Nimble Storage (NMBL) 10-Q 8 Jun 15 2016 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2015	31-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	30-Apr-15
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Trading Symbol	NMBL
Entity Registrant Name	Nimble Storage Inc
Entity Central Index Key	1452751
Current Fiscal Year End Date	-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		77.9

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$201,459	$208,394
Accounts receivable, net of allowance for doubtful accounts of $0 as of April 30, 2015 and January 31, 2015	44,254	35,271
Inventories	12,941	11,981
Prepaid expenses and other current assets	5,140	4,974
Total current assets	263,794	260,620
Property and equipment, net	38,818	36,716
Restricted cash, non-current	3,985	3,983
Other long-term assets	288	255
Total assets	306,885	301,574
Current liabilities:
Accounts payable	20,722	19,799
Accrued compensation and benefits	12,462	21,128
Deferred revenue, current portion	40,315	34,246
Other current liabilities	7,407	8,063
Total current liabilities	80,906	83,236
Deferred revenue, non-current portion	45,943	40,200
Other long-term liabilities	9,706	9,566
Total liabilities	136,555	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 April 30, 2015 and January 31, 2015	0	0
Common stock, par value of $0.001 per share; 750,000 shares authorized as of April 30, 2015 and January 31, 2015; 77,851 and 76,191 shares issued and outstanding as of April 30, 2015 and January 31, 2015, respectively	72	71
Additional paid-in capital	399,437	368,689
Accumulated other comprehensive loss	-255	-250
Accumulated deficit	-228,924	-199,938
Total stockholders' equity	170,330	168,572
Total liabilities and stockholders' equity	$306,885	$301,574

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$0	$0
Preferred stock, par value	$0.00	$0.00
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	$0.00	$0.00
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	77,851,000	76,191,000
Common stock, shares outstanding	77,851,000	76,191,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Revenue:
Product	$60,193	$41,235
Support and service	11,095	5,312
Total revenue	71,288	46,547
Cost of revenue:
Product	19,141	13,011
Support and service	5,652	3,324
Total cost of revenue	24,793	16,335
Gross profit	46,495	30,212
Operating expenses:
Research and development	21,709	14,217
Sales and marketing	44,443	29,202
General and administrative	9,261	6,437
Total operating expenses	75,413	49,856
Loss from operations	-28,918	-19,644
Interest income (expense), net	68	-4
Other income, net	76	209
Loss before provision for income taxes	-28,774	-19,439
Provision for income taxes	212	156
Net loss	($28,986)	($19,595)
Net loss per share, basic and diluted	($0.38)	($0.28)
Weighted-average shares used to compute net loss per share, basic and diluted	76,506	70,319

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	($28,986)	($19,595)
Other comprehensive income (loss), net of taxes:
Change in cumulative translation adjustment	-5	71
Comprehensive loss	($28,991)	($19,524)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Cash flows from operating activities:
Net loss	($28,986)	($19,595)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	3,312	1,758
Stock-based compensation expense	20,985	9,557
Recoveries for allowance for doubtful accounts	-1	-25
Provision (recoveries) for excess and obsolete inventories	25	-18
Changes in operating assets and liabilities:
Accounts receivable	-8,982	-8,102
Inventories	-906	-1,845
Prepaid expenses and other assets	-199	-1,023
Accounts payable	2,625	5,618
Deferred revenue	11,812	8,587
Accrued and other liabilities	-7,992	5,540
Net cash provided by (used in) operating activities	-8,307	452
Cash flows from investing activities:
Purchase of property and equipment	-8,057	-3,728
Change in restricted cash	-2	0
Net cash used in investing activities	-8,059	-3,728
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	2,108	306
Proceeds from issuance of stock under employee stock purchase plan	7,201	0
Excess tax benefit from employee stock plans	124	0
Payment of taxes related to net settlement of restricted stock units	0	-125
Net cash provided by (used in) financing activities	9,433	-1,029
Foreign exchange impact on cash and cash equivalents	-2	70
Net decrease in cash and cash equivalents	-6,935	-4,235
Cash and cash equivalents, beginning of period	208,394	208,486
Cash and cash equivalents, end of period	201,459	204,251
Supplemental disclosure of cash flow information:
Cash paid for income taxes	73	34
Cash paid for interest	13	0
Supplemental disclosure of noncash investing and financing activities:
Vesting of early exercised stock options	377	666
Purchase of property and equipment not yet paid	$3,717	$2,529

