Box (BOX) 10-Q 9 Jun 17 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Apr. 30, 2017	May 31, 2017
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	BOX
Entity Registrant Name	BOX INC
Entity Central Index Key	1,372,612
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Class A Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		80,348,904
Class B Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		52,449,596

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 183,691	$ 177,391
Accounts receivable, net of allowance of $2,189 and $3,346	82,767	120,113
Prepaid expenses and other current assets	14,836	10,826
Deferred commissions	12,776	13,771
Total current assets	294,070	322,101
Property and equipment, net	117,568	117,176
Intangible assets, net	140	543
Goodwill	16,293	16,293
Restricted cash	26,781	26,781
Other long-term assets	9,023	10,780
Total assets	463,875	493,674
Current liabilities:
Accounts payable	13,829	6,658
Accrued compensation and benefits	16,329	30,415
Accrued expenses and other current liabilities	20,034	17,713
Capital lease obligations	15,663	13,748
Deferred revenue	208,615	228,656
Deferred rent	1,084	751
Total current liabilities	275,554	297,941
Debt, non-current	40,000	40,000
Capital lease obligations, non-current	24,644	21,697
Deferred revenue, non-current	15,700	13,328
Deferred rent, non-current	45,329	44,207
Other long-term liabilities	2,804	1,769
Total liabilities	404,031	418,942
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, par value $0.0001 per share; 100,000 shares authorized, no shares issued and outstanding as of April 30 (unaudited) and January 31, 2017
Additional paid-in capital	985,313	960,144
Treasury stock	(1,177)	(1,177)
Accumulated other comprehensive loss	(91)	(120)
Accumulated deficit	(924,214)	(884,128)
Total stockholders’ equity	59,844	74,732
Total liabilities and stockholders’ equity	463,875	493,674
Class A Common Stock
Stockholders’ equity:
Common stock, value	8	7
Class B Common Stock
Stockholders’ equity:
Common stock, value	$ 5	$ 6

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2016
Allowance for accounts receivable	$ 2,189	$ 3,346
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock
Common Stock, par value	$ 0.0001	$ 0.0001
Common Stock, shares authorized	1,000,000,000	1,000,000,000
Common Stock, shares issued	77,966,000	67,831,000
Common Stock, shares outstanding	77,966,000	67,831,000
Class B Common Stock
Common Stock, par value	$ 0.0001	$ 0.0001
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	54,807,000	62,780,000
Common Stock, shares outstanding	54,807,000	62,780,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Income Statement [Abstract]
Revenue	$ 117,222	$ 90,155
Cost of revenue	32,723	27,859
Gross profit	84,499	62,296
Operating expenses:
Research and development	33,534	26,907
Sales and marketing	70,663	59,472
General and administrative	20,281	14,509
Total operating expenses	124,478	100,888
Loss from operations	(39,979)	(38,592)
Interest expense, net	(279)	(176)
Other income, net	16	441
Loss before provision for income taxes	(40,242)	(38,327)
(Benefit) provision for income taxes	(156)	248
Net loss	$ (40,086)	$ (38,575)
Net loss per common share, basic and diluted	$ (0.30)	$ (0.31)
Weighted-average shares used to compute net loss per share, basic and diluted	131,469	124,932

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2017	Apr. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (40,086)	$ (38,575)
Other comprehensive income:
Changes in foreign currency translation adjustment	[1]	29	114
Net change in unrealized gain on available-for-sale investments	[1]		2
Other comprehensive income:	[1]	29	116
Comprehensive loss		$ (40,057)	$ (38,459)
[1]	Tax effect was not material

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (40,086)	$ (38,575)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	9,572	12,084
Stock-based compensation expense	22,946	16,089
Amortization of deferred commissions	4,990	4,771
Other	22	108
Changes in operating assets and liabilities:
Accounts receivable, net	37,346	41,927
Deferred commissions	(2,784)	(2,257)
Prepaid expenses and other assets, current and noncurrent	(2,541)	(227)
Accounts payable	7,182	266
Accrued expenses and other liabilities	(10,967)	(26,698)
Deferred rent	530	2,510
Deferred revenue	(17,669)	(14,229)
Net cash provided by (used in) operating activities	8,541	(4,231)
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturities of marketable securities		6,586
Purchases of property and equipment	(784)	(10,976)
Proceeds from sale of property and equipment	27	4
Net cash used in investing activities	(757)	(4,386)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of borrowing costs		(93)
Proceeds from exercise of stock options, net of repurchases of early exercised stock options	2,456	2,246
Proceeds from issuances of common stock under employee stock purchase plan	8,881	9,016
Employee payroll taxes paid related to net share settlement of restricted stock units	(9,114)	(4,768)
Payments of capital lease obligations	(3,736)	(949)
Net cash (used in) provided by financing activities	(1,513)	5,452
Effect of exchange rate changes on cash and cash equivalents	29	114
Net increase (decrease) in cash and cash equivalents	6,300	(3,051)
Cash and cash equivalents, beginning of period	177,391	185,741
Cash and cash equivalents, end of period	183,691	182,690
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest, net of amounts capitalized	423	233
Cash paid for income taxes, net of tax refunds	545	118
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in accrued equipment purchases	(1,164)	(12,844)
Purchases of property and equipment under capital lease	9,709	4,348
Change in unpaid tax related to capital lease	$ 235	(198)
Change in unpaid taxes related to net share settlement of restricted stocks		461
Vesting of early exercised stock options and restricted stock		$ 11

