Hortonworks 10-K 15 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 07, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	HDP
Entity Registrant Name	Hortonworks, Inc.
Entity Central Index Key	1,610,532
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		77,923,970
Entity Public Float			$ 571.2

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 62,739	$ 53,332
Short-term investments	9,773	31,764
Accounts receivable, net of allowance of $26 as of December 31, 2016	112,013	82,368
Prepaid expenses and other current assets	10,809	4,831
Total current assets	195,334	172,295
Property and equipment, net	16,383	19,381
Long-term investments		4,084
Goodwill	34,333	34,333
Intangible assets, net	2,242	3,121
Other assets	1,559	1,306
Restricted cash	882	1,316
Total assets	250,733	235,836
Current liabilities:
Accounts payable	6,134	6,749
Accrued compensation and benefits	22,483	17,978
Accrued expenses and other current liabilities	10,948	11,752
Deferred revenue	194,901	129,840
Total current liabilities	234,466	166,319
Long-term deferred revenue	80,269	55,550
Other long-term liabilities	1,034	2,605
Total liabilities	315,769	224,474
Commitments and contingencies (Note 7)
Stockholders' (deficit) equity:
Preferred stock, par value of $0.0001 per share-25,000,000 shares authorized; none issued or outstanding as of December 31, 2017 and 2016
Common stock, par value of $0.0001 per share-500,000,000 shares authorized as of December 31, 2017 and December 31, 2016; 72,830,962 shares issued and 72,607,893 shares outstanding as of December 31, 2017 and 61,161,029 shares issued and 61,122,863 shares outstanding as of December 31, 2016	8	7
Additional paid-in capital	842,875	714,960
Accumulated other comprehensive loss	(219)	(1,063)
Accumulated deficit	(907,700)	(702,542)
Total stockholders' (deficit) equity	(65,036)	11,362
Total liabilities and stockholders' (deficit) equity	$ 250,733	$ 235,836

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts		$ 26
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	72,830,962	61,161,029
Common stock, shares outstanding	72,607,893	61,122,863

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Support subscription and professional services revenue:
Support subscription (including contra-revenue of $65 for the year ended December 31, 2015)	$ 198,935	$ 126,689	$ 77,728
Professional services	62,875	57,772	44,216
Total support subscription and professional services revenue (including $800, $2,638 and $10,053 for the years ended December 31, 2017, 2016 and 2015, respectively, from related parties-Note 14)	261,810	184,461	121,944
Cost of revenue:
Support subscription	30,741	23,030	13,705
Professional services	50,354	49,140	41,466
Total cost of revenue	81,095	72,170	55,171
Gross profit	180,715	112,291	66,773
Operating expenses:
Sales and marketing	200,188	183,542	133,052
Research and development	101,094	99,202	66,645
General and administrative	78,282	80,723	46,669
Total operating expenses	379,564	363,467	246,366
Loss from operations	(198,849)	(251,176)	(179,593)
Other (expense) income, net	(3,172)	712	908
Loss before income tax	(202,021)	(250,464)	(178,685)
Income tax expense	2,486	1,224	432
Net loss	$ (204,507)	$ (251,688)	$ (179,117)
Net loss per share of common stock, basic and diluted	$ (3.08)	$ (4.40)	$ (4.13)
Weighted-average shares used in computing net loss per share of common stock, basic and diluted	66,356,474	57,203,067	43,318,044

Consolidated Statements of Ope5

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Contra-support subscription revenue			$ 65
Support subscription and professional services revenue from related parties	$ 800	$ 2,638	$ 10,053

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (204,507)	$ (251,688)	$ (179,117)
Items of other comprehensive gain (loss):
Unrealized gain on investments, net of tax of $0 for all periods presented	30	34	1
Foreign currency translation adjustment	814	(551)	(345)
Total other comprehensive gain (loss)	844	(517)	(344)
Total comprehensive loss	$ (203,663)	$ (252,205)	$ (179,461)

Consolidated Statements of Com7

Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on investments, net of tax	$ 0	$ 0	$ 0

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' (Deficit) Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Common Stock [Member]RSUs [Member]	Common Stock [Member]Performance Shares [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member]RSUs [Member]	Accumulated Other Comprehensive (Loss) Gain [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2014	$ 167,070	$ 4			$ 439,005		$ (202)	$ (271,737)
Balance (in shares) at Dec. 31, 2014		40,987,583
Exercise of stock options and vesting of early exercised stock options	7,754	$ 1			7,753
Exercise of stock options and vesting of early exercised stock options, shares		3,325,707
Stock-based compensation expense	40,939				40,939
Shares issued from award vesting, shares			56,250
Issuance of common stock in connection with employee stock purchase plan	3,776				3,776
Issuance of common stock in connection with employee stock purchase plan, shares		219,600
Issuance of common stock in connection with acquisitions	27,593				27,593
Issuance of common stock in connection with acquisitions, shares		1,103,251
Issuance Costs	(80)				(80)
Other comprehensive (loss) gain	(344)						(344)
Net loss	(179,117)							(179,117)
Balance at Dec. 31, 2015	67,591	$ 5			518,986		(546)	(450,854)
Balance (in shares) at Dec. 31, 2015		45,692,391
Exercise of stock options and vesting of early exercised stock options	4,349				4,349
Exercise of stock options and vesting of early exercised stock options, shares		1,957,888
Stock-based compensation expense	98,823				98,823
Shares issued from award vesting, shares			2,561,364	120,474
Issuance of common stock in connection with employee stock purchase plan	5,631				5,631
Issuance of common stock in connection with employee stock purchase plan, shares		721,658
Shares vested in connection with prior year acquisition	0	$ 0			0		0	0
Shares vested in connection with prior year acquisition, shares		421,727
Issuance Costs					(4,351)
Follow-on public offering, net of issuance costs	87,693	$ 2			87,691
Follow-on public offering, shares		9,688,750
Repurchase of early exercised stock options	(46)				(46)
Repurchase of early exercised stock options, shares		(3,223)
Shares withheld related to tax withholdings	(474)				(474)
Shares withheld related to tax withholdings, shares		38,166
Other comprehensive (loss) gain	(517)						(517)
Net loss	(251,688)							(251,688)
Balance at Dec. 31, 2016	11,362	$ 7			714,960		(1,063)	(702,542)
Balance (in shares) at Dec. 31, 2016		61,122,863
Exercise of stock options and vesting of early exercised stock options	12,322				12,322
Exercise of stock options and vesting of early exercised stock options, shares		2,297,387
Stock-based compensation expense	110,036				110,036
Shares issued from award vesting			$ 1			$ (1)
Shares issued from award vesting, shares			7,919,416	183,048
Issuance of common stock in connection with employee stock purchase plan	7,397				7,397
Issuance of common stock in connection with employee stock purchase plan, shares		1,132,166
Shares vested in connection with prior year acquisition	0	$ 0			0		0	0
Shares vested in connection with prior year acquisition, shares		137,916
Shares withheld related to tax withholdings	(2,666)				(2,666)
Shares withheld related to tax withholdings, shares		(184,903)
Proceeds from the disgorgement of short-swing profit	176				176
Cumulative adjustment to accumulated deficit upon adoption of Accounting Standards Update 2016-09					651			(651)
Other comprehensive (loss) gain	844						844
Net loss	(204,507)							(204,507)
Balance at Dec. 31, 2017	$ (65,036)	$ 8			$ 842,875		$ (219)	$ (907,700)
Balance (in shares) at Dec. 31, 2017		72,607,893

Consolidated Statements of Sto9

Consolidated Statements of Stockholders' (Deficit) Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Issuance cost		$ 80
Additional Paid-In Capital [Member]
Issuance cost	$ 4,351	$ 80

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (204,507)	$ (251,688)	$ (179,117)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	8,786	7,244	4,499
Amortization of premiums from investments	308	856	949
Amortization of intangible assets	879	881	393
Impairment of promissory note and related interest receivable		2,683
Loss on disposal of assets			522
Deferred income taxes	(330)	27	(140)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	1,802	(335)	60
Loss on early exit of lease	349
Provision for losses on accounts receivable	176	514	20
Other	333	(43)	(66)
Changes in operating assets and liabilities:
Accounts receivable	(26,885)	(29,584)	(21,629)
Prepaid expenses and other current assets	(5,294)	29	(1,519)
Other assets	(1,035)	(464)	(580)
Accounts payable	(767)	1,773	1,648
Accrued expenses and other current liabilities	(1,151)	2,334	6,154
Accrued compensation and benefits	3,978	5,630	2,801
Deferred revenue	84,564	79,493	44,381
Other long-term liabilities	(992)	(613)	1,349
Net cash used in operating activities	(29,750)	(82,440)	(99,336)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investments	(7,069)	(80,519)	(102,631)
Proceeds from sales of investments		13,156
Proceeds from maturities of investments	32,865	89,248	118,510
Purchases of property and equipment	(5,223)	(12,781)	(12,839)
Acquisitions, net			(3,541)
Issuance of promissory note receivable			(2,500)
Change in restricted cash	437	(11)	31
Net cash provided by (used in) investing activities	21,010	9,093	(2,970)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	19,464	9,466	10,417
Repurchase of unvested shares and tax withholding shares	(2,666)	(520)
Proceeds from the disgorgement of short-swing profit	176
Payment of contingent consideration related to an acquisition		(1,625)
Payments of acquisition-related liabilities		(3,526)
Payments of capital lease liability	(396)	(172)	(170)
Payment of fees for line of credit	(79)	(243)
Proceeds from follow-on public offering, net of issuance costs		88,153
Payments for deferred offering costs			(835)
Net cash provided by financing activities	16,499	91,533	9,412
Effect of exchange rate changes on cash and cash equivalents	1,648	(602)	(442)
Net increase (decrease) in cash and cash equivalents	9,407	17,584	(93,336)
Cash and cash equivalents-Beginning of period	53,332	35,748	129,084
Cash and cash equivalents-End of period	62,739	53,332	35,748
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	1,378	1,074	330
Cash paid for interest	377	52	14
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Fair value of shares issued in connection with acquisitions			27,593
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities	172	10	1,337
Equipment acquired through capital lease		682
Prepaid offering fees		(460)
Employee and Non-Employee [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	$ 110,036	$ 98,823	$ 40,939

Organization and Description of

Organization and Description of Business	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	1. ORGANIZATION AND DESCRIPTION OF BUSINESS Hortonworks, Inc. (the “Company”) delivers 100 percent open-source global data management solutions so that customers can deploy modern data architectures and realize the full value of their data. The Company’s enterprise-ready solutions enable organizations to govern, secure and manage data of any kind, wherever it is located, and turn it into actionable intelligence that will help them transform their businesses. The Company’s platforms allow enterprises to manage their data on a global scale, whether it is data-in-motion data-at-rest. In December 2014, the Company completed its initial public offering and concurrent private placement (collectively, the “IPO”). In February 2016, the Company completed a follow-on