Description_of_Business_and_Ba

Description of Business and Basis of Presentation	3 Months Ended
	Apr. 30, 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 as of April 30, 2015, the Consolidated Statements of Operations, the Consolidated Statements of Comprehensive Loss and the Consolidated Statements of Cash Flows for the three months ended April 30, 2015 and April 30, 2014. 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 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 (“Annual Report”) for the year ended January 31, 2015 filed with the SEC on April 2, 2015. The results of operations for the three months ended April 30, 2015 are not necessarily indicative of the results to be expected for the full year.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Apr. 30, 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 months ended April 30, 2015, as compared to the significant accounting policies described in its Annual Report on Form 10-K 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						Three Months Ended April 30,
			April 30, 2015			January 31, 2015			2015			2014
	Customer A			41	%		44	%		42	%		55	%
	Customer B			21	%		18	%		20	%		*
	Customer C			18	%		16	%		17	%		22	%
	*	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 April 30, 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 us for our first quarter of fiscal 2017, although early adoption is permitted, and will be applied on either a prospective or retrospective basis. We are currently evaluating adoption methods and whether this standard will have a material impact on our consolidated financial statements.
	In May 2014, the Financial Accounting Standards Board (FASB) released Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers, requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The guidance in ASU No. 2014-09 supersedes the revenue recognition requirements in Accounting Standards Codification Topic 605, Revenue Recognition and permits the use of either the retrospective or cumulative effect transition method. The Company is required to adopt this standard starting in the first quarter of fiscal 2018. Early adoption is not permitted. The Company has not yet selected a transition method and is currently in the process of determining the impact of ASU No. 2014-09 on its consolidated financial statements and related disclosures.

Net_Loss_Per_Share

Net Loss Per Share	3 Months Ended
	Apr. 30, 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 April 30,
		2015			2014
	Numerator:
	Net loss	$	(28,986	)	$	(19,595	)
	Denominator:
	Weighted-average number of shares outstanding - basic and diluted		76,506			70,319
	Net loss per share - basic and diluted	$	(0.38	)	$	(0.28	)
	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 April 30,
		2015			2014
	Shares subject to options to purchase common stock		11,388			16,107
	Unvested restricted stock units		6,538			2,038
	Unvested early exercised common shares		552			1,332
	Employee stock purchase plan		163			191

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Apr. 30, 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 $51,000 and $59,000 as of April 30, 2015 and January 31, 2015, respectively. The Company’s derivative assets and derivative liabilities as of April 30, 2015 and January 31, 2015 are as follows (in thousands):
			As of April 30, 2015					As of January 31, 2015
			Nominal		Fair Value			Nominal		Fair Value
			Amount					Amount
	Forward Contracts:
	Purchased		$	—	$	—		$	—	$	—
	Sold		$	23,413	$	(51	)	$	17,324	$	(59	)

