Pure Storage (PSTG) 10-Q 3 Jun 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Apr. 30, 2016	May. 31, 2016
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Trading Symbol	PSTG
Entity Registrant Name	Pure Storage, Inc.
Entity Central Index Key	1,474,432
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Class A Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		69,104,013
Class B Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		125,307,519

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 286,096	$ 604,742
Marketable securities	320,899	0
Accounts receivable, net of allowance of $944 and $1,509 as of January 31, 2016 and April 30, 2016	97,164	126,324
Inventory	21,980	20,649
Deferred commissions, current	12,136	15,703
Prepaid expenses and other current assets	23,154	20,652
Total current assets	761,429	788,070
Property and equipment, net	71,255	52,629
Intangible assets, net	6,654	6,980
Deferred income taxes, non-current	605	536
Other assets, non-current	21,532	22,568
Total assets	861,475	870,783
Current liabilities:
Accounts payable	42,444	38,187
Accrued compensation and benefits	18,560	32,995
Accrued expenses and other liabilities	15,970	14,076
Deferred revenue, current	107,223	94,514
Liability related to early exercised stock options	4,584	4,760
Total current liabilities	188,781	184,532
Deferred revenue, non-current	129,634	121,690
Other liabilities, non-current	1,643	1,207
Total liabilities	320,058	307,429
Commitments and contingencies (Note 5)	0	0
Stockholders’ equity:
Preferred stock, par value of $0.0001 per share— 20,000 shares authorized as of January 31, 2016 and April 30, 2016; no shares issued and outstanding as of January 31, 2016 and April 30, 2016	0	0
Class A and Class B common stock, par value of $0.0001 per share— 2,250,000 (Class A 2,000,000, Class B 250,000) shares authorized as of January 31, 2016 and April 30, 2016; 190,509 (Class A 28,769, Class B 161,740) and 194,124 (Class A 66,438, Class B 127,686) shares issued and outstanding as of January 31, 2016 and April 30, 2016	19	19
Additional paid-in capital	1,159,385	1,118,670
Accumulated other comprehensive income	807	0
Accumulated deficit	(618,794)	(555,335)
Total stockholders’ equity	541,417	563,354
Total liabilities and stockholders’ equity	$ 861,475	$ 870,783

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Accounts receivable, net of allowance	$ 1,509	$ 944
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	2,250,000,000	2,250,000,000
Common stock, shares issued	194,124,000	190,509,000
Common stock, shares outstanding	194,124,000	190,509,000
Class A Common Stock
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares issued	66,438,448	28,769,000
Common stock, shares outstanding	66,438,448	28,769,000
Class B Common Stock
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	127,685,960	161,740,000
Common stock, shares outstanding	127,685,960	161,740,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Revenue:
Product	$ 111,738	$ 63,618
Support	28,209	10,459
Total revenue	139,947	74,077
Cost of revenue:
Product	34,042	22,712
Support	12,893	6,924
Total cost of revenue	46,935	29,636
Gross profit	93,012	44,441
Operating expenses:
Research and development	52,500	31,682
Sales and marketing	82,816	48,327
General and administrative	21,482	12,692
Total operating expenses	156,798	92,701
Loss from operations	(63,786)	(48,260)
Other income (expense), net	1,282	(703)
Loss before provision for income taxes	(62,504)	(48,963)
Provision for income taxes	955	157
Net loss	$ (63,459)	$ (49,120)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.34)	$ (1.51)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	189,283	32,605

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2016	Apr. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (63,459)	$ (49,120)
Other comprehensive income :
Change in net unrealized gains on available-for-sale securities	[1]	807	0
Comprehensive loss		$ (62,652)	$ (49,120)
[1]	Tax effect was not material.

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (63,459)	$ (49,120)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	10,432	6,479
Stock-based compensation expense	22,134	8,859
Other	484	0
Changes in operating assets and liabilities:
Accounts receivable, net	28,593	4,070
Inventory	(2,623)	(1,470)
Deferred commissions	4,141	1,763
Prepaid expenses and other assets	(2,744)	(2,985)
Accounts payable	166	(285)
Accrued compensation and other liabilities	(11,017)	(3,626)
Deferred revenue	20,653	22,198
Net cash provided by (used in) operating activities	6,760	(14,117)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(24,376)	(6,742)
Purchases of marketable securities	(343,466)	0
Sales of marketable securities	23,327	0
Change in restricted cash	706	0
Net cash used in investing activities	(343,809)	(6,742)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from exercise of stock options	3,324	1,691
Proceeds from issuance of common stock under employee stock purchase plan	15,079	0
Payments of deferred offering costs	0	(313)
Net cash provided by financing activities	18,403	1,378
Net decrease in cash and cash equivalents	(318,646)	(19,481)
Cash and cash equivalents, beginning of period	604,742	192,707
Cash and cash equivalents, end of period	286,096	173,226
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for income taxes	1,323	274
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION
Property and equipment purchased but not yet paid	9,448	4,580
Vesting of early exercised stock options	176	430
Unpaid deferred offering costs	$ 0	$ 679