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Consolidation The consolidated financial statements have been prepared in accordance with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, and expenses, the related disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of expenses during the reporting period. The Company bases its estimates and judgments on its historical experience, knowledge of current conditions and its beliefs regarding what may occur in the future given available information. Estimates, assumptions and judgments are used for, but are not limited to, revenue recognition, stock-based awards, accounting for income taxes, allowance for doubtful accounts, valuation and determination of other-than-temporary impairments of notes receivable and certain accrued liabilities. Actual results may differ from these estimates. Concentration of Risk Credit Risk Financial instruments, which potentially subject the Company to concentration of credit risk, consist primarily of cash and cash equivalents and investments. The Company places its cash and cash equivalents with major financial institutions, which management assesses to be of high-credit quality. The Company’s investment policies limit investments to those that are investment grade, liquid securities and restricts placement of these investments to issuers evaluated as creditworthy. Concentration of Revenue and Accounts Receivable The Company generally does not require collateral or other security in support of accounts receivable. Allowances are provided for individual accounts receivable when the Company becomes aware of a customer’s inability to meet its financial obligations, such as in the case of bankruptcy, deterioration in the customer’s operating results or change in financial position. If circumstances related to customers change, estimates of the recoverability of receivables would be further adjusted. The Company also considers broad factors in evaluating the sufficiency of its allowances for doubtful accounts, including the length of time receivables are past due, significant one-time Significant customers are those which represent 10 percent or more of the Company’s total revenue or gross accounts receivable balance for each respective consolidated statement of operations and consolidated balance sheet period. For the years ended December 31, 2017, 2016 and 2015, there were no customers that represented 10 percent or more of the Company’s total revenue. As of both December 31, 2017 and 2016, there were no customers that represented 10 percent or more of the Company’s gross accounts receivable balance. Cash and Cash Equivalents Cash and cash equivalents consist of cash, money market funds, U.S. Treasury bills, commercial paper, and corporate notes and bonds with original maturities of three months or less at the time of purchase. Operating cash deposits held with banks may exceed the amount of insurance provided on such deposits. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions with reputable credit and therefore bear minimal credit risk. The Company seeks to mitigate its credit risk by spreading such risk across multiple counterparties and monitoring the risk profiles of these counterparties. Investments The Company classifies its debt securities as “trading,” “available-for-sale” “held-to-maturity,” available-for-sale Available-for-sale Available-for-sale Fair Value Measurement Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal market (or most advantageous market, in the absence of a principal market) for the asset or liability in an orderly transaction between market participants at the measurement date. Further, entities are required to maximize the use of observable inputs and minimize the use of unobservable inputs in measuring fair value, and to utilize a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The three levels of inputs used to measure fair value are as follows: Level 1 Level 2 Level 3 Restricted Cash Restricted cash includes collateral used to secure a credit card, and may not be used or transferred until the restriction is released by the issuing bank. Restricted cash also includes amounts to secure letters of credit issued in lieu of deposits on office space. Software Development Costs The Company develops open source software that is generally freely available on the Apache Hadoop platform. Capitalization of software development costs begins upon the establishment of technological feasibility and ceases when the product is available for general release. There is usually a very minimal passage of time between the achievement of technological feasibility and the availability of the Company’s software for general release. Accordingly, there are no capitalized software development costs for the years ended December 31, 2017 and 2016. Internal Use Software The Company’s capitalized internal use software costs were not material for the years ended December 31, 2017 and 2016. Property and Equipment Property and equipment are stated at cost. Depreciation is computed using a straight-line method over the estimated useful lives, determined to be two years for purchased software, two to three years for computer equipment, and five years for network and communication equipment and furniture and fixtures. Expenditures for repairs and maintenance are charged to expenses as incurred. Leasehold improvements are amortized on a straight-line basis over the term of the lease, or the useful life of the assets, whichever is shorter. Goodwill and Long-Lived Assets Goodwill is tested for impairment on an annual basis and between annual tests if events or circumstances indicate that an impairment loss may have occurred. The test is based on a comparison of the reporting unit’s book value to its estimated fair market value. The annual impairment test is performed by the Company during the fourth quarter of each fiscal year using the opening consolidated balance sheet as of the first day of the fourth quarter, with any resulting impairment recorded in the fourth quarter of the fiscal year. During the year ended December 31, 2017, the Company determined that the fair value of its sole reporting unit exceeded its carrying value, and as a result, no goodwill impairment was recorded in fiscal 2017. Since the Company’s inception, goodwill has not been impaired. Long-lived assets (including property and equipment) are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. In such instances, the recoverability of assets to be held and used is measured first by a comparison of the carrying amounts of the assets or asset groups to future undiscounted net cash flows expected to be generated by the assets or asset groups. If such assets or asset groups are considered to be impaired, an impairment loss would be recognized if the carrying amount of the assets or asset groups exceeds the fair value of the assets or asset groups. During the year ended December 31, 2016, the Company recognized an impairment charge of $2.7 million in operating expenses due to a promissory note and related interest receivable. During the year ended December 31, 2016, the Company determined that it is probable that the promissory note and related interest receivable are unrecoverable due to our estimate of the third-party service provider’s illiquidity and unfavorable rate of cash use. Revenue Recognition Apache Hadoop, Apache NiFi and associated open source technology projects within the Apache Software Foundation are made freely available within the open source community. While these technologies have emerged to enable the modern data center architecture, they are complex to deploy and consume as individual components inhibiting broad adoption by enterprises. The Company’s efforts are thus focused on creating a software distribution of these projects by assembling key component software projects into an open platform that address the needs of enterprises. By working in concert with the Apache community to develop Connected Data Platforms, Hortonworks Data Platform (“HDP”), Hortonworks DataFlow (“HDF”) and other offerings, the Company’s software distribution provides customers with a scalable, secure and governed environment for their data requirements. Connected Data Platforms are made available under an Apache open source license. Open source software is an alternative to proprietary developed software and represents a different model for the development and licensing of commercial software code than that typically used for proprietary software. Because open source software code is generally freely shared, the Company does not typically generate any direct revenue from its software development activities. The Company generates the predominant amount of its revenue through support (support subscription) and consulting and education services (professional services) arrangements with its enterprise customers. The Company’s professional services provide assistance in the implementation process and education related activities. The Company prices support subscription offerings based on the number of servers in a cluster, or nodes, core or edge devices, data under management and/or the scope of support provided. The Company’s consulting services are priced primarily on a time and materials basis, and to a lesser extent, a fixed fee basis, and education services are priced based on attendance. Under the Company’s support subscription and professional services arrangements, revenue is recognized when (i) persuasive evidence of an arrangement exists; (ii) the services have been delivered; (iii) the arrangement fee is fixed or determinable; and (iv) collectability is probable. Support Subscription Revenue In single-element arrangements, support subscription fees are recognized on a ratable basis over the support subscription term. The Company’s support subscription arrangements do not typically contain refund provisions for fees earned related to support services performed. Professional Services Revenue Professional services revenue is derived from customer fees for consulting services engagements and education services. The Company’s consulting services are provided primarily on a time and materials basis and, to a lesser extent, a fixed fee basis, and education services are priced based on attendance. Revenue from professional services, when such services are sold in single-element arrangements, is recognized as the services are performed. Multiple-Element Arrangements The Company’s multiple-element arrangements generally include support subscription combined with professional services. The Company has not established vendor-specific objective evidence of fair value (“VSOE”) for its support subscriptions and professional services offerings, and the Company recognizes revenue on a ratable basis over the period beginning when both the support subscription and professional services have substantially commenced, and ending at the conclusion of the support subscription or professional services period, whichever is longer. Under the Company’s multiple-element arrangements, the support subscription element generally has the longest service period and the professional services element is performed during the earlier part of the support subscription period. On occasion, the Company may sell engineering services and/or a premium subscription agreement that provides a customer with development input and the opportunity to work more closely with its developers. The Company’s agreements with customers often include multiple support subscription and/or professional services elements, and these elements are sometimes included in separate contracts. The Company considers an entire customer arrangement to determine if separate contracts should be considered linked arrangements for the purposes of revenue recognition. Revenue recognition requires judgment, including whether a software arrangement includes multiple elements, and if so, whether VSOE exists for those elements. A portion of revenue may be recorded as unearned due to undelivered elements. Changes to the elements in a software arrangement, the ability to identify the VSOE for those elements and the VSOE of all respective elements could materially impact the amount of earned and unearned revenue in a given period. Revenue from Strategic Relationships and Reseller Arrangements The Company has strategic relationships and reseller arrangements with third parties (collectively, “Partners”). Under these arrangements, the Company is not the primary obligor for what is ultimately sold by the Partners to their end customers. The amount recognized as revenue from sales to end users represents the amount due to the Company from the Partners and is generally recognized on a ratable basis over the applicable services term under support subscription revenue. Deferred Revenue Deferred revenue consists of amounts billed to customers but not yet recognized in revenue. As of December 31, 2017 and 2016, substantially all of the Company’s accounts receivable represents amounts billed to customers but not yet received or recognized as revenue and are thus recorded as deferred revenue. Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on the assessment of the collectability of accounts. The Company regularly reviews the adequacy of the allowance for doubtful accounts by considering the age of each outstanding invoice and the collection history of each customer to determine whether a specific allowance is appropriate. When deemed uncollectable, accounts receivable are reserved via the allowance for doubtful accounts and charged against bad debt expense or the related deferred revenue, as applicable. Cost of Revenue Cost of support subscription revenue consists primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for employees, including support engineers, associated with the Company’s support subscription offerings mainly related to technology support and allocated shared costs. Cost of professional services revenue consists primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for employees and fees to subcontractors associated with the Company’s professional service contracts, travel costs and allocated shared costs. The Company allocates shared costs such as rent, information technology and employee benefits to all departments based on headcount. As such, allocated shared costs are reflected in cost of revenue and each operating expense category. Cost of revenue for support subscription and professional services is expensed as incurred. Sales and Marketing Expenses Sales and marketing expenses consist primarily of personnel costs (including cash compensation, commissions, benefits and stock-based compensation expense) for the Company’s sales and marketing employees. In addition, sales and marketing expense include the cost of advertising, online marketing, promotional events, corporate communications, product marketing, other brand-building activities, plus allocated shared costs. All costs of advertising, including cooperative marketing arrangements, are expensed as incurred. Advertising expense totaled $8.9 million, $9.1 million and $11.1 million for the years ended December 31, 2017, 2016 and 2015, respectively. Research and Development Expenses Research and development expenses consist primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for the Company’s research and development employees, costs associated with subcontractors and equipment lease expenses, plus allocated shared costs. The Company’s research and development expenses include costs for development related to the distribution of its solutions, including security updates, fixes, functionality enhancements, upgrades to the technology and new versions of the software, quality assurance personnel, technical documentation personnel and at times, expenses related to engineering resources for its subscription and professional services offerings. General and Administrative Expenses General and administrative expenses consist primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for our executive, finance, human resources, information technology, legal and other administrative employees. In addition, general and administrative expenses include fees for third-party professional services, including consulting, accounting and legal services and other corporate expenses and allocated overhead. Stock-Based Compensation Expense The Company recognizes compensation costs related to employee stock options, time-based restricted stock units (“RSUs”), performance-based restricted stock units (“PSUs”), restricted stock awards and participation in the Company’s 2014 Employee Stock Purchase Plan, as amended (“ESPP”), based on the estimated fair value of each award on the grant date and forfeitures as they occur beginning on January 1, 2017. The Company estimates the grant date fair value of options using the Black-Scholes option pricing model. The Company estimates the grant date fair value of RSUs and PSUs that are not market-based using the closing market price of the Company’s common stock on the grant date. The Company estimates the grant date fair value of market-based PSUs with pre-established The Company recognizes compensation costs related to restricted stock granted in connection with an acquisition based upon the fair market value of the underlying shares of common stock on the grant date, which is generally considered to be the closing date of the acquisition. The Company recognizes compensation costs related to stock options and RSUs issued to non-employees based to non-employees are PSUs allow the recipients of such awards to earn fully vested shares of the Company’s common stock upon the achievement of pre-established performance Income Taxes The Company accounts for income taxes using an asset and liability approach. Deferred income tax assets and liabilities are computed for differences between the financial statement and income tax basis of assets and liabilities that will result in taxable or deductible amounts in the future. Such deferred income tax asset and liability computations are based on enacted tax laws and rates applicable to periods in which the differences are expected to affect taxable income. A valuation allowance is established, when necessary, for any portion of deferred income tax assets where it is considered more likely than not that it will not be realized. The tax effects of the Company’s income tax positions are recognized only if determined “more likely than not” to be sustained based solely on the technical merits as of the reporting date. The Company considers many factors when evaluating and estimating its tax positions and tax benefits, which may require periodic adjustments and which may not accurately anticipate actual outcomes. The Company accounts for excess tax benefits and tax deficiencies as income tax expense or benefit, treated as discrete items in the reporting period in which they occur, and recognizes previously unrecognized deferred tax assets that arose directly from (or the use of which was postponed by) tax deductions related to equity compensation in excess of compensation recognized for financial reporting. Foreign Currency The remeasurement of foreign currencies creates remeasurement adjustments that are included in the consolidated statements of operations. For the year ended December 31, 2017, the net loss from remeasurement adjustments was $3.1 million. For the years ended December 31, 2016 and 2015, the net gains from remeasurement adjustments were immaterial. For subsidiaries with non-U.S. Net Loss Per Share of Common Stock Basic net loss per share of common stock is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period, less restricted common stock and common stock issued that is subject to repurchase, and excludes any dilutive effects of share-based awards. Diluted net loss per share of common stock is the same as basic net loss per share of common stock, because the effects of potentially dilutive securities are anti-dilutive. Recently Issued Accounting Pronouncements In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting, ASU 2017-09 will In January 2017, FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ASU 2017-04 will In January 2017, FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, ASU 2017-01 will In November 2016, FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash 2016-18 In August 2016, FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments 2016-15 In February 2016, FASB issued ASU No. 2016-02, Leases (Topic 842), right-of-use 2016-02 In May 2014, FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) In August 2015, FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of Effective Date • ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606) Narrow-Scope Improvements and Practical Expedients ASU 2016-12 amends measuring non-cash consideration, • ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ASU 2016-10 addresses • ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ASU 2016-08 requires The new standard permits adoption either by using (i) a full retrospective approach for all periods presented or (ii) a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures. The Company adopted the new standard as of January 1, 2018 using the modified retrospective approach. The Company’s decision was based on a number of factors such as the significance of the impact of the new standard on the Company’s financial results, system readiness, including that of software procured from third-party providers, and the Company’s ability to accumulate and analyze the information necessary to assess the cumulative effect of the new standard through January 1, 2018. The Company has substantially completed its evaluation of the impact of the new standard on its accounting policies, processes and system requirements. The Company has assigned internal resources in addition to the engagement of third-party service providers to assist in the evaluation and to provide periodic updates to management and the Audit Committee. In evaluating the risks associated with the adoption of the new accounting standard, the Company has identified and scoped the different revenue streams and reviewed contracts in each revenue stream for terms and conditions that could result in different accounting treatment. Furthermore, the Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new standard. While the Company continues to assess all potential impacts under the new standard, significant impacts are expected to the timing and amount of support subscription and professional services revenue recognized, as well as the capitalization and amortization of contract acquisition costs. In addition, the Company will update certain disclosures, as applicable, included in its filings pursuant to the Securities Exchange Act of 1934, as amended, to meet the requirements of the new standard. Under current industry-specific software revenue recognition guidance, the Company has concluded it has not established VSOE for support subscriptions and professional services offerings in multiple-element arrangements where support subscriptions are sold with professional services. The Company recognizes revenue on a ratable basis over the period beginning when both the support subscription and professional services have substantially commenced, and ending at the conclusion of the support subscription or professional services period, whichever is longer. The new standard, which does not retain the concept of VSOE, requires an evaluation of whether support subscriptions and professional services are distinct performance obligations, and therefore should be separately recognized as the respective performance obligations are satisfied based on the standalone selling price for each performance obligation, which may not be on a ratable basis. Based on the Company’s evaluation under the new standard, the timing of revenue recognition will change significantly for professional services bundled in multiple-element arrangements and currently recognized ratably due to lack of VSOE for support subscriptions. In particular, professional services revenue will be recognized in an earlier period and over a shorter timeframe under the new standard as the services are delivered compared to the Company’s current accounting policy under the existing standards and guidance. Also, the timing of recognition will change to begin in an earlier period for some support subscriptions bundled in multiple-element arrangements compared to the Company’s current accounting policy for multiple-element arrangements whereby recognition generally begins when both the support subscription and professional services have substantially commenced. As part of its evaluation, the Company has also considered the impact of the guidance in Accounting Standards Codification (“ASC”) 340-40 , Other Assets and Deferred Costs; Contracts with Customers e.g. The Company adopted the new standard effective January 1, 2018, by recognizing the cumulative effect of initially applying the new standard. As a result of adopting ASU 2014-09 (Topic 606) 340-40, Recently Adopted Accounting Pronouncements In March 2016, FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting and non-public entities, Prior to January 1, 2017, the Company recognized the excess tax benefits of stock-based compensation expense as additional paid-in capital, additional paid-in capital paid-in Effective as of January 1, 2017, the Company adopted a change in accounting policy in accordance with the standard to account for excess tax benefits and tax deficiencies as income tax expense or benefit, treated as discrete items in the reporting period in which they occur, and to recognize previously unrecognized deferred tax assets that arose directly from (or the use of which was postponed by) tax deductions related to equity compensation in excess of compensation recognized for financial reporting. The change was applied on a modified retrospective basis; no prior periods were restated as a result of this change in accounting policy. The standard also eliminates the requirement that excess tax benefits be realized as a reduction in current taxes payable before the associated tax benefit can be recognized as an increase in additional paid-in no tax-related cumulative-effect

