Pure Storage (PSTG) 10-Q 13 Dec 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Oct. 31, 2016	Dec. 06, 2016
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
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		82,493,782
Class B Common Stock
Entity Common Stock, Shares Outstanding		117,381,478

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 152,461	$ 604,742
Marketable securities	365,785	0
Accounts receivable, net of allowance of $944 and $2,414 as of January 31, 2016 and October 31, 2016	163,038	126,324
Inventory	20,112	20,649
Deferred commissions, current	14,298	15,703
Prepaid expenses and other current assets	18,756	20,652
Total current assets	734,450	788,070
Property and equipment, net	82,088	52,629
Intangible assets, net	6,936	6,980
Deferred income taxes, non-current	1,074	536
Other assets, non-current	29,588	22,568
Total assets	854,136	870,783
Current liabilities:
Accounts payable	43,412	38,187
Accrued compensation and benefits	29,137	32,995
Accrued expenses and other liabilities	20,545	14,076
Deferred revenue, current	134,536	94,514
Liability related to early exercised stock options	3,967	4,760
Total current liabilities	231,597	184,532
Deferred revenue, non-current	141,849	121,690
Other liabilities, non-current	2,925	1,207
Total liabilities	376,371	307,429
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 October 31, 2016; no shares issued and outstanding as of January 31, 2016 and October 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 October 31, 2016; 190,509 (Class A 28,769, Class B 161,740) and 199,678 (Class A 75,320, Class B 124,358) shares issued and outstanding as of January 31, 2016 and October 31, 2016	20	19
Additional paid-in capital	1,237,012	1,118,670
Accumulated other comprehensive income	298	0
Accumulated deficit	(759,565)	(555,335)
Total stockholders’ equity	477,765	563,354
Total liabilities and stockholders’ equity	$ 854,136	$ 870,783

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Accounts receivable, allowance	$ 2,414	$ 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)	199,678,000	190,509,000
Common stock, shares outstanding (in shares)	199,678,000	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)	75,319,966	28,769,000
Common stock, shares outstanding (in shares)	75,319,966	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)	124,357,633	161,740,000
Common stock, shares outstanding (in shares)	124,357,633	161,740,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Revenue:
Product	$ 160,523	$ 113,573	$ 403,181	$ 248,383
Support	36,433	17,791	96,936	41,719
Total revenue	196,956	131,364	500,117	290,102
Cost of revenue:
Product	54,725	41,995	131,618	92,348
Support	14,597	9,058	41,531	23,479
Total cost of revenue	69,322	51,053	173,149	115,827
Gross profit	127,634	80,311	326,968	174,275
Operating expenses:
Research and development	61,612	43,065	173,185	112,935
Sales and marketing	91,392	63,803	262,073	171,647
General and administrative	22,810	29,022	64,021	56,941
Legal settlement	30,000	0	30,000	0
Total operating expenses	205,814	135,890	529,279	341,523
Loss from operations	(78,180)	(55,579)	(202,311)	(167,248)
Other income (expense), net	(192)	(171)	1,127	(1,245)
Loss before provision for income taxes	(78,372)	(55,750)	(201,184)	(168,493)
Provision for income taxes	441	751	967	965
Net loss	$ (78,813)	$ (56,501)	$ (202,151)	$ (169,458)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.40)	$ (0.76)	$ (1.05)	$ (3.60)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	195,807	74,565	192,637	47,109