Business Overview

Business Overview	3 Months Ended
	Apr. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business Overview	Note 1. Business Overview Organization and Description of Business Pure Storage, Inc. (the Company, we, us, or other similar pronouns) was originally incorporated in the state of Delaware in October 2009 under the name OS76, Inc. In January 2010, we changed our name to Pure Storage, Inc. We provide an enterprise data storage platform that transforms business through a dramatic increase in performance and reduction in complexity and costs. We are headquartered in Mountain View, California and have wholly owned subsidiaries throughout the world.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Apr. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Note 2. Basis of Presentation and Summary of Significant Accounting Policies Principles of Consolidation The condensed consolidated financial statements include the accounts of the company and our wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Unaudited Interim Consolidated Financial Information The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) and applicable rules and regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended January 31, 2016. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year 2017 or any future period. 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 and disclosed in the financial statements and accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of best estimate of selling price included in multiple-deliverable revenue arrangements, sales commissions, useful lives of intangible assets and property and equipment, fair values of stock-based awards, provision for income taxes, including related reserves and contingent liabilities, among others. Management bases its estimates on historical experience and on various other assumptions which are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Restricted Cash Restricted cash is comprised of cash collateral for the letters of credit related to our leases. As of January 31, 2016 and April 30, 2016, we had restricted cash of $7.1 million and $6.4 million, which was included in other assets, non-current, in the condensed consolidated balance sheets. Marketable Securities We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification at each balance sheet date. We may sell these securities at any time for use in current operations even if they have not yet reached maturity. As a result, we classify our securities, including those with maturities beyond twelve months, as current assets in the accompanying condensed consolidated balance sheets. We carry these securities at fair value and record unrealized gains and losses, net of tax, in other comprehensive income (loss), which is reflected as a component of stockholders’ equity. We determine any realized gains or losses on the sale of marketable securities on a specific identification method. In addition, we evaluate our securities to assess whether those with unrealized loss positions are other than temporarily impaired. Realized gains and losses and declines in value deemed to be other than temporary are reported in other income (expense), net, in the condensed consolidated statements of operations. Deferred Commissions Deferred commissions consist of direct and incremental costs paid to our sales force related to customer contracts. The deferred commission amounts are recoverable through the revenue streams that will be recognized under the related customer contracts. Direct sales commissions are deferred when earned and amortized over the same period that revenue is recognized from the related customer contract. Amortization of deferred commissions is included in sales and marketing expense in the condensed consolidated statements of operations. As of January 31, 2016 and April 30, 2016, we recorded deferred commissions, current, of $15.7 million and $12.1 million, and deferred commissions, non-current, of $14.3 million and $13.7 million, in other assets, non-current, in the condensed consolidated balance sheets. During the three months ended April 30, 2015 and 2016, we recognized sales commission expenses of $8.9 million, and $17.6 million, respectively. Recent Accounting Pronouncements Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers Revenue from Contracts with Customers In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting

Financial Instruments

Financial Instruments	3 Months Ended
	Apr. 30, 2016
Investments Debt And Equity Securities [Abstract]
Financial Instruments	Note 3. Financial Instruments Fair Value Measurements We measure our cash equivalents, marketable securities and restricted cash at fair value on a recurring basis. We define fair value as the exchange price that would be received from sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: £ Level I —Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities; £ Level II —Observable 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; and £ Level III —Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs are based on our own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation. We classify our cash equivalents, marketable securities and restricted cash within Level 1 or Level 2 because they are valued using either quoted market prices or inputs other than quoted prices which are directly or indirectly observable in the market, including readily-available pricing sources for the identical underlying security which may not be actively traded. Our fixed income available-for-sale securities consist of high quality, investment grade securities from diverse issuers. The valuation techniques used to measure the fair value of our marketable securities were derived from non-binding market consensus prices that are corroborated by observable market data, quoted market prices for similar instruments, or pricing models such as discounted cash flow techniques. Cash Equivalents, Marketable Securities and Restricted Cash The following tables summarize our cash equivalents, marketable securities and restricted cash by significant investment categories as of January 31, 2016 and April 30, 2016 (in thousands): As of January 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Restricted Cash Level 1 Money market funds $ 45,614 $ — $ — $ 45,614 $ 45,614 $ — Level 2 Certificate of deposits 7,132 — — 7,132 — 7,132 Total $ 52,746 $ — $ — $ 52,746 $ 45,614 $ 7,132 As of April 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Marketable Securities Restricted Cash Level 2 U.S. government notes $ 130,516 $ 63 $ (6 ) $ 130,573 $ 28,813 $ 101,760 — U.S. government agencies 31,969 21 (1 ) 31,989 — 31,989 — Corporate debt securities 184,677 752 (27 ) 185,402 — 185,402 — Foreign government bonds 1,743 5 — 1,748 — 1,748 — Money market accounts — — — — — — 6,427 Total $ 348,905 $ 841 $ (34 ) $ 349,712 $ 28,813 $ 320,899 $ 6,427 The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands): As of April 30, 2016 Amortized Cost Fair Value Due within one year $ 64,414 $ 64,456 Due in one to five years 255,678 256,443 Total $ 320,092 $ 320,899 As of April 30, 2016, there were no securities that were in an unrealized loss position for more than 12 months. Based on our evaluation of available evidence, we concluded that the gross unrealized losses on our marketable securities as of April 30, 2016 were temporary in nature. Less than 12 months Fair Value Unrealized Loss U.S. government notes $ 28,883 $ (6 ) U.S. government agencies 2,995 (1 ) Corporate debt securities 25,213 (27 ) Total $ 57,091 $ (34 ) Gross realized gains or losses from sales of cash equivalents and marketable securities for the three months ended April 30, 2016 were not significant.

Balance Sheet Components

Balance Sheet Components	3 Months Ended
	Apr. 30, 2016
Balance Sheet Components Disclosure [Abstract]
Balance Sheet Components	Note 4. Balance Sheet Components Property and Equipment, Net Property and equipment, net, consists of the following (in thousands): As 2016 As of April 30, 2016 Test equipment $ 65,663 $ 83,384 Computer, equipment and software 31,388 40,442 Furniture and fixtures 2,852 3,532 Leasehold improvements 4,935 6,055 Total property and equipment 104,838 133,413 Less: accumulated depreciation and amortization (52,209 ) (62,158 ) Property and equipment, net $ 52,629 $ 71,255 Depreciation and amortization expense was $6.2 million and $10.1 million for the three months ended April 30, 2015 and 2016, respectively. Intangible Assets, Net Intangible assets, net, consist of the following (in thousands): As of January 31, 2016 As of April 30, 2016 Technology patents $ 9,125 $ 9,125 Accumulated amortization (2,145 ) (2,471 ) Intangible assets, net $ 6,980 $ 6,654 Intangible assets amortization expense was $326,000 for the three months ended April 30, 2015 and 2016. Due to the defensive nature of these patents, the amortization is included in general and administrative expenses in the condensed consolidated statements of operations. As of April 30, 2016, expected amortization expense for intangible assets for each of the next five years and thereafter is as follows (in thousands): Fiscal Years Ending January 31, Estimated Future Amortization Expense Remainder of 2017 $ 978 2018 1,304 2019 1,304 2020 1,304 2021 1,304 Thereafter 460 Total $ 6,654 Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consist of the following (in thousands): As of January 31, 2016 As of April 30, 2016 Sales and use tax payable $ 299 $ 151 Accrued professional fees 3,044 2,777 Accrued marketing 2,684 3,804 Accrued travel and entertainment expenses 2,182 2,458 Income tax payable 1,791 1,292 Other accrued liabilities 4,076 5,488 Total accrued expenses and other liabilities $ 14,076 $ 15,970