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. FAIR VALUE MEASUREMENTS The following table summarizes the investments in available-for-sale December 31, 2017 Gross Gross Gross Estimated U.S. Treasury bills $ 8,612 $ 4 $ — $ 8,616 Certificates of deposit 750 — — 750 Commercial paper 3,498 — (1 ) 3,497 Corporate notes and bonds 5,806 — (1 ) 5,805 Total investments in available-for-sale securities $ 18,666 $ 4 $ (2 ) $ 18,668 December 31, 2016 Gross Gross Gross Estimated U.S. government securities $ 2,072 $ — $ — $ 2,072 Certificates of deposit 960 — — 960 Commercial paper 2,497 — — 2,497 Corporate notes and bonds 30,347 4 (32 ) 30,319 Total investments in available-for-sale securities $ 35,876 $ 4 $ (32 ) $ 35,848 The contractual maturities of investments in available-for-sale December 31, 2017 2016 Gross Fair Value Gross Fair Value Due within one year $ 18,666 $ 18,668 $ 31,792 $ 31,764 Due after one year through five years — — 4,084 4,084 Total investments in available-for-sale $ 18,666 $ 18,668 $ 35,876 $ 35,848 The following table sets forth the fair value of the Company’s financial assets measured on a recurring basis by level within the fair value hierarchy (in thousands): December 31, 2017 Level 1 Level 2 Total Cash equivalents: Money market funds $ 25,947 $ — $ 25,947 U.S. Treasury bills 3,599 — 3,599 Commercial paper — 3,497 3,497 Corporate notes and bonds — 1,799 1,799 Short-term investments: U.S. Treasury bills 5,017 — 5,017 Certificates of deposit — 750 750 Corporate notes and bonds — 4,006 4,006 Total financial assets $ 34,563 $ 10,052 $ 44,615 December 31, 2016 Level 1 Level 2 Total Cash equivalents: Money market funds $ 24,533 $ — $ 24,533 Short-term investments: U.S. government securities — 2,072 2,072 Certificates of deposit — 960 960 Commercial paper — 2,497 2,497 Corporate notes and bonds — 26,235 26,235 Long-term investments: Corporate notes and bonds — 4,084 4,084 Total financial assets $ 24,533 $ 35,848 $ 60,381 Where applicable, the Company uses quoted market prices in active markets for identical assets to determine fair value. This pricing methodology applies to Level 1 investments, which are composed of money market funds and U.S. Treasury bills. If quoted prices in active markets for identical assets are not available, then the Company uses quoted prices for similar assets or inputs other than quoted prices that are observable, either directly or indirectly. These investments are included in Level 2 and consist of U.S. government securities, certificates of deposit, commercial paper and corporate notes and bonds. Commercial paper is valued using market prices, if available, adjusting for accretion of the purchase price to face value at maturity. The carrying amounts of accounts receivable, prepaid expenses and other current assets, accounts payable, accrued compensation and benefits and accrued expenses and other current liabilities approximate fair value. In certain cases, where there is limited activity or less transparency around inputs to valuation, securities are classified as Level 3 within the valuation hierarchy. The Company entered into a three-year, $2.5 million promissory note receivable with a third-party service provider in February 2015, which bears interest at four percent per annum. The promissory note receivable was valued on a non-recurring held-to-maturity A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. During the years ended December 31, 2017 and 2016, the Company did not make any transfers between Level 1 and Level 2 investments. As of December 31, 2017 and 2016, the Company did not have any Level 3 financial assets or liabilities. Gross unrealized gains and losses were not material as of December 31, 2017 and 2016. Realized gains and losses were not material for the years ended December 31, 2017, 2016 and 2015. As of December 31, 2017 and 2016, there were no securities that were in an unrealized loss position for more than 12 months.

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Combinations	4. BUSINESS COMBINATIONS Transactions completed in 2017 and 2016 The Company did not complete any acquisitions during the years ended December 31, 2017 and 2016. Transactions completed in 2015 Onyara, Inc. The acquisition date fair value of the purchase consideration was $26.5 million, which included the following (in thousands): Common stock (921,643 shares at fair value of $23.76 per share) $ 21,898 Holdback of 194,259 shares of common stock for a period of 12 months for general representations and warranties 4,616 Total $ 26,514 The total purchase consideration of $26.5 million exceeded the estimated fair value of the net tangible and identifiable intangible assets and liabilities acquired. Prior to the acquisition, Apache NiFi was open sourced in November 2014 as part of the National Security Agency Technology Transfer Program. As a result, no technology was acquired and the Company recorded goodwill of $26.4 million in connection with this transaction. The goodwill is attributable to the synergies expected from combining Onyara’s operations with the Company’s operations. The goodwill is not deductible for tax purposes. Under the terms of the agreement, all outstanding shares of Onyara’s capital stock, options to purchase Onyara capital stock and any other securities convertible into, exercisable for or exchangeable for shares of Onyara capital were canceled in exchange for an aggregate of approximately 1.6 million shares of the Company’s common stock with a fair value of approximately $38.5 million. Of these shares, 1.1 million shares with a fair value of approximately $26.5 million were allocated to purchase consideration. The remaining 0.5 million shares with a fair value of approximately $12.0 million were considered post-combination remuneration which will be recorded as stock-based compensation expense over the vesting period of up to three years. The vesting of these RSUs is contingent upon continued employment. The related acquisition costs, consisting primarily of legal expenses in the amount of $0.4 million during the year ended December 31, 2015, were expensed as incurred. The following table summarizes the allocation of the consideration paid of approximately $26.5 million to the fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands): Goodwill $ 26,429 Cash 180 Tangible liabilities acquired (95 ) Total $ 26,514 In connection with the acquisition, the Company also issued RSUs covering 0.2 million shares of the Company’s common stock with a fair value of approximately $5.2 million, which is being recognized as stock-based compensation expense as the RSUs vest over three years. The vesting of these RSUs is contingent upon continued employment. As such, the Company will account for such payments as post-combination remuneration, to be recognized in operating expenses in the consolidated statements of operations as the services are performed. The results of operations of Onyara have been included in the Company’s consolidated statements of operations from the acquisition date. SequenceIQ. on-demand on-premises The acquisition of SequenceIQ was accounted for as the purchase of a business. The related acquisition costs, consisting primarily of consulting and legal expenses, were not material during the year ended December 31, 2015 and were expensed as incurred. The acquisition date fair value of the purchase consideration was $10.0 million, which included the following (in thousands): Cash $ 3,721 Cash holdback for a period of 15 months for general representations and warranties 1,875 Cash payable upon 18-month 1,651 Contingent consideration 1,625 Vested RSUs (49,102 shares at fair value of $21.97 per share) 1,079 Total $ 9,951 The Company estimated the acquisition date fair value of the contingent consideration payable of $1.6 million based on various estimates including a discount rate based on the estimated timing of achievement of product milestones, the probability of achievement and other factors, all of which the Company believes are appropriate and representative of market participant assumptions. Upon the achievement of product milestones in January 2016, the Company paid the fair value of the contingent consideration liability of $1.7 million. The Company also issued to the selling shareholders RSUs covering 114,583 shares of the Company’s common stock that vest over a period of up to three years. The vesting of the additional RSUs is contingent upon the continued employment of the selling shareholders that were retained as employees. As such, the Company accounted for such payments as post-combination remuneration, to be recognized in operating expenses in the consolidated statements of operations as the services are performed. The acquisition of SequenceIQ provided the Company with developed technology. The Company determined that the fair value of the developed technology was approximately $4.4 million using the cost approach. The cost approach reflects the amount that would be required at the acquisition date to replace the service capacity of an asset. The assumptions underlying the fair value calculation include: the labor required using a burdened overhead rate, the development period, a developer’s profit based on the operating profitability of market participants and the opportunity cost based on the estimated required return on investment over the development period using venture capital rates of return and private capital rates of return for enterprises at a similar stage of development as SequenceIQ. A deferred tax liability related to the fair value of the developed technology obtained in the acquisition was also recognized. The Company recognized goodwill of $5.8 million equal to the excess of the purchase consideration over the fair value of the assets acquired and the liabilities assumed inclusive of approximately $0.4 million related to a deferred tax liability recognized in the acquisition. The goodwill is attributable to the synergies expected from combining SequenceIQ’s operations with the Company’s operations. The goodwill is not deductible for tax purposes. The following table summarizes the allocation of the consideration paid of approximately $10.0 million to the fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands): Tangible assets acquired, net $ 191 Developed technology 4,395 Goodwill 5,785 Deferred tax liabilities, net (420 ) Total $ 9,951 The results of operations of SequenceIQ have been included in the Company’s consolidated statements of operations from the acquisition date. The Company’s business combinations completed during the year ended December 31, 2015 did not have a material impact on the Company’s consolidated financial statements and therefore, actual and pro forma disclosures have not been presented.

Property and Equipment, Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	5. PROPERTY AND EQUIPMENT, NET Property and equipment, net, consisted of the following (in thousands): December 31, 2017 2016 Computer equipment $ 13,353 $ 12,513 Network and communication equipment 4,889 3,453 Purchased software 898 667 Furniture and fixtures 5,356 4,585 Capital leases 743 476 Leasehold improvements 12,003 10,871 Assets not yet in use 198 206 Property and equipment, gross 37,440 32,771 Less: Accumulated depreciation (21,057 ) (13,390 ) Total property and equipment, net $ 16,383 $ 19,381 Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $8.8 million, $7.2 million and $4.5 million, respectively. Interest expense related to capital leases was immaterial for the years ended December 31, 2017, 2016 and 2015. As of December 31, 2017, the Company is obligated to make future payments under capital leases of $0.4 million in 2018.

Intangible Assets, Net

Intangible Assets, Net	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	6. INTANGIBLE ASSETS, NET The following table summarizes the Company’s intangible assets, net (in thousands): December 31, 2017 Gross Carrying Accumulated Net Developed technology $ 4,395 $ (2,153 ) $ 2,242 Intangible assets, net $ 4,395 $ (2,153 ) $ 2,242 December 31, 2016 Gross Carrying Accumulated Net Developed technology $ 4,395 $ (1,274 ) $ 3,121 Intangible assets, net $ 4,395 $ (1,274 ) $ 3,121 The Company’s intangible assets as of December 31, 2017 and 2016 were comprised entirely of developed technology from the Company’s acquisition of SequenceIQ. The amortizable intangible assets have a useful life of five years. For the years ended December 31, 2017, 2016 and 2015, the Company recognized amortization expense for intangible assets of $0.9 million, $0.9 million and $0.4 million, respectively, in research and development expenses. Based on the current amount of intangibles subject to amortization, the estimated amortization expense for each of the succeeding 12-month

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. COMMITMENTS AND CONTINGENCIES Operating Leases The Company has many operating lease agreements primarily involving office space facilities. These leases are non-cancelable non-cancelable As of December 31, 2017, future minimum lease commitments under non-cancelable Years Ending December 31, Leases 2018 $ 5,942 2019 2,741 2020 1,702 2021 1,097 2022 429 Thereafter 3,735 Gross lease payments 15,646 Less: Non-cancelable (604 ) Net lease payments $ 15,042 Rent expense incurred under operating leases for the years ended December 31, 2017, 2016 and 2015 was $9.0 million, $9.9 million and $8.0 million, respectively. Legal Proceedings From time to time, the Company is party to various litigation and administrative proceedings relating to claims arising from its operations in the normal course of business. Based on the information presently available, including discussion with legal counsel, management believes that resolution of these matters will not have a material effect on the Company’s business, results of operations, financial condition or cash flows. On February 29, 2016, a putative class action lawsuit alleging violations of federal securities laws was filed in the U.S. District Court for the Northern District of California, captioned Monachelli v. Hortonworks, Inc No. 3:16-cv-00980-SI. The On April 13, 2017, a derivative action was filed in the Court of Chancery of the State of Delaware, captioned Steinberg v. Bearden, et al. 2017-0286-AGB,

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	8. DEBT Amended and Restated Revolving Credit Agreement On November 2, 2016, the Company entered into a $30.0 million senior secured revolving credit facility (the “Original Credit Agreement”) with Silicon Valley Bank (the “Bank”), and on November 1, 2017, the Company amended its Original Credit Agreement to increase its borrowing capacity to $50.0 million, documented as an amendment and restatement of its two-year The Amended and Restated Credit Agreement contains customary negative covenants and certain financial covenants that require the Company to maintain a minimum trailing 12-month non-GAAP As of December 31, 2017, the Company had no borrowings outstanding under the Amended and Restated Credit Agreement and was in compliance with all financial covenants.