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (78,813)	$ (56,501)	$ (202,151)	$ (169,458)
Other comprehensive income, net of tax effect:
Change in unrealized net gain on available-for-sale securities	(554)	0	298	0
Comprehensive loss	$ (79,367)	$ (56,501)	$ (201,853)	$ (169,458)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (202,151)	$ (169,458)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	35,978	23,118
Stock-based compensation expense	79,129	36,198
Contribution of common stock to Pure Good Foundation	0	11,900
Other	1,051	0
Changes in operating assets and liabilities:
Accounts receivable, net	(38,186)	(53,094)
Inventory	(189)	(3,420)
Deferred commissions	1,844	(8,472)
Prepaid expenses and other assets	39	(2,065)
Accounts payable	3,639	10,224
Accrued compensation and other liabilities	6,786	17,216
Deferred revenue	60,180	87,987
Net cash used in operating activities	(51,880)	(49,866)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(64,602)	(29,495)
Purchase of intangible assets	(1,000)	0
Purchases of marketable securities	(483,558)	0
Sales of marketable securities	79,815	0
Maturities of marketable securities	38,213	0
Net increase in restricted cash	(5,600)	(2,484)
Net cash used in investing activities	(436,732)	(31,979)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from initial public offering, net	0	459,425
Net proceeds from exercise of stock options	10,725	4,710
Proceeds from issuance of common stock under employee stock purchase plan	25,606	0
Payments of deferred offering costs	0	(1,690)
Net cash provided by financing activities	36,331	462,445
Net increase (decrease) in cash and cash equivalents	(452,281)	380,600
Cash and cash equivalents, beginning of period	604,742	192,707
Cash and cash equivalents, end of period	152,461	573,307
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for income taxes	2,510	820
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION
Conversion of convertible preferred stock to common stock upon initial public offering	0	543,940
Property and equipment purchased but not yet paid	5,956	1,750
Vesting of early exercised stock options	794	1,543
Unpaid deferred offering costs	$ 0	$ 2,748

Business Overview

Business Overview	9 Months Ended
	Oct. 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	9 Months Ended
	Oct. 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 October 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 October 31, 2016 , we recorded deferred commissions, current, of $15.7 million and $14.3 million , and deferred commissions, non-current, of $14.3 million and $13.8 million , in other assets, non-current, in the condensed consolidated balance sheets. We recognized sales commission expenses of $16.5 million and $21.6 million during the three months ended October 31, 2015 and 2016 and $38.6 million and $58.8 million during the nine months ended October 31, 2015 and 2016. Revenue Recognition We derive revenue from two sources: (1) product revenue which includes hardware and embedded software and (2) support revenue which includes customer support, hardware maintenance and software upgrades on a when-and-if-available basis. Most of our arrangements, other than stand-alone renewals of maintenance and support agreements, are multiple-element arrangements with a combination of product and support related deliverables (as defined above). Under multiple-element arrangements, we allocate consideration at the inception of an arrangement to all deliverables based on the relative selling price method in accordance with the hierarchy provided by the multiple-element arrangement accounting guidance, which includes (i) vendor-specific objective evidence (“VSOE”), of selling price, if available; (ii) third-party evidence (“TPE”), of selling price, if VSOE is not available; and (iii) best estimate of selling price (“BESP”), if neither VSOE nor TPE is available. We determine VSOE based on our historical pricing and discounting practices for the specific products and services when sold separately. In determining VSOE, we require that a substantial majority of the stand-alone selling prices fall within a reasonably narrow pricing range. During the three months ended October 31, 2016, we established VSOE for support related deliverables as our stand-alone selling prices are now sufficiently concentrated based on an analysis of our historical data. As we have not established VSOE for any of our other deliverables and TPE cannot be obtained as our products contain a significant element of proprietary technology and our solutions offer substantially different features and functionality and hence are not comparable, we allocate consideration to all other deliverables based on BESP. 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 $921,000 during the nine months ended October 31, 2016 . Additionally, we 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. 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 will be 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 will be 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. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16), which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. ASU 2016-16 will be effective for us beginning on February 1, 2018 and will be applied on a modified retrospective basis. Early adoption is permitted. We do not expect the adoption of this standard to have any impact on our consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18), which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU 2016-18 will be effective for us beginning on February 1, 2018 and will be applied on a retrospective basis. Early adoption is permitted. We are currently evaluating the impact of this standard on our consolidated financial statements.

Financial Instruments

Financial Instruments	9 Months Ended
	Oct. 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 October 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 October 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ — $ — $ — $ 12,734 Level 2 U.S. government treasury notes 143,532 67 (27 ) 143,572 14,949 128,623 — U.S. government agencies 41,161 13 (55 ) 41,119 — 41,119 — Corporate debt securities 192,944 581 (110 ) 193,415 — 193,415 — Foreign government bonds 2,625 3 — 2,628 — 2,628 — Total $ 380,262 $ 664 $ (192 ) $ 380,734 $ 14,949 $ 365,785 $ 12,734 The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands): As of October 31, 2016 Amortized Cost Fair Value Due within one year $ 95,602 $ 95,673 Due in one to five years 269,711 270,112 Total $ 365,313 $ 365,785 As of October 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 October 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 October 31, 2016 , aggregated by investment category (in thousands): Less than 12 months Fair Value Unrealized Loss U.S. government treasury notes $ 35,647 $ (27 ) U.S. government agencies 28,274 (55 ) Corporate debt securities 47,483 (110 ) Total $ 111,404 $ (192 ) Gross realized gains on sale of marketable securities for the three and nine months ended October 31, 2016 were $65,000 and $175,000 , respectively.