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 5. Commitments and Contingencies Operating Leases During the three months ended April 30, 2016, we entered into three lease agreements for office facilities with total lease obligations of approximately $10.5 million with lease periods expiring through June 2021. Letters of Credit As of January 31, 2016 and April 30, 2016, we had outstanding letters of credit in the aggregate amount of $7.1 million and $6.4 million respectively, in connection with our facility leases. The letters of credit are collateralized by restricted cash in the same amount and mature at various dates through March 2023. Legal Matters On November 4, 2013, EMC filed a complaint against us in the U.S. District Court for the District of Massachusetts, alleging that our hiring of EMC employees evidences a scheme to misappropriate EMC’s confidential information and trade secrets and to unlawfully interfere with EMC’s business relationships with its customers and contractual relationships with its employees. The complaint seeks damages and injunctive relief. On November 26, 2013, we answered and counterclaimed, denying EMC’s allegations and alleging that EMC surreptitiously obtained and tested our product in a manner that constituted misappropriation of our trade secrets, a breach of contract, breach of the covenant of good faith and fair dealing, unlawful interference with our contractual and business relationships as well as unfair competition and a violation of Massachusetts General Law 93A, Sections 2 and 11. On November 18, 2014, we amended our counterclaim, additionally alleging that EMC has engaged in commercial disparagement, violated the Lanham Act and engaged in defamation. Our counterclaim seeks damages and declaratory and injunctive relief. Fact and expert discovery has closed. Dispositive motions were filed in May 2016. The District Court has scheduled a trial date for October 24, 2016. In a separate litigation matter, on November 26, 2013, EMC filed a complaint against us in the U.S. District Court for the District of Delaware, alleging infringement of five patents held by EMC. The five patents are U.S. Patent 6,904,556 entitled “Systems and Methods Which Utilize Parity Sets,” U.S. Patent 6,915,475 entitled “Data Integrity Management for Data Storage Systems,” U.S. Patent 7,373,464 entitled “Efficient Data Storage System” and the related U.S. Patent 7,434,015 entitled “Efficient Data Storage System” and U.S. Patent 8,375,187 entitled “I/O Scheduling For Flash Drives.” The complaint seeks damages and injunctive and equitable relief, with respect to the FlashArray On March 15, 2016, the jury returned a verdict finding that we did not infringe U.S. Patent Nos. 6,904,556 and 7,373,464, and that the ‘015 patent, which the District Court ruled us to have infringed, is valid. The jury awarded EMC $14.0 million in royalty damages for infringement of the '015 patent. The jury declined to award any lost profit damages. On March 21, 2016, EMC filed an additional complaint for infringement of the '015 patent with respect to the FlashArray//m FlashArray//m From time to time, we have become involved in claims and other legal matters arising in the normal course of business. We investigate these claims as they arise. Although claims are inherently unpredictable, we currently are not aware of any matters that may have a material adverse effect on our business, financial position, results of operations or cash flows. Accordingly we have not recorded any loss contingency on our consolidated balance sheet as of April 30, 2016. Indemnification Our arrangements generally include certain provisions for indemnifying customers against liabilities if our products or services infringe a third party’s intellectual property rights. Other guarantees or indemnification arrangements include guarantees of product and service performance and standby letters of credit for lease facilities. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. To date, we have not incurred any material costs as a result of such obligations and have not accrued any liabilities related to such obligations in the consolidated financial statements. In addition, we indemnify our 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.

Line of Credit

Line of Credit	3 Months Ended
	Apr. 30, 2016
Debt Disclosure [Abstract]
Line of Credit	Note 6. Line of Credit In August 2014, we entered into a two-year loan and security agreement with a financial institution to provide up to $15.0 million on a revolving line based on 80% of qualifying accounts receivable. Borrowings under this revolving line of credit bear interest at prime rate plus 1%. Interest expense is paid on a monthly basis based on the principal amount outstanding under the line of credit. As of January 31, 2016, we had no borrowings from this line of credit and we were in compliance with our financial covenants. In April 2016, we early terminated this line of credit.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Apr. 30, 2016
Equity [Abstract]
Stockholders' Equity	Note 7. Stockholders’ Equity Preferred Stock Upon the closing of our initial public offering (IPO) in October 2015, we filed an Amended and Restated Certificate of Incorporation, which authorized 20,000,000 shares of undesignated preferred stock, the rights, preferences and privileges of which may be designated from time to time by our board of directors. As of April 30, 2016, there were no shares of preferred stock issued or outstanding. Class A and Class B Common Stock We have two classes of authorized common stock, Class A common stock and Class B common stock. As of April 30, 2016, we had 2,000,000,000 shares of Class A common stock authorized with a par value of $0.0001 per share and 250,000,000 shares of Class B common stock authorized with a par value of $0.0001 per share. As of April 30, 2016, 66,438,448 shares of Class A common stock were issued and outstanding and 127,685,960 shares of Class B common stock were issued and outstanding.