Stockholders' (Deficit) Equity

Stockholders' (Deficit) Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Stockholders' (Deficit) Equity	9. STOCKHOLDERS’ (DEFICIT) EQUITY Common Stock Each share of common stock is entitled to one vote for matters to be voted on by the stockholders of the Company. The holders of common stock are also entitled to receive dividends whenever declared by the Board of Directors from legally available funds. The Company has not paid a dividend since its inception, and has no current plans to do so. Common Stock Reserved for Issuance The Company reserved shares of common stock, on an as-if December 31, 2017 2016 Common stock warrants 3,250,000 3,250,000 Exercise and conversion of common stock warrants 476,368 476,368 Common stock subject to repurchase 10,500 30,708 Outstanding stock options 4,490,445 7,430,094 Unvested restricted stock 137,919 275,835 Unvested RSUs 9,579,841 10,836,508 Unvested PSUs 839,857 424,503 Shares available for issuance under Amended 2014 Stock Option and Incentive Plan 706,994 4,234,205 Shares available for purchase under Amended 2014 Employee Stock Purchase Plan 1,933,343 2,451,215 Total 21,425,267 29,409,436 2011 Stock Option and Grant Plan The Company adopted the Hortonworks, Inc. 2011 Stock Option and Grant Plan in June 2011 and amended such plan in March 2014 (as amended, the “2011 Plan”). The 2011 Plan allows for the grant of incentive stock options (“ISOs”), non-statutory non-employee In December 2014, in connection with the closing of the Company’s IPO, the 2011 Plan was terminated as to future grants and shares authorized for issuance under the 2011 Plan were canceled (except for those shares reserved for issuance upon exercise of outstanding stock options). As of December 31, 2017, options to purchase 3,936,786 shares of common stock were outstanding under the 2011 Plan pursuant to their original terms and no shares were available for future grant. 2014 Stock Option and Incentive Plan The Hortonworks, Inc. 2014 Stock Option and Incentive Plan (the “2014 Plan”) was adopted by the Company’s Board of Directors in September 2014. The 2014 Plan was approved by the Company’s stockholders in November 2014 and became effective immediately prior to the closing of the Company’s IPO. All shares that had been available for issuance but not covered by outstanding awards under the 2011 Plan rolled into the 2014 Plan following the consummation of the IPO. The 2014 Plan allows the plan administrator to make equity-based incentive awards to the Company’s full or part-time officers, employees, non-employee The exercise price of an option is determined by the plan administrator when the option is granted, and it may not be less than 100 percent of the fair market value of the shares on the date of grant, provided that the exercise price of ISOs granted to a 10 percent stockholder is not less than 110 percent of the fair market value of the shares on the date of grant. ISOs granted under the Amended 2014 Plan generally vest 25 percent after the completion of 12 months of service and the balance in equal monthly installments over the next 36 months of service, and expire 10 years from the date of grant (subject to earlier expiration upon occurrence of certain events). ISOs granted to a 10 percent stockholder expire five years from the date of grant (subject to earlier expiration upon occurrence of certain events). NSOs vest according to the specific option agreement, and expire 10 years from the date of grant. In general, RSUs granted to employees and non-employees The Company initially reserved 6,000,000 shares of the Company’s common stock for the issuance of awards under the 2014 Plan. This was in addition to the 923,732 shares of the Company’s common stock that remained available for issuance under the Company’s 2011 Plan as of the Company’s IPO date and that rolled into the 2014 Plan. The 2014 Plan also provides that the number of shares reserved and available for issuance under the plan will automatically increase each January 1, beginning on January 1, 2015, by five percent of the outstanding number of shares of the Company’s common stock on the immediately preceding December 31 or such lesser number of shares as determined by the plan administrator. This number is subject to adjustment in the event of a stock split, stock dividend or other change in the Company’s capitalization. The amendment and restatement of the 2014 Plan increased the number of shares reserved for issuance under the Amended 2014 Plan by 7,000,000 shares. In April, June and July 2015, under the 2014 Plan, the Company granted an aggregate of 421,484 PSUs to certain executive and senior officers (the “Grantees”) that vest upon (a) the achievement of specified performance targets as set by the Compensation Committee and (b) the Grantee remaining employed during the respective performance cycles over a service period of up to three years, with such service periods commencing on July 1, 2015. The performance target value for each performance cycle is based on an average of the applicable internal and external billings amounts for the respective performance cycle. The number of PSUs that vest for a given performance cycle is based on the Company’s achievement of actual billings relative to the performance target value. In October 2015, under the 2014 Plan, the Company granted an aggregate of 266,084 PSUs to the Grantees that vest upon (a) the achievement of specified performance targets as set by the Compensation Committee and (b) the Grantee remaining employed for the duration of the respective 12-month performance a pre-selected group In September 2017, under the Amended 2014 Plan, the Company granted 714,711 market-based PSUs to our Chief Executive Officer that vest upon (a) the achievement of a specific market-based performance goal related to the price of our common stock over forty consecutive trading days during a performance cycle of four years, with such performance cycle commencing on September 10, 2017 and (b) the Chief Executive Officer remaining employed through achievement of the performance goal. If the Company achieves the performance goal within the performance cycle, and the Chief Executive Officer remains employed through such achievement, 100 percent of the PSUs will vest upon achievement of the market-based performance goal. As of December 31, 2017, options to purchase shares of stock, RSUs and PSUs covering an aggregate of 10,973,357 shares of common stock were outstanding under the Amended 2014 Plan. On January 1, 2017, the shares reserved for issuance under the Amended 2014 Plan increased by 3,071,470, resulting in 22,606,183 total shares reserved for issuance under the Amended 2014 Plan as of December 31, 2017, of which 706,994 shares remained available for issuance. Stock Options A summary of information related to stock options for the year ended December 31, 2017 is presented below: Options Outstanding Number of Weighted- Weighted- Aggregate (in thousands) Outstanding—December 31, 2016 7,430,094 $ 9.81 6.73 $ 16,523 Granted — — Exercised (2,277,179 ) 5.30 Canceled/forfeited (662,470 ) 16.74 Outstanding—December 31, 2017 4,490,445 $ 11.08 6.14 $ 41,525 Exercisable—December 31, 2017 3,879,080 $ 10.38 6.05 $ 38,393 There were no options granted during the years ended December 31, 2017 and 2016. The weighted-average grant date fair value of all options to purchase common stock granted during the year ended December 31, 2015 was $23.17 per share. Aggregate intrinsic value represents the difference between the exercise price of the options to purchase common stock and the fair value of the Company’s common stock. The aggregate intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015 was $23.5 million, $13.2 million and $42.9 million, respectively. Cash received from option exercises during the year ended December 31, 2017 was $12.1 million. As of December 31, 2017, there was $4.6 million of unrecognized stock-based compensation expense related to unvested stock options which is expected to be recognized over a weighted-average period of 0.68 years. Restricted Stock A summary of information related to restricted stock for the year ended December 31, 2017 is presented below: Number of Weighted- (*) Unvested balance—December 31, 2016 275,835 $ 23.76 Granted — — Vested (137,916 ) 23.76 Canceled/forfeited — — Unvested balance—December 31, 2017 137,919 $ 23.76 (*) The weighted-average grant date fair value per share relates to 1,424,946 shares of restricted stock paid as part of the acquisition of Onyara, of which 137,919 shares are unvested as of December 31, 2017. See Note 4—“Business Combinations” for additional information regarding this transaction. The fair value of the restricted stock that vested during the years ended December 31, 2017 and 2016 was $2.3 million and $4.5 million, respectively. The fair value of the restricted stock that vested during the year ended December 31, 2015 was $14.4 million and $26.5 million, related to restricted stock vesting over a requisite service period and fully vested common shares issued as part of Onyara purchase consideration, respectively. As of December 31, 2017, there was $2.2 million of unrecognized stock-based compensation expense related to restricted stock which is expected to be recognized over a weighted-average period of 0.67 years. Restricted Stock Units A summary of information related to RSUs for the year ended December 31, 2017 is presented below: Number of Weighted-Average Unvested balance—December 31, 2016 10,836,508 $ 12.90 Granted 9,463,870 12.60 Vested (7,919,416 ) 12.73 Canceled/forfeited (2,801,121 ) 11.70 Unvested balance—December 31, 2017 9,579,841 $ 13.10 The fair value of the RSUs that vested during the year ended December 31, 2017 and 2016 was $113.1 million and $25.3 million, respectively. The fair value of the RSUs vested during the year ended December 31, 2015 was $1.1 million and $1.1 million, related to RSUs vesting over a requisite service period and vested RSUs issued as part of SequenceIQ purchase consideration, respectively. As of December 31, 2017, there was $106.1 million of unrecognized stock-based compensation expense related to RSUs which is expected to be recognized over a weighted-average period of 1.65 years. Performance-Based Restricted Stock Units A summary of information related to PSUs for the year ended December 31, 2017 is presented below: Number of Weighted-Average Unvested balance—December 31, 2016 424,503 $ 21.16 Granted 714,711 13.39 Vested (183,048 ) 15.87 Canceled/forfeited (116,309 ) 23.26 Unvested balance—December 31, 2017 839,857 $ 14.58 The fair value of the PSUs that vested during the year ended December 31, 2017 and 2016 was $1.9 million and $1.5 million, respectively. There were no PSUs that vested during the year ended December 31, 2015. As of December 31, 2017, there was $6.7 million of unrecognized stock-based compensation expense related to PSUs which is expected to be recognized over a weighted-average period of 0.65 years. Determining Fair Value for Employee Stock Option Grants The Company estimated the fair value of stock options granted using the Black-Scholes option pricing model with weighted-average assumptions as follows: Years Ended December 31, 2017 2016 2015 Expected term (in years) — — 6.0 Risk-free interest rate — % — % 1.59 % Expected volatility — % — % 44 % Dividend rate — % — % — % The fair value of each grant of stock options was determined using the Black-Scholes option pricing model and assumptions discussed below. Each of these inputs is subjective and generally requires significant judgment to determine. Fair Value of Common Stock Expected Term. Expected Volatility. Risk-Free Interest Rate. Dividend Rate. Determining Fair Value for Market-Based PSUs For PSUs that are market-based, the fair value of the Company’s common stock on the grant date is determined using the Monte Carlo valuation model. The Company estimated the fair value of market-based PSUs granted using the Monte Carlo valuation model with the following assumptions: Years Ended December 31, 2017 2016 2015 Risk-free interest rate 1.51 % — % — % Expected volatility 67 % — % — % Dividend rate — % — % — % Expected Term. Expected Volatility. Risk-free Interest Rate. Dividend Rate. Restricted Stock and Stock Options Subject to Repurchase The 2011 Plan allowed for the granting of options that may be exercised before the options have vested. Shares issued as a result of early exercise are shares that have not vested and are deemed to be restricted stock; they are subject to a vesting schedule identical to the vesting schedule of the related options, as well as certain other restrictions. Shares issued as a result of early exercise that have not vested are subject to repurchase by the Company upon termination of the purchaser’s employment or services, at the price paid by the purchaser, and are not deemed to be issued for accounting purposes until those related shares vest. The amounts received in exchange for these shares have been recorded as a liability on the accompanying consolidated balance sheets and will be reclassified into common stock and additional paid-in The number of shares of restricted stock and early exercised options to purchase common stock outstanding subject to the Company’s right of repurchase as of December 31, 2017 and 2016 was 10,500 and 30,708, respectively, which had repurchase prices ranging from $8.46 to $14.22 per share. The liability for shares subject to repurchase as of December 31, 2017 and 2016 was $0.1 million and $0.4 million, respectively. 2014 Employee Stock Purchase Plan The Company’s ESPP was adopted and approved by the Company’s Board of Directors in September 2014, was adopted and approved by the Company’s stockholders in November 2014, and was amended in August 2015 to allow employees of certain of the Company’s non-U.S. The following table summarizes the assumptions used in the Black-Scholes option pricing model to determine fair value of the Company’s common shares to be issued under the ESPP: Years Ended December 31, 2017 2016 2015 Expected term (in years) 0.5-1.0 0.5-1.0 0.5-1.0 Risk-free interest rate 0.51%-1.24% 0.25%-0.70% 0.10%-0.40% Expected volatility 18%-47% 26%-52% 35%-41% Dividend rate —% —% —% Each employee who is a participant in the ESPP may purchase shares by authorizing payroll deductions of up to 15 percent of his or her base compensation during an offering period. Unless the participating employee has previously withdrawn from the offering, his or her accumulated payroll deductions will be used to purchase shares on the last business day of the offering period at a price equal to 85 percent of the fair market value of the shares on the first business day or the last business day of the offering period, whichever is lower. Under applicable tax rules, an employee may purchase no more than $25,000 worth of shares of common stock, valued at the start of the purchase period, under the ESPP in any calendar year. As of December 31, 2017, there was $1.4 million of unrecognized stock-based compensation expense related to the ESPP, which is expected to be recognized over a weighted-average period of 0.32 years. Cash received from the purchases of shares under the ESPP during the year ended December 31, 2017 was $7.4 million. Determining Fair Value for Non-Employees Stock-based compensation expense related to stock options and RSUs granted to non-employees During the years ended December 31, 2017, 2016 and 2015, the Company granted non-employees non-employees non-employees non-employees non-employees Stock-based compensation expense related to non-employee The Company believes that the fair value of the stock options is more reliably measurable than the fair value of services received. The fair value of the stock options granted is calculated at each reporting date using the Black-Scholes option pricing model with the following weighted-average assumptions as of each of the following periods ended: December 31, 2017 2016 2015 Expected term (in years) 6.3 6.1 6.4 Risk-free interest rate 2.20 % 1.40 % 1.74 % Expected volatility 29 % 47 % 45 % Dividend rate — % — % — % Stock-Based Compensation Expense Total stock-based compensation expense, including stock-based compensation expense to non-employees, Years Ended December 31, 2017 2016 2015 Cost of revenue $ 7,676 $ 5,700 $ 2,702 Sales and marketing 35,210 25,787 11,688 Research and development 38,771 36,540 15,193 General and administrative 28,379 30,796 11,356 Total stock-based compensation expense $ 110,036 $ 98,823 $ 40,939 In February 2016, one of the executives of the Company voluntarily canceled a stock option to purchase 1,185,000 shares. As a result, the Company recognized in general and administrative expense a stock-based compensation expense of $10.0 million during the year ended December 31, 2016. Warrants In July 2011, the Company issued a warrant to purchase 6,500,000 shares of Series A preferred stock at an exercise price of $0.005 per share. The warrant was issued to Yahoo! Inc. (“Yahoo!”) in connection with the Company’s Series A financing and the transactions contemplated thereby, including commercial agreements with Yahoo! providing for support subscription offerings and certain rights to technology. In 2017, Verizon Communications, Inc. (“Verizon”) acquired the operating assets of Yahoo!. Yahoo! was subsequently renamed Altaba Inc. (“Altaba”), and the July 2011 warrant remained an asset of Altaba. As of December 31, 2017, the warrant was exercisable into 3,250,000 shares of common stock. In June 2014, the Company issued to Yahoo! a warrant to purchase a number of shares of common stock up to one percent of the sum of (i) 45,585,496, plus (ii) the number of shares of Series D preferred stock or shares of such stock issuable upon exercise of warrants to purchase such stock (on an as converted to common stock basis) issued or issuable upon exercise of warrants to purchase Series D preferred stock that were sold, if any, by the Company during the period commencing on June 9, 2014 and ending immediately prior to the occurrence of a corporate event at an exercise price of $8.46 per share. As described above, in 2017, Verizon acquired the operating assets of Yahoo!, and Yahoo! was subsequently renamed Altaba. The June 2014 warrant remained an asset of Altaba. As of December 31, 2017, the warrant was exercisable into 476,368 shares of common stock. Each warrant expires nine years from the date of issuance. The warrants vested upon consummation of the Company’s IPO in December 2014. As of December 31, 2017, neither warrant had been exercised into shares of common stock. Refer to Note 14—“Related Party Transactions” for additional information regarding related party transactions.