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
	Apr. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Note 1. Description of Business and Basis of Presentation Description of Business We were incorporated in the state of Washington in April 2005, and were reincorporated in the state of Delaware in March 2008. We changed our name from Box.Net, Inc. to Box, Inc. in November 2011. Box provides a leading cloud content management platform that enables organizations of all sizes to securely manage cloud content while allowing easy, secure access and sharing of this content from anywhere, on any device. Basis of Presentation The accompanying condensed consolidated balance sheet as of April 30, 2017 and the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive loss and the condensed consolidated statements of cash flows for the three months ended April 30, 2017 and 2016, respectively, are unaudited. The condensed consolidated balance sheet data as of January 31, 2017 was derived from the audited consolidated financial statements that are included in our Annual Report on Form 10-K for the fiscal year ended January 31, 2017 (the “Form 10-K”), which was filed with the Securities and Exchange Commission (the “SEC”) on March 24, 2017. The accompanying statements should be read in conjunction with the audited consolidated financial statements and related notes contained in our Form 10-K. There have been no changes to our critical accounting policies and estimates during the three months ended April 30, 2017 from those disclosed in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Form 10-K. The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, they do not include all of the financial information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of our management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements in the Form 10-K, and include all adjustments necessary for the fair presentation of our balance sheet as of April 30, 2017, and our results of operations, including our comprehensive loss, and our cash flows for the three months ended April 30, 2017 and 2016. All adjustments are of a normal recurring nature. The results for the three months ended April 30, 2017 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending January 31, 2018. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make, on an ongoing basis, estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of the allowance for accounts receivable, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, best estimate of selling price included in multiple-deliverable revenue arrangements, fair values of stock-based awards, legal contingencies, and the provision for income taxes, including related reserves, among others. Management bases its estimates on historical experience and on various other assumptions which management believes to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Certain Risks and Concentrations Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash and accounts receivable. Although we deposit our cash with multiple financial institutions, our deposits, at times, may exceed federally insured limits. We sell to a broad range of customers, including resellers. Our revenue is derived substantially from the United States across a multitude of industries. Accounts receivable are derived from the delivery of our services to customers primarily located in the United States. We accept and settle our accounts receivable using credit cards, electronic payments and checks. A majority of our lower dollar value invoices are settled by credit card on or near the date of the invoice. We do not require collateral from customers to secure accounts receivable. We maintain an allowance for accounts receivable based upon the expected collectability, which takes into consideration specific customer creditworthiness and current economic trends. We believe collections of our accounts receivable are reasonably assured based on the size, industry diversification, financial condition and past transaction history of our customers. As of April 30, 2017, one customer, which was a reseller, accounted for more than 10% of total accounts receivable. As of January 31, 2017, two customers, which were both resellers, accounted for more than 10% of total accounts receivable. No single customer, including resellers, represented over 10% of revenue during the three months ended April 30, 2017 and 2016. We serve our customers and users from datacenter facilities operated by third parties. In order to reduce the risk of down time of our enterprise cloud content services, we have established datacenters and third-party cloud computing and hosting providers in various locations in the United States and abroad. We have internal procedures to restore services in the event of disaster at any one of our current datacenter facilities. Even with these procedures for disaster recovery in place, our cloud services could be significantly interrupted during the implementation of the procedures to restore services. Geographic Locations Revenue attributed to the United States was 78% and 83% for the three months ended April 30, 2017 and 2016, respectively. No other country outside of the United States comprised 10% or greater of our revenue for any of the periods presented. Substantially all of our net assets are located in the United States. As of April 30 and January 31, 2017, property and equipment located in the United States was 99.7%. Recently Issued Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment. In November 2016, the FASB issued ASU 2016-18 , Statement of Cash Flows: Restricted Cash In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payment In June 2016, the FASB issued ASU 2016-13, Financial Instruments- Credit Losses In February 2016, the FASB issued ASU 2016-02, Leases In May 2014, the FASB issued ASU 2014-09 regarding ASC Topic 606, Revenue from Contracts with Customers We have established a cross-functional coordinated implementation team to implement the standard update related to the recognition of revenue from contracts with customers. We have identified, and are in the process of implementing, appropriate changes to our business processes, systems and controls to support recognition and disclosure under the new standard. Based on our ongoing evaluation, we believe the impacts of this ASU will be related to the capitalization and amortization of sales commissions, the timing of revenue recognition for certain sales contracts, and their respective disclosures. We expect there may be a change to the period over which sales commissions will be amortized to align to an estimated customer life and a change to the scope of capitalized sales commissions based on the definition of incremental costs of obtaining a contract. In addition, there may be a change in relation to the timing of revenue recognition for certain sales contracts, due primarily to the removal of the current limitation on contingent revenue. These changes are being evaluated to determine the potential impact to our financial statements and disclosures. We continue to assess all potential impacts of this ASU, so our preliminary conclusions may change. Recently Adopted Accounting Pronouncements In April 2016, the FASB issued ASU 2016-09, Compensation- Stock Compensation As required by the standard, excess tax benefits recognized on stock-based compensation expense were prospectively reflected in our condensed consolidated statements of income as a component of the provision for income taxes rather than on the condensed consolidated balance sheet as a paid-in capital. Included in our net operating loss and research and development tax credit carryforwards are approximately $25.2 million of excess tax benefits from employee stock option exercises, for which we have not realized a deferred tax asset since it is fully offset by a valuation allowance, resulting in no impact to our consolidated financial statements including any cumulative effect to accumulated deficit from previously unrecognized excess tax benefits. Our policy has been to classify cash flows related to excess tax benefits as part of operating activities and cash payments made on employee’s behalf for withheld shares as part of financing activities, and thus, the adoption of this standard had no effect on our condensed consolidated statements of cash flows. Further, we did not elect an accounting policy change to record forfeitures as they occur and thus will continue to estimate the number of forfeitures expected to occur. Other amendments in the guidance did not impact our condensed consolidated financial statements.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Apr. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 2. Fair Value Measurements We define fair value as the exchange price that would be received from selling 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 1—Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2—Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices which are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. • Level 3—Unobservable inputs which are supported by little or no market activity and which 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 measure restricted cash at fair value on a recurring basis. We classify this asset within Level 1 or Level 2 because they are valued using either quoted market prices for identical assets 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. We have restricted cash in the form of certificates of deposits of $26.8 million as of April 30 and January 31, 2017 classified within Level 2.

Balance Sheet Components

Balance Sheet Components	3 Months Ended
	Apr. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	Note 3. Balance Sheet Components Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands): April 30, January 31, 2017 2017 Prepaid expenses $ 11,029 $ 9,256 Other current assets 3,807 1,570 Total prepaid expenses and other current assets $ 14,836 $ 10,826 Property and Equipment, Net Property and equipment, net consisted of the following (in thousands): April 30, January 31, 2017 2017 Servers $ 145,081 $ 143,219 Leasehold improvements 64,422 64,379 Computer hardware and software 11,688 11,373 Furniture and fixtures 12,941 12,824 Construction in progress 9,039 5,882 Total property and equipment 243,171 237,677 Less: accumulated depreciation (125,603 ) (120,501 ) Total property and equipment, net $ 117,568 $ 117,176 As of April 30, 2017, the gross carrying amount of property and equipment included $50.5 million of servers and $8.4 million of construction in progress acquired under capital leases, and the accumulated depreciation of property and equipment acquired under these capital leases was $14.3 million. As of January 31, 2017, the gross carrying amount of property and equipment included $43.2 million of servers and related equipment and $5.6 million of construction in progress acquired under capital leases, and the accumulated depreciation of property and equipment acquired under these capital leases was $10.4 million. Depreciation expense related to property and equipment was $9.2 million and $10.6 million for the three months ended April 30, 2017 and 2016, respectively. Included in these amounts was depreciation expense for servers acquired under capital leases in the amount of $3.8 million and $1.3 million for the three months ended April 30, 2017 and 2016, respectively. Construction in progress primarily consists of servers, networking equipment and storage infrastructure being provisioned in our datacenter facilities as well as leasehold improvements.

Acquisitions

Acquisitions	3 Months Ended
	Apr. 30, 2017
Business Combinations [Abstract]
Acquisitions	Note 4. Acquisitions Wagon Analytics, Inc. On August 30, 2016, we entered into an agreement to license certain technology and hire certain employees from Wagon Analytics, Inc., a privately-held data analysis company, for a total purchase price of $2.0 million. This agreement has been accounted for as a business combination. The entire purchase price was allocated to goodwill. Goodwill is attributable to future growth and potential enhancement opportunities for our analytics platform . Goodwill is deductible for U.S. income tax purposes. Transaction costs related to this business combination were not material. Results of operations for this business combination have been included in our consolidated statements of operations since the acquisition date and were not material. Pro forma results of operations for this business combination have not been presented because they were also not material to the consolidated results of operations.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Apr. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note 5. Goodwill and Intangible Assets There was no goodwill activity during the three months ended April 30, 2017. Intangible assets consisted of the following (in thousands): Weighted Average Useful Life (1) Gross Value Accumulated Amortization Net Carrying Value April 30, 2017 Developed technology 2.5 years $ 14,273 $ (14,273 ) $ — Trade name and other 6.9 years 1,201 (1,061 ) 140 Intangibles, net $ 15,474 $ (15,334 ) $ 140 January 31, 2017 Developed technology 2.5 years $ 14,273 $ (13,908 ) $ 365 Trade name and other 6.9 years 1,201 (1,023 ) 178 Intangibles, net $ 15,474 $ (14,931 ) $ 543 (1) From the date of acquisition Intangible amortization expense was $0.4 million and $1.5 million for the three months ended April 30, 2017 and 2016, respectively. Amortization of acquired technology is included in cost of revenue and amortization for trade names is included in general and administrative expenses in the consolidated statements of operations. As of April 30, 2017, expected amortization expense for intangible assets was as follows (in thousands): Years ending January 31: Remainder of 2018 $ 116 2019 23 2020 1 $ 140