Equity Incentive Plans

Equity Incentive Plans	3 Months Ended
	Apr. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity Incentive Plans	Note 8. Equity Incentive Plans Equity Incentive Plans We maintain two equity incentive plans: the 2009 Equity Incentive Plan (our 2009 Plan) and the 2015 Equity Incentive Plan (our 2015 Plan). In August 2015, our board of directors adopted, and in September 2015 our stockholders approved, the 2015 Plan, which became effective in connection with our IPO and serves as the successor to our 2009 Plan. Our 2015 Plan provides for grants of incentive stock options,-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance stock awards, performance cash awards, and other forms of stock awards to our employees, directors and consultants. We ceased grants of new awards under our 2009 Plan after the effective date of our 2015 Plan, and no new grants will be made from our 2009 Plan. Outstanding awards granted under our 2009 Plan will remain subject to the terms of our 2009 Plan and applicable award agreements, until such outstanding awards that are stock options are exercised, terminated or expired by their terms, and until any restricted stock awards become vested or are forfeited. We have initially reserved 27,000,000 shares of our Class A common stock for issuance under our 2015 Plan. The number of shares reserved for issuance under our 2015 Plan will increase automatically on the first day of February of each of 2016 through 2025, in an amount equal to 5% of the total number of shares of our capital stock outstanding as of the immediately preceding January 31. The exercise price of stock options will generally not be less than 100% of the fair market value of our common stock on the date of grant, as determined by our board of directors. Our equity awards generally vest over a two to four year period and expire no later than ten years from the date of grant. 2015 Employee Stock Purchase Plan In August 2015, our board of directors adopted and our stockholders approved, the 2015 Employee Stock Purchase Plan (2015 ESPP), which became effective in connection with our IPO. A total of 3,500,000 shares of Class A common stock was initially reserved for issuance under the 2015 ESPP. The 2015 ESPP allows eligible employees to purchase shares of our Class A common stock at a discount through payroll deductions (or other payroll contributions) of up to 30% of their eligible compensation, subject to a cap of 3,000 shares on any purchase date or $25,000 in any calendar year (as determined under applicable tax rules). Except for the initial offering period, the 2015 ESPP provides for 24 month offering periods beginning March 16th and September 16th of each year, and each offering period will consist of four six-month purchase periods. The initial offering period began in October 2015, and will end on September 15, 2017. On each purchase date, eligible employees will purchase our Class A common stock at a price per share equal to 85% of the lesser of the fair market value of our Class A common stock (1) on the first trading day of the applicable offering period or (2) the purchase date. Additionally, in accordance with our 2015 ESPP, if the closing stock price on the offering date of a new offering falls below the closing stock price on the offering date of an ongoing offering, the ongoing offering terminates immediately following the purchase of ESPP shares on the purchase date immediately preceding the new offering and participants in the terminated ongoing offering will automatically be enrolled in the new offering (ESPP reset). As the closing stock price on the new offering date of March 16, 2016 was lower than the closing stock price on the initial offering date of October 7, 2015, the initial offering period ended on March 15, 2016 and an ESPP reset was triggered. This reset resulted in a modification charge of approximately $10.3 million, net of estimated forfeiture, which will be recognized over the new 24-month offering period. During the three months ended April 30, 2016, we recognized $4.2 million of stock-based compensation expense related to our 2015 ESPP. As of April 30, 2016, there was $28.7 million of unrecognized stock-based compensation expense, net of estimated forfeiture related to our 2015 ESPP that is expected to be recognized over the term of the related offering periods. Stock Options A summary of activity under our equity incentive plans and related information is as follows: Options Outstanding Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Life (In Years) Aggregate Intrinsic Value (in thousands) Balance as of January 31, 2016 68,879,087 $ 6.43 7.9 $ 505,131 Options granted 1,891,000 12.75 Options exercised (2,181,055 ) 1.40 Options cancelled (691,251 ) 11.27 Balance as of April 30, 2016 67,897,781 $ 6.72 7.7 $ 562,758 Vested and exercisable as of April 30, 2016 25,495,004 $ 2.64 6.6 $ 304,484 Vested and expected to vest as of April 30, 2016 65,641,943 $ 6.64 7.7 $ 549,018 The aggregate intrinsic value of options vested and exercisable and vested and expected to vest as of April 30, 2016 is calculated based on the difference between the exercise price and the closing price of $14.55 of our Class A common stock on April 29, 2016. As of April 30, 2016, total unrecognized employee compensation cost, net of estimated forfeitures, was $179.1 million, which is expected to be recognized over a weighted-average period of approximately 3.5 years. To the extent the actual forfeiture rate is different from what we have estimated, stock-based compensation related to these awards will be different from our expectations. During the three months ended April 30, 2015 and 2016, we granted options to purchase 83,000 and 780,000 shares of common stock, respectively, net of cancellations that vest upon satisfaction of a performance condition. For those options that management determined that it is probable that the performance condition will be satisfied, stock-based compensation expense of $440,000 and $549,000 was recognized during the three months ended April 30, 2015 and 2016 respectively. Restricted Stock Units A summary of the restricted stock unit activity under our 2015 Plan and related information is as follows: Number of Restricted Stock Units Outstanding Weighted- Average Grant Date Fair Value Unvested balance as of January 31, 2016 53,000 $ 16.98 Granted 4,334,600 14.27 Vested — — Forfeited / cancelled (10,500 ) 13.91 Unvested balance as of April 30, 2016 4,377,100 $ 14.30 Expected to vest as of April 30, 2016 4,144,238 $ 14.30 As of April 30, 2016, total unrecognized employee compensation cost, net of estimated forfeitures, related to outstanding restricted stock units was $ 57.5 2.9 Stock-Based Compensation Expense The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands): Three Months Ended April 30, 2015 2016 Cost of revenue—product $ 56 $ 102 Cost of revenue—support 333 1,051 Research and development 3,625 11,220 Sales and marketing 3,444 7,237 General and administrative 1,401 2,524 Total stock-based compensation expense $ 8,859 $ 22,134

