Pure Storage (PSTG) 10-Q 6 Sep 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2016	Aug. 25, 2016
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
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
Entity Common Stock, Shares Outstanding		72,026,868
Class B Common Stock
Entity Common Stock, Shares Outstanding		124,581,816

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($)	Jul. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 205,818,000	$ 604,742,000
Marketable securities	364,356,000	0
Accounts receivable, net of allowance of $944 and $2,146 as of January 31, 2016 and July 31, 2016	118,532,000	126,324,000
Inventory	22,630,000	20,649,000
Deferred commissions, current	14,023,000	15,703,000
Prepaid expenses and other current assets	20,933,000	20,652,000
Total current assets	746,292,000	788,070,000
Property and equipment, net	78,523,000	52,629,000
Intangible assets, net	7,312,000	6,980,000
Deferred income taxes, non-current	815,000	536,000
Other assets, non-current	29,262,000	22,568,000
Total assets	862,204,000	870,783,000
Current liabilities:
Accounts payable	30,526,000	38,187,000
Accrued compensation and benefits	33,369,000	32,995,000
Accrued expenses and other liabilities	20,464,000	14,076,000
Deferred revenue, current	127,430,000	94,514,000
Liability related to early exercised stock options	4,274,000	4,760,000
Total current liabilities	216,063,000	184,532,000
Deferred revenue, non-current	129,876,000	121,690,000
Other liabilities, non-current	2,209,000	1,207,000
Total liabilities	348,148,000	307,429,000
Commitments and contingencies	0	0
Stockholders’ equity:
Preferred stock, par value of $0.0001 per share— 20,000 shares authorized as of January 31, 2016 and July 31, 2016; no shares issued and outstanding as of January 31, 2016 and July 31, 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 July 31, 2016; 190,509 (Class A 28,769, Class B 161,740) and 196,466 (Class A 71,516, Class B 124,950) shares issued and outstanding as of January 31, 2016 and July 31, 2016	20,000	19,000
Additional paid-in capital	1,193,936,000	1,118,670,000
Accumulated other comprehensive income	852,000	0
Accumulated deficit	(680,752,000)	(555,335,000)
Total stockholders’ equity	514,056,000	563,354,000
Total liabilities and stockholders’ equity	$ 862,204,000	$ 870,783,000

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Accounts receivable, allowance	$ 2,146	$ 944
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	2,250,000,000	2,250,000,000
Common stock, shares issued (in shares)	196,466,000	190,509,000
Common stock, shares outstanding (in shares)	196,466,000	190,509,000
Class A Common Stock
Common stock, par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	71,516,602	28,769,000
Common stock, shares outstanding (in shares)	71,516,602	28,769,000
Class B Common Stock
Common stock, par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	124,949,816	161,740,000
Common stock, shares outstanding (in shares)	124,949,816	161,740,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Revenue:
Product	$ 130,920	$ 71,192	$ 242,658	$ 134,810
Support	32,294	13,469	60,503	23,928
Total revenue	163,214	84,661	303,161	158,738
Cost of revenue:
Product	42,847	27,641	76,893	50,353
Support	14,000	7,497	26,934	14,421
Total cost of revenue	56,847	35,138	103,827	64,774
Gross profit	106,367	49,523	199,334	93,964
Operating expenses:
Research and development	58,635	38,188	111,573	69,870
Sales and marketing	87,583	59,517	170,681	107,844
General and administrative	19,630	15,227	41,211	27,919
Total operating expenses	165,848	112,932	323,465	205,633
Loss from operations	(59,481)	(63,409)	(124,131)	(111,669)
Other income (expense), net	37	(371)	1,319	(1,074)
Loss before provision for income taxes	(59,444)	(63,780)	(122,812)	(112,743)
Provision for income taxes	106	57	526	214
Net loss	$ (59,550)	$ (63,837)	$ (123,338)	$ (112,957)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.31)	$ (1.89)	$ (0.65)	$ (3.41)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	192,730	33,688	191,026	33,154

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (59,550)	$ (63,837)	$ (123,338)	$ (112,957)
Other comprehensive income, net of tax effect:
Change in unrealized net gain on available-for-sale securities	45	0	852	0
Comprehensive loss	$ (59,505)	$ (63,837)	$ (122,486)	$ (112,957)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (123,338)	$ (112,957)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	22,336	14,268
Stock-based compensation expense	50,894	20,659
Other	494	0
Changes in operating assets and liabilities:
Accounts receivable, net	6,589	(21,017)
Inventory	(2,392)	(1,653)
Deferred commissions	1,887	(4,865)
Prepaid expenses and other assets	(809)	(2,634)
Accounts payable	(10,007)	2,417
Accrued compensation and other liabilities	8,687	11,479
Deferred revenue	41,102	49,813
Net cash used in operating activities	(4,557)	(44,490)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(46,118)	(21,823)
Purchase of intangible assets	(1,000)	0
Purchases of marketable securities	(427,968)	0
Sales of marketable securities	59,071	0
Maturities of marketable securities	5,800	0
Net increase in restricted cash	(5,600)	0
Net cash used in investing activities	(415,815)	(21,823)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from exercise of stock options	6,369	3,004
Proceeds from issuance of common stock under employee stock purchase plan	15,079	0
Payments of deferred offering costs	0	(1,116)
Net cash provided by financing activities	21,448	1,888
Net decrease in cash and cash equivalents	(398,924)	(64,425)
Cash and cash equivalents, beginning of period	604,742	192,707
Cash and cash equivalents, end of period	205,818	128,282
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for income taxes	1,827	333
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION
Property and equipment purchased but not yet paid	7,691	1,742
Vesting of early exercised stock options	486	1,096
Unpaid deferred offering costs	$ 0	$ 1,373