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 6. Commitments and Contingencies Letters of Credit As of April 30 and January 31, 2017, we had letters of credit in the aggregate amount of $26.8 million in connection with our operating and capital leases. Letters of credit in connection with our facility leases are collateralized by certificates of deposit. Refer to Note 7 for additional details. Leases We have entered into various non-cancellable operating lease agreements for certain of our offices and datacenters with lease periods expiring primarily between fiscal years 2018 and 2029. Certain of these arrangements have free or escalating rent payment provisions and optional renewal clauses. We are also committed to pay a portion of the actual operating expenses under certain of these lease agreements. These operating expenses are not included in the table below. We also entered into various capital lease arrangements to obtain servers for our operations. These agreements are typically for three to four years. The leases are secured by the underlying leased servers. As of April 30, 2017, future minimum lease payments under non-cancellable capital and operating leases are as follows (in thousands): Years ending January 31: Capital Leases Operating Leases, Sublease Income Remainder of 2018 $ 12,603 $ 16,964 2019 14,327 26,672 2020 8,828 30,803 2021 5,584 30,626 2022 302 27,966 Thereafter — 146,592 Total minimum lease payments $ 41,644 $ 279,623 Less: amount representing interest (1,337 ) Present value of minimum lease payments $ 40,307 We sublease certain floors of our headquarters and one floor of our office in San Francisco. These subleases have terms ranging from 19 to 49 months that will expire between fiscal 2018 and 2021. Non-cancellable sublease proceeds for the years ending January 31, 2018, 2019, 2020 and 2021 of $5.7 million, $5.8 million, $1.9 million and $1.7 million, respectively, are included in the table above. We establish assets and liabilities for the present value of estimated future costs to return certain of our leased facilities to their original condition. Such assets are depreciated over the lease period into operating expense, and the recorded liabilities are accreted to the future value of the estimated restoration costs. We did not have material asset retirement obligations as of April 30, 2017 and January 31, 2017. In addition, sufficient information did not exist as of April 30, 2017 to reasonably estimate the fair value of asset retirement obligations for a Tokyo, Japan lease signed in April 2017. We recognize rent expense under our operating leases on a straight-line basis. Rent expense totaled $5.3 million and $4.4 million, net of sublease income of $1.9 million and $1.6 million for the three months ended April 30, 2017 and 2016, respectively. Purchase Obligations As of April 30, 2017, future payments under non-cancellable contractual purchases, which relate primarily to datacenter operations and sales and marketing activities, are as follows (in thousands): Years ending January 31: Remainder of 2018 $ 7,653 2019 16,887 2020 15,000 $ 39,540 Legal Matters In June 2013, Open Text S.A. (Open Text) filed a lawsuit against us in the U.S. District Court, Eastern District of Virginia, alleging that our core cloud software and Box Edit application infringed 12 patents of Open Text. This case was subsequently transferred to the U.S. District Court for the Northern District of California and, in February 2015, went to trial. In February 2015, the jury returned a verdict in which it awarded damages in favor of Open Text in a lump sum and fully paid-up royalty in the amount of $4.9 million. Both parties appealed certain aspects of the trial. While we continued to defend the lawsuit vigorously and continued to believe we had valid defense to Open Text’s claims, we considered the issuance of the verdict a recognized subsequent event that provided additional evidence about conditions which existed as of January 31, 2015. Accordingly, as of January 31, 2015, we accrued $4.9 million in relation to the jury award and recorded an expense in the amount of $3.9 million for the year ended January 31, 2015, in relation to the portion of the jury award attributable to prior periods. The portion of the jury award attributable to future periods was recorded as an asset as of January 31, 2015. This asset was amortized over an estimated useful life of 14 months, and the amortization expense was $0.9 million for the year ended January 31, 2016. In addition, we deemed Open Text’s claim for interest on the jury award amount to be probable and estimable for the first time in July 2015. As such, we accrued additional expenses in the aggregate amount of $0.7 million during the year ended January 31, 2016, in relation to the interest on the jury award amount. On March 31, 2016, we entered into a Confidential Settlement and Release Agreement with Open Text (the “Settlement Agreement”), which fully settled the lawsuit and resulted in a full dismissal of the case against the Company. In connection with such settlement, we paid $3. 75 million in total to Open Text, and our obligation to pay the jury award amount of approximately $4.9 million and all pre- and post-judgment interest was terminated. The parties agreed to drop all appeals pending in connection with the litigation and each agreed to certain standard mutual releases related to the subject matter of the suit. We recorded the settlement payment of $3.75 million, reversed previous related accruals and interest of $5.6 million, and recorded $0.1 million in recurring amortization for the asset, resulting in net income of $1.7 million in our condensed consolidated statement of operations for the three months ended April 30, 2016. In addition to the litigation discussed above, from time to time, we are a party to litigation and subject to claims that arise in the ordinary course of business. We investigate these claims as they arise, and accrue estimates for resolution of legal and other contingencies when losses are probable and estimable. Although the results of litigation and claims cannot be predicted with certainty, we believe there was not at least a reasonable possibility that we had incurred a material loss with respect to such loss contingencies as of April 30, 2017. Indemnification We include service level commitments to our customers warranting certain levels of uptime reliability and performance and permitting those customers to receive credits in the event that we fail to meet those levels. In addition, our customer contracts often include (i) specific obligations that we maintain the availability of the customer’s data through our service and that we secure customer content against unauthorized access or loss, and (ii) indemnity provisions whereby we indemnify our customers for third-party claims asserted against them that result from our failure to maintain the availability of their content or securing the same from unauthorized access or loss. To date, we have not incurred any material costs as a result of such commitments. Our arrangements generally include certain provisions for indemnifying customers against liabilities if our products or services infringe a third party’s intellectual property rights. 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 material 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.