Net Loss per Share Attributable

Net Loss per Share Attributable to Common Stockholders	3 Months Ended
	Apr. 30, 2016
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Common Stockholders	Note 9. Net Loss per Share Attributable to Common Stockholders Basic and diluted net loss per share attributable to common stockholders is presented in conformity with the two-class method required for participating securities. We consider all series of our convertible preferred stock to be participating securities. Under the two-class method, the net loss attributable to common stockholders is not allocated to the convertible preferred stock as the holders of our convertible preferred stock do not have a contractual obligation to share in our losses. Basic net loss per share attributable to common stockholders is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. The diluted net loss per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, convertible preferred stock, stock options, unvested restricted stock awards, repurchasable shares from early exercised stock options and shares subject to ESPP withholding are considered to be common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is anti-dilutive. The rights, including the liquidation and dividend rights, of the holders of our Class A and Class B common stock are identical, except with respect to voting. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share attributed to common stockholders will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis. We did not present dilutive net loss per share on an if-converted basis because the impact was not dilutive. The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data): Three Months Ended April 30, 2015 2016 Net loss $ (49,120 ) $ (63,459 ) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 32,605 189,283 Net loss per share attributable to common stockholders, basic and diluted $ (1.51 ) $ (0.34 ) The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive (in thousands): Three Months Ended April 30, 2015 2016 Convertible preferred stock (on an if-converted basis) 122,281 — Stock options to purchase common stock 55,325 68,407 Restricted stock units — 1,375 Early exercised stock options 4,406 2,666 Employee stock purchase plan — 364 Total 182,012 72,812

Income Taxes

Income Taxes	3 Months Ended
	Apr. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Note 10. Income Taxes Our provision for income taxes was primarily due to taxes on international operations and state income taxes. The difference between the provision for income taxes that would be derived by applying the statutory rate to our loss before income taxes and the provision for income taxes recorded was primarily attributable to changes in our valuation allowance, non-deductible stock-based compensation expense and the tax rate differential between the U.S. and foreign countries. As of April 30, 2016, there were no material changes to either the nature or the amounts of the uncertain tax positions previously determined for the fiscal year ended January 31, 2016.

Segment Information

Segment Information	3 Months Ended
	Apr. 30, 2016
Segment Reporting [Abstract]
Segment Information	Note 11. Segment Information Our chief operating decision maker is a group which is comprised of our Chief Executive Officer, our Chief Financial Officer, and our President. This group reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. We have one business activity and there are no segment managers who are held accountable for operations or operating results. Accordingly, we have a single reportable segment. The following table sets forth revenue by geographic area based on the billing address of our customers (in thousands, unaudited): Three Months Ended April 30, 2015 2016 United States $ 58,674 $ 111,227 Rest of the world 15,403 28,720 Total revenue $ 74,077 $ 139,947 Long-lived assets by geographic area are summarized as follows (in thousands, unaudited): As 2016 As of April 30, 2016 United States $ 50,501 $ 68,058 Rest of the world 2,128 3,197 Total long-lived assets $ 52,629 $ 71,255

Subsequent Events

Subsequent Events	3 Months Ended
	Apr. 30, 2016
Subsequent Events [Abstract]
Subsequent Events

Basis of Presentation and Sum19

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Apr. 30, 2016
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the company and our wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Unaudited Interim Consolidated Financial Information	Unaudited Interim Consolidated Financial Information The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) and applicable rules and regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended January 31, 2016. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year 2017 or any future period.
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 and disclosed in the financial statements and accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of best estimate of selling price included in multiple-deliverable revenue arrangements, sales commissions, useful lives of intangible assets and property and equipment, fair values of stock-based awards, provision for income taxes, including related reserves and contingent liabilities, among others. Management bases its estimates on historical experience and on various other assumptions which are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
Restricted Cash	Restricted Cash Restricted cash is comprised of cash collateral for the letters of credit related to our leases. As of January 31, 2016 and April 30, 2016, we had restricted cash of $7.1 million and $6.4 million, which was included in other assets, non-current, in the condensed consolidated balance sheets.
Marketable Securities	Marketable Securities We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification at each balance sheet date. We may sell these securities at any time for use in current operations even if they have not yet reached maturity. As a result, we classify our securities, including those with maturities beyond twelve months, as current assets in the accompanying condensed consolidated balance sheets. We carry these securities at fair value and record unrealized gains and losses, net of tax, in other comprehensive income (loss), which is reflected as a component of stockholders’ equity. We determine any realized gains or losses on the sale of marketable securities on a specific identification method. In addition, we evaluate our securities to assess whether those with unrealized loss positions are other than temporarily impaired. Realized gains and losses and declines in value deemed to be other than temporary are reported in other income (expense), net, in the condensed consolidated statements of operations.
Deferred Commissions	Deferred Commissions Deferred commissions consist of direct and incremental costs paid to our sales force related to customer contracts. The deferred commission amounts are recoverable through the revenue streams that will be recognized under the related customer contracts. Direct sales commissions are deferred when earned and amortized over the same period that revenue is recognized from the related customer contract. Amortization of deferred commissions is included in sales and marketing expense in the condensed consolidated statements of operations. As of January 31, 2016 and April 30, 2016, we recorded deferred commissions, current, of $15.7 million and $12.1 million, and deferred commissions, non-current, of $14.3 million and $13.7 million, in other assets, non-current, in the condensed consolidated balance sheets. During the three months ended April 30, 2015 and 2016, we recognized sales commission expenses of $8.9 million, and $17.6 million, respectively.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers Revenue from Contracts with Customers In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting

Financial Instruments (Tables)

Financial Instruments (Tables)	3 Months Ended
	Apr. 30, 2016
Investments Debt And Equity Securities [Abstract]
Summary of Cash Equivalents, Marketable Securities and Restricted Cash by Significant Investment Categories	The following tables summarize our cash equivalents, marketable securities and restricted cash by significant investment categories as of January 31, 2016 and April 30, 2016 (in thousands): As of January 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Restricted Cash Level 1 Money market funds $ 45,614 $ — $ — $ 45,614 $ 45,614 $ — Level 2 Certificate of deposits 7,132 — — 7,132 — 7,132 Total $ 52,746 $ — $ — $ 52,746 $ 45,614 $ 7,132 As of April 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Marketable Securities Restricted Cash Level 2 U.S. government notes $ 130,516 $ 63 $ (6 ) $ 130,573 $ 28,813 $ 101,760 — U.S. government agencies 31,969 21 (1 ) 31,989 — 31,989 — Corporate debt securities 184,677 752 (27 ) 185,402 — 185,402 — Foreign government bonds 1,743 5 — 1,748 — 1,748 — Money market accounts — — — — — — 6,427 Total $ 348,905 $ 841 $ (34 ) $ 349,712 $ 28,813 $ 320,899 $ 6,427
Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity	The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands): As of April 30, 2016 Amortized Cost Fair Value Due within one year $ 64,414 $ 64,456 Due in one to five years 255,678 256,443 Total $ 320,092 $ 320,899
Schedule of Gross Unrealized Losses and Fair Values for Investments that were in Continuous Unrealized Loss Position for Less Than 12 Months, Aggregated by Investments Category	The following table presents gross unrealized losses and fair values for those investments that were in a continuous unrealized loss position for less than 12 months as of April 30, 2016, aggregated by investment category (in thousands): Less than 12 months Fair Value Unrealized Loss U.S. government notes $ 28,883 $ (6 ) U.S. government agencies 2,995 (1 ) Corporate debt securities 25,213 (27 ) Total $ 57,091 $ (34 )