Business Overview

Business Overview	6 Months Ended
	Jul. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Overview	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	6 Months Ended
	Jul. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	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-element 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 a vendor credit card program and letters of credit related to our leases. As of January 31, 2016 and July 31, 2016 , we had restricted cash of $7.1 million and $12.7 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 July 31, 2016 , we recorded deferred commissions, current, of $15.7 million and $14.0 million , and deferred commissions, non-current, of $14.3 million and $14.1 million , in other assets, non-current, in the condensed consolidated balance sheets. We recognized sales commission expenses of $9.7 million and $19.6 million during the three months ended July 31, 2015 and 2016 and $18.6 million and $37.2 million during the six months ended July 31, 2015 and 2016. Recently Adopted Accounting Standard In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). We elected to early adopt this standard in the second quarter of fiscal 2017 with February 1, 2016 being the effective date of adoption. Under ASU 2016-09, excess tax benefits and deficiencies are recognized prospectively in our provision for income taxes rather than additional paid-in capital. As a result of the adoption, our provision for income taxes decreased by $535,000 during the three months ended April 30, 2016. Additionally, we have elected to account for forfeitures as they occur rather than estimate expected forfeiture using a modified retrospective transition method. Accordingly, we recorded a cumulative-effect adjustment of $2.1 million to accumulated deficit and an increase of stock-based compensation expense of $864,000 during the three months ended April 30, 2016. The impact to our provision for income taxes and stock-based compensation expense of $535,000 and $864,000 in the quarter ended April 30, 2016 were reflected in our net loss for the six months ended July 31, 2016 . Finally, ASU 2016-09 requires excess tax benefits to be presented as a component of operating cash flows rather than financing cash flows. We elected to adopt this requirement prospectively and accordingly, prior periods have not been adjusted. Excess tax benefits were not material for all periods presented. Recent Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), requiring an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 will supersede nearly all existing revenue recognition guidance under U.S. GAAP when it becomes effective. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers , deferring the effective date for ASU 2014-09 by one year, and thus, the new standard will be effective for us beginning on February 1, 2018 with early adoption permitted on or after February 1, 2017. This standard may be adopted using either the full or modified retrospective methods. We are currently evaluating adoption methods and the impact of this standard on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize all leases with terms in excess of one year on their balance sheet as a right-of-use asset and a lease liability at the commencement date. The new standard also simplifies the accounting for sale and leaseback transactions. The amendments in this update are effective for us beginning on February 1, 2019 and must be adopted using a modified retrospective method for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Early adoption is permitted. We are currently evaluating adoption methods and the impact of this standard on our consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities to require that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statements of operations. The amendments in this update are effective for us beginning on February 1, 2020 with early adoption permitted on or after February 1, 2019. We are currently evaluating the impact of this standard on our consolidated financial statements.