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Oct. 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 As of Test equipment $ 65,663 $ 103,491 Computer, equipment and software 31,388 50,235 Furniture and fixtures 2,852 4,072 Leasehold improvements 4,935 9,902 Total property and equipment 104,838 167,700 Less: accumulated depreciation and amortization (52,209 ) (85,612 ) Property and equipment, net $ 52,629 $ 82,088 Depreciation and amortization expense was $8.5 million and $13.2 million for the three months ended October 31, 2015 and 2016 and $22.1 million and $34.9 million for the nine months ended October 31, 2015 and 2016 , respectively. Intangible Assets, Net Intangible assets, net, consist of the following (in thousands): As of As of Technology patents $ 9,125 $ 10,125 Accumulated amortization (2,145 ) (3,189 ) Intangible assets, net $ 6,980 $ 6,936 Intangible assets amortization expense was $326,000 a nd $376,000 for the three months ended October 31, 2015 and 2016 and $978,000 and $1.0 million for the nine months ended October 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 October 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 $ 376 2018 1,504 2019 1,504 2020 1,504 2021 1,504 Thereafter 544 Total $ 6,936 Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consist of the following (in thousands): As of January 31, 2016 As of October 31, 2016 Sales and use tax payable $ 299 $ 406 Accrued professional fees 3,044 3,256 Accrued marketing 2,684 6,908 Accrued travel and entertainment expenses 2,182 2,977 Income tax payable 1,791 974 Other accrued liabilities 4,076 6,024 Total accrued expenses and other liabilities $ 14,076 $ 20,545

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases During the nine months ended October 31, 2016, we entered into four office facility lease agreements and an amendment to an existing office facility lease agreement with total additional lease obligations of approximately $43.7 million with lease periods expiring through June 2024. Letters of Credit As of January 31, 2016 and October 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 misappropriation of confidential information and trade secrets and unlawful interference with business and contractual relationships. The complaint sought damages and injunctive relief. On November 26, 2013 and November 18, 2014, we counterclaimed, alleging, among other things, misappropriation of trade secrets, unlawful interference with contractual and business relationships, unfair competition, commercial disparagement, and defamation. Our counterclaim sought damages and declaratory and injunctive relief. In separate litigation matters, on November 26, 2013 and March 21, 2016, EMC filed complaints against us in the U.S. District Court for the District of Delaware, alleging patent infringement. The complaints sought damages and injunctive and equitable relief. On October 18, 2016, we entered into an agreement with Dell Inc. (Dell), as successor-in-interest to EMC to settle all litigation between EMC and us. The terms of the settlement include a payment to Dell, the dismissal of all litigation between the parties, mutual releases, and a license to the disputed patent. Accordingly, we paid Dell a one-time settlement amount of $30.0 million , and all litigation between EMC and us was dismissed prior to October 31, 2016. Settlement discussions started subsequent to the filing of our Quarterly Report on Form 10-Q for the three months ended July 31, 2016. We evaluated the settlement as a multiple-element arrangement, which requires us to allocate the one-time payment to the identifiable elements based on their relative fair values. Based on our estimates of fair value, we determined that the sole benefit of the settlement is to avoid further litigation costs with no value attributable to future use or benefit. Accordingly, we recorded the $30.0 million as a legal settlement charge in general and administrative expenses during the three months ended October 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 for our initial public offering, asserting claims under sections 11, 12 and 15 of the Securities Act of 1933 on behalf of a purported class consisting of purchasers of our common stock pursuant or traceable to our initial public offering, and seeking unspecified compensatory damages and other relief. Substantially identical lawsuits were subsequently filed in the same court, bringing the same claims against the same defendants, captioned Peter Galanis v. Pure Storage, Inc., et al. (filed September 14, 2016), Curtis Wilson v. Pure Storage, Inc., et al. (filed September 15, 2016), Loren Moe v. Pure Storage, Inc., et al. (filed September 23, 2016), and Mason Delahooke and Mahsa Shirazikia v. Pure Storage, Inc., et al. (filed October 5, 2016). On October 27, 2016, the aforementioned actions were consolidated under the caption In re Pure Storage, Inc. Shareholder Litigation . We expect that the plaintiffs will file a consolidated complaint on December 13, 2016. 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 October 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	9 Months Ended
	Oct. 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 October 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 October 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 October 31, 2016 , 75,319,966 shares of Class A common stock were issued and outstanding and 124,357,633 shares of Class B common stock were issued and outstanding.