Debt

Debt	3 Months Ended
	Apr. 30, 2017
Debt Disclosure [Abstract]
Debt	Note 7. Debt Line of Credit In December 2015, we entered into a revolving credit facility (December 2015 Facility) with a lender in the amount of up to $40.0 million maturing in December 2017. The December 2015 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%. Although no minimum deposit is required for the December 2015 Facility, we are eligible for the lowest interest rate if we maintain at least $40 million in deposits with the lender. In addition, there is an annual fee of 0.2% on the total commitment amount. We drew $40.0 million at 1.82% (six month LIBOR plus 1.25%). Borrowings under the December 2015 Facility are collateralized by substantially all of our assets in the United States. It also contains various covenants, including covenants related to the delivery of financial and other information, the maintenance of quarterly financial covenants, as well as customary limitations on dispositions, mergers or consolidations and other corporate activities. As of April 30, 2017, we were in compliance with all financial covenants. In February 2017, we amended the December 2015 Facility to extend the maturity date to December 2018. In connection with the December 2015 Facility, we incurred interest expense, net of capitalized interest costs, of $0.2 million both during the three months ended April 30, 2017 and 2016. Interest expense also includes amortization of issuance costs, commitment fees and fees on letters of credit which are recognized over the related term of the borrowing.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Apr. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note 8. Stock-Based Compensation 2015 Equity Incentive Plan In January 2015, our board of directors adopted the 2015 Equity Incentive Plan (2015 Plan), which became effective prior to the completion of our initial public offering (IPO). A total of 12,200,000 shares of Class A common stock was initially reserved for issuance pursuant to future awards under the 2015 Plan. On the first day of each fiscal year, shares available for issuance are increased based on the provisions of the 2015 Plan. Any shares subject to outstanding awards under our 2006 Equity Incentive Plan (2006 Plan) or 2011 Equity Incentive Plan (2011 Plan) that are cancelled or repurchased subsequent to the 2015 Plan’s effective date are returned to the pool of shares reserved for issuance under the 2015 Plan. Awards granted under the 2015 Plan may be (i) incentive stock options, (ii) nonstatutory stock options, (iii) restricted stock units, (iv) restricted stock awards or (v) stock appreciation rights, as determined by our board of directors at the time of grant. Options and restricted stock units generally vest 25% one year from the vesting commencement date and (a) in the case of options, 1/48 th 2015 Employee Stock Purchase Plan In January 2015, our board of directors adopted the 2015 Employee Stock Purchase Plan (2015 ESPP), which became effective prior to the completion of our IPO. A total of 2,500,000 shares of Class A common stock was initially reserved for issuance under the 2015 ESPP. On the first day of each fiscal year, shares available for issuance are increased based on the provisions of the 2015 ESPP. The 2015 ESPP allows eligible employees to purchase shares of our Class A common stock at a discount of up to 15% through payroll deductions of their eligible compensation, subject to any plan limitations. Except for the initial offering period, the 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period consists of four six-month purchase periods. On each purchase date, eligible employees will purchase our stock at a price per share equal to 85% of the lesser of (1) the fair market value of our stock on the offering date or (2) the fair market value of our stock on the purchase date. In the event the price is lower on the last day of any purchase price period, in addition to using that price as the basis for that purchase period, the offering period resets and the new lower price becomes the new offering price for a new 24 month offering period. As of April 30, 2017, 2,969,790 shares were reserved for future issuance under the 2015 ESPP. Stock Options The following table summarizes the stock option activity under the equity incentive plans and related information: Shares Weighted-Average Weighted- Remaining Average Exercise Contractual Life Aggregate Shares Price (Years) Intrinsic Value (in thousands) Balance as of January 31, 2017 12,318,800 $ 7.44 Options granted 1,030,000 16.67 Option exercised (531,910 ) 4.62 Options forfeited/cancelled (65,575 ) 15.15 Balance as of April 30, 2017 12,751,315 $ 8.27 6.50 $ 115,138 Vested and expected to vest as of April 30, 2017 12,600,593 $ 8.19 6.47 $ 114,682 Exercisable as of April 30, 2017 9,160,781 $ 5.91 5.68 $ 104,276 The aggregate intrinsic value of options vested and expected to vest and exercisable as of April 30, 2017 is calculated based on the difference between the exercise price and the current fair value of our common stock. The aggregate intrinsic value of exercised options for the three months ended April 30, 2017 and 2016 was $6.6 million and $11.9 million, respectively. The aggregate estimated fair value of stock options granted to employees that vested during the three months ended April 30, 2017 and 2016 was $2.6 million and $5.7 million, respectively. The weighted-average grant date fair value of options granted to employees during the three months ended April 30, 2017 and 2016 was $6.74 and $5.25 per share, respectively. As of April 30, 2017, there was $20.3 million of unrecognized stock-based compensation expense related to outstanding stock options granted to employees that is expected to be recognized over a weighted-average period of 2.77 years. In April 2017, the Compensation Committee of our Board of Directors approved and granted 475,000 performance-based stock options under the 2015 Plan to certain executive officers where vesting is subject to both the continued employment of the participant and the achievement of market based performance goals established by the Compensation Committee. Subject to the achievement of the performance goals, th Restricted Stock Units The following table summarizes the restricted stock unit activity under the equity incentive plans and related information: Number of Weighted- Restricted Average Stock Units Grant Date Outstanding Fair Value Unvested balance - January 31, 2017 11,822,316 $ 14.67 Granted 3,782,656 16.69 Vested, net of shares withheld for employee payroll taxes (792,847 ) 13.43 Forfeited/cancelled, including shares withheld for employee payroll taxes (837,932 ) 14.11 Unvested balance - April 30, 2017 13,974,193 $ 15.32 As of April 30, 2017, there was $193.8 million of unrecognized stock-based compensation expense related to outstanding restricted stock units granted to employees that is expected to be recognized over a weighted-average period of 2.98 years. Restricted Stock Awards The following table summarizes the restricted stock activity under the equity incentive plans and related information: Number of Weighted- Restricted Average Stock Grant Date Outstanding Fair Value Unvested balance - January 31, 2017 5,842 $ 11.86 Vested, net of shares withheld for employee payroll taxes (2,968 ) 17.67 Forfeited/cancelled, including shares withheld for employee payroll taxes — — Unvested balance - April 30, 2017 2,874 $ 5.85 . As of April 30, 2017, unrecognized stock-based compensation expense related to outstanding restricted stock granted to employees that is expected to be recognized over a remaining weighted-average period of about a month was immaterial. In addition, in connection with our fiscal 2015 acquisitions, we issued 344,667 shares of restricted stock awards with a weighted-average grant date fair value of $12.96 per share. These restricted stock awards were separately authorized by our board of directors, and did not reduce the number of shares available for future issuance under our equity incentive plans. As of April 30, 2017, there was $0.5 million of unrecognized stock-based compensation expense related to outstanding restricted stock awards granted outside of the equity incentive plans that is expected to be recognized over a weighted-average period of 0.48 year. In addition, there were 145,737 unvested shares as of April 30, 2017. 2015 ESPP As of April 30, 2017, there was $9.6 million of unrecognized stock-based compensation expense related to the 2015 ESPP that is expected to be recognized over the remaining term of the respective offering periods. Stock-Based Compensation The following table summarizes the components of stock-based compensation expense recognized in the consolidated statements of operations (in thousands): Three Months Ended April 30, 2017 2016 Cost of revenue $ 2,468 $ 1,512 Research and development 9,160 6,524 Sales and marketing 7,740 5,230 General and administrative 3,578 2,823 Total stock-based compensation $ 22,946 $ 16,089 Determination of Fair Value We estimated the fair value of employee stock options and 2015 ESPP purchase rights using generally a Black-Scholes option pricing model with the following assumptions: Three Months Ended April 30, 2017 2016 Employee Stock Options Expected term (in years) 6.0 6.0 Risk-free interest rate 2.1 % - 2.4% 1.3% Volatility 39 % - 40% 43% Dividend yield 0% 0% Employee Stock Purchase Plan Expected term (in years) 0.5 - 2.0 0.5 - 2.0 Risk-free interest rate 0.9 % - 1.4% 0.5 % - 0.9% Volatility 28 % - 43% 46 % - 60% Dividend yield 0% 0% The assumptions used in the Black-Scholes option pricing model were determined as follows: Fair Value of Common Stock . Prior to our IPO in January 2015, our board of directors considered numerous objective and subjective factors to determine the fair value of our common stock at each grant date. These factors included, but were not limited to, (i) contemporaneous valuations of our common stock performed by unrelated third-party specialists; (ii) the prices for our redeemable convertible preferred stock sold to outside investors; (iii) the rights, preferences and privileges of our redeemable convertible preferred stock relative to our common stock; (iv) the lack of marketability of our common stock; (v) developments in the business; and (vi) the likelihood of achieving a liquidity event, such as an IPO or a merger or acquisition, given prevailing market conditions. Subsequent to the completion of our IPO, we use the market closing price for our Class A common stock as reported on the New York Stock Exchange to determine the fair value of our common stock at each grant date. Expected Term . The expected term represents the period that our share-based awards are expected to be outstanding. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options and 2015 ESPP purchase rights. Expected Volatility . Since we do not have sufficient trading history of our common stock, the expected volatility was derived from the historical stock volatilities of several unrelated public companies within the same industry that we consider to be comparable to our business over a period equivalent to the expected term of the stock option grants and 2015 ESPP purchase rights. Risk-free Interest Rate . The risk-free rate that we use is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options. Dividend Yield . We have never declared or paid any cash dividends and do not plan to pay cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero.