Financial Instruments

Financial Instruments	6 Months Ended
	Jul. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Financial Instruments	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 July 31, 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 July 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ — $ — $ — $ 12,732 Level 2 U.S. government treasury notes 135,581 181 (3 ) 135,759 18,546 117,213 — U.S. government agencies 47,655 41 (6 ) 47,690 4,001 43,689 — Corporate debt securities 200,093 1,146 (15 ) 201,224 401 200,823 — Foreign government bonds 2,624 7 — 2,631 — 2,631 — Total $ 385,953 $ 1,375 $ (24 ) $ 387,304 $ 22,948 $ 364,356 $ 12,732 The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands): As of July 31, 2016 Amortized Cost Fair Value Due within one year $ 78,421 $ 78,470 Due in one to five years 284,585 285,886 Total $ 363,006 $ 364,356 As of July 31, 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 July 31, 2016 were temporary in nature. 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 July 31, 2016 , aggregated by investment category (in thousands): Less than 12 months Fair Value Unrealized Loss U.S. government notes $ 2,002 $ (3 ) U.S. government agencies 6,492 (6 ) Corporate debt securities 13,689 (15 ) Total $ 22,183 $ (24 ) Gross realized gains on sale of marketable securities for the three and six months ended July 31, 2016 were $104,000 and $110,000 , respectively. We reflect these gains as a component of other income (expense), net in the accompanying condensed consolidated statements of operations.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jul. 31, 2016
Balance Sheet Components Disclosure [Abstract]
Balance Sheet Components	Balance Sheet Components Property and Equipment, Net Property and equipment, net, consists of the following (in thousands): As of January 31, 2016 As of July 31, 2016 Test equipment $ 65,663 $ 94,914 Computer, equipment and software 31,388 45,340 Furniture and fixtures 2,852 4,028 Leasehold improvements 4,935 7,839 Total property and equipment 104,838 152,121 Less: accumulated depreciation and amortization (52,209 ) (73,598 ) Property and equipment, net $ 52,629 $ 78,523 Depreciation and amortization expense was $7.2 million and $11.6 million for the three months ended July 31, 2015 and 2016 and $13.4 million and $21.7 million for the six months ended July 31, 2015 and 2016 , respectively. Intangible Assets, Net Intangible assets, net, consist of the following (in thousands): As of January 31, 2016 As of July 31, 2016 Technology patents $ 9,125 $ 10,125 Accumulated amortization (2,145 ) (2,813 ) Intangible assets, net $ 6,980 $ 7,312 During the three months ended July 31, 2016, we acquired a portfolio of technology patents for $1.0 million with an estimated weighted average useful life of 5 years. Intangible assets amortization expense was $326,000 a nd $342,000 for the three months ended July 31, 2015 and 2016 and $652,000 and $668,000 for the six months ended July 31, 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 July 31, 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 $ 752 2018 1,504 2019 1,504 2020 1,504 2021 1,504 Thereafter 544 Total $ 7,312 Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consist of the following (in thousands): As of January 31, 2016 As of July 31, 2016 Sales and use tax payable $ 299 $ 150 Accrued professional fees 3,044 3,214 Accrued marketing 2,684 6,237 Accrued travel and entertainment expenses 2,182 3,223 Income tax payable 1,791 1,285 Other accrued liabilities 4,076 6,355 Total accrued expenses and other liabilities $ 14,076 $ 20,464

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases During the six months ended July 31, 2016, we entered into three office facility lease agreements and an amendment to an existing office facility lease agreement with total additional lease obligations of approximately $39.5 million with lease periods expiring through June 2024. Letters of Credit As of January 31, 2016 and July 31, 2016 , we had outstanding letters of credit in the aggregate amount of $7.1 million and $7.7 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 June 2024. 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. In August 2016, we received summary judgment on EMC’s claims under Massachusetts General Law 93A , and the remainder of our dispositive motions were denied pending resolution at trial. EMC’s dispositive motions are still pending. 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 No. 6,904,556 entitled “Systems and Methods Which Utilize Parity Sets,” U.S. Patent No. 6,915,475 entitled “Data Integrity Management for Data Storage Systems,” U.S. Patent No. 7,373,464 entitled “Efficient Data Storage System” and the related U.S. Patent No. 7,434,015 entitled “Efficient Data Storage System” and U.S. Patent No. 8,375,187 entitled “I/O Scheduling For Flash Drives.” The complaint seeks damages and injunctive and equitable relief, with respect to the FlashArray 400-Series and predecessor products. Prior to trial, EMC dropped U.S. Patent No. 6,915,475 from the suit, and the District Court found, in a summary judgment ruling, that we did not infringe U.S. Patent No. 8,375,187 and did infringe certain claims of U.S. Patent No. 7,434,015, (’015 patent). The remaining two patents and the validity of ‘015 patent went to trial. 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 product, which EMC did not seek permission from the District Court to add to the lawsuit when FlashArray//m was launched in June of 2015. This new complaint seeks damages and injunctive and equitable relief based on the District Court's previous ruling with respect to the '015 patent. The infringement ruling represents a reasonably possible loss contingency under the applicable accounting standards of up to $14.0 million . We believed there were strong grounds to challenge the infringement ruling by the District Court and the validity finding by the jury with respect to the ‘015 patent, and thus we challenged the findings with respect to the ‘015 patent in post-trial motions before the District Court. On September 1, 2016, the District Court ruled that we are entitled to a new trial on the issue of validity of the ‘015 patent in light of U.S. Patent No. 6,889,297 (the Sun patent) and dismissed as moot EMC’s motion for a permanent injunction precluding us from using the deduplication technology of the asserted claims of the ‘015 patent. No date has been set for the new trial. At present, we do not believe it is probable that a loss has been incurred. As a result, we have not recorded any loss contingency on our consolidated balance sheet as of July 31, 2016 . On September 1, 2016, a purported securities class action entitled Ramsay v. Pure Storage, Inc., et al. was filed in the Superior Court of the State of California (San Mateo County) against us and certain of our officers, directors, investors and underwriters. The complaint asserts claims under sections 11, 12 and 15 of the Securities Act of 1933, 15 U.S.C. section 77 related to alleged inaccuracies, omissions, misstatements or misrepresentations in our registration statement filed in connection with our initial public offering. While we have not yet responded to the complaint, we believe there is no merit to the allegations and intend to defend ourselves vigorously. 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 July 31, 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.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jul. 31, 2016
Equity [Abstract]
Stockholders' Equity	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 July 31, 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 July 31, 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 July 31, 2016 , 71,516,602 shares of Class A common stock were issued and outstanding and 124,949,816 shares of Class B common stock were issued and outstanding.