Balance_Sheet_Components

Balance Sheet Components	3 Months Ended
	Apr. 30, 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 $4.6 million and $4.1 million as of April 30, 2015 and January 31, 2015, respectively. In addition, inventory reserves were $2.7 million and $2.3 million as of April 30, 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
		April 30,			January 31,
		2015			2015
	Raw materials	$	2,342		$	2,383
	Finished goods		6,802			6,871
	Evaluation inventory		3,797			2,727
		$	12,941		$	11,981
	Property and Equipment
	Property and equipment, net consisted of the following (in thousands):
		As of
		April 30,			January 31,
		2015			2015
	Computer equipment	$	9,913		$	9,226
	Lab equipment		20,959			17,768
	Software		3,696			3,443
	Furniture and fixtures		3,335			3,287
	Leasehold improvements		14,276			14,461
	Construction in progress		2,345			1,223
	Demonstration equipment		1,636			1,256
	Total property and equipment		56,160			50,664
	Less: accumulated depreciation		(17,342	)		(13,948	)
	Total property and equipment, net	$	38,818		$	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 $3.3 million and $1.8 million for the three months ended April 30, 2015 and 2014, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 30, 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 $1.2 million for the three months ended April 30, 2015 and 2014, respectively.
	Future minimum commitments under these operating leases as of April 30, 2015 were as follows (in thousands):
	Years ending January 31:
	2016 (remaining nine months)	$	4,984
	2017		6,705
	2018		6,667
	2019		6,567
	2020		6,598
	Thereafter		12,353
		$	43,874
	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 Computer Fraud and Abuse Act. It further alleges 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 January 23, 2015, one of the Company’s insurance carriers, Beazley Insurance Company, Inc., filed a lawsuit in the United States District Court for the Northern District of California, seeking a declaratory judgment and reimbursement against the Company, the individual defendants in the federal and state lawsuits with NetApp, and the Company’s other insurance carrier, National Union Fire Insurance Company of Pittsburg, PA. Through the lawsuit, Beazley was seeking a legal determination that it had no duty to defend or indemnify the defendants in the federal and state NetApp lawsuits, and that it was entitled to reimbursement of amounts paid under its insurance policy with the Company. The Company reached a settlement with Beazley on or about April 9, 2015, which was memorialized in a written settlement agreement. The complaint for the lawsuit was never served and there was no formal activity in the matter other than an agreement to participate in mediation. The suit was formally dismissed on April 22, 2015. The Company voluntarily participated in a mediation with a second insurance carrier on April 13, 2015 and resolved the remaining coverage issues relating to defense of the NetApp litigations.
	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.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Apr. 30, 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, RSUs and ESPP (in thousands):
		Three Months Ended April 30,
		2015		2014
	Cost of product revenue	$	545	$	231
	Cost of support and service revenue		1,157		393
	Research and development		5,431		2,440
	Sales and marketing		10,111		4,921
	General and administrative		3,741		1,572
	Total stock-based compensation expense	$	20,985	$	9,557
	The Company has granted 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 months ended April 30, 2015, the Company recognized $3.1 million stock-based compensation related to these RSUs.

Income_Taxes

Income Taxes	3 Months Ended
	Apr. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes
	The Company’s provision for income taxes of $212,000 and $156,000 for the three months ended April 30, 2015 and 2014, respectively, consisted of current foreign taxes and current state taxes.

Segments

Segments	3 Months Ended
	Apr. 30, 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 April 30,
		2015		2014
	North America	$	57,903	$	38,100
	EMEA		9,251		6,051
	APAC		4,134		2,390
	Other		—		6
	Total revenue	$	71,288	$	46,547
	Long-lived assets located in the following countries and regions as of each period end were as follows (in thousands):
		As of
		April 30, 2015		January 31, 2015
	North America	$	42,582	$	40,521
	Other		509		433
	Total long-lived assets	$	43,091	$	40,954

Line_of_Credit

Line of Credit	3 Months Ended
	Apr. 30, 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 April 30, 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 April 30, 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; (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 April 30, 2015, no amounts had been drawn against the Credit Facility.

Description_of_Business_and_Ba1

Description of Business and Basis of Presentation (Policies)

3 Months Ended

Apr. 30, 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 as of April 30, 2015, the Consolidated Statements of Operations, the Consolidated Statements of Comprehensive Loss and the Consolidated Statements of Cash Flows for the three months ended April 30, 2015 and April 30, 2014. 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 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 (“Annual Report”) for the year ended January 31, 2015 filed with the SEC on April 2, 2015. The results of operations for the three months ended April 30, 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

Three Months Ended April 30,

April 30, 2015

January 31, 2015

2015

2014

Customer A

41

%

44

%

42

%

55

%

Customer B

21

%

18

%

20

%

*

Customer C

18

%

16

%

17

%

22

%

*

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 April 30, 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 us for our first quarter of fiscal 2017, although early adoption is permitted, and will be applied on either a prospective or retrospective basis. We are currently evaluating adoption methods and whether this standard will have a material impact on our consolidated financial statements.

In May 2014, the Financial Accounting Standards Board (FASB) released Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers, requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The guidance in ASU No. 2014-09 supersedes the revenue recognition requirements in Accounting Standards Codification Topic 605, Revenue Recognition and permits the use of either the retrospective or cumulative effect transition method. The Company is required to adopt this standard starting in the first quarter of fiscal 2018. Early adoption is not permitted. The Company has not yet selected a transition method and is currently in the process of determining the impact of ASU No. 2014-09 on its consolidated financial statements and related disclosures.