Net Loss Per Share of Common St

Net Loss Per Share of Common Stock	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Loss Per Share of Common Stock	10. NET LOSS PER SHARE OF COMMON STOCK Basic net loss per share of common stock is calculated by dividing net loss by the weighted-average number of shares of common stock outstanding during the period, less restricted common stock and common stock issued that is subject to repurchase, and excludes any dilutive effects of share-based awards. Diluted net loss per share of common stock is computed giving effect to all potential dilutive shares of common stock. As the Company had net losses for the years ended December 31, 2017, 2016 and 2015, all potential shares of common stock were determined to be anti-dilutive. The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share amounts): Years Ended December 31, 2017 2016 2015 Net loss $ (204,507 ) $ (251,688 ) $ (179,117 ) Weighted-average shares used in computing net loss per share of common stock 66,356,474 57,203,067 43,318,044 Net loss per share, basic and diluted $ (3.08 ) $ (4.40 ) $ (4.13 ) The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been anti-dilutive: As of December 31, 2017 2016 2015 Common stock warrants 3,250,000 3,250,000 3,250,000 Exercise and conversion of common stock warrants 476,368 476,368 476,368 Common stock subject to repurchase 10,500 30,708 55,603 Outstanding stock options 4,490,445 7,430,094 11,552,487 Unvested restricted stock 137,919 275,835 789,982 Unvested RSUs 9,579,841 10,836,508 5,169,301 Unvested PSUs 839,857 424,503 683,318 Estimated ESPP shares to be issued 292,978 442,992 151,468 Total 19,077,908 23,167,008 22,128,527

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	11. INCOME TAXES The components of income tax expense for the years ended December 31, 2017, 2016 and 2015 are as follows (in thousands): Years Ended December 31, 2017 2016 2015 Current: Federal $ — $ — $ — State and local 23 67 58 Foreign 2,793 1,130 514 Total current tax expense 2,816 1,197 572 Total deferred tax (benefit) expense (330 ) 27 (140 ) Income tax expense $ 2,486 $ 1,224 $ 432 The components of loss before income taxes by United States and foreign jurisdictions are as follows (in thousands): Years Ended December 31, 2017 2016 2015 United States $157,688 $209,882 $137,713 Foreign 44,333 40,582 40,972 Loss before income tax $ 202,021 $ 250,464 $ 178,685 Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets are as follows (in thousands): December 31, 2017 2016 Deferred tax assets: Net operating loss carryforwards $ 136,596 $ 132,744 Research and development credits 14,445 8,997 Warrant expense 12,528 19,312 Depreciation and amortization 1,191 1,105 Accruals and reserves 1,206 3,005 Deferred revenue 14,000 9,093 Stock-based compensation expense 8,412 15,865 Other 1,145 2,037 Gross deferred tax assets 189,523 192,158 Valuation allowance (189,298 ) (192,152 ) Intangibles (201 ) (312 ) Net deferred tax assets (liabilities) $ 24 $ (306 ) The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate: Years Ended December 31, 2017 2016 2015 Tax at federal statutory rate 34.00 % 34.00 % 34.00 % State and local taxes, net of federal benefit 2.28 2.54 2.93 Permanent differences and other items not individually material (0.16 ) (0.08 ) (0.26 ) Stock-based compensation expense 1.39 (8.24 ) (2.29 ) Credits 2.24 2.01 0.62 Foreign tax differential (8.68 ) (5.97 ) (8.01 ) Change in valuation allowance 1.41 (24.75 ) (27.23 ) Change in federal tax rate (40.86 ) — — Adoption of ASU 2016-09 7.15 — — Income tax expense (1.23 )% (0.49 )% (0.24 )% The Company’s effective tax rate for the period ended December 31, 2017 was lower than the statutory tax rate primarily because of the valuation allowance on its U.S. and foreign deferred tax assets and the losses of foreign subsidiaries taxed at lower rates, partially offset by state taxes and tax credits. The losses of the foreign subsidiaries were generated primarily by the Company’s cost sharing agreement with its Netherlands operations. The income tax expense for the years ended December 31, 2017, 2016 and 2015 primarily relate to state minimum income tax, non-recoverable On December 22, 2017, the Tax Cuts and Jobs Act (the “Act”) was signed into law. The new legislation decreases the U.S. corporate federal income tax rate from 35 percent to 21 percent effective January 1, 2018. The Company revalued its deferred tax assets and liabilities accordingly. There was no net impact on recorded deferred tax balances, as the remeasurement of net deferred tax assets was offset by a change in valuation allowance. The Act imposes a one-time The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 (“SAB 118”) on December 23, 2017 regarding application of the Act. It provides a “measurement period,” lasting through December 22, 2018, to allow registrants time to obtain, prepare and analyze information to complete the accounting required under ASC 740, Income Taxes A valuation allowance is provided when it is more likely than not that the deferred tax assets will not be realized. The Company has established a valuation allowance to offset net deferred tax assets at December 31, 2017 due to the uncertainty of realizing future tax benefits from its NOL carryforwards and other deferred tax assets. The net valuation allowance decreased by approximately $2.9 million during the year ended December 31, 2017. As of December 31, 2017, the Company had NOL carryforwards for federal and state and local tax purposes of approximately $525.3 million and $405.7 million, respectively. The NOL carryforwards will expire at various dates beginning in 2031 (federal) and 2018 (state and local), unless previously utilized. The Company also has federal and state research and development tax credit carryforwards of approximately $11.8 million and $9.5 million, respectively. The federal tax credits will expire at various dates beginning in 2031, unless previously utilized. The state tax credits do not expire and will carry forward indefinitely until utilized. Current laws impose substantial restrictions on the utilization of NOLs and credit carryforwards in the event of an “ownership change” within a three-year period as defined by the Internal Revenue Code Section 382. If there should be an ownership change, the Company’s ability to utilize its carryforwards could be limited. The Company previously considered the earnings in its non-U.S. non-U.S. The Company is currently analyzing its global working capital and cash requirements and the potential tax liabilities attributable to a repatriation, but it has not yet determined whether its analysis will result in repatriation of any earnings from its non-U.S. The Company adopted ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting The Company recorded unrecognized tax benefits for uncertain tax positions of approximately $5.3 million and $3.5 million as of December 31, 2017 and 2016, respectively, of which none would impact the effective tax rate, if recognized, since the benefit would be offset by an increase in the valuation allowance. The Company’s policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. During the year ended December 31, 2017, the Company recognized no interest and penalties associated with unrecognized tax benefits. There are no tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly increase or decrease within 12 months of the reporting date. The Company files income tax returns in the U.S. federal jurisdiction, various state jurisdictions and foreign jurisdictions. The Company’s tax years for fiscal year end 2011 and forward are subject to examination by the U.S. tax authorities and various state tax authorities, and the Company’s tax years for fiscal year end 2013 and forward are subject to examination by various foreign tax authorities. During 2017, the IRS concluded its examination of the Company’s U.S. federal income tax returns for the tax year ended April 30, 2014 and the eight months ended December 31, 2014 with no changes made to the returns. A reconciliation of the Company’s unrecognized tax benefits is as follows (in thousands): Balance as of December 31, 2015 $ 1,585 Increases related to prior years’ tax positions 875 Increases related to current year’s tax positions 1,076 Balance as of December 31, 2016 3,536 Increases related to prior years’ tax positions 333 Increases related to current year’s tax positions 1,444 Balance as of December 31, 2017 $ 5,313

Segment and Geographical Inform

Segment and Geographical Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment and Geographical Information	12. SEGMENT AND GEOGRAPHICAL INFORMATION The Company’s chief operating decision maker reviews financial information on a consolidated basis for the purposes of allocating resources and evaluating financial performance. The Company’s chief operating decision maker has direct reports responsible for various functions within the Company ( e.g. The following table summarizes the Company’s revenue by customer domicile (in thousands): Years Ended December 31, 2017 2016 2015 United States $187,926 $137,933 $105,842 United Kingdom 21,929 21,025 3,815 Rest of world 51,955 25,503 12,287 Total revenue $ 261,810 $ 184,461 $ 121,944 No individual country other than the United States and the United Kingdom accounted for more than 10 percent of total revenue during any of the periods presented. The following table summarizes the Company’s tangible long-lived assets by country (in thousands): December 31, 2017 2016 United States $ 10,671 $ 15,838 Ireland 2,120 2,033 India 2,578 471 Rest of world 1,014 1,039 Total property and equipment, net $ 16,383 $ 19,381 No individual country other than the United States, Ireland and India accounted for more than 10 percent of total tangible long-lived assets as of December 31, 2017 and 2016, respectively.