Equity Incentive Plans

Equity Incentive Plans	6 Months Ended
	Jul. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plans	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, non-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 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 increases 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, subject to a reset provision. 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 would terminate immediately following the purchase of ESPP shares on the purchase date immediately preceding the new offering and participants in the terminated ongoing offering would automatically be enrolled in the new offering (ESPP reset). 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. The initial offering period began on October 7, 2015 and ended on March 15, 2016 as our closing stock price on the new offering date of March 16, 2016 was lower than the closing stock price on October 7, 2015 which triggered an ESPP reset. The ESPP reset resulted in a modification charge of approximately $10.6 million which is being recognized over the new 24 -month offering period. During the three and six months ended July 31, 2016 , we recognized $4.3 million and $8.6 million of stock-based compensation expense related to our 2015 ESPP. As of July 31, 2016 , there was $24.9 million of unrecognized stock-based compensation expense 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 1,979,000 12.70 Options exercised (4,258,667 ) 1.57 Options forfeited/cancelled (1,492,727 ) 11.09 Balance as of July 31, 2016 65,106,693 $ 6.83 7.5 $ 432,684 Vested and exercisable as of July 31, 2016 26,456,291 $ 3.16 6.5 $ 254,711 The aggregate intrinsic value of options vested and exercisable as of July 31, 2016 is calculated based on the difference between the exercise price and the closing price of $12.60 of our Class A common stock on July 29, 2016. As of July 31, 2016 , total unrecognized employee compensation cost was $172.7 million , which is expected to be recognized over a weighted-average period of approximately 3.2 years . During the six months ended July 31, 2015 and 2016 , we granted options to purchase 83,000 and 780,000 shares of common stock that vest upon satisfaction of a performance condition. No performance shares were issued during the three months ended July 31, 2015 and 2016 . For those options that management determined it is probable that the performance condition will be satisfied, we recognized stock-based compensation expense of $514,000 and $1.4 million for the three months ended July 31, 2015 and 2016 and $954,000 and $2.0 million for the six months ended July 31, 2015 and 2016 . 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 5,513,900 13.46 Vested (264,648 ) 14.38 Forfeited (134,734 ) 14.51 Unvested Balance as of July 31, 2016 5,167,518 $ 13.42 As of July 31, 2016 , total unrecognized employee compensation cost related to outstanding restricted stock units was $64.2 million , which is expected to be recognized over a weighted-average period of approximately 2.9 years . 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 July 31, Six Months Ended July 31, 2015 2016 2015 2016 Cost of revenue—product $ 40 $ 181 $ 96 $ 287 Cost of revenue—support 521 1,712 854 2,804 Research and development 6,804 13,976 10,429 25,634 Sales and marketing 2,536 8,732 5,980 16,251 General and administrative 1,899 3,295 3,300 5,918 Total stock-based compensation expense $ 11,800 $ 27,896 $ 20,659 $ 50,894

Net Loss per Share Attributable

Net Loss per Share Attributable to Common Stockholders	6 Months Ended
	Jul. 31, 2016
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Common Stockholders	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. 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 July 31, Six Months Ended July 31, 2015 2016 2015 2016 Net loss $ (63,837 ) $ (59,550 ) $ (112,957 ) $ (123,338 ) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 33,688 192,730 33,154 191,026 Net loss per share attributable to common stockholders, basic and diluted $ (1.89 ) $ (0.31 ) $ (3.41 ) $ (0.65 ) 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 July 31, Six Months Ended July 31, 2015 2016 2015 2016 Convertible preferred stock (on an if-converted basis) 122,281 — 122,281 — Stock options to purchase common stock 59,354 65,567 57,358 66,974 Restricted stock units — 4,682 — 3,046 Early exercised stock options 3,837 2,446 4,119 2,555 Employee stock purchase plan — 953 — 953 Total 185,472 73,648 183,758 73,528

Income Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	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 July 31, 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	6 Months Ended
	Jul. 31, 2016
Segment Reporting [Abstract]
Segment Information	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): Three Months Ended July 31, Six Months Ended July 31, 2015 2016 2015 2016 United States $ 65,603 $ 122,103 $ 124,277 $ 233,330 Rest of the world 19,058 41,111 34,461 69,831 Total revenue $ 84,661 $ 163,214 $ 158,738 $ 303,161 Long-lived assets by geographic area are summarized as follows (in thousands): As of January 31, 2016 As of July 31, 2016 United States $ 50,501 $ 75,425 Rest of the world 2,128 3,098 Total long-lived assets $ 52,629 $ 78,523