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Apr. 30, 2017
Earnings Per Share [Abstract]
Net Loss per Share	Note 9. Net Loss per Share We calculate our basic and diluted net loss per share in conformity with the two-class method required for companies with participating securities. Under the two-class method, basic net loss per share is calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding for the period, less shares subject to repurchase. The diluted net loss per share is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, restricted stock units, employee stock purchase plan, repurchasable shares from early exercised options and unvested restricted stock, and contingently issuable shares are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share as their effect is antidilutive. 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 and conversion. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share 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 as-if converted basis because the impact was not dilutive. The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended April 30, 2017 2016 Class A Class B Class A Class B Numerator: Net loss $ (22,061 ) $ (18,025 ) $ (13,632 ) $ (24,943 ) Denominator: Weighted-average number of shares outstanding—basic and diluted 72,352 59,117 44,151 80,781 Net loss per share—basic and diluted $ (0.30 ) $ (0.30 ) $ (0.31 ) $ (0.31 ) The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because the impact of including them would have been antidilutive (in thousands): Three Months Ended April 30, 2017 2016 Options to purchase common stock 10,534 14,919 Restricted stock units 12,650 8,534 Employee stock purchase plan 2,187 3,133 Repurchasable shares from early-exercised options and unvested restricted stock 240 394 Contingently issuable common stock 60 88 25,671 27,068

Income Taxes

Income Taxes	3 Months Ended
	Apr. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 10. Income Taxes Utilization of the net operating loss carryforwards and credits may be subject to substantial annual limitation due to the ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization. We evaluate tax positions for recognition using a more-likely-than-not recognition threshold, and those tax positions eligible for recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon the effective settlement with a taxing authority that has full knowledge of all relevant information. We file tax returns in the United States for federal, California, and other states. All tax years remain open to examination for both federal and state purposes as a result of our net operating loss and credit carryforwards. We file foreign tax returns in the United Kingdom starting with the year ended January 31, 2013, in France, Germany and Japan starting with the year ended January 31, 2014, in Canada starting with the year ended January 31, 2015, and in Australia, Sweden, and Netherlands starting with the year ended January 31, 2016. These tax years remain open to examination. We believe that we have provided adequate reserves for our income tax uncertainties in all open tax years. We do not expect our gross unrecognized tax benefits to change significantly over the next 12 months.

Segments

Segments	3 Months Ended
	Apr. 30, 2017
Segment Reporting [Abstract]
Segments	Note 11. Segments Our chief operating decision maker reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. As such, we have a single reporting segment and operating unit structure. Since we operate in one operating segment, all required segment information can be found in the consolidated financial statements.

Description of Business and B18

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Apr. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make, on an ongoing basis, estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of the allowance for accounts receivable, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, best estimate of selling price included in multiple-deliverable revenue arrangements, fair values of stock-based awards, legal contingencies, and the provision for income taxes, including related reserves, among others. Management bases its estimates on historical experience and on various other assumptions which management believes to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
Certain Risks and Concentrations	Certain Risks and Concentrations Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash and accounts receivable. Although we deposit our cash with multiple financial institutions, our deposits, at times, may exceed federally insured limits. We sell to a broad range of customers, including resellers. Our revenue is derived substantially from the United States across a multitude of industries. Accounts receivable are derived from the delivery of our services to customers primarily located in the United States. We accept and settle our accounts receivable using credit cards, electronic payments and checks. A majority of our lower dollar value invoices are settled by credit card on or near the date of the invoice. We do not require collateral from customers to secure accounts receivable. We maintain an allowance for accounts receivable based upon the expected collectability, which takes into consideration specific customer creditworthiness and current economic trends. We believe collections of our accounts receivable are reasonably assured based on the size, industry diversification, financial condition and past transaction history of our customers. As of April 30, 2017, one customer, which was a reseller, accounted for more than 10% of total accounts receivable. As of January 31, 2017, two customers, which were both resellers, accounted for more than 10% of total accounts receivable. No single customer, including resellers, represented over 10% of revenue during the three months ended April 30, 2017 and 2016. We serve our customers and users from datacenter facilities operated by third parties. In order to reduce the risk of down time of our enterprise cloud content services, we have established datacenters and third-party cloud computing and hosting providers in various locations in the United States and abroad. We have internal procedures to restore services in the event of disaster at any one of our current datacenter facilities. Even with these procedures for disaster recovery in place, our cloud services could be significantly interrupted during the implementation of the procedures to restore services. Geographic Locations Revenue attributed to the United States was 78% and 83% for the three months ended April 30, 2017 and 2016, respectively. No other country outside of the United States comprised 10% or greater of our revenue for any of the periods presented. Substantially all of our net assets are located in the United States. As of April 30 and January 31, 2017, property and equipment located in the United States was 99.7%.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment. In November 2016, the FASB issued ASU 2016-18 , Statement of Cash Flows: Restricted Cash In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payment In June 2016, the FASB issued ASU 2016-13, Financial Instruments- Credit Losses In February 2016, the FASB issued ASU 2016-02, Leases In May 2014, the FASB issued ASU 2014-09 regarding ASC Topic 606, Revenue from Contracts with Customers We have established a cross-functional coordinated implementation team to implement the standard update related to the recognition of revenue from contracts with customers. We have identified, and are in the process of implementing, appropriate changes to our business processes, systems and controls to support recognition and disclosure under the new standard. Based on our ongoing evaluation, we believe the impacts of this ASU will be related to the capitalization and amortization of sales commissions, the timing of revenue recognition for certain sales contracts, and their respective disclosures. We expect there may be a change to the period over which sales commissions will be amortized to align to an estimated customer life and a change to the scope of capitalized sales commissions based on the definition of incremental costs of obtaining a contract. In addition, there may be a change in relation to the timing of revenue recognition for certain sales contracts, due primarily to the removal of the current limitation on contingent revenue. These changes are being evaluated to determine the potential impact to our financial statements and disclosures. We continue to assess all potential impacts of this ASU, so our preliminary conclusions may change. Recently Adopted Accounting Pronouncements In April 2016, the FASB issued ASU 2016-09, Compensation- Stock Compensation As required by the standard, excess tax benefits recognized on stock-based compensation expense were prospectively reflected in our condensed consolidated statements of income as a component of the provision for income taxes rather than on the condensed consolidated balance sheet as a paid-in capital. Included in our net operating loss and research and development tax credit carryforwards are approximately $25.2 million of excess tax benefits from employee stock option exercises, for which we have not realized a deferred tax asset since it is fully offset by a valuation allowance, resulting in no impact to our consolidated financial statements including any cumulative effect to accumulated deficit from previously unrecognized excess tax benefits. Our policy has been to classify cash flows related to excess tax benefits as part of operating activities and cash payments made on employee’s behalf for withheld shares as part of financing activities, and thus, the adoption of this standard had no effect on our condensed consolidated statements of cash flows. Further, we did not elect an accounting policy change to record forfeitures as they occur and thus will continue to estimate the number of forfeitures expected to occur. Other amendments in the guidance did not impact our condensed consolidated financial statements.
Stock-Based Compensation	The assumptions used in the Black-Scholes option pricing model were determined as follows: Fair Value of Common Stock . Prior to our IPO in January 2015, our board of directors considered numerous objective and subjective factors to determine the fair value of our common stock at each grant date. These factors included, but were not limited to, (i) contemporaneous valuations of our common stock performed by unrelated third-party specialists; (ii) the prices for our redeemable convertible preferred stock sold to outside investors; (iii) the rights, preferences and privileges of our redeemable convertible preferred stock relative to our common stock; (iv) the lack of marketability of our common stock; (v) developments in the business; and (vi) the likelihood of achieving a liquidity event, such as an IPO or a merger or acquisition, given prevailing market conditions. Subsequent to the completion of our IPO, we use the market closing price for our Class A common stock as reported on the New York Stock Exchange to determine the fair value of our common stock at each grant date. Expected Term . The expected term represents the period that our share-based awards are expected to be outstanding. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options and 2015 ESPP purchase rights. Expected Volatility . Since we do not have sufficient trading history of our common stock, the expected volatility was derived from the historical stock volatilities of several unrelated public companies within the same industry that we consider to be comparable to our business over a period equivalent to the expected term of the stock option grants and 2015 ESPP purchase rights. Risk-free Interest Rate . The risk-free rate that we use is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options. Dividend Yield . We have never declared or paid any cash dividends and do not plan to pay cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero.

