage			10.00%
Customer D [Member] | Maximum [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	10.00%	10.00%

Net Loss Per Share - Computatio

Net Loss Per Share - Computation of Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Numerator:
Net loss	$ (30,109)	$ (26,117)	$ (59,095)	$ (45,712)
Denominator:
Weighted-average number of shares outstanding - basic and diluted	78,228	71,381	77,381	70,854
Net loss per share, basic and diluted	$ (0.38)	$ (0.37)	$ (0.76)	$ (0.65)

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, 2015	Jul. 31, 2014
Employee Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	10,033	14,675
Unvested restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	7,823	3,556
Unvested Early Exercised Common Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	411	1,097
Employee stock purchase plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	341	387

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	Jul. 31, 2015	Jan. 31, 2015
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of foreign exchange forward contracts outstanding	$ (71,000)	$ (59,000)

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Derivative Assets and Derivative Liabilities (Detail) - USD ($)	Jul. 31, 2015	Jan. 31, 2015
Level 2 [Member]
Derivative [Line Items]
Fair Value	$ (71,000)	$ (59,000)
Forward Contracts Purchased [Member]
Derivative [Line Items]
Nominal Amount	0	0
Forward Contracts Purchased [Member] | Level 2 [Member]
Derivative [Line Items]
Fair Value	0	0
Forward Contracts Sold [Member]
Derivative [Line Items]
Nominal Amount	11,632,000	17,324,000
Forward Contracts Sold [Member] | Level 2 [Member]
Derivative [Line Items]
Fair Value	$ (71,000)	$ (59,000)

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Jan. 31, 2015
Property, Plant and Equipment [Line Items]
Service inventory held at service depots	$ 5,000		$ 5,000		$ 4,100
Inventory reserves	3,200		3,200		$ 2,300
Depreciation expense related to property and equipment	$ 3,600	$ 2,100	$ 6,938	$ 3,828
Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of property and equipment			3 years

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, 2015	Jan. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 2,513	$ 2,383
Finished goods	7,095	6,871
Evaluation inventory	4,109	2,727
Total	$ 13,717	$ 11,981

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 64,039	$ 50,664
Less: accumulated depreciation	(20,443)	(13,948)
Total property and equipment, net	43,596	36,716
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	11,032	9,226
Lab Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	23,920	17,768
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,886	3,443
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,486	3,287
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	14,493	14,461
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	5,416	1,223
Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,806	$ 1,256

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended			3 Months Ended		6 Months Ended
	Dec. 31, 2014ft²	Jul. 31, 2014USD ($)ft²	Apr. 30, 2013USD ($)ft²	Jul. 31, 2015USD ($)	Jul. 31, 2014USD ($)ft²	Jul. 31, 2015USD ($)	Jul. 31, 2014USD ($)ft²	Apr. 30, 2015USD ($)	Jan. 31, 2014USD ($)
Other Commitments [Line Items]
Rent expense				$ 1.5	$ 1.3	$ 3	$ 2.5
Tenant improvement allowances received									$ 4.9
San Jose California [Member]
Other Commitments [Line Items]
Area of the leased property | ft²			164,608
Contractual obligation			$ 35.5
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]
Area of the leased property | ft²		47,986			47,986		47,986
Additional area of leased property | ft²	38,909
Contractual obligation		$ 5			$ 5		$ 5
Tenant improvement allowances received		1.4			1.4		1.4
Operating lease collateral in the form of a letter of credit		$ 0.9			$ 0.9		$ 0.9	$ 1.1
Term of operating lease		84 months
Lease commencement date	Feb. 1, 2016	Aug. 1, 2014

Commitments and Contingencies37

Commitments and Contingencies - Future Minimum Commitments Under Operating Leases (Detail) $ in Thousands	Jul. 31, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
2016 (remaining six months)	$ 3,456
2,017	6,932
2,018	6,864
2,019	6,683
2,020	6,598
Thereafter	12,354
Future minimum commitments under operating leases	$ 42,887

Stock-Based Compensation - Comp

Stock-Based Compensation - Components of Stock-based Compensation Expense Related to Stock Options, RSUs and ESPP (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 22,321	$ 15,169	$ 43,306	$ 24,726
Cost of Product Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	660	374	1,205	605
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	1,304	593	2,461	986
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	6,638	3,692	12,069	6,132
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	9,389	8,664	19,500	13,585
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 4,330	$ 1,846	$ 8,071	$ 3,418

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 22,321	$ 15,169	$ 43,306	$ 24,726
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 4,100		$ 7,200

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 288	$ 162	$ 500	$ 318

Segments - Additional Informati

Segments - Additional Information (Detail)	6 Months Ended
	Jul. 31, 2015Segment
Segment Reporting [Abstract]
Number of business activity	1

Segments - Schedule of Revenue

Segments - Schedule of Revenue by Country or Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 80,109	$ 53,761	$ 151,397	$ 100,308
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	64,107	45,726	122,010	83,826
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10,201	5,693	19,452	11,744
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,801	2,336	9,935	4,726
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 0	$ 6	$ 0	$ 12

Segments - Schedule of Long-liv

Segments - Schedule of Long-lived Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 47,838	$ 40,954
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	47,333	40,521
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 505	$ 433

Line of Credit - Additional Inf

Line of Credit - Additional Information (Detail) - USD ($)	1 Months Ended	6 Months Ended
	Oct. 31, 2013	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Jul. 31, 2014
Line of Credit Facility [Line Items]
Line of credit facility unused portion commitment fee		0.20%
Line of credit facility renewal date		2014-09
Line of credit facility incremental period		2 years
Line of credit facility expiration date		2016-10
Minimum tangible net worth limit		$ 135,000,000
Credit Facility, current amount outstanding		3,979,000		$ 3,983,000
Reduction of available line related to Letter of Credit issued	$ (900,000)
Remaining Credit Facility available for borrowings		$ 13,000,000
Minimum current ratio		1.25
Wells Fargo Bank, National Association [Member]
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 15,000,000
Line of credit facility financial covenants		(1) 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 $135 million; (2) 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.
North Carolina Office [Member]
Line of Credit Facility [Line Items]
Operating lease collateral in the form of a letter of credit			$ 1,100,000		$ 900,000
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Credit Facility, current amount outstanding		$ 0