Basis of Presentation and Sum17

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jul. 31, 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-element 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 a vendor credit card program and letters of credit related to our leases.
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.
Recently Adopted Accounting Standard and Recent Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Standard In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). We elected to early adopt this standard in the second quarter of fiscal 2017 with February 1, 2016 being the effective date of adoption. Under ASU 2016-09, excess tax benefits and deficiencies are recognized prospectively in our provision for income taxes rather than additional paid-in capital. As a result of the adoption, our provision for income taxes decreased by $535,000 during the three months ended April 30, 2016. Additionally, we have elected to account for forfeitures as they occur rather than estimate expected forfeiture using a modified retrospective transition method. Accordingly, we recorded a cumulative-effect adjustment of $2.1 million to accumulated deficit and an increase of stock-based compensation expense of $864,000 during the three months ended April 30, 2016. The impact to our provision for income taxes and stock-based compensation expense of $535,000 and $864,000 in the quarter ended April 30, 2016 were reflected in our net loss for the six months ended July 31, 2016 . Finally, ASU 2016-09 requires excess tax benefits to be presented as a component of operating cash flows rather than financing cash flows. We elected to adopt this requirement prospectively and accordingly, prior periods have not been adjusted. Excess tax benefits were not material for all periods presented. Recent Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), requiring an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 will supersede nearly all existing revenue recognition guidance under U.S. GAAP when it becomes effective. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers , deferring the effective date for ASU 2014-09 by one year, and thus, the new standard will be effective for us beginning on February 1, 2018 with early adoption permitted on or after February 1, 2017. This standard may be adopted using either the full or modified retrospective methods. We are currently evaluating adoption methods and the impact of this standard on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize all leases with terms in excess of one year on their balance sheet as a right-of-use asset and a lease liability at the commencement date. The new standard also simplifies the accounting for sale and leaseback transactions. The amendments in this update are effective for us beginning on February 1, 2019 and must be adopted using a modified retrospective method for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Early adoption is permitted. We are currently evaluating adoption methods and the impact of this standard on our consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities to require that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statements of operations. The amendments in this update are effective for us beginning on February 1, 2020 with early adoption permitted on or after February 1, 2019. We are currently evaluating the impact of this standard on our consolidated financial statements.

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Jul. 31, 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 July 31, 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 July 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ — $ — $ — $ 12,732 Level 2 U.S. government treasury notes 135,581 181 (3 ) 135,759 18,546 117,213 — U.S. government agencies 47,655 41 (6 ) 47,690 4,001 43,689 — Corporate debt securities 200,093 1,146 (15 ) 201,224 401 200,823 — Foreign government bonds 2,624 7 — 2,631 — 2,631 — Total $ 385,953 $ 1,375 $ (24 ) $ 387,304 $ 22,948 $ 364,356 $ 12,732
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 July 31, 2016 Amortized Cost Fair Value Due within one year $ 78,421 $ 78,470 Due in one to five years 284,585 285,886 Total $ 363,006 $ 364,356
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 July 31, 2016 , aggregated by investment category (in thousands): Less than 12 months Fair Value Unrealized Loss U.S. government notes $ 2,002 $ (3 ) U.S. government agencies 6,492 (6 ) Corporate debt securities 13,689 (15 ) Total $ 22,183 $ (24 )

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jul. 31, 2016
Balance Sheet Components Disclosure [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net, consists of the following (in thousands): As of January 31, 2016 As of July 31, 2016 Test equipment $ 65,663 $ 94,914 Computer, equipment and software 31,388 45,340 Furniture and fixtures 2,852 4,028 Leasehold improvements 4,935 7,839 Total property and equipment 104,838 152,121 Less: accumulated depreciation and amortization (52,209 ) (73,598 ) Property and equipment, net $ 52,629 $ 78,523
Schedule of Intangible Assets, Net	Intangible assets, net, consist of the following (in thousands): As of January 31, 2016 As of July 31, 2016 Technology patents $ 9,125 $ 10,125 Accumulated amortization (2,145 ) (2,813 ) Intangible assets, net $ 6,980 $ 7,312
Schedule of Expected Amortization Expenses for Intangible Assets	As of July 31, 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 $ 752 2018 1,504 2019 1,504 2020 1,504 2021 1,504 Thereafter 544 Total $ 7,312
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 July 31, 2016 Sales and use tax payable $ 299 $ 150 Accrued professional fees 3,044 3,214 Accrued marketing 2,684 6,237 Accrued travel and entertainment expenses 2,182 3,223 Income tax payable 1,791 1,285 Other accrued liabilities 4,076 6,355 Total accrued expenses and other liabilities $ 14,076 $ 20,464