401(K) Plan

401(K) Plan	12 Months Ended
	Dec. 31, 2017
Postemployment Benefits [Abstract]
401(K) Plan	13. 401(K) PLAN The Company has a qualified defined contribution plan under Section 401(k) of the Internal Revenue Code covering eligible employees. To date, the Company has not made any matching contributions to this plan.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	14. RELATED PARTY TRANSACTIONS In June 2011, the Company entered into a two-year In February 2012, the Company entered into a development, distribution and marketing agreement with Teradata Corporation (“Teradata”), which at that time was a significant shareholder. Under this and subsequent arrangements, the Company is providing support subscription and professional services to Teradata and certain of its end users. In April 2012, the Company received a nonrefundable prepayment of $9.5 million from Teradata as consideration for support subscription offerings and professional services performed by the Company through 2016. In June 2015, the Company entered into an amendment to their prior agreement with Teradata and received a second prepayment of $1.5 million in August 2015 as consideration for support subscription offerings and professional services performed by the Company through 2017. In September 2016, the Company entered into an amendment with Teradata and received a third prepayment of $1.5 million in the same month as consideration for support subscription offerings and professional services performed by the Company through 2017. As of February 2, 2016, Teradata was no longer a Hortonworks shareholder and as such, was not considered to be a related party as of December 31, 2017 and 2016. In September 2013, the Company entered into a common stock purchase agreement with an affiliate of AT&T Inc. (“AT&T”) covering the sale and issuance of 390,269 shares of the Company’s stock for a nominal amount of consideration. The initial grant included restricted shares that were subject to repurchase rights by the Company. Fifty percent of the shares vested on an equal and ratable basis over an 18-month In June 2014, the Company issued a warrant to purchase a number of shares of common stock in exchange for the amendment of certain rights held by Yahoo! under the Investors’ Rights Agreement to approve certain corporate transactions involving the Company. The warrant became exercisable upon the consummation of the IPO. As described above, in 2017, Verizon acquired the operating assets of Yahoo!, and Yahoo! was subsequently renamed Altaba. The June 2014 warrant remained as an asset of Altaba. As of December 31, 2017, the warrant is exercisable for 476,368 shares of the Company’s common stock. In July 2014, the Company entered into a Series D preferred stock purchase agreement with Hewlett Packard Enterprise Company (“Hewlett Packard Enterprise”) covering the sale and issuance of 2,051,349 shares of the Company’s common stock for a total of $50.0 million. Under this and subsequent arrangements, Hewlett Packard Enterprise resells the Company’s support subscription services. The Company receives a net percentage of the gross dollars collected from Hewlett Packard Enterprise’s end-user The following table summarizes the Company’s common stock shares/warrants owned by entities that were related parties as of December 31, 2017, 2016 and 2015. See Note 9—“Stockholders’ (Deficit) Equity” for information regarding the terms of the Altaba (formerly, Yahoo!) warrants issued in July 2011 and June 2014. December 31, 2017 Altaba Shares/warrants owned by related party: Common stock 3,845,806 Common stock warrants 3,726,368 December 31, Altaba Shares/warrants owned by related party: Common stock 3,845,806 Common stock warrants 3,726,368 December 31, 2015 Altaba Teradata AT&T Hewlett Shares/warrants owned by related party: Common stock 3,845,806 — 15,269 2,051,349 Common stock warrants 3,726,368 — — — For the years ended December 31, 2017, 2016 and 2015, the Company recognized revenue from sales to related parties of $0.8 million, $2.6 million and $10.1 million, respectively. As of December 31, 2017 and 2016, the Company’s deferred revenue from related parties was $0.8 million and $1.6 million, respectively, and accounts receivable from related parties was $0.8 million and $1.6 million, respectively. The Company’s payables due to related parties were immaterial as of December 31, 2017 and 2016. The Company does not separately record routine cost of revenue and operating expenses on a per related party contract basis.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	15. SUBSEQUENT EVENT On January 31, 2018, Altaba (formerly, Yahoo!) net exercised the warrants issued in July 2011 and June 2014 for a total of 3,522,730 shares of the Company’s common stock. As a result of such exercises, neither the July 2011 nor the June 2014 warrants is outstanding.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The consolidated financial statements have been prepared in accordance with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, and expenses, the related disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of expenses during the reporting period. The Company bases its estimates and judgments on its historical experience, knowledge of current conditions and its beliefs regarding what may occur in the future given available information. Estimates, assumptions and judgments are used for, but are not limited to, revenue recognition, stock-based awards, accounting for income taxes, allowance for doubtful accounts, valuation and determination of other-than-temporary impairments of notes receivable and certain accrued liabilities. Actual results may differ from these estimates.
Concentration of Risk	Concentration of Risk Credit Risk Financial instruments, which potentially subject the Company to concentration of credit risk, consist primarily of cash and cash equivalents and investments. The Company places its cash and cash equivalents with major financial institutions, which management assesses to be of high-credit quality. The Company’s investment policies limit investments to those that are investment grade, liquid securities and restricts placement of these investments to issuers evaluated as creditworthy. Concentration of Revenue and Accounts Receivable The Company generally does not require collateral or other security in support of accounts receivable. Allowances are provided for individual accounts receivable when the Company becomes aware of a customer’s inability to meet its financial obligations, such as in the case of bankruptcy, deterioration in the customer’s operating results or change in financial position. If circumstances related to customers change, estimates of the recoverability of receivables would be further adjusted. The Company also considers broad factors in evaluating the sufficiency of its allowances for doubtful accounts, including the length of time receivables are past due, significant one-time Significant customers are those which represent 10 percent or more of the Company’s total revenue or gross accounts receivable balance for each respective consolidated statement of operations and consolidated balance sheet period. For the years ended December 31, 2017, 2016 and 2015, there were no customers that represented 10 percent or more of the Company’s total revenue. As of both December 31, 2017 and 2016, there were no customers that represented 10 percent or more of the Company’s gross accounts receivable balance.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash, money market funds, U.S. Treasury bills, commercial paper, and corporate notes and bonds with original maturities of three months or less at the time of purchase. Operating cash deposits held with banks may exceed the amount of insurance provided on such deposits. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions with reputable credit and therefore bear minimal credit risk. The Company seeks to mitigate its credit risk by spreading such risk across multiple counterparties and monitoring the risk profiles of these counterparties.
Investments	Investments The Company classifies its debt securities as “trading,” “available-for-sale” “held-to-maturity,” available-for-sale Available-for-sale Available-for-sale
Fair Value Measurement	Fair Value Measurement Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal market (or most advantageous market, in the absence of a principal market) for the asset or liability in an orderly transaction between market participants at the measurement date. Further, entities are required to maximize the use of observable inputs and minimize the use of unobservable inputs in measuring fair value, and to utilize a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The three levels of inputs used to measure fair value are as follows: Level 1 Level 2 Level 3
Restricted Cash	Restricted Cash Restricted cash includes collateral used to secure a credit card, and may not be used or transferred until the restriction is released by the issuing bank. Restricted cash also includes amounts to secure letters of credit issued in lieu of deposits on office space.
Software Development Costs	Software Development Costs The Company develops open source software that is generally freely available on the Apache Hadoop platform. Capitalization of software development costs begins upon the establishment of technological feasibility and ceases when the product is available for general release. There is usually a very minimal passage of time between the achievement of technological feasibility and the availability of the Company’s software for general release. Accordingly, there are no capitalized software development costs for the years ended December 31, 2017 and 2016.
Internal Use Software	Internal Use Software The Company’s capitalized internal use software costs were not material for the years ended December 31, 2017 and 2016.
Property and Equipment	Property and Equipment Property and equipment are stated at cost. Depreciation is computed using a straight-line method over the estimated useful lives, determined to be two years for purchased software, two to three years for computer equipment, and five years for network and communication equipment and furniture and fixtures. Expenditures for repairs and maintenance are charged to expenses as incurred. Leasehold improvements are amortized on a straight-line basis over the term of the lease, or the useful life of the assets, whichever is shorter.
Goodwill and Long-Lived Assets	Goodwill and Long-Lived Assets Goodwill is tested for impairment on an annual basis and between annual tests if events or circumstances indicate that an impairment loss may have occurred. The test is based on a comparison of the reporting unit’s book value to its estimated fair market value. The annual impairment test is performed by the Company during the fourth quarter of each fiscal year using the opening consolidated balance sheet as of the first day of the fourth quarter, with any resulting impairment recorded in the fourth quarter of the fiscal year. During the year ended December 31, 2017, the Company determined that the fair value of its sole reporting unit exceeded its carrying value, and as a result, no goodwill impairment was recorded in fiscal 2017. Since the Company’s inception, goodwill has not been impaired. Long-lived assets (including property and equipment) are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. In such instances, the recoverability of assets to be held and used is measured first by a comparison of the carrying amounts of the assets or asset groups to future undiscounted net cash flows expected to be generated by the assets or asset groups. If such assets or asset groups are considered to be impaired, an impairment loss would be recognized if the carrying amount of the assets or asset groups exceeds the fair value of the assets or asset groups. During the year ended December 31, 2016, the Company recognized an impairment charge of $2.7 million in operating expenses due to a promissory note and related interest receivable. During the year ended December 31, 2016, the Company determined that it is probable that the promissory note and related interest receivable are unrecoverable due to our estimate of the third-party service provider’s illiquidity and unfavorable rate of cash use.
Revenue Recognition	Revenue Recognition Apache Hadoop, Apache NiFi and associated open source technology projects within the Apache Software Foundation are made freely available within the open source community. While these technologies have emerged to enable the modern data center architecture, they are complex to deploy and consume as individual components inhibiting broad adoption by enterprises. The Company’s efforts are thus focused on creating a software distribution of these projects by assembling key component software projects into an open platform that address the needs of enterprises. By working in concert with the Apache community to develop Connected Data Platforms, Hortonworks Data Platform (“HDP”), Hortonworks DataFlow (“HDF”) and other offerings, the Company’s software distribution provides customers with a scalable, secure and governed environment for their data requirements. Connected Data Platforms are made available under an Apache open source license. Open source software is an alternative to proprietary developed software and represents a different model for the development and licensing of commercial software code than that typically used for proprietary software. Because open source software code is generally freely shared, the Company does not typically generate any direct revenue from its software development activities. The Company generates the predominant amount of its revenue through support (support subscription) and consulting and education services (professional services) arrangements with its enterprise customers. The Company’s professional services provide assistance in the implementation process and education related activities. The Company prices support subscription offerings based on the number of servers in a cluster, or nodes, core or edge devices, data under management and/or the scope of support provided. The Company’s consulting services are priced primarily on a time and materials basis, and to a lesser extent, a fixed fee basis, and education services are priced based on attendance. Under the Company’s support subscription and professional services arrangements, revenue is recognized when (i) persuasive evidence of an arrangement exists; (ii) the services have been delivered; (iii) the arrangement fee is fixed or determinable; and (iv) collectability is probable.
Support Subscription Revenue	Support Subscription Revenue In single-element arrangements, support subscription fees are recognized on a ratable basis over the support subscription term. The Company’s support subscription arrangements do not typically contain refund provisions for fees earned related to support services performed.
Professional Services Revenue	Professional Services Revenue Professional services revenue is derived from customer fees for consulting services engagements and education services. The Company’s consulting services are provided primarily on a time and materials basis and, to a lesser extent, a fixed fee basis, and education services are priced based on attendance. Revenue from professional services, when such services are sold in single-element arrangements, is recognized as the services are performed.
Multiple-Element Arrangements	Multiple-Element Arrangements The Company’s multiple-element arrangements generally include support subscription combined with professional services. The Company has not established vendor-specific objective evidence of fair value (“VSOE”) for its support subscriptions and professional services offerings, and the Company recognizes revenue on a ratable basis over the period beginning when both the support subscription and professional services have substantially commenced, and ending at the conclusion of the support subscription or professional services period, whichever is longer. Under the Company’s multiple-element arrangements, the support subscription element generally has the longest service period and the professional services element is performed during the earlier part of the support subscription period. On occasion, the Company may sell engineering services and/or a premium subscription agreement that provides a customer with development input and the opportunity to work more closely with its developers. The Company’s agreements with customers often include multiple support subscription and/or professional services elements, and these elements are sometimes included in separate contracts. The Company considers an entire customer arrangement to determine if separate contracts should be considered linked arrangements for the purposes of revenue recognition. Revenue recognition requires judgment, including whether a software arrangement includes multiple elements, and if so, whether VSOE exists for those elements. A portion of revenue may be recorded as unearned due to undelivered elements. Changes to the elements in a software arrangement, the ability to identify the VSOE for those elements and the VSOE of all respective elements could materially impact the amount of earned and unearned revenue in a given period.
Revenue from Strategic Relationships and Reseller Arrangements	Revenue from Strategic Relationships and Reseller Arrangements The Company has strategic relationships and reseller arrangements with third parties (collectively, “Partners”). Under these arrangements, the Company is not the primary obligor for what is ultimately sold by the Partners to their end customers. The amount recognized as revenue from sales to end users represents the amount due to the Company from the Partners and is generally recognized on a ratable basis over the applicable services term under support subscription revenue.
Deferred Revenue	Deferred Revenue Deferred revenue consists of amounts billed to customers but not yet recognized in revenue. As of December 31, 2017 and 2016, substantially all of the Company’s accounts receivable represents amounts billed to customers but not yet received or recognized as revenue and are thus recorded as deferred revenue.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on the assessment of the collectability of accounts. The Company regularly reviews the adequacy of the allowance for doubtful accounts by considering the age of each outstanding invoice and the collection history of each customer to determine whether a specific allowance is appropriate. When deemed uncollectable, accounts receivable are reserved via the allowance for doubtful accounts and charged against bad debt expense or the related deferred revenue, as applicable.
Cost of Revenue	Cost of Revenue Cost of support subscription revenue consists primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for employees, including support engineers, associated with the Company’s support subscription offerings mainly related to technology support and allocated shared costs. Cost of professional services revenue consists primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for employees and fees to subcontractors associated with the Company’s professional service contracts, travel costs and allocated shared costs. The Company allocates shared costs such as rent, information technology and employee benefits to all departments based on headcount. As such, allocated shared costs are reflected in cost of revenue and each operating expense category. Cost of revenue for support subscription and professional services is expensed as incurred.
Sales and Marketing Expenses	Sales and Marketing Expenses Sales and marketing expenses consist primarily of personnel costs (including cash compensation, commissions, benefits and stock-based compensation expense) for the Company’s sales and marketing employees. In addition, sales and marketing expense include the cost of advertising, online marketing, promotional events, corporate communications, product marketing, other brand-building activities, plus allocated shared costs. All costs of advertising, including cooperative marketing arrangements, are expensed as incurred. Advertising expense totaled $8.9 million, $9.1 million and $11.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.
Research and Development Expenses	Research and Development Expenses Research and development expenses consist primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for the Company’s research and development employees, costs associated with subcontractors and equipment lease expenses, plus allocated shared costs. The Company’s research and development expenses include costs for development related to the distribution of its solutions, including security updates, fixes, functionality enhancements, upgrades to the technology and new versions of the software, quality assurance personnel, technical documentation personnel and at times, expenses related to engineering resources for its subscription and professional services offerings.
General and Administrative Expenses	General and Administrative Expenses General and administrative expenses consist primarily of personnel costs (including cash compensation, benefits and stock-based compensation expense) for our executive, finance, human resources, information technology, legal and other administrative employees. In addition, general and administrative expenses include fees for third-party professional services, including consulting, accounting and legal services and other corporate expenses and allocated overhead.
Stock-Based Compensation Expense	Stock-Based Compensation Expense The Company recognizes compensation costs related to employee stock options, time-based restricted stock units (“RSUs”), performance-based restricted stock units (“PSUs”), restricted stock awards and participation in the Company’s 2014 Employee Stock Purchase Plan, as amended (“ESPP”), based on the estimated fair value of each award on the grant date and forfeitures as they occur beginning on January 1, 2017. The Company estimates the grant date fair value of options using the Black-Scholes option pricing model. The Company estimates the grant date fair value of RSUs and PSUs that are not market-based using the closing market price of the Company’s common stock on the grant date. The Company estimates the grant date fair value of market-based PSUs with pre-established The Company recognizes compensation costs related to restricted stock granted in connection with an acquisition based upon the fair market value of the underlying shares of common stock on the grant date, which is generally considered to be the closing date of the acquisition. The Company recognizes compensation costs related to stock options and RSUs issued to non-employees based to non-employees are PSUs allow the recipients of such awards to earn fully vested shares of the Company’s common stock upon the achievement of pre-established performance
Income Taxes	Income Taxes The Company accounts for income taxes using an asset and liability approach. Deferred income tax assets and liabilities are computed for differences between the financial statement and income tax basis of assets and liabilities that will result in taxable or deductible amounts in the future. Such deferred income tax asset and liability computations are based on enacted tax laws and rates applicable to periods in which the differences are expected to affect taxable income. A valuation allowance is established, when necessary, for any portion of deferred income tax assets where it is considered more likely than not that it will not be realized. The tax effects of the Company’s income tax positions are recognized only if determined “more likely than not” to be sustained based solely on the technical merits as of the reporting date. The Company considers many factors when evaluating and estimating its tax positions and tax benefits, which may require periodic adjustments and which may not accurately anticipate actual outcomes. The Company accounts for excess tax benefits and tax deficiencies as income tax expense or benefit, treated as discrete items in the reporting period in which they occur, and recognizes previously unrecognized deferred tax assets that arose directly from (or the use of which was postponed by) tax deductions related to equity compensation in excess of compensation recognized for financial reporting.
Foreign Currency	Foreign Currency The remeasurement of foreign currencies creates remeasurement adjustments that are included in the consolidated statements of operations. For the year ended December 31, 2017, the net loss from remeasurement adjustments was $3.1 million. For the years ended December 31, 2016 and 2015, the net gains from remeasurement adjustments were immaterial. For subsidiaries with non-U.S.
Net Loss Per Share of Common Stock	Net Loss Per Share of Common Stock Basic net loss per share of common stock is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period, less restricted common stock and common stock issued that is subject to repurchase, and excludes any dilutive effects of share-based awards. Diluted net loss per share of common stock is the same as basic net loss per share of common stock, because the effects of potentially dilutive securities are anti-dilutive.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting, ASU 2017-09 will In January 2017, FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ASU 2017-04 will In January 2017, FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, ASU 2017-01 will In November 2016, FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash 2016-18 In August 2016, FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments 2016-15 In February 2016, FASB issued ASU No. 2016-02, Leases (Topic 842), right-of-use 2016-02 In May 2014, FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) In August 2015, FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of Effective Date • ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606) Narrow-Scope Improvements and Practical Expedients ASU 2016-12 amends measuring non-cash consideration, • ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ASU 2016-10 addresses • ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ASU 2016-08 requires The new standard permits adoption either by using (i) a full retrospective approach for all periods presented or (ii) a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures. The Company adopted the new standard as of January 1, 2018 using the modified retrospective approach. The Company’s decision was based on a number of factors such as the significance of the impact of the new standard on the Company’s financial results, system readiness, including that of software procured from third-party providers, and the Company’s ability to accumulate and analyze the information necessary to assess the cumulative effect of the new standard through January 1, 2018. The Company has substantially completed its evaluation of the impact of the new standard on its accounting policies, processes and system requirements. The Company has assigned internal resources in addition to the engagement of third-party service providers to assist in the evaluation and to provide periodic updates to management and the Audit Committee. In evaluating the risks associated with the adoption of the new accounting standard, the Company has identified and scoped the different revenue streams and reviewed contracts in each revenue stream for terms and conditions that could result in different accounting treatment. Furthermore, the Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new standard. While the Company continues to assess all potential impacts under the new standard, significant impacts are expected to the timing and amount of support subscription and professional services revenue recognized, as well as the capitalization and amortization of contract acquisition costs. In addition, the Company will update certain disclosures, as applicable, included in its filings pursuant to the Securities Exchange Act of 1934, as amended, to meet the requirements of the new standard. Under current industry-specific software revenue recognition guidance, the Company has concluded it has not established VSOE for support subscriptions and professional services offerings in multiple-element arrangements where support subscriptions are sold with professional services. The Company recognizes revenue on a ratable basis over the period beginning when both the support subscription and professional services have substantially commenced, and ending at the conclusion of the support subscription or professional services period, whichever is longer. The new standard, which does not retain the concept of VSOE, requires an evaluation of whether support subscriptions and professional services are distinct performance obligations, and therefore should be separately recognized as the respective performance obligations are satisfied based on the standalone selling price for each performance obligation, which may not be on a ratable basis. Based on the Company’s evaluation under the new standard, the timing of revenue recognition will change significantly for professional services bundled in multiple-element arrangements and currently recognized ratably due to lack of VSOE for support subscriptions. In particular, professional services revenue will be recognized in an earlier period and over a shorter timeframe under the new standard as the services are delivered compared to the Company’s current accounting policy under the existing standards and guidance. Also, the timing of recognition will change to begin in an earlier period for some support subscriptions bundled in multiple-element arrangements compared to the Company’s current accounting policy for multiple-element arrangements whereby recognition generally begins when both the support subscription and professional services have substantially commenced. As part of its evaluation, the Company has also considered the impact of the guidance in Accounting Standards Codification (“ASC”) 340-40 , Other Assets and Deferred Costs; Contracts with Customers e.g. The Company adopted the new standard effective January 1, 2018, by recognizing the cumulative effect of initially applying the new standard. As a result of adopting ASU 2014-09 (Topic 606) 340-40,