Equity Incentive Plans

Equity Incentive Plans	9 Months Ended
	Oct. 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. 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 number of shares reserved for issuance under our 2015 ESPP increases automatically on the first day of February of each of 2016 through 2025, in an amount equal to the lesser of (i) 1% of the total number of shares of our capital stock outstanding as of the immediately preceding January 31, and (ii) 3,500,000 shares of Class A common stock. 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 ending March 15, 2018. We recognized stock-based compensation related to our 2015 ESPP of $907,000 and $4.8 million during the three months ended October 31, 2015 and 2016 and $907,000 and $13.4 million during the nine months ended October 31, 2015 and 2016 . As of October 31, 2016 , there was $27.2 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 stock option 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 1,999,000 12.69 Options exercised (6,111,682 ) 1.75 Options forfeited/cancelled (2,196,344 ) 11.67 Balance as of October 31, 2016 62,570,061 $ 6.90 7.3 $ 400,802 Vested and exercisable as of October 31, 2016 27,652,418 $ 3.59 6.4 $ 250,249 The aggregate intrinsic value of options vested and exercisable as of October 31, 2016 is calculated based on the difference between the exercise price and the closing price of $12.34 of our Class A common stock on October 31, 2016 . As of October 31, 2016 , total unrecognized employee compensation cost related to outstanding options was $153.3 million , which is expected to be recognized over a weighted-average period of approximately 3.1 years . During the three months ended October 31, 2015 and nine months ended October 31, 2015 and 2016 , we granted options to purchase 50,000 , 133,000 and 780,000 shares of common stock that vest upon satisfaction of a performance condition. No performance options were granted during the three months ended October 31, 2016 . For those options that management determined it is probable that the performance condition will be satisfied, we recognized stock-based compensation expense of $797,000 and $193,000 for the three months ended October 31, 2015 and 2016 and $1.8 million and $2.2 million for the nine months ended October 31, 2015 and 2016 . In November 2016, we modified certain employee stock option awards to accelerate the vesting, contingent, in part, on certain conditions. This modification is expected to result in stock-based compensation expense of $5.9 million to be recognized during the three months ended January 31, 2017. 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 8,906,750 13.36 Vested (622,500 ) 14.13 Forfeited (309,878 ) 13.69 Unvested Balance as of October 31, 2016 8,027,372 $ 13.32 As of October 31, 2016 , total unrecognized employee compensation cost related to outstanding restricted stock units was $98.1 million , which is expected to be recognized over a weighted-average period of approximately 2.8 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 Nine Months Ended 2015 2016 2015 2016 Cost of revenue—product $ 43 $ 138 $ 139 $ 425 Cost of revenue—support 657 1,178 1,511 3,982 Research and development 8,195 15,241 18,624 40,875 Sales and marketing 4,559 8,468 10,539 24,719 General and administrative 2,085 3,210 5,385 9,128 Total stock-based compensation expense $ 15,539 $ 28,235 $ 36,198 $ 79,129

Net Loss per Share Attributable

Net Loss per Share Attributable to Common Stockholders	9 Months Ended
	Oct. 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 Nine Months Ended 2015 2016 2015 2016 Net loss $ (56,501 ) $ (78,813 ) $ (169,458 ) $ (202,151 ) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 74,565 195,807 47,109 192,637 Net loss per share attributable to common stockholders, basic and diluted $ (0.76 ) $ (0.40 ) $ (3.60 ) $ (1.05 ) 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 Nine Months Ended 2015 2016 2015 2016 Stock options to purchase common stock 63,738 62,874 59,611 65,594 Restricted stock units — 6,342 — 4,155 Early exercised stock options 3,318 2,246 3,849 2,451 Employee stock purchase plan — 434 — 434 Total 67,056 71,896 63,460 72,634