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	6 Months Ended
	Jul. 31, 2016
Disclosure of Compensation Related Costs, Share-based 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 1,979,000 12.70 Options exercised (4,258,667 ) 1.57 Options forfeited/cancelled (1,492,727 ) 11.09 Balance as of July 31, 2016 65,106,693 $ 6.83 7.5 $ 432,684 Vested and exercisable as of July 31, 2016 26,456,291 $ 3.16 6.5 $ 254,711
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 5,513,900 13.46 Vested (264,648 ) 14.38 Forfeited (134,734 ) 14.51 Unvested Balance as of July 31, 2016 5,167,518 $ 13.42
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 July 31, Six Months Ended July 31, 2015 2016 2015 2016 Cost of revenue—product $ 40 $ 181 $ 96 $ 287 Cost of revenue—support 521 1,712 854 2,804 Research and development 6,804 13,976 10,429 25,634 Sales and marketing 2,536 8,732 5,980 16,251 General and administrative 1,899 3,295 3,300 5,918 Total stock-based compensation expense $ 11,800 $ 27,896 $ 20,659 $ 50,894

Net Loss per Share Attributab21

Net Loss per Share Attributable to Common Stockholders (Tables)	6 Months Ended
	Jul. 31, 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 July 31, Six Months Ended July 31, 2015 2016 2015 2016 Net loss $ (63,837 ) $ (59,550 ) $ (112,957 ) $ (123,338 ) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 33,688 192,730 33,154 191,026 Net loss per share attributable to common stockholders, basic and diluted $ (1.89 ) $ (0.31 ) $ (3.41 ) $ (0.65 )
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 July 31, Six Months Ended July 31, 2015 2016 2015 2016 Convertible preferred stock (on an if-converted basis) 122,281 — 122,281 — Stock options to purchase common stock 59,354 65,567 57,358 66,974 Restricted stock units — 4,682 — 3,046 Early exercised stock options 3,837 2,446 4,119 2,555 Employee stock purchase plan — 953 — 953 Total 185,472 73,648 183,758 73,528

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jul. 31, 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): Three Months Ended July 31, Six Months Ended July 31, 2015 2016 2015 2016 United States $ 65,603 $ 122,103 $ 124,277 $ 233,330 Rest of the world 19,058 41,111 34,461 69,831 Total revenue $ 84,661 $ 163,214 $ 158,738 $ 303,161
Schedule of Long-Lived Assets by Geographic Area	Long-lived assets by geographic area are summarized as follows (in thousands): As of January 31, 2016 As of July 31, 2016 United States $ 50,501 $ 75,425 Rest of the world 2,128 3,098 Total long-lived assets $ 52,629 $ 78,523

Basis of Presentation and Sum23

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items]
Restricted cash	$ 12,732			$ 12,732		$ 7,132
Deferred commissions, current	14,023			14,023		15,703
Deferred income taxes, non-current	14,100			14,100		14,300
Sales commission expenses	19,600		$ 9,700	37,200	$ 18,600
Decrease in provision for income taxes	106		57	526	214
Accumulated deficit	(680,752)			(680,752)		$ (555,335)
Total stock-based compensation expense	$ 27,896		$ 11,800	50,894	$ 20,659
Accounting Standards Update 2016-09, Forfeiture Rate Component | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncement, Early Adoption [Line Items]
Decrease in provision for income taxes		$ (535)		535
Total stock-based compensation expense		864		$ 864
Accounting Standards Update 2016-09, Forfeiture Rate Component | Accumulated Deficit | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative-effect adjustment, new accounting standard		$ 2,100

Financial Instruments - Summary

Financial Instruments - Summary of Cash Equivalents, Marketable Securities and Restricted Cash by Significant Investment Categories (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 385,953	$ 52,746
Gross Unrealized Gains	1,375	0
Gross Unrealized Losses	(24)	0
Fair Value	387,304	52,746
Cash Equivalents	22,948	45,614
Marketable Securities	364,356	0
Restricted Cash	12,732	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
Money Market Accounts | Level 1
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	12,732
U.S. Government Treasury Notes | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	135,581
Gross Unrealized Gains	181
Gross Unrealized Losses	(3)
Fair Value	135,759
Cash Equivalents	18,546
Marketable Securities	117,213
Restricted Cash	0
U.S. Government Agencies | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	47,655
Gross Unrealized Gains	41
Gross Unrealized Losses	(6)
Fair Value	47,690
Cash Equivalents	4,001
Marketable Securities	43,689
Restricted Cash	0
Corporate Debt Securities | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	200,093
Gross Unrealized Gains	1,146
Gross Unrealized Losses	(15)
Fair Value	201,224
Cash Equivalents	401
Marketable Securities	200,823
Restricted Cash	0
Foreign Government Bonds | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,624
Gross Unrealized Gains	7
Gross Unrealized Losses	0
Fair Value	2,631
Cash Equivalents	0
Marketable Securities	2,631
Restricted Cash	$ 0