Balance Sheet Components (Table

Balance Sheet Components (Tables)	3 Months Ended
	Apr. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): April 30, January 31, 2017 2017 Prepaid expenses $ 11,029 $ 9,256 Other current assets 3,807 1,570 Total prepaid expenses and other current assets $ 14,836 $ 10,826
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): April 30, January 31, 2017 2017 Servers $ 145,081 $ 143,219 Leasehold improvements 64,422 64,379 Computer hardware and software 11,688 11,373 Furniture and fixtures 12,941 12,824 Construction in progress 9,039 5,882 Total property and equipment 243,171 237,677 Less: accumulated depreciation (125,603 ) (120,501 ) Total property and equipment, net $ 117,568 $ 117,176

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Apr. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Components of Intangible Assets	Intangible assets consisted of the following (in thousands): Weighted Average Useful Life (1) Gross Value Accumulated Amortization Net Carrying Value April 30, 2017 Developed technology 2.5 years $ 14,273 $ (14,273 ) $ — Trade name and other 6.9 years 1,201 (1,061 ) 140 Intangibles, net $ 15,474 $ (15,334 ) $ 140 January 31, 2017 Developed technology 2.5 years $ 14,273 $ (13,908 ) $ 365 Trade name and other 6.9 years 1,201 (1,023 ) 178 Intangibles, net $ 15,474 $ (14,931 ) $ 543 (1) From the date of acquisition
Schedule of Expected Amortization Expense of Intangible Assets	As of April 30, 2017, expected amortization expense for intangible assets was as follows (in thousands): Years ending January 31: Remainder of 2018 $ 116 2019 23 2020 1 $ 140

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Apr. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Lease Payments under Non-cancellable Capital and Operating Leases	As of April 30, 2017, future minimum lease payments under non-cancellable capital and operating leases are as follows (in thousands): Years ending January 31: Capital Leases Operating Leases, Sublease Income Remainder of 2018 $ 12,603 $ 16,964 2019 14,327 26,672 2020 8,828 30,803 2021 5,584 30,626 2022 302 27,966 Thereafter — 146,592 Total minimum lease payments $ 41,644 $ 279,623 Less: amount representing interest (1,337 ) Present value of minimum lease payments $ 40,307
Future Payments under Non-cancellable Contractual Purchases	As of April 30, 2017, future payments under non-cancellable contractual purchases, which relate primarily to datacenter operations and sales and marketing activities, are as follows (in thousands): Years ending January 31: Remainder of 2018 $ 7,653 2019 16,887 2020 15,000 $ 39,540

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Apr. 30, 2017
Summary of Stock Option Activity Under Equity Incentive Plans and Related Information	The following table summarizes the stock option activity under the equity incentive plans and related information: Shares Weighted-Average Weighted- Remaining Average Exercise Contractual Life Aggregate Shares Price (Years) Intrinsic Value (in thousands) Balance as of January 31, 2017 12,318,800 $ 7.44 Options granted 1,030,000 16.67 Option exercised (531,910 ) 4.62 Options forfeited/cancelled (65,575 ) 15.15 Balance as of April 30, 2017 12,751,315 $ 8.27 6.50 $ 115,138 Vested and expected to vest as of April 30, 2017 12,600,593 $ 8.19 6.47 $ 114,682 Exercisable as of April 30, 2017 9,160,781 $ 5.91 5.68 $ 104,276
Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information	The following table summarizes the restricted stock unit activity under the equity incentive plans and related information: Number of Weighted- Restricted Average Stock Units Grant Date Outstanding Fair Value Unvested balance - January 31, 2017 11,822,316 $ 14.67 Granted 3,782,656 16.69 Vested, net of shares withheld for employee payroll taxes (792,847 ) 13.43 Forfeited/cancelled, including shares withheld for employee payroll taxes (837,932 ) 14.11 Unvested balance - April 30, 2017 13,974,193 $ 15.32
Summary of Components of Stock-Based Compensation Expense	The following table summarizes the components of stock-based compensation expense recognized in the consolidated statements of operations (in thousands): Three Months Ended April 30, 2017 2016 Cost of revenue $ 2,468 $ 1,512 Research and development 9,160 6,524 Sales and marketing 7,740 5,230 General and administrative 3,578 2,823 Total stock-based compensation $ 22,946 $ 16,089
Summary of Estimated Fair Value of Employee Stock Options	We estimated the fair value of employee stock options and 2015 ESPP purchase rights using generally a Black-Scholes option pricing model with the following assumptions: Three Months Ended April 30, 2017 2016 Employee Stock Options Expected term (in years) 6.0 6.0 Risk-free interest rate 2.1 % - 2.4% 1.3% Volatility 39 % - 40% 43% Dividend yield 0% 0% Employee Stock Purchase Plan Expected term (in years) 0.5 - 2.0 0.5 - 2.0 Risk-free interest rate 0.9 % - 1.4% 0.5 % - 0.9% Volatility 28 % - 43% 46 % - 60% Dividend yield 0% 0%
Restricted Stock Awards
Summary of Restricted Stock Award Activity Under Equity Incentive Plans and Related Information	The following table summarizes the restricted stock activity under the equity incentive plans and related information: Number of Weighted- Restricted Average Stock Grant Date Outstanding Fair Value Unvested balance - January 31, 2017 5,842 $ 11.86 Vested, net of shares withheld for employee payroll taxes (2,968 ) 17.67 Forfeited/cancelled, including shares withheld for employee payroll taxes — — Unvested balance - April 30, 2017 2,874 $ 5.85

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Apr. 30, 2017
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss Per Share	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended April 30, 2017 2016 Class A Class B Class A Class B Numerator: Net loss $ (22,061 ) $ (18,025 ) $ (13,632 ) $ (24,943 ) Denominator: Weighted-average number of shares outstanding—basic and diluted 72,352 59,117 44,151 80,781 Net loss per share—basic and diluted $ (0.30 ) $ (0.30 ) $ (0.31 ) $ (0.31 )
Summary of Weighted Average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share	The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because the impact of including them would have been antidilutive (in thousands): Three Months Ended April 30, 2017 2016 Options to purchase common stock 10,534 14,919 Restricted stock units 12,650 8,534 Employee stock purchase plan 2,187 3,133 Repurchasable shares from early-exercised options and unvested restricted stock 240 394 Contingently issuable common stock 60 88 25,671 27,068