Income Taxes

Income Taxes	9 Months Ended
	Oct. 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 October 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	9 Months Ended
	Oct. 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 Nine Months Ended 2015 2016 2015 2016 United States $ 105,615 $ 152,134 $ 229,892 $ 385,464 Rest of the world 25,749 44,822 60,210 114,653 Total revenue $ 131,364 $ 196,956 $ 290,102 $ 500,117 Long-lived assets by geographic area are summarized as follows (in thousands): As of As of United States $ 50,501 $ 78,952 Rest of the world 2,128 3,136 Total long-lived assets $ 52,629 $ 82,088

Basis of Presentation and Sum17

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 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.
Revenue Recognition	Revenue Recognition We derive revenue from two sources: (1) product revenue which includes hardware and embedded software and (2) support revenue which includes customer support, hardware maintenance and software upgrades on a when-and-if-available basis. Most of our arrangements, other than stand-alone renewals of maintenance and support agreements, are multiple-element arrangements with a combination of product and support related deliverables (as defined above). Under multiple-element arrangements, we allocate consideration at the inception of an arrangement to all deliverables based on the relative selling price method in accordance with the hierarchy provided by the multiple-element arrangement accounting guidance, which includes (i) vendor-specific objective evidence (“VSOE”), of selling price, if available; (ii) third-party evidence (“TPE”), of selling price, if VSOE is not available; and (iii) best estimate of selling price (“BESP”), if neither VSOE nor TPE is available. We determine VSOE based on our historical pricing and discounting practices for the specific products and services when sold separately. In determining VSOE, we require that a substantial majority of the stand-alone selling prices fall within a reasonably narrow pricing range. During the three months ended October 31, 2016, we established VSOE for support related deliverables as our stand-alone selling prices are now sufficiently concentrated based on an analysis of our historical data. As we have not established VSOE for any of our other deliverables and TPE cannot be obtained as our products contain a significant element of proprietary technology and our solutions offer substantially different features and functionality and hence are not comparable, we allocate consideration to all other deliverables based on BESP.
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 $921,000 during the nine months ended October 31, 2016 . Additionally, we 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. 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 will be 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 will be 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. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16), which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. ASU 2016-16 will be effective for us beginning on February 1, 2018 and will be applied on a modified retrospective basis. Early adoption is permitted. We do not expect the adoption of this standard to have any impact on our consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18), which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU 2016-18 will be effective for us beginning on February 1, 2018 and will be applied on a retrospective basis. Early adoption is permitted. We are currently evaluating the impact of this standard on our consolidated financial statements.

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Oct. 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 October 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 October 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ — $ — $ — $ 12,734 Level 2 U.S. government treasury notes 143,532 67 (27 ) 143,572 14,949 128,623 — U.S. government agencies 41,161 13 (55 ) 41,119 — 41,119 — Corporate debt securities 192,944 581 (110 ) 193,415 — 193,415 — Foreign government bonds 2,625 3 — 2,628 — 2,628 — Total $ 380,262 $ 664 $ (192 ) $ 380,734 $ 14,949 $ 365,785 $ 12,734
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 October 31, 2016 Amortized Cost Fair Value Due within one year $ 95,602 $ 95,673 Due in one to five years 269,711 270,112 Total $ 365,313 $ 365,785
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 October 31, 2016 , aggregated by investment category (in thousands): Less than 12 months Fair Value Unrealized Loss U.S. government treasury notes $ 35,647 $ (27 ) U.S. government agencies 28,274 (55 ) Corporate debt securities 47,483 (110 ) Total $ 111,404 $ (192 )

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Oct. 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 As of Test equipment $ 65,663 $ 103,491 Computer, equipment and software 31,388 50,235 Furniture and fixtures 2,852 4,072 Leasehold improvements 4,935 9,902 Total property and equipment 104,838 167,700 Less: accumulated depreciation and amortization (52,209 ) (85,612 ) Property and equipment, net $ 52,629 $ 82,088
Schedule of Intangible Assets, Net	Intangible assets, net, consist of the following (in thousands): As of As of Technology patents $ 9,125 $ 10,125 Accumulated amortization (2,145 ) (3,189 ) Intangible assets, net $ 6,980 $ 6,936
Schedule of Expected Amortization Expenses for Intangible Assets	As of October 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 $ 376 2018 1,504 2019 1,504 2020 1,504 2021 1,504 Thereafter 544 Total $ 6,936
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 October 31, 2016 Sales and use tax payable $ 299 $ 406 Accrued professional fees 3,044 3,256 Accrued marketing 2,684 6,908 Accrued travel and entertainment expenses 2,182 2,977 Income tax payable 1,791 974 Other accrued liabilities 4,076 6,024 Total accrued expenses and other liabilities $ 14,076 $ 20,545