Financial Instruments - Schedul

Financial Instruments - Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Details) $ in Thousands	Jul. 31, 2016USD ($)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due within one year, Amortized Cost	$ 78,421
Due in one to five years, Amortized Cost	284,585
Total, Amortized Cost	363,006
Due within one year, Fair Value	78,470
Due in one to five years, Fair Value	285,886
Total, Fair Value	$ 364,356

Financial Instruments - Additio

Financial Instruments - Additional Information (Details)	Jul. 31, 2016USD ($)
Investments, Debt and Equity Securities [Abstract]
Securities in unrealized loss position for more than 12 months	$ 0

Financial Instruments - Sched27

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	3 Months Ended	6 Months Ended
	Jul. 31, 2016USD ($)	Jul. 31, 2016USD ($)
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	$ 22,183	$ 22,183
Unrealized Losses of Less Than 12 Months	(24)	(24)
Gross realized gains, available-for-sale securities	104	110
U.S. Government Notes
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	2,002	2,002
Unrealized Losses of Less Than 12 Months	(3)	(3)
U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	6,492	6,492
Unrealized Losses of Less Than 12 Months	(6)	(6)
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	13,689	13,689
Unrealized Losses of Less Than 12 Months	$ (15)	$ (15)

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment	$ 152,121	$ 104,838
Less: accumulated depreciation and amortization	(73,598)	(52,209)
Property and equipment, net	78,523	52,629
Test equipment
Property Plant And Equipment [Line Items]
Total property and equipment	94,914	65,663
Computer, equipment and software
Property Plant And Equipment [Line Items]
Total property and equipment	45,340	31,388
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	4,028	2,852
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment	$ 7,839	$ 4,935

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Balance Sheet Components Disclosure [Abstract]
Depreciation and amortization	$ 11,600	$ 7,200	$ 21,700	$ 13,400
Intangible assets amortization expense	$ 342	$ 326	$ 668	$ 652

Balance Sheet Components - Sc30

Balance Sheet Components - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jan. 31, 2016
Finite Lived Intangible Assets [Line Items]
Intangible assets, net	$ 7,312	$ 6,980
Technology patents
Finite Lived Intangible Assets [Line Items]
Technology patents	10,125	9,125
Accumulated amortization	(2,813)	(2,145)
Intangible assets, net	7,312	$ 6,980
Acquired technology patents	$ 1,000
Weighted average amortization life	5 years

Balance Sheet Components - Sc31

Balance Sheet Components - Schedule of Expected Amortization Expenses for Intangible Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Intangible Assets Net Disclosure [Abstract]
Remainder of 2017	$ 752
2,018	1,504
2,019	1,504
2,020	1,504
2,021	1,504
Thereafter	544
Intangible assets, net	$ 7,312	$ 6,980

Balance Sheet Components - Sc32

Balance Sheet Components - Schedule of Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Balance Sheet Components Disclosure [Abstract]
Sales and use tax payable	$ 150	$ 299
Accrued professional fees	3,214	3,044
Accrued marketing	6,237	2,684
Accrued travel and entertainment expenses	3,223	2,182
Income tax payable	1,285	1,791
Other accrued liabilities	6,355	4,076
Total accrued expenses and other liabilities	$ 20,464	$ 14,076

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	Mar. 15, 2016USD ($)	Nov. 26, 2013patent	Jul. 31, 2016USD ($)lease_agreement	Jan. 31, 2016USD ($)
Commitments And Contingencies [Line Items]
Outstanding letters of credit			$ 7,700,000	$ 7,100,000
Royalty damages	$ 14,000,000
Maximum
Commitments And Contingencies [Line Items]
Reasonably possible loss contingency (up to)			$ 14,000,000
Patent Infringement
Commitments And Contingencies [Line Items]
Patent infringement allegations number of patents | patent		5
Patent infringement allegations number of patents which went to trial | patent		2
Office Facility Leases
Commitments And Contingencies [Line Items]
Number of lease agreements | lease_agreement			3
Total operating lease obligations			$ 39,500,000

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details)	Jul. 31, 2016class$ / sharesshares	Jan. 31, 2016$ / sharesshares	Oct. 31, 2015shares
Class Of Stock [Line Items]
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Number of classes of stock | class	2
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	2,250,000,000	2,250,000,000
Common stock, par value per share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	196,466,000	190,509,000
Common stock, shares outstanding (in shares)	196,466,000	190,509,000
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, par value per share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	71,516,602	28,769,000
Common stock, shares outstanding (in shares)	71,516,602	28,769,000
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, par value per share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	124,949,816	161,740,000
Common stock, shares outstanding (in shares)	124,949,816	161,740,000