Balance Sheet Components (Table

Balance Sheet Components (Tables)	3 Months Ended
	Apr. 30, 2016
Balance Sheet Components Disclosure [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net, consists of the following (in thousands): As 2016 As of April 30, 2016 Test equipment $ 65,663 $ 83,384 Computer, equipment and software 31,388 40,442 Furniture and fixtures 2,852 3,532 Leasehold improvements 4,935 6,055 Total property and equipment 104,838 133,413 Less: accumulated depreciation and amortization (52,209 ) (62,158 ) Property and equipment, net $ 52,629 $ 71,255
Schedule of Intangible Assets, Net	Intangible assets, net, consist of the following (in thousands): As of January 31, 2016 As of April 30, 2016 Technology patents $ 9,125 $ 9,125 Accumulated amortization (2,145 ) (2,471 ) Intangible assets, net $ 6,980 $ 6,654
Schedule of Expected Amortization Expenses for Intangible Assets	As of April 30, 2016, expected amortization expense for intangible assets for each of the next five years and thereafter is as follows (in thousands): Fiscal Years Ending January 31, Estimated Future Amortization Expense Remainder of 2017 $ 978 2018 1,304 2019 1,304 2020 1,304 2021 1,304 Thereafter 460 Total $ 6,654
Schedule of Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consist of the following (in thousands): As of January 31, 2016 As of April 30, 2016 Sales and use tax payable $ 299 $ 151 Accrued professional fees 3,044 2,777 Accrued marketing 2,684 3,804 Accrued travel and entertainment expenses 2,182 2,458 Income tax payable 1,791 1,292 Other accrued liabilities 4,076 5,488 Total accrued expenses and other liabilities $ 14,076 $ 15,970

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	3 Months Ended
	Apr. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity Under Equity Incentive Plans and Related Information	A summary of activity under our equity incentive plans and related information is as follows: Options Outstanding Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Life (In Years) Aggregate Intrinsic Value (in thousands) Balance as of January 31, 2016 68,879,087 $ 6.43 7.9 $ 505,131 Options granted 1,891,000 12.75 Options exercised (2,181,055 ) 1.40 Options cancelled (691,251 ) 11.27 Balance as of April 30, 2016 67,897,781 $ 6.72 7.7 $ 562,758 Vested and exercisable as of April 30, 2016 25,495,004 $ 2.64 6.6 $ 304,484 Vested and expected to vest as of April 30, 2016 65,641,943 $ 6.64 7.7 $ 549,018
Summary of Restricted Stock Unit Activity Under 2015 Plan	A summary of the restricted stock unit activity under our 2015 Plan and related information is as follows: Number of Restricted Stock Units Outstanding Weighted- Average Grant Date Fair Value Unvested balance as of January 31, 2016 53,000 $ 16.98 Granted 4,334,600 14.27 Vested — — Forfeited / cancelled (10,500 ) 13.91 Unvested balance as of April 30, 2016 4,377,100 $ 14.30 Expected to vest as of April 30, 2016 4,144,238 $ 14.30
Summarizes the Components of Stock-Based Compensation	The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands): Three Months Ended April 30, 2015 2016 Cost of revenue—product $ 56 $ 102 Cost of revenue—support 333 1,051 Research and development 3,625 11,220 Sales and marketing 3,444 7,237 General and administrative 1,401 2,524 Total stock-based compensation expense $ 8,859 $ 22,134

Net Loss per Share Attributab23

Net Loss per Share Attributable to Common Stockholders (Tables)	3 Months Ended
	Apr. 30, 2016
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders	The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data): Three Months Ended April 30, 2015 2016 Net loss $ (49,120 ) $ (63,459 ) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 32,605 189,283 Net loss per share attributable to common stockholders, basic and diluted $ (1.51 ) $ (0.34 )
Summary of Weighted-average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders	The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive (in thousands): Three Months Ended April 30, 2015 2016 Convertible preferred stock (on an if-converted basis) 122,281 — Stock options to purchase common stock 55,325 68,407 Restricted stock units — 1,375 Early exercised stock options 4,406 2,666 Employee stock purchase plan — 364 Total 182,012 72,812

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Apr. 30, 2016
Segment Reporting [Abstract]
Schedule of Revenue by Geographic Area	The following table sets forth revenue by geographic area based on the billing address of our customers (in thousands, unaudited): Three Months Ended April 30, 2015 2016 United States $ 58,674 $ 111,227 Rest of the world 15,403 28,720 Total revenue $ 74,077 $ 139,947
Schedule of Long-Lived Assets by Geographic Area	Long-lived assets by geographic area are summarized as follows (in thousands, unaudited): As 2016 As of April 30, 2016 United States $ 50,501 $ 68,058 Rest of the world 2,128 3,197 Total long-lived assets $ 52,629 $ 71,255

Basis of Presentation and Sum25

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Jan. 31, 2016
Accounting Policies [Abstract]
Restricted cash	$ 6,427		$ 7,132
Deferred commissions, current	12,136		15,703
Deferred income taxes, non-current	13,700		$ 14,300
Sales commission expenses	$ 17,600	$ 8,900