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	9 Months Ended
	Oct. 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 stock option 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 1,999,000 12.69 Options exercised (6,111,682 ) 1.75 Options forfeited/cancelled (2,196,344 ) 11.67 Balance as of October 31, 2016 62,570,061 $ 6.90 7.3 $ 400,802 Vested and exercisable as of October 31, 2016 27,652,418 $ 3.59 6.4 $ 250,249
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 8,906,750 13.36 Vested (622,500 ) 14.13 Forfeited (309,878 ) 13.69 Unvested Balance as of October 31, 2016 8,027,372 $ 13.32
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 Nine Months Ended 2015 2016 2015 2016 Cost of revenue—product $ 43 $ 138 $ 139 $ 425 Cost of revenue—support 657 1,178 1,511 3,982 Research and development 8,195 15,241 18,624 40,875 Sales and marketing 4,559 8,468 10,539 24,719 General and administrative 2,085 3,210 5,385 9,128 Total stock-based compensation expense $ 15,539 $ 28,235 $ 36,198 $ 79,129

Net Loss per Share Attributab21

Net Loss per Share Attributable to Common Stockholders (Tables)	9 Months Ended
	Oct. 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 Nine Months Ended 2015 2016 2015 2016 Net loss $ (56,501 ) $ (78,813 ) $ (169,458 ) $ (202,151 ) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 74,565 195,807 47,109 192,637 Net loss per share attributable to common stockholders, basic and diluted $ (0.76 ) $ (0.40 ) $ (3.60 ) $ (1.05 )
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 Nine Months Ended 2015 2016 2015 2016 Stock options to purchase common stock 63,738 62,874 59,611 65,594 Restricted stock units — 6,342 — 4,155 Early exercised stock options 3,318 2,246 3,849 2,451 Employee stock purchase plan — 434 — 434 Total 67,056 71,896 63,460 72,634

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Oct. 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 Nine Months Ended 2015 2016 2015 2016 United States $ 105,615 $ 152,134 $ 229,892 $ 385,464 Rest of the world 25,749 44,822 60,210 114,653 Total revenue $ 131,364 $ 196,956 $ 290,102 $ 500,117
Schedule of Long-Lived Assets by Geographic Area	Long-lived assets by geographic area are summarized as follows (in thousands): As of As of United States $ 50,501 $ 78,952 Rest of the world 2,128 3,136 Total long-lived assets $ 52,629 $ 82,088

Basis of Presentation and Sum23

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 31, 2016USD ($)	Apr. 30, 2016USD ($)	Oct. 31, 2015USD ($)	Oct. 31, 2016USD ($)source	Oct. 31, 2015USD ($)	Jan. 31, 2016USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]
Restricted cash	$ 12,734			$ 12,734		$ 7,132
Deferred commissions, current	14,298			14,298		15,703
Deferred income taxes, non-current	13,800			13,800		$ 14,300
Sales commission expenses	21,600		$ 16,500	$ 58,800	$ 38,600
Number of revenue sources | source				2
Decrease in provision for income taxes	441		751	$ 967	965
Total stock-based compensation expense	$ 28,235		$ 15,539	79,129	$ 36,198
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				$ (921)
Total stock-based compensation expense		$ 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	Oct. 31, 2016	Jan. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 380,262	$ 52,746
Gross Unrealized Gains	664	0
Gross Unrealized Losses	(192)	0
Fair Value	380,734	52,746
Cash Equivalents	14,949	45,614
Marketable Securities	365,785	0
Restricted Cash	12,734	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 deposits | 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	12,734
U.S. government treasury notes | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	143,532
Gross Unrealized Gains	67
Gross Unrealized Losses	(27)
Fair Value	143,572
Cash Equivalents	14,949
Marketable Securities	128,623
Restricted Cash	0
U.S. government agencies | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	41,161
Gross Unrealized Gains	13
Gross Unrealized Losses	(55)
Fair Value	41,119
Cash Equivalents	0
Marketable Securities	41,119
Restricted Cash	0
Corporate debt securities | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	192,944
Gross Unrealized Gains	581
Gross Unrealized Losses	(110)
Fair Value	193,415
Cash Equivalents	0
Marketable Securities	193,415
Restricted Cash	0
Foreign government bonds | Level 2
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,625
Gross Unrealized Gains	3
Gross Unrealized Losses	0
Fair Value	2,628
Cash Equivalents	0
Marketable Securities	2,628
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	Oct. 31, 2016USD ($)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due within one year, Amortized Cost	$ 95,602
Due in one to five years, Amortized Cost	269,711
Total, Amortized Cost	365,313
Due within one year, Fair Value	95,673
Due in one to five years, Fair Value	270,112
Total, Fair Value	$ 365,785