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Summary of Available-for-sale Securities	The following table summarizes the investments in available-for-sale December 31, 2017 Gross Gross Gross Estimated U.S. Treasury bills $ 8,612 $ 4 $ — $ 8,616 Certificates of deposit 750 — — 750 Commercial paper 3,498 — (1 ) 3,497 Corporate notes and bonds 5,806 — (1 ) 5,805 Total investments in available-for-sale securities $ 18,666 $ 4 $ (2 ) $ 18,668 December 31, 2016 Gross Gross Gross Estimated U.S. government securities $ 2,072 $ — $ — $ 2,072 Certificates of deposit 960 — — 960 Commercial paper 2,497 — — 2,497 Corporate notes and bonds 30,347 4 (32 ) 30,319 Total investments in available-for-sale securities $ 35,876 $ 4 $ (32 ) $ 35,848
Contractual Maturities of Investments in Available-for-sale Securities	The contractual maturities of investments in available-for-sale December 31, 2017 2016 Gross Fair Value Gross Fair Value Due within one year $ 18,666 $ 18,668 $ 31,792 $ 31,764 Due after one year through five years — — 4,084 4,084 Total investments in available-for-sale $ 18,666 $ 18,668 $ 35,876 $ 35,848
Financial Assets Measured on Recurring Basis by Level within Fair Value Hierarchy	The following table sets forth the fair value of the Company’s financial assets measured on a recurring basis by level within the fair value hierarchy (in thousands): December 31, 2017 Level 1 Level 2 Total Cash equivalents: Money market funds $ 25,947 $ — $ 25,947 U.S. Treasury bills 3,599 — 3,599 Commercial paper — 3,497 3,497 Corporate notes and bonds — 1,799 1,799 Short-term investments: U.S. Treasury bills 5,017 — 5,017 Certificates of deposit — 750 750 Corporate notes and bonds — 4,006 4,006 Total financial assets $ 34,563 $ 10,052 $ 44,615 December 31, 2016 Level 1 Level 2 Total Cash equivalents: Money market funds $ 24,533 $ — $ 24,533 Short-term investments: U.S. government securities — 2,072 2,072 Certificates of deposit — 960 960 Commercial paper — 2,497 2,497 Corporate notes and bonds — 26,235 26,235 Long-term investments: Corporate notes and bonds — 4,084 4,084 Total financial assets $ 24,533 $ 35,848 $ 60,381

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2017
Onyara, Inc. [Member]
Summary of Acquisition Date Fair Value of Purchase Consideration	The acquisition date fair value of the purchase consideration was $26.5 million, which included the following (in thousands): Common stock (921,643 shares at fair value of $23.76 per share) $ 21,898 Holdback of 194,259 shares of common stock for a period of 12 months for general representations and warranties 4,616 Total $ 26,514
Summary of Fair Values of Assets Acquired and Liabilities Assumed	The following table summarizes the allocation of the consideration paid of approximately $26.5 million to the fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands): Goodwill $ 26,429 Cash 180 Tangible liabilities acquired (95 ) Total $ 26,514
SequenceIQ [Member]
Summary of Acquisition Date Fair Value of Purchase Consideration	The acquisition date fair value of the purchase consideration was $10.0 million, which included the following (in thousands): Cash $ 3,721 Cash holdback for a period of 15 months for general representations and warranties 1,875 Cash payable upon 18-month 1,651 Contingent consideration 1,625 Vested RSUs (49,102 shares at fair value of $21.97 per share) 1,079 Total $ 9,951
Summary of Fair Values of Assets Acquired and Liabilities Assumed	The following table summarizes the allocation of the consideration paid of approximately $10.0 million to the fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands): Tangible assets acquired, net $ 191 Developed technology 4,395 Goodwill 5,785 Deferred tax liabilities, net (420 ) Total $ 9,951

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	Property and equipment, net, consisted of the following (in thousands): December 31, 2017 2016 Computer equipment $ 13,353 $ 12,513 Network and communication equipment 4,889 3,453 Purchased software 898 667 Furniture and fixtures 5,356 4,585 Capital leases 743 476 Leasehold improvements 12,003 10,871 Assets not yet in use 198 206 Property and equipment, gross 37,440 32,771 Less: Accumulated depreciation (21,057 ) (13,390 ) Total property and equipment, net $ 16,383 $ 19,381

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets, Net	The following table summarizes the Company’s intangible assets, net (in thousands): December 31, 2017 Gross Carrying Accumulated Net Developed technology $ 4,395 $ (2,153 ) $ 2,242 Intangible assets, net $ 4,395 $ (2,153 ) $ 2,242 December 31, 2016 Gross Carrying Accumulated Net Developed technology $ 4,395 $ (1,274 ) $ 3,121 Intangible assets, net $ 4,395 $ (1,274 ) $ 3,121

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Commitments	As of December 31, 2017, future minimum lease commitments under non-cancelable Years Ending December 31, Leases 2018 $ 5,942 2019 2,741 2020 1,702 2021 1,097 2022 429 Thereafter 3,735 Gross lease payments 15,646 Less: Non-cancelable (604 ) Net lease payments $ 15,042

Stockholders' (Deficit) Equity

Stockholders' (Deficit) Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Common Stock Reserved for Issuance	The Company reserved shares of common stock, on an as-if December 31, 2017 2016 Common stock warrants 3,250,000 3,250,000 Exercise and conversion of common stock warrants 476,368 476,368 Common stock subject to repurchase 10,500 30,708 Outstanding stock options 4,490,445 7,430,094 Unvested restricted stock 137,919 275,835 Unvested RSUs 9,579,841 10,836,508 Unvested PSUs 839,857 424,503 Shares available for issuance under Amended 2014 Stock Option and Incentive Plan 706,994 4,234,205 Shares available for purchase under Amended 2014 Employee Stock Purchase Plan 1,933,343 2,451,215 Total 21,425,267 29,409,436
Summary of Information Related to Stock Options	A summary of information related to stock options for the year ended December 31, 2017 is presented below: Options Outstanding Number of Weighted- Weighted- Aggregate (in thousands) Outstanding—December 31, 2016 7,430,094 $ 9.81 6.73 $ 16,523 Granted — — Exercised (2,277,179 ) 5.30 Canceled/forfeited (662,470 ) 16.74 Outstanding—December 31, 2017 4,490,445 $ 11.08 6.14 $ 41,525 Exercisable—December 31, 2017 3,879,080 $ 10.38 6.05 $ 38,393
Summary of Information Related to Restricted Stock	A summary of information related to restricted stock for the year ended December 31, 2017 is presented below: Number of Weighted- (*) Unvested balance—December 31, 2016 275,835 $ 23.76 Granted — — Vested (137,916 ) 23.76 Canceled/forfeited — — Unvested balance—December 31, 2017 137,919 $ 23.76 (*) The weighted-average grant date fair value per share relates to 1,424,946 shares of restricted stock paid as part of the acquisition of Onyara, of which 137,919 shares are unvested as of December 31, 2017. See Note 4—“Business Combinations” for additional information regarding this transaction.
Summary of Information Related to RSUs	A summary of information related to RSUs for the year ended December 31, 2017 is presented below: Number of Weighted-Average Unvested balance—December 31, 2016 10,836,508 $ 12.90 Granted 9,463,870 12.60 Vested (7,919,416 ) 12.73 Canceled/forfeited (2,801,121 ) 11.70 Unvested balance—December 31, 2017 9,579,841 $ 13.10
Summary of Information Related to PSUs	A summary of information related to PSUs for the year ended December 31, 2017 is presented below: Number of Weighted-Average Unvested balance—December 31, 2016 424,503 $ 21.16 Granted 714,711 13.39 Vested (183,048 ) 15.87 Canceled/forfeited (116,309 ) 23.26 Unvested balance—December 31, 2017 839,857 $ 14.58
Summary of Estimated Fair Value of Market-Based PSUs	The Company estimated the fair value of market-based PSUs granted using the Monte Carlo valuation model with the following assumptions: Years Ended December 31, 2017 2016 2015 Risk-free interest rate 1.51 % — % — % Expected volatility 67 % — % — % Dividend rate — % — % — %
Schedule of Stock-Based Compensation Expense	Total stock-based compensation expense, including stock-based compensation expense to non-employees, Years Ended December 31, 2017 2016 2015 Cost of revenue $ 7,676 $ 5,700 $ 2,702 Sales and marketing 35,210 25,787 11,688 Research and development 38,771 36,540 15,193 General and administrative 28,379 30,796 11,356 Total stock-based compensation expense $ 110,036 $ 98,823 $ 40,939
Non-Employees [Member]
Summary of Estimated Fair Value of Stock Options Granted	The fair value of the stock options granted is calculated at each reporting date using the Black-Scholes option pricing model with the following weighted-average assumptions as of each of the following periods ended: December 31, 2017 2016 2015 Expected term (in years) 6.3 6.1 6.4 Risk-free interest rate 2.20 % 1.40 % 1.74 % Expected volatility 29 % 47 % 45 % Dividend rate — % — % — %
ESPP [Member]
Summary of Estimated Fair Value of Common Shares to be Issued under ESPP	The following table summarizes the assumptions used in the Black-Scholes option pricing model to determine fair value of the Company’s common shares to be issued under the ESPP: Years Ended December 31, 2017 2016 2015 Expected term (in years) 0.5-1.0 0.5-1.0 0.5-1.0 Risk-free interest rate 0.51%-1.24% 0.25%-0.70% 0.10%-0.40% Expected volatility 18%-47% 26%-52% 35%-41% Dividend rate —% —% —%
Stock Options to Purchase Common Stock [Member] | Employee [Member]
Summary of Estimated Fair Value of Stock Options Granted	The Company estimated the fair value of stock options granted using the Black-Scholes option pricing model with weighted-average assumptions as follows: Years Ended December 31, 2017 2016 2015 Expected term (in years) — — 6.0 Risk-free interest rate — % — % 1.59 % Expected volatility — % — % 44 % Dividend rate — % — % — %

Net Loss Per Share of Common 33

Net Loss Per Share of Common Stock (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
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 share and per share amounts): Years Ended December 31, 2017 2016 2015 Net loss $ (204,507 ) $ (251,688 ) $ (179,117 ) Weighted-average shares used in computing net loss per share of common stock 66,356,474 57,203,067 43,318,044 Net loss per share, basic and diluted $ (3.08 ) $ (4.40 ) $ (4.13 )
Outstanding Shares of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share	The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been anti-dilutive: As of December 31, 2017 2016 2015 Common stock warrants 3,250,000 3,250,000 3,250,000 Exercise and conversion of common stock warrants 476,368 476,368 476,368 Common stock subject to repurchase 10,500 30,708 55,603 Outstanding stock options 4,490,445 7,430,094 11,552,487 Unvested restricted stock 137,919 275,835 789,982 Unvested RSUs 9,579,841 10,836,508 5,169,301 Unvested PSUs 839,857 424,503 683,318 Estimated ESPP shares to be issued 292,978 442,992 151,468 Total 19,077,908 23,167,008 22,128,527

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of Income Tax Expense	The components of income tax expense for the years ended December 31, 2017, 2016 and 2015 are as follows (in thousands): Years Ended December 31, 2017 2016 2015 Current: Federal $ — $ — $ — State and local 23 67 58 Foreign 2,793 1,130 514 Total current tax expense 2,816 1,197 572 Total deferred tax (benefit) expense (330 ) 27 (140 ) Income tax expense $ 2,486 $ 1,224 $ 432
Components of Loss before Income Taxes by United States and Foreign Jurisdictions	The components of loss before income taxes by United States and foreign jurisdictions are as follows (in thousands): Years Ended December 31, 2017 2016 2015 United States $157,688 $209,882 $137,713 Foreign 44,333 40,582 40,972 Loss before income tax $ 202,021 $ 250,464 $ 178,685
Components of Deferred Tax Assets	Significant components of the Company’s deferred tax assets are as follows (in thousands): December 31, 2017 2016 Deferred tax assets: Net operating loss carryforwards $ 136,596 $ 132,744 Research and development credits 14,445 8,997 Warrant expense 12,528 19,312 Depreciation and amortization 1,191 1,105 Accruals and reserves 1,206 3,005 Deferred revenue 14,000 9,093 Stock-based compensation expense 8,412 15,865 Other 1,145 2,037 Gross deferred tax assets 189,523 192,158 Valuation allowance (189,298 ) (192,152 ) Intangibles (201 ) (312 ) Net deferred tax assets (liabilities) $ 24 $ (306 )
Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate	The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate: Years Ended December 31, 2017 2016 2015 Tax at federal statutory rate 34.00 % 34.00 % 34.00 % State and local taxes, net of federal benefit 2.28 2.54 2.93 Permanent differences and other items not individually material (0.16 ) (0.08 ) (0.26 ) Stock-based compensation expense 1.39 (8.24 ) (2.29 ) Credits 2.24 2.01 0.62 Foreign tax differential (8.68 ) (5.97 ) (8.01 ) Change in valuation allowance 1.41 (24.75 ) (27.23 ) Change in federal tax rate (40.86 ) — — Adoption of ASU 2016-09 7.15 — — Income tax expense (1.23 )% (0.49 )% (0.24 )%
Unrecognized Tax Benefits	A reconciliation of the Company’s unrecognized tax benefits is as follows (in thousands): Balance as of December 31, 2015 $ 1,585 Increases related to prior years’ tax positions 875 Increases related to current year’s tax positions 1,076 Balance as of December 31, 2016 3,536 Increases related to prior years’ tax positions 333 Increases related to current year’s tax positions 1,444 Balance as of December 31, 2017 $ 5,313