Equity Incentive Plans - Additi

Equity Incentive Plans - Additional Information (Details)	Mar. 16, 2016USD ($)	Aug. 31, 2015USD ($)periodshares	Jul. 31, 2016USD ($)shares	Jul. 31, 2015USD ($)	Jul. 31, 2016USD ($)planshares	Jul. 31, 2015USD ($)shares	Jul. 29, 2016$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of equity incentive plans | plan					2
Total stock-based compensation expense			$ 27,896,000	$ 11,800,000	$ 50,894,000	$ 20,659,000
Unrecognized compensation cost, stock options			172,700,000		$ 172,700,000
Unrecognized compensation cost for stock options, weighted-average period					3 years 2 months
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense			$ 1,400,000	$ 514,000	$ 2,000,000	$ 954,000
Number of options granted, net of cancellations (in shares) | 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 11 months
Unrecognized compensation cost			$ 64,200,000		$ 64,200,000
2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity awards of vest expire period (no later than)					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]
Number of purchase periods | period		4
Purchase period, term		6 months
Modification charge related to the ESPP reset	$ 10,600,000
Employee stock purchase plan offering period	24 months
Total stock-based compensation expense			$ 4,300,000		$ 8,600,000
Unrecognized stock-based compensation expense			$ 24,900,000		$ 24,900,000
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing price of stock (in dollars per share) | $ / shares							$ 12.60
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		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 (in shares) | shares		3,500,000
Payroll deductions percentage		30.00%
Share cap for ESPP at purchase date (in shares) | 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	6 Months Ended	12 Months Ended
	Jul. 31, 2016	Jul. 31, 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		1,979,000
Options Outstanding, Number of Shares, Options exercised		(4,258,667)
Options Outstanding, Number of Shares, Options forfeited/cancelled		(1,492,727)
Options Outstanding, Number of Shares, Ending balance	65,106,693	65,106,693	68,879,087
Options Outstanding, Number of Shares, Vested and exercisable	26,456,291	26,456,291
Options Outstanding, Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance (in dollars per share)		$ 6.43
Weighted Average Exercise Price, Options granted (in dollars per share)		12.70
Weighted Average Exercise Price, Options exercised (in dollars per share)		1.57
Weighted Average Exercise Price, Options forfeited/cancelled (in dollars per share)		11.09
Weighted Average Exercise Price, Ending balance (in dollars per share)	$ 6.83	6.83	$ 6.43
Weighted Average Exercise Price, Vested and exercisable (in dollars per share)	$ 3.16	$ 3.16
Weighted Average Remaining Contractual Life (Years)	7 years 6 months		7 years 11 months
Weighted Average Remaining Contractual Life (Years), Vested and exercisable	6 years 6 months
Aggregate Intrinsic Value	$ 432,684	$ 432,684	$ 505,131
Aggregate Intrinsic Value, Vested and exercisable	$ 254,711	$ 254,711

Equity Incentive Plans - Summ37

Equity Incentive Plans - Summary of Restricted Stock Unit Activity Under 2015 Plan (Details) - Restricted Stock Units	6 Months Ended
	Jul. 31, 2016$ / sharesshares
Number of Restricted Stock Units Outstanding
Number of Restricted Stock Units Outstanding, Unvested, Beginning balance (in shares) | shares	53,000
Number of Restricted Stock Units Outstanding, Granted (in shares) | shares	5,513,900
Number of Restricted Stock Units Outstanding, Vested (in shares) | shares	(264,648)
Number of Restricted Stock Units Outstanding, Forfeited (in shares) | shares	(134,734)
Number of Restricted Stock Units Outstanding, Unvested, Ending balance (in shares) | shares	5,167,518
Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares	$ 16.98
Weighted-Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	13.46
Weighted-Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	14.38
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	14.51
Weighted-Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares	$ 13.42

Equity Incentive Plans - Summ38

Equity Incentive Plans - Summary of Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 27,896	$ 11,800	$ 50,894	$ 20,659
Cost of revenue—product
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	181	40	287	96
Cost of revenue—support
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	1,712	521	2,804	854
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	13,976	6,804	25,634	10,429
Sales and marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	8,732	2,536	16,251	5,980
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 3,295	$ 1,899	$ 5,918	$ 3,300

Net Loss per Share Attributab39

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		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Earnings Per Share [Abstract]
Net loss	$ (59,550)	$ (63,837)	$ (123,338)	$ (112,957)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	192,730	33,688	191,026	33,154
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.31)	$ (1.89)	$ (0.65)	$ (3.41)

Net Loss per Share Attributab40

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		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	73,648	185,472	73,528	183,758
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 (in shares)	65,567	59,354	66,974	57,358
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 (in shares)	4,682	0	3,046	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 (in shares)	2,446	3,837	2,555	4,119
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 (in shares)	953	0	953	0
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 (in shares)	0	122,281	0	122,281

Segment Information - Additiona

Segment Information - Additional Information (Details) - segment	3 Months Ended	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2016
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		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 163,214	$ 84,661	$ 303,161	$ 158,738
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	122,103	65,603	233,330	124,277
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 41,111	$ 19,058	$ 69,831	$ 34,461

Segment Information - Schedul43

Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 78,523	$ 52,629
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	75,425	50,501
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 3,098	$ 2,128