Financial Instruments - Additio

Financial Instruments - Additional Information (Details)	Oct. 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	9 Months Ended
	Oct. 31, 2016USD ($)	Oct. 31, 2016USD ($)
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	$ 111,404	$ 111,404
Unrealized Losses of Less Than 12 Months	(192)	(192)
Gross realized gains, available-for-sale securities	65	175
U.S. government treasury notes
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	35,647	35,647
Unrealized Losses of Less Than 12 Months	(27)	(27)
U.S. government agencies
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	28,274	28,274
Unrealized Losses of Less Than 12 Months	(55)	(55)
Corporate debt securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value of Less Than 12 Months	47,483	47,483
Unrealized Losses of Less Than 12 Months	$ (110)	$ (110)

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment	$ 167,700	$ 104,838
Less: accumulated depreciation and amortization	(85,612)	(52,209)
Property and equipment, net	82,088	52,629
Test equipment
Property Plant And Equipment [Line Items]
Total property and equipment	103,491	65,663
Computer, equipment and software
Property Plant And Equipment [Line Items]
Total property and equipment	50,235	31,388
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	4,072	2,852
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment	$ 9,902	$ 4,935

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Balance Sheet Components Disclosure [Abstract]
Depreciation and amortization	$ 13,200	$ 8,500	$ 34,900	$ 22,100
Intangible assets amortization expense	$ 376	$ 326	$ 1,000	$ 978

Balance Sheet Components - Sc30

Balance Sheet Components - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Finite Lived Intangible Assets [Line Items]
Intangible assets, net	$ 6,936	$ 6,980
Technology patents
Finite Lived Intangible Assets [Line Items]
Technology patents	10,125	9,125
Accumulated amortization	(3,189)	(2,145)
Intangible assets, net	$ 6,936	$ 6,980

Balance Sheet Components - Sc31

Balance Sheet Components - Schedule of Expected Amortization Expenses for Intangible Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Balance Sheet Components Disclosure [Abstract]
Remainder of 2017	$ 376
2,018	1,504
2,019	1,504
2,020	1,504
2,021	1,504
Thereafter	544
Intangible assets, net	$ 6,936	$ 6,980

Balance Sheet Components - Sc32

Balance Sheet Components - Schedule of Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Balance Sheet Components Disclosure [Abstract]
Sales and use tax payable	$ 406	$ 299
Accrued professional fees	3,256	3,044
Accrued marketing	6,908	2,684
Accrued travel and entertainment expenses	2,977	2,182
Income tax payable	974	1,791
Other accrued liabilities	6,024	4,076
Total accrued expenses and other liabilities	$ 20,545	$ 14,076

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	Oct. 18, 2016USD ($)	Oct. 31, 2016USD ($)lease_agreement	Jan. 31, 2016USD ($)
Loss Contingencies [Line Items]
Outstanding letters of credit		$ 7.7	$ 7.1
Dell
Loss Contingencies [Line Items]
Litigation settlement payment	$ 30
Office Facility Leases
Loss Contingencies [Line Items]
Number of lease agreements | lease_agreement		4
Total operating lease obligations		$ 43.7

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details)	Oct. 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
Preferred stock, shares outstanding (in shares)	0	0
Number of classes of stock | class	2
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)	199,678,000	190,509,000
Common stock, shares outstanding (in shares)	199,678,000	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)	75,319,966	28,769,000
Common stock, shares outstanding (in shares)	75,319,966	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)	124,357,633	161,740,000
Common stock, shares outstanding (in shares)	124,357,633	161,740,000