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_Account1

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Apr. 30, 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						Three Months Ended April 30,
			April 30, 2015			January 31, 2015			2015			2014
	Customer A			41	%		44	%		42	%		55	%
	Customer B			21	%		18	%		20	%		*
	Customer C			18	%		16	%		17	%		22	%
	*	Represents less than 10%.

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	3 Months Ended
	Apr. 30, 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 April 30,
		2015			2014
	Numerator:
	Net loss	$	(28,986	)	$	(19,595	)
	Denominator:
	Weighted-average number of shares outstanding - basic and diluted		76,506			70,319
	Net loss per share - basic and diluted	$	(0.38	)	$	(0.28	)
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 April 30,
		2015			2014
	Shares subject to options to purchase common stock		11,388			16,107
	Unvested restricted stock units		6,538			2,038
	Unvested early exercised common shares		552			1,332
	Employee stock purchase plan		163			191

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Apr. 30, 2015
Fair Value Disclosures [Abstract]
Schedule of Derivative Assets and Derivative Liabilities	The Company’s derivative assets and derivative liabilities as of April 30, 2015 and January 31, 2015 are as follows (in thousands):
		As of April 30, 2015					As of January 31, 2015
		Nominal		Fair Value			Nominal		Fair Value
		Amount					Amount
	Forward Contracts:
	Purchased	$	—	$	—		$	—	$	—
	Sold	$	23,413	$	(51	)	$	17,324	$	(59	)

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	3 Months Ended
	Apr. 30, 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
		April 30,			January 31,
		2015			2015
	Raw materials	$	2,342		$	2,383
	Finished goods		6,802			6,871
	Evaluation inventory		3,797			2,727
		$	12,941		$	11,981
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands):
		As of
		April 30,			January 31,
		2015			2015
	Computer equipment	$	9,913		$	9,226
	Lab equipment		20,959			17,768
	Software		3,696			3,443
	Furniture and fixtures		3,335			3,287
	Leasehold improvements		14,276			14,461
	Construction in progress		2,345			1,223
	Demonstration equipment		1,636			1,256
	Total property and equipment		56,160			50,664
	Less: accumulated depreciation		(17,342	)		(13,948	)
	Total property and equipment, net	$	38,818		$	36,716

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Apr. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Commitments Under Operating Leases	Future minimum commitments under these operating leases as of April 30, 2015 were as follows (in thousands):
	Years ending January 31:
	2016 (remaining nine months)	$	4,984
	2017		6,705
	2018		6,667
	2019		6,567
	2020		6,598
	Thereafter		12,353
		$	43,874

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Apr. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Components of Stock-based Compensation Expense Related to Stock Options, RSUs and ESPP	The following table summarizes the components of stock-based compensation expense related to stock options, RSUs and ESPP (in thousands):
		Three Months Ended April 30,
		2015		2014
	Cost of product revenue	$	545	$	231
	Cost of support and service revenue		1,157		393
	Research and development		5,431		2,440
	Sales and marketing		10,111		4,921
	General and administrative		3,741		1,572
	Total stock-based compensation expense	$	20,985	$	9,557

Segments_Tables

Segments (Tables)	3 Months Ended
	Apr. 30, 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 April 30,
		2015		2014
	North America	$	57,903	$	38,100
	EMEA		9,251		6,051
	APAC		4,134		2,390
	Other		—		6
	Total revenue	$	71,288	$	46,547
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
		April 30, 2015		January 31, 2015
	North America	$	42,582	$	40,521
	Other		509		433
	Total long-lived assets	$	43,091	$	40,954

Description_of_Business_and_Ba2

Description of Business and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Apr. 30, 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_Account2

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Jan. 31, 2014	Oct. 31, 2013	Apr. 30, 2015
	Distributor	Distributor
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_Account3

Summary of Significant Accounting Policies - Percentage of Company's Accounts Receivable and Revenue (Detail) (Customer Concentration Risk [Member])	3 Months Ended	12 Months Ended	3 Months Ended
	Apr. 30, 2015	Jan. 31, 2015	Apr. 30, 2014
Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	41.00%	44.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	21.00%	18.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	18.00%	16.00%
Sales Revenue, Net [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	42.00%		55.00%
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	17.00%		22.00%