Financial Instruments - Summary

Financial Instruments - Summary of Cash Equivalents, Marketable Securities and Restricted Cash by Significant Investment Categories (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 348,905	$ 52,746
Gross Unrealized Gains	841	0
Gross Unrealized Losses	(34)	0
Fair Value	349,712	52,746
Cash Equivalents	28,813	45,614
Marketable Securities	320,899	0
Restricted Cash	6,427	7,132
Money Market Funds | Level 1
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		45,614
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		45,614
Cash Equivalents		45,614
Restricted Cash		0
Certificate of Deposit | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		7,132
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		7,132
Cash Equivalents		0
Restricted Cash		$ 7,132
U.S. Government Notes | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	130,516
Gross Unrealized Gains	63
Gross Unrealized Losses	(6)
Fair Value	130,573
Cash Equivalents	28,813
Marketable Securities	101,760
Restricted Cash	0
U.S. Government Agencies | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	31,969
Gross Unrealized Gains	21
Gross Unrealized Losses	(1)
Fair Value	31,989
Cash Equivalents	0
Marketable Securities	31,989
Restricted Cash	0
Corporate Debt Securities | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	184,677
Gross Unrealized Gains	752
Gross Unrealized Losses	(27)
Fair Value	185,402
Cash Equivalents	0
Marketable Securities	185,402
Restricted Cash	0
Foreign Government Bonds | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,743
Gross Unrealized Gains	5
Gross Unrealized Losses	0
Fair Value	1,748
Cash Equivalents	0
Marketable Securities	1,748
Restricted Cash	0
Money Market Accounts | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	0
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	0
Cash Equivalents	0
Marketable Securities	0
Restricted Cash	$ 6,427

Financial Instruments - Schedul

Financial Instruments - Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Details) $ in Thousands	Apr. 30, 2016USD ($)
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Due within one year, amortized cost	$ 64,414
Due in one to five years, amortized cost	255,678
Total, amortized cost	320,092
Due within one year, fair value	64,456
Due in one to five years, fair value	256,443
Total, fair value	$ 320,899

Financial Instruments - Additio

Financial Instruments - Additional Information (Details)	Apr. 30, 2016USD ($)
Investments Debt And Equity Securities [Abstract]
Securities in unrealized loss position for more than 12 months	$ 0

Financial Instruments - Sched29

Financial Instruments - Schedule of Gross Unrealized Losses and Fair Values for Investments that were in Continuous Unrealized Loss Position for Less Than 12 Months, Aggregated by Investments Category (Details) $ in Thousands	Apr. 30, 2016USD ($)
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	$ 57,091
Unrealized Losses of Less Than 12 Months	(34)
U.S. Government Notes
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	28,883
Unrealized Losses of Less Than 12 Months	(6)
U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	2,995
Unrealized Losses of Less Than 12 Months	(1)
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	25,213
Unrealized Losses of Less Than 12 Months	$ (27)

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 133,413	$ 104,838
Less: accumulated depreciation and amortization	(62,158)	(52,209)
Property and equipment, net	71,255	52,629
Test Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, gross	83,384	65,663
Computer, Equipment and Software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	40,442	31,388
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	3,532	2,852
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 6,055	$ 4,935

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Balance Sheet Components Disclosure [Abstract]
Depreciation and amortization	$ 10,100,000	$ 6,200,000
Intangible assets amortization expense	$ 326,000	$ 326,000

Balance Sheet Components - Sc32

Balance Sheet Components - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Finite Lived Intangible Assets [Line Items]
Intangible assets, net	$ 6,654	$ 6,980
Technology Patents
Finite Lived Intangible Assets [Line Items]
Technology patents	9,125	9,125
Accumulated amortization	(2,471)	(2,145)
Intangible assets, net	$ 6,654	$ 6,980

Balance Sheet Components - Sc33

Balance Sheet Components - Schedule of Expected Amortization Expenses for Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Intangible Assets Net Disclosure [Abstract]
Remainder of 2017	$ 978
2,018	1,304
2,019	1,304
2,020	1,304
2,021	1,304
Thereafter	460
Intangible assets, net	$ 6,654	$ 6,980

Balance Sheet Components - Sc34

Balance Sheet Components - Schedule of Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Payables And Accruals [Abstract]
Sales and use tax payable	$ 151	$ 299
Accrued professional fees	2,777	3,044
Accrued marketing	3,804	2,684
Accrued travel and entertainment expenses	2,458	2,182
Income tax payable	1,292	1,791
Other accrued liabilities	5,488	4,076
Total accrued expenses and other liabilities	$ 15,970	$ 14,076

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	Mar. 15, 2016USD ($)	Apr. 30, 2016USD ($)LeaseAgreementPatent	Jan. 31, 2016USD ($)
Commitments And Contingencies [Line Items]
Lease expiration period		2021-06
Number of lease agreements | LeaseAgreement		3
Lease obligations		$ 10,500,000
Outstanding letters of credit		$ 6,400,000	$ 7,100,000
Letter of credit maturity year and month		2023-03
Royalty damages	$ 14,000,000
Loss contingency		$ 0
Maximum
Commitments And Contingencies [Line Items]
Reasonably possible loss contingency		$ 14,000,000
Patent Infringement
Commitments And Contingencies [Line Items]
Patent infringement allegations number | Patent		5

Line of Credit - Additional Inf

Line of Credit - Additional Information (Details) - USD ($)	1 Months Ended
	Aug. 31, 2014	Jan. 31, 2016
Debt Instrument [Line Items]
Line of credit		$ 0
Revolving Line of Credit
Debt Instrument [Line Items]
Line of credit facility, term	2 years
Line of credit facility, maximum borrowing capacity	$ 15,000,000
Percentage of accounts receivable qualifying for revolving credit agreement	80.00%
Revolving Line of Credit | Prime Rate
Debt Instrument [Line Items]
Line of credit facility, interest rate	1.00%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - $ / shares	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015
Class Of Stock [Line Items]
Preferred stock, shares authorized	20,000,000	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	2,250,000,000	2,250,000,000
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares issued	194,124,000	190,509,000
Common stock, shares outstanding	194,124,000	190,509,000
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares issued	66,438,448	28,769,000
Common stock, shares outstanding	66,438,448	28,769,000
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	250,000,000	250,000,000
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares issued	127,685,960	161,740,000
Common stock, shares outstanding	127,685,960	161,740,000