Equity Incentive Plans - Additi

Equity Incentive Plans - Additional Information (Details)	Mar. 16, 2016USD ($)	Nov. 30, 2016USD ($)	Aug. 31, 2015USD ($)periodshares	Oct. 31, 2016USD ($)$ / sharesshares	Oct. 31, 2015USD ($)shares	Oct. 31, 2016USD ($)plan$ / sharesshares	Oct. 31, 2015USD ($)shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of equity incentive plans | plan						2
Total stock-based compensation expense				$ 28,235,000	$ 15,539,000	$ 79,129,000	$ 36,198,000
Unrecognized compensation cost, stock options				153,300,000		$ 153,300,000
Unrecognized compensation cost for stock options, weighted-average period						3 years 1 month
Subsequent event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan modification, incremental compensation cost		$ 5,900,000
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense				$ 193,000	$ 797,000	$ 2,200,000	$ 1,800,000
Number of options granted, net of cancellations (in shares) | shares				0	50,000	780,000	133,000
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
Unrecognized compensation cost				$ 98,100,000		$ 98,100,000
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
Employee stock purchase plan offering period	24 months
Purchase period, term			6 months
Modification charge related to the ESPP reset	$ 10,600,000
Total stock-based compensation expense				4,800,000	$ 907,000	$ 13,400,000	$ 907,000
Unrecognized stock-based compensation expense				$ 27,200,000		$ 27,200,000
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing price of stock (in dollars per share) | $ / shares				$ 12.34		$ 12.34
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]
Increase in shares reserved by percentage of capital stock			1.00%
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	9 Months Ended	12 Months Ended
	Oct. 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	1,999,000
Options Outstanding, Number of Shares, Options exercised	(6,111,682)
Options Outstanding, Number of Shares, Options forfeited/cancelled	(2,196,344)
Options Outstanding, Number of Shares, Ending balance	62,570,061	68,879,087
Options Outstanding, Number of Shares, Vested and exercisable	27,652,418
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)	12.69
Weighted Average Exercise Price, Options exercised (in dollars per share)	1.75
Weighted Average Exercise Price, Options forfeited/cancelled (in dollars per share)	11.67
Weighted Average Exercise Price, Ending balance (in dollars per share)	6.90	$ 6.43
Weighted Average Exercise Price, Vested and exercisable (in dollars per share)	$ 3.59
Weighted Average Remaining Contractual Life (Years)	7 years 3 months 18 days	7 years 10 months 24 days
Weighted Average Remaining Contractual Life (Years), Vested and exercisable	6 years 4 months 24 days
Aggregate Intrinsic Value	$ 400,802	$ 505,131
Aggregate Intrinsic Value, Vested and exercisable	$ 250,249

Equity Incentive Plans - Summ37

Equity Incentive Plans - Summary of Restricted Stock Unit Activity Under 2015 Plan (Details) - Restricted Stock Units	9 Months Ended
	Oct. 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	8,906,750
Number of Restricted Stock Units Outstanding, Vested (in shares) | shares	(622,500)
Number of Restricted Stock Units Outstanding, Forfeited (in shares) | shares	(309,878)
Number of Restricted Stock Units Outstanding, Unvested, Ending balance (in shares) | shares	8,027,372
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	13.36
Weighted-Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	14.13
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	13.69
Weighted-Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares	$ 13.32

Equity Incentive Plans - Summ38

Equity Incentive Plans - Summary of Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 28,235	$ 15,539	$ 79,129	$ 36,198
Cost of revenue—product
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	138	43	425	139
Cost of revenue—support
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	1,178	657	3,982	1,511
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	15,241	8,195	40,875	18,624
Sales and marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	8,468	4,559	24,719	10,539
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 3,210	$ 2,085	$ 9,128	$ 5,385

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		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Earnings Per Share [Abstract]
Net loss	$ (78,813)	$ (56,501)	$ (202,151)	$ (169,458)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	195,807	74,565	192,637	47,109
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.40)	$ (0.76)	$ (1.05)	$ (3.60)

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		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 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)	71,896	67,056	72,634	63,460
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)	62,874	63,738	65,594	59,611
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)	6,342	0	4,155	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)	2,246	3,318	2,451	3,849
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)	434	0	434	0

Segment Information - Additiona

Segment Information - Additional Information (Details)	9 Months Ended
	Oct. 31, 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		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 196,956	$ 131,364	$ 500,117	$ 290,102
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	152,134	105,615	385,464	229,892
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 44,822	$ 25,749	$ 114,653	$ 60,210

Segment Information - Schedul43

Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 82,088	$ 52,629
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	78,952	50,501
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 3,136	$ 2,128