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Percentage of Company's Accounts Receivable and Revenue (Parenthetical) (Detail) (Customer Concentration Risk [Member], Customer B [Member], Sales Revenue, Net [Member])	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Concentration Risk [Line Items]
Concentration risk, Percentage	20.00%
Maximum [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	10.00%	10.00%

Net_Loss_Per_Share_Computation

Net Loss Per Share - Computation of Net Loss Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Numerator:
Net loss	($28,986)	($19,595)
Denominator:
Weighted-average number of shares outstanding - basic and diluted	76,506	70,319
Net loss per share - basic and diluted	($0.38)	($0.28)

Net_Loss_Per_Share_Schedule_of

Net Loss Per Share - Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 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	11,388	16,107
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	6,538	2,038
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	552	1,332
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	163	191

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Apr. 30, 2015	Jan. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair value of foreign exchange forward contracts outstanding	$51,000	$59,000

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Derivative Assets and Derivative Liabilities (Detail) (USD $)	Apr. 30, 2015	Jan. 31, 2015
Forward Contracts Purchased [Member]
Derivative [Line Items]
Nominal Amount	$0	$0
Fair Value	0	0
Forward Contracts Sold [Member]
Derivative [Line Items]
Nominal Amount	23,413,000	17,324,000
Fair Value	($51,000)	($59,000)

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Jan. 31, 2015
Property, Plant and Equipment [Line Items]
Service inventory held at service depots	$4,600,000		$4,100,000
Inventory reserves	2,700,000		2,300,000
Depreciation expense related to property and equipment	$3,312,000	$1,758,000
Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of property and equipment	3 years

Balance_Sheet_Components_Summa

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 $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Raw materials	$2,342	$2,383
Finished goods	6,802	6,871
Evaluation inventory	3,797	2,727
Total	$12,941	$11,981

Balance_Sheet_Components_Sched

Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Total property and equipment	$56,160	$50,664
Less: accumulated depreciation	-17,342	-13,948
Total property and equipment, net	38,818	36,716
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	9,913	9,226
Lab Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	20,959	17,768
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,696	3,443
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,335	3,287
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	14,276	14,461
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	2,345	1,223
Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$1,636	$1,256

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013	Dec. 31, 2014	Jul. 31, 2014	Jan. 31, 2014
			sqft	sqft	sqft
Other Commitments [Line Items]
Rent expense	$1.50	$1.20
Tenant improvement allowances received						4.9
San Jose California [Member]
Other Commitments [Line Items]
Area of the leased property			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			1-Nov-13
North Carolina Office [Member]
Other Commitments [Line Items]
Area of the leased property					47,986
Additional area of leased property				38,909
Contractual obligation					5
Tenant improvement allowances received					1.4
Operating lease collateral in the form of a letter of credit	$1.10				$0.90
Term of operating lease					84 months
Lease commencement date				1-Feb-16	1-Aug-14

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Commitments Under Operating Leases (Detail) (USD $)	Apr. 30, 2015
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2016 (remaining nine months)	$4,984
2017	6,705
2018	6,667
2019	6,567
2020	6,598
Thereafter	12,353
Future minimum commitments under operating leases	$43,874

StockBased_Compensation_Compon

Stock-Based Compensation - Components of Stock-based Compensation Expense Related to Stock Options, RSUs and ESPP (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$20,985	$9,557
Cost of Product Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	545	231
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	1,157	393
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	5,431	2,440
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	10,111	4,921
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$3,741	$1,572

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$20,985	$9,557
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$3,100

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes	$212	$156

Segments_Additional_Informatio

Segments - Additional Information (Detail)	3 Months Ended
	Apr. 30, 2015
	Segment
Segment Reporting [Abstract]
Number of business activity	1

Segments_Schedule_of_Revenue_b

Segments - Schedule of Revenue by Country or Region (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$71,288	$46,547
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	57,903	38,100
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,251	6,051
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	4,134	2,390
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$0	$6

Segments_Schedule_of_Longlived

Segments - Schedule of Long-lived Assets (Detail) (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$43,091	$40,954
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	42,582	40,521
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$509	$433

Line_of_Credit_Additional_Info

Line of Credit - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Oct. 31, 2013	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
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.
Minimum tangible net worth limit		$135,000,000
Credit Facility, current amount outstanding		3,985,000	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
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