Equity Incentive Plans - Additi

Equity Incentive Plans - Additional Information (Details)	1 Months Ended	3 Months Ended
	Aug. 31, 2015USD ($)shares	Apr. 30, 2016USD ($)Planshares	Apr. 30, 2015USD ($)shares	Apr. 29, 2016$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of equity incentive plans | Plan		2
Stock-based compensation expense		$ 22,134,000	$ 8,859,000
Unrecognized compensation cost, stock options		$ 179,100,000
Unrecognized compensation cost for stock options, weighted-average period		3 years 6 months
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 549,000	$ 440,000
Number of options granted, net of cancellations | shares		780,000	83,000
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost for stock options, weighted-average period		2 years 10 months 24 days
Unrecognized compensation cost		$ 57,500,000
2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity awards of vest expire period		10 years
2015 Equity Incentive Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price as percentage of fair market value of common stock		100.00%
Equity awards of vest period		2 years
2015 Equity Incentive Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity awards of vest period		4 years
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee stock purchase plan offering period	24 months
Stock-based compensation expense		$ 4,200,000
Unrecognized stock-based compensation expense		$ 28,700,000
Modification charge related to the ESPP reset	$ 10,300,000
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing price of stock | $ / shares				$ 14.55
Class A Common Stock | 2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares initially reserved for issuance | shares		27,000,000
Increase in shares reserved by percentage of capital stock		5.00%
Class A Common Stock | 2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price as percentage of fair market value of common stock	85.00%
Shares reserved for future issuance | shares	3,500,000
Payroll deductions percentage	30.00%
Share cap for ESPP at purchase date | shares	3,000
Calendar year gap for ESPP contribution amount	$ 25,000

Equity Incentive Plans - Summar

Equity Incentive Plans - Summary of Activity Under the Equity Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2016	Jan. 31, 2016
Options Outstanding, Number of Shares
Options Outstanding, Number of Shares, Beginning Balance	68,879,087
Options Outstanding, Number of Shares, Options granted	1,891,000
Options Outstanding, Number of Shares, Options exercised	(2,181,055)
Options Outstanding, Number of Shares, Options cancelled	(691,251)
Options Outstanding, Number of Shares, Ending Balance	67,897,781	68,879,087
Options Outstanding, Number of Shares, Vested and exercisable	25,495,004
Options Outstanding, Number of Shares, Vested and expected to vest	65,641,943
Options Outstanding, Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning Balance	$ 6.43
Weighted Average Exercise Price, Options granted	12.75
Weighted Average Exercise Price, Options exercised	1.40
Weighted Average Exercise Price, Options Cancelled	11.27
Weighted Average Exercise Price, Ending Balance	6.72	$ 6.43
Weighted Average Exercise Price, Vested and exercisable	2.64
Weighted Average Exercise Price, Vested and expected to vest	$ 6.64
Options Outstanding, Weighted Average Remaining Contractual Life (Years)
Weighted Average Remaining Contractual Life (Years)	7 years 8 months 12 days	7 years 10 months 24 days
Weighted Average Remaining Contractual Life (Years), Vested and exercisable	6 years 7 months 6 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	7 years 8 months 12 days
Options Outstanding, Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 562,758	$ 505,131
Aggregate Intrinsic Value, Vested and exercisable	304,484
Aggregate Intrinsic Value, Vested and expected to vest	$ 549,018

Equity Incentive Plans - Summ40

Equity Incentive Plans - Summary of Restricted Stock Unit Activity Under 2015 Plan (Details) - Restricted Stock Units	3 Months Ended
	Apr. 30, 2016$ / sharesshares
Number of Restricted Stock Units Outstanding
Number of Restricted Stock Units Outstanding, Unvested, Beginning Balance | shares	53,000
Number of Restricted Stock Units Outstanding, Granted | shares	4,334,600
Number of Restricted Stock Units Outstanding, Vested | shares	0
Number of Restricted Stock Units Outstanding, Forfeited/ cancelled | shares	(10,500)
Number of Restricted Stock Units Outstanding, Unvested, Ending Balance | shares	4,377,100
Number of Restricted Stock Units Outstanding | shares	4,144,238
Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 16.98
Weighted-Average Grant Date Fair Value, Granted | $ / shares	14.27
Weighted-Average Grant Date Fair Value, Vested | $ / shares	0
Weighted-Average Grant Date Fair Value, Forfeited/ cancelled | $ / shares	13.91
Weighted-Average Grant Date Fair Value, Ending Balance | $ / shares	14.30
Weighted-Average Grant Date Fair Value, Expected to Vest | $ / shares	$ 14.30

Equity Incentive Plans - Summ41

Equity Incentive Plans - Summary of Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 22,134	$ 8,859
Cost of Revenue Product
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	102	56
Cost of Revenue Support
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	1,051	333
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	11,220	3,625
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	7,237	3,444
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 2,524	$ 1,401

Net Loss per Share Attributab42

Net Loss per Share Attributable to Common Stockholders - Summary of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Earnings Per Share [Abstract]
Net loss	$ (63,459)	$ (49,120)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	189,283	32,605
Net loss per share attributable to common stockholders, basic and diluted	$ (0.34)	$ (1.51)

Net Loss per Share Attributab43

Net Loss per Share Attributable to Common Stockholders - Summary of Weighted-average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders (Details) - shares shares in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount	72,812	182,012
Convertible preferred stock (on an if-converted basis)
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount	0	122,281
Stock options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount	68,407	55,325
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount	1,375	0
Early exercised stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount	2,666	4,406
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount	364	0

Segment Information - Additiona

Segment Information - Additional Information (Details)	3 Months Ended
	Apr. 30, 2016Segment
Segment Reporting [Abstract]
Number of business activity	1
Number of reportable segments	1

Segment Information - Schedule

Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 139,947	$ 74,077
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	111,227	58,674
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 28,720	$ 15,403

Segment Information - Schedul46

Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 71,255	$ 52,629
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	68,058	50,501
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 3,197	$ 2,128