Description of Business and B24

Description of Business and Basis of Presentation - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 30, 2017USD ($)Customer	Apr. 30, 2016Customer	Jan. 31, 2017USD ($)Customer
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Restricted cash | $	$ 26,781		$ 26,781
Excess tax benefits from employee stock option exercises included in net operating loss and research and development tax credit forwards | $	$ 25,200
Credit Concentration Risk | Accounts Receivable
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customer | Customer	1		2
Concentration risk percentage	10.00%		10.00%
Customer Concentration Risk | Revenue
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customer | Customer	0	0
Concentration risk percentage	10.00%	10.00%
Geographic Concentration Risk | Revenue | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	78.00%	83.00%
Geographic Concentration Risk | Property and Equipment | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	99.70%		99.70%

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Restricted cash	$ 26,781	$ 26,781
Certificates of Deposit | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Restricted cash	$ 26,800	$ 26,800

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 11,029	$ 9,256
Other current assets	3,807	1,570
Total prepaid expenses and other current assets	$ 14,836	$ 10,826

Balance Sheet Components - Sc27

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 243,171	$ 237,677
Less: accumulated depreciation	(125,603)	(120,501)
Total property and equipment, net	117,568	117,176
Servers
Property Plant And Equipment [Line Items]
Total property and equipment, gross	145,081	143,219
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	64,422	64,379
Computer hardware and software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	11,688	11,373
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	12,941	12,824
Construction in progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 9,039	$ 5,882

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Jan. 31, 2017
Property Plant And Equipment [Line Items]
Accumulated depreciation of property and equipment acquired under capital lease	$ 14.3		$ 10.4
Depreciation expense	9.2	$ 10.6
Servers
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under capital lease	50.5		43.2
Depreciation expense	3.8	$ 1.3
Construction in progress
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under capital lease	$ 8.4		$ 5.6

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) $ in Millions	Aug. 30, 2016USD ($)
Wagon Analytics, Inc.
Business Acquisition [Line Items]
Business acquisition, aggregate purchase price	$ 2

Goodwill and Intangible Asset30

Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill acquired	$ 0
Amortization of intangible assets	$ 400,000	$ 1,500,000

Goodwill and Intangible Asset31

Goodwill and Intangible Assets - Schedule of Components of Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Apr. 30, 2017	Jan. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Value		$ 15,474	$ 15,474
Accumulated Amortization		(15,334)	(14,931)
Net Carrying Value		$ 140	$ 543
Developed Technology
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	[1]	2 years 6 months	2 years 6 months
Gross Value		$ 14,273	$ 14,273
Accumulated Amortization		$ (14,273)	(13,908)
Net Carrying Value			$ 365
Trade name and other
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	[1]	6 years 10 months 24 days	6 years 10 months 24 days
Gross Value		$ 1,201	$ 1,201
Accumulated Amortization		(1,061)	(1,023)
Net Carrying Value		$ 140	$ 178
[1]	From the date of acquisition

Goodwill and Intangible Asset32

Goodwill and Intangible Assets - Schedule of Expected Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2018	$ 116
2,019	23
2,020	1
Net Carrying Value	$ 140	$ 543

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Thousands	Mar. 31, 2016USD ($)	Feb. 13, 2015USD ($)	Apr. 30, 2017USD ($)	Apr. 30, 2016USD ($)	Jan. 31, 2017USD ($)Floor	Jan. 31, 2016USD ($)	Jan. 31, 2015USD ($)
Commitments And Contingencies [Line Items]
Letters of credit facility			$ 26,800		$ 26,800
Rent expense			5,300	$ 4,400
Sublease income			1,900	1,600
Amortization of intangible assets			$ 400	1,500
Settlement Agreement
Commitments And Contingencies [Line Items]
Amortization of intangible assets	$ 100
Date of settlement agreement			Mar. 31, 2016
Jury award amount	4,900
Reversal of Previous Settlement Accruals and Interest	5,600
Income (Loss) Related to Litigation Settlement				$ 1,700
Open Text S.A.
Commitments And Contingencies [Line Items]
Damage awarded		$ 4,900
Accrual in relation to the jury award							$ 4,900
Litigation expense							$ 3,900
Weighted Average Useful Life							14 months
Accrued additional liability related to the interest on the jury award						$ 700
Open Text S.A. | Settlement Agreement
Commitments And Contingencies [Line Items]
Settlement amount paid	$ 3,750
Open Text S.A. | General and Administrative Expense
Commitments And Contingencies [Line Items]
Amortization of intangible assets						$ 900
San Francisco Building
Commitments And Contingencies [Line Items]
Number of floors for headquarters | Floor					1
Subleases Expire in Fiscal 2018 and 2021
Commitments And Contingencies [Line Items]
Non-cancellable sublease proceeds for the year ending January 31, 2018			$ 5,700
Non-cancellable sublease proceeds for the year ending January 31, 2019			5,800
Non-cancellable sublease proceeds for the year ending January 31, 2020			1,900
Non-cancellable sublease proceeds for the year ending January 31, 2021			$ 1,700
Minimum
Commitments And Contingencies [Line Items]
Operating lease expiration year			2,018
Capital lease term			3 years
Term of sublease arrangement			19 months
Non-cancellable sublease expiration year			2,018
Maximum
Commitments And Contingencies [Line Items]
Operating lease expiration year			2,029
Capital lease term			4 years
Term of sublease arrangement			49 months
Non-cancellable sublease expiration year			2,021

Commitments and Contingencies34

Commitments and Contingencies - Future Minimum Lease Payments under Non-cancellable Capital and Operating Leases (Details) $ in Thousands	Apr. 30, 2017USD ($)
Capital Leases
Capital Leases, Remainder of 2018	$ 12,603
Capital Leases, 2019	14,327
Capital Leases, 2020	8,828
Capital Leases, 2021	5,584
Capital Leases, 2022	302
Capital Leases, Total minimum lease payments	41,644
Capital Leases, Less: amount representing interest	(1,337)
Capital Leases, Present value of minimum lease payments	40,307
Operating Leases
Operating Leases, net of Sublease Income, Remainder of 2018	16,964
Operating Leases, net of Sublease Income, 2019	26,672
Operating Leases, net of Sublease Income, 2020	30,803
Operating Leases, net of Sublease Income, 2021	30,626
Operating Leases, net of Sublease Income, 2022	27,966
Operating Leases, net of Sublease Income, Thereafter	146,592
Operating Leases, net of Sublease Income, Total minimum lease payments	$ 279,623

Commitments and Contingencies35

Commitments and Contingencies - Future Payments under Non-cancellable Contractual Purchases (Details) $ in Thousands	Apr. 30, 2017USD ($)
Contractual Obligation Fiscal Year Maturity [Abstract]
Remainder of 2018	$ 7,653
2,019	16,887
2,020	15,000
Total	$ 39,540

Debt - Additional Information (

Debt - Additional Information (Details) - December Two Thousand Fifteen Facility - Revolving Credit Facility - Secured Debt - USD ($)	1 Months Ended	3 Months Ended
	Dec. 31, 2015	Apr. 30, 2017	Apr. 30, 2016
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 40,000,000
Debt instrument, description of variable rate basis		The December 2015 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%.
Line of credit facility, commitment fee percentage	0.20%
Line of credit facility, amount drawn	$ 40,000,000
Line of credit facility, interest rate	1.82%
Line of credit facility maturity date		Dec. 31, 2018
Line of credit facility, interest expense		$ 200,000	$ 200,000
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	1.25%
Minimum
Debt Instrument [Line Items]
Minimum deposit held as collateral for line of credit	$ 0
Minimum deposit amount with lender	$ 40,000,000
Minimum | Prime Rate
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	0.25%
Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	1.25%
Maximum | Prime Rate
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	2.75%
Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	3.75%

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Jan. 31, 2015	Jan. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Description of offering period excluding initial offering period	the offering period resets and the new lower price becomes the new offering price for a new 24 month offering period
Aggregate intrinsic value of exercised options	$ 6.6	$ 11.9
Aggregate estimated fair value of stock options granted to employees vested	$ 2.6	$ 5.7
Weighted-average grant date fair value of options granted to employees	$ 6.74	$ 5.25
Unrecognized stock-based compensation expense related to stock option	$ 20.3
Remaining weighted-average period	2 years 9 months 7 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining weighted-average period	2 years 11 months 23 days
Unrecognized stock-based compensation expense	$ 193.8
Unvested shares outstanding	13,974,193			11,822,316
Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested shares outstanding	2,874			5,842
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
2015 Equity Incentive Plan | Performance-Based Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate estimated fair value of stock options granted to employees vested	$ 3.1
Stock options granted	475,000
2015 Equity Incentive Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance	17,404,178		12,200,000
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance	2,969,790
Percentage of eligible compensation allowed to employees to purchase shares at a discount	15.00%
Description of offering period excluding initial offering period	Except for the initial offering period, the 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period consists of four six-month purchase periods.
Purchase price of common stock, percentage	85.00%
Unrecognized stock-based compensation expense	$ 9.6
Dividend yield	0.00%	0.00%
2015 Employee Stock Purchase Plan | Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining weighted-average period	5 months 23 days
Unrecognized stock-based compensation expense	$ 0.5
Issuance of common stock in connection with acquisition (in shares)			344,667
Weighted average grant date fair value, 2015 acquisition			$ 12.96
Unvested shares outstanding	145,737
2015 Employee Stock Purchase Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance			2,500,000
Vesting Commencement Per Year | 2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage	25.00%
Vesting Commencement Per Month
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage	2.08%
Vesting Commencement Per Quarter
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage	6.25%

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plans and Related Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Options Outstanding, Beginning balance | shares	12,318,800
Shares Subject to Options Outstanding, Options granted | shares	1,030,000
Shares Subject to Options Outstanding, Options exercised | shares	(531,910)
Shares Subject to Options Outstanding, Options forfeited/cancelled | shares	(65,575)
Shares Subject to Options Outstanding, Ending balance | shares	12,751,315
Shares Subject to Options Outstanding, Vested and expected to vest | shares	12,600,593
Shares Subject to Options Outstanding, Exercisable | shares	9,160,781
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 7.44
Weighted Average Exercise Price, Options granted | $ / shares	16.67
Weighted Average Exercise Price, Options exercised | $ / shares	4.62
Weighted Average Exercise Price, Options forfeited/cancelled | $ / shares	15.15
Weighted Average Exercise Price, Ending Balance | $ / shares	8.27
Weighted Average Exercise Price, Vested and expected to vest | $ / shares	8.19
Weighted Average Exercise Price, Exercisable | $ / shares	$ 5.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Life (Years)	6 years 6 months
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	6 years 5 months 20 days
Weighted Average Remaining Contractual Life (Years), Exercisable	5 years 8 months 8 days
Aggregate Intrinsic Value, Balance | $	$ 115,138
Aggregate Intrinsic Value, Vested and expected to vest | $	114,682
Aggregate Intrinsic Value, Exercisable | $	$ 104,276

Stock-Based Compensation - Su39

Stock-Based Compensation - Summary of Restricted Stock Unit and Awards Activity Under Equity Incentive Plans and Related Information (Details)	3 Months Ended
	Apr. 30, 2017$ / sharesshares
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Restricted Stock Units/Awards Outstanding, Unvested Beginning Balance | shares	11,822,316
Number of Restricted Stock Units/Awards Outstanding Granted | shares	3,782,656
Number of Restricted Stock Units/Awards Outstanding, Vested | shares	(792,847)
Number of Restricted Stock Units/Awards Outstanding, Forfeited/cancelled | shares	(837,932)
Number of Restricted Stock Units/Awards Outstanding Unvested Ending Balance | shares	13,974,193
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant Date Fair Value, Unvested Beginning Balance | $ / shares	$ 14.67
Weighted-Average Grant Date Fair Value, Granted | $ / shares	16.69
Weighted-Average Grant Date Fair Value, Vested | $ / shares	13.43
Weighted-Average Grant Date Fair Value, Forfeited/cancelled | $ / shares	14.11
Weighted-Average Grant Date Fair Value, Unvested Ending Balance | $ / shares	$ 15.32
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Restricted Stock Units/Awards Outstanding, Unvested Beginning Balance | shares	5,842
Number of Restricted Stock Units/Awards Outstanding, Vested | shares	(2,968)
Number of Restricted Stock Units/Awards Outstanding Unvested Ending Balance | shares	2,874
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant Date Fair Value, Unvested Beginning Balance | $ / shares	$ 11.86
Weighted-Average Grant Date Fair Value, Vested | $ / shares	17.67
Weighted-Average Grant Date Fair Value, Unvested Ending Balance | $ / shares	$ 5.85

Stock-Based Compensation - Su40

Stock-Based Compensation - Summary of Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 22,946	$ 16,089
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,468	1,512
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	9,160	6,524
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	7,740	5,230
General and Administrative Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 3,578	$ 2,823

Stock-Based Compensation - Su41

Stock-Based Compensation - Summary of Estimated Fair Value of Employee Stock Options (Details)	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, Minimum	0.90%	0.50%
Risk-free interest rate, Maximum	1.40%	0.90%
Volatility, Minimum	28.00%	46.00%
Volatility, Maximum	43.00%	60.00%
Dividend yield	0.00%	0.00%
Minimum | 2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	6 months
Maximum | 2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years	2 years
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 years	6 years
Risk-free interest rate		1.30%
Risk-free interest rate, Minimum	2.10%
Risk-free interest rate, Maximum	2.40%
Volatility		43.00%
Volatility, Minimum	39.00%
Volatility, Maximum	40.00%
Dividend yield	0.00%	0.00%

Net Loss per Share - Summary of

Net Loss per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Numerator:
Net loss	$ (40,086)	$ (38,575)
Denominator:
Weighted-average number of shares outstanding—basic and diluted	131,469	124,932
Net loss per share—basic and diluted	$ (0.30)	$ (0.31)
Class A Common Stock
Numerator:
Net loss	$ (22,061)	$ (13,632)
Denominator:
Weighted-average number of shares outstanding—basic and diluted	72,352	44,151
Net loss per share—basic and diluted	$ (0.30)	$ (0.31)
Class B Common Stock
Numerator:
Net loss	$ (18,025)	$ (24,943)
Denominator:
Weighted-average number of shares outstanding—basic and diluted	59,117	80,781
Net loss per share—basic and diluted	$ (0.30)	$ (0.31)

Net Loss per Share - Summary 43

Net Loss per Share - Summary of Weighted Average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share (Details) - shares shares in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	25,671	27,068
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10,534	14,919
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	12,650	8,534
Repurchasable shares from early-exercised options and unvested restricted stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	240	394
Contingently issuable common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	60	88
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,187	3,133

Segments - Additional Informati

Segments - Additional Information (Details)	3 Months Ended
	Apr. 30, 2017Segment
Segment Reporting [Abstract]
Number of operating segments	1