Segment and Geographical Info35

Segment and Geographical Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Summary of Revenue by Customer Domicile	The following table summarizes the Company’s revenue by customer domicile (in thousands): Years Ended December 31, 2017 2016 2015 United States $187,926 $137,933 $105,842 United Kingdom 21,929 21,025 3,815 Rest of world 51,955 25,503 12,287 Total revenue $ 261,810 $ 184,461 $ 121,944
Summary of Tangible Long-lived Assets by Country	The following table summarizes the Company’s tangible long-lived assets by country (in thousands): December 31, 2017 2016 United States $ 10,671 $ 15,838 Ireland 2,120 2,033 India 2,578 471 Rest of world 1,014 1,039 Total property and equipment, net $ 16,383 $ 19,381

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Summary of Common Stock Shares/Warrants Owned by Related Parties	The following table summarizes the Company’s common stock shares/warrants owned by entities that were related parties as of December 31, 2017, 2016 and 2015. See Note 9—“Stockholders’ (Deficit) Equity” for information regarding the terms of the Altaba (formerly, Yahoo!) warrants issued in July 2011 and June 2014. December 31, 2017 Altaba Shares/warrants owned by related party: Common stock 3,845,806 Common stock warrants 3,726,368 December 31, Altaba Shares/warrants owned by related party: Common stock 3,845,806 Common stock warrants 3,726,368 December 31, 2015 Altaba Teradata AT&T Hewlett Shares/warrants owned by related party: Common stock 3,845,806 — 15,269 2,051,349 Common stock warrants 3,726,368 — — —

Organization and Description 37

Organization and Description of Business - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Feb. 29, 2016	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Percentage of open-source global data management solutions delivered		100.00%
Common Stock [Member]
Class of Stock [Line Items]
Stock issued during period			9,688,750
Common Stock [Member] | Follow-On Public Offering [Member]
Class of Stock [Line Items]
Stock issued during period	9,688,750
Common stock price per share	$ 9.50
Net cash proceeds from public offering	$ 88.2
Common Stock [Member] | Follow-On Public Offering [Member] | Option to purchase additional shares [Member]
Class of Stock [Line Items]
Stock issued during period	1,263,750

Summary of Significant Accoun38

Summary of Significant Accounting Policies - Additional Information (Detail)	Jan. 01, 2018USD ($)	Jan. 01, 2017USD ($)	Dec. 31, 2017USD ($)Customer	Dec. 31, 2016USD ($)Customer	Dec. 31, 2015USD ($)Customer
Class of Stock [Line Items]
Number of customers who represent 10 percent or more of the Company's total revenue | Customer			0	0	0
Number of customers who represent 10 percent or more of the Company's gross accounts receivable | Customer			0	0
Capitalized software development costs			$ 0	$ 0
Impairment of goodwill			0
Impairment of promissory note receivable				2,683,000
Advertising expense			8,900,000	9,100,000	$ 11,100,000
Gain (loss) on remeasurement of foreign currency			$ 3,100,000
Accounting Standards Update 2016-09 [Member]
Class of Stock [Line Items]
Cumulative-effect adjustment decrease in accumulated deficit		$ 651,000
Accounting Standards Update 2016-09 [Member] | Domestic Tax Authority [Member]
Class of Stock [Line Items]
Adoption of new accounting standard, effect of previously unrecognized deferred tax assets		38,400,000
Accounting Standards Update 2016-09 [Member] | State [Member]
Class of Stock [Line Items]
Adoption of new accounting standard, effect of previously unrecognized deferred tax assets		$ 24,400,000
Computer Software, Intangible Asset [Member]
Class of Stock [Line Items]
Property and equipment, useful lives			2 years
Fair Value, Measurements, Nonrecurring [Member] | Long-term investments [Member] | Promissory note receivable [Member]
Class of Stock [Line Items]
Impairment of promissory note receivable				$ 2,683,000
Network and Communication Equipment [Member]
Class of Stock [Line Items]
Property and equipment, useful lives			5 years
Furniture and Fixtures [Member]
Class of Stock [Line Items]
Property and equipment, useful lives			5 years
Minimum [Member]
Class of Stock [Line Items]
Available for sale maturity term			3 months
Minimum [Member] | Computer Equipment [Member]
Class of Stock [Line Items]
Property and equipment, useful lives			2 years
Minimum [Member] | Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member]
Class of Stock [Line Items]
Cumulative-effect adjustment decrease in accumulated deficit	$ 23,000,000
Minimum [Member] | Subsequent Event [Member] | Accounting Standards Codification 340-40 [Member]
Class of Stock [Line Items]
Cumulative-effect adjustment decrease in accumulated deficit	47,000,000
Minimum [Member] | Revenue [Member] | Customer Concentration Risk [Member]
Class of Stock [Line Items]
Customer concentration risk, percentage			10.00%
Minimum [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Class of Stock [Line Items]
Customer concentration risk, percentage			10.00%
Maximum [Member]
Class of Stock [Line Items]
Available for sale maturity term			1 year
Maximum [Member] | Computer Equipment [Member]
Class of Stock [Line Items]
Property and equipment, useful lives			3 years
Maximum [Member] | Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member]
Class of Stock [Line Items]
Cumulative-effect adjustment decrease in accumulated deficit	28,000,000
Maximum [Member] | Subsequent Event [Member] | Accounting Standards Codification 340-40 [Member]
Class of Stock [Line Items]
Cumulative-effect adjustment decrease in accumulated deficit	$ 52,000,000

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Available-for-sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Costs	$ 18,666	$ 35,876
Gross Unrealized Gains	4	4
Gross Unrealized Losses	(2)	(32)
Estimated Fair Value	18,668	35,848
U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Costs		2,072
Estimated Fair Value		2,072
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Costs	750	960
Estimated Fair Value	750	960
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Costs	3,498	2,497
Gross Unrealized Losses	(1)
Estimated Fair Value	3,497	2,497
Corporate Notes and Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Costs	5,806	30,347
Gross Unrealized Gains		4
Gross Unrealized Losses	(1)	(32)
Estimated Fair Value	5,805	$ 30,319
U.S. Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Costs	8,612
Gross Unrealized Gains	4
Estimated Fair Value	$ 8,616

Fair Value Measurements - Contr

Fair Value Measurements - Contractual Maturities of Investments in Available-for-sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities, Debt Maturities [Abstract]
Due within one year, Gross Amortized Cost	$ 18,666	$ 31,792
Due after one year through five years, Gross Amortized Cost		4,084
Gross Amortized Costs	18,666	35,876
Due within one year, Fair Value	18,668	31,764
Due after one year through five years, Fair Value		4,084
Total investments in available-for-sale securities, Fair Value	$ 18,668	$ 35,848

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets Measured on Recurring Basis by Level within Fair Value Hierarchy (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 44,615	$ 60,381
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	25,947	24,533
U.S. Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		2,072
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	750	960
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,497
Commercial Paper Not Included with Cash and Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		2,497
Corporate Notes and Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,799
Short-term investments	4,006	26,235
Long-term investments		4,084
U.S. Treasury Bills [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,599
Short-term investments	5,017
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	34,563	24,533
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	10,052	35,848
Recurring [Member] | Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	25,947	24,533
Recurring [Member] | U.S. Government Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		2,072
Recurring [Member] | Certificates of Deposit [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	750	960
Recurring [Member] | Commercial Paper [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,497
Recurring [Member] | Commercial Paper Not Included with Cash and Cash Equivalents [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		2,497
Recurring [Member] | Corporate Notes and Bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,799
Short-term investments	4,006	26,235
Long-term investments		$ 4,084
Recurring [Member] | U.S. Treasury Bills [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,599
Short-term investments	$ 5,017

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2015	Dec. 31, 2016	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of promissory note receivable and related interest receivable		$ 2,683,000
Securities, unrealized loss position for more than 12 months		$ 0	$ 0
Promissory Note Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes receivable interest rate	4.00%
Promissory note receivable term	3 years
Fair Value, Measurements, Nonrecurring [Member] | Long-term investments [Member] | Promissory Note Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes receivable	$ 2,500,000

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ in Thousands	Aug. 31, 2015USD ($)shares	Apr. 23, 2015USD ($)shares	Dec. 31, 2017USD ($)Business	Dec. 31, 2016USD ($)Business	Dec. 31, 2015USD ($)	Jan. 31, 2016USD ($)
Business Acquisition [Line Items]
Number of business acquired | Business			0	0
Business acquisition, goodwill			$ 34,333	$ 34,333
Business acquisition, value of shares exchanged					$ 27,593
Onyara, Inc. [Member]
Business Acquisition [Line Items]
Date of business acquisition			Aug. 31, 2015
Business acquisition, purchase price	$ 26,514
Business acquisition, goodwill	$ 26,429
Business acquisition, shares issued | shares	1,600,000
Business acquisition, value of shares exchanged	$ 38,500
Business acquisition, number of shares issued as consideration | shares	1,100,000
Business combination, number of shares considered as post-combination remuneration | shares	500,000
Business combination, value of shares considered as post-combination remuneration	$ 12,000
Business acquisition costs					$ 400
Business combination, Consideration allocated	$ 26,514
Onyara, Inc. [Member] | RSUs [Member]
Business Acquisition [Line Items]
Business acquisition, shares issued | shares	200,000
Business acquisition, value of shares exchanged	$ 5,200
Shares, vesting period	3 years
Onyara, Inc. [Member] | Maximum [Member] | RSUs [Member]
Business Acquisition [Line Items]
Shares, vesting period	3 years
SequenceIQ [Member]
Business Acquisition [Line Items]
Date of business acquisition			Apr. 23, 2015
Business acquisition, purchase price		$ 9,951
Business acquisition, goodwill		$ 5,785
Percentage of voting shares acquired		100.00%
Contingent consideration		$ 1,625
Deferred tax liability recognized in the acquisition		420
Business combination, Consideration allocated		9,951
SequenceIQ [Member] | Contingent Consideration [Member]
Business Acquisition [Line Items]
Fair value of contingent consideration liability						$ 1,700
SequenceIQ [Member] | Developed technology [Member]
Business Acquisition [Line Items]
Developed technology		$ 4,395
SequenceIQ [Member] | RSUs [Member]
Business Acquisition [Line Items]
Business acquisition, shares issued | shares		114,583
SequenceIQ [Member] | Maximum [Member] | RSUs [Member]
Business Acquisition [Line Items]
Shares, vesting period		3 years

Business Combinations - Summary

Business Combinations - Summary of Acquisition Date Fair Value of Purchase Consideration (Detail) - USD ($) $ in Thousands	Aug. 31, 2015	Apr. 23, 2015
Onyara, Inc. [Member]
Business Acquisition [Line Items]
Total	$ 26,514
Onyara, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Equity stock	21,898
Holdback of 194,259 shares of common stock for a period of 12 months for general representations and warranties	$ 4,616
SequenceIQ [Member]
Business Acquisition [Line Items]
Total		$ 9,951
Cash		3,721
Cash holdback for a period of 15 months for general representations and warranties		1,875
Cash payable upon 18-month anniversary of closing date		1,651
Contingent consideration		1,625
SequenceIQ [Member] | Vested Restricted Stock Units [Member]
Business Acquisition [Line Items]
Equity stock		$ 1,079

Business Combinations - Summa45

Business Combinations - Summary of Acquisition Date Fair Value of Purchase Consideration (Parenthetical) (Detail) - $ / shares	Aug. 31, 2015	Apr. 23, 2015
Onyara, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, number of shares issued as consideration	1,100,000
Onyara, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Business acquisition, number of shares issued as consideration	921,643
Business acquisition, fair value of shares issued per share	$ 23.76
Business acquisition, number of shares holdback	194,259
Business acquisition, shares holdback period	12 months
SequenceIQ [Member]
Business Acquisition [Line Items]
Business acquisition, cash holdback period		15 months
Business acquisition, Cash payable period		18 months
Vested Restricted Stock Units [Member] | SequenceIQ [Member]
Business Acquisition [Line Items]
Business acquisition, number of shares issued as consideration		49,102
Business acquisition, fair value of shares issued per share		$ 21.97

Business Combinations - Summa46

Business Combinations - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Apr. 23, 2015	Dec. 31, 2017	Dec. 31, 2016	Aug. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 34,333	$ 34,333
Onyara, Inc. [Member]
Business Acquisition [Line Items]
Goodwill				$ 26,429
Cash				180
Tangible liabilities acquired				(95)
Total				$ 26,514
SequenceIQ [Member]
Business Acquisition [Line Items]
Tangible assets acquired, net	$ 191
Goodwill	5,785
Deferred tax liabilities, net	(420)
Total	9,951
SequenceIQ [Member] | Developed technology [Member]
Business Acquisition [Line Items]
Developed technology	$ 4,395

Property and Equipment, Net - P

Property and Equipment, Net - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Capital leases	$ 743	$ 476
Property and equipment, gross	37,440	32,771
Less: Accumulated depreciation	(21,057)	(13,390)
Total property and equipment, net	16,383	19,381
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,353	12,513
Network and Communication Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,889	3,453
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	898	667
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,356	4,585
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,003	10,871
Assets Not Yet in Use [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 198	$ 206

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 8,786	$ 7,244	$ 4,499
Capital lease future payments due, 2018	$ 400

Intangible Assets, Net - Summar

Intangible Assets, Net - Summary of Intangible Assets, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 4,395	$ 4,395
Intangible assets, Accumulated Amortization	(2,153)	(1,274)
Intangible assets, Net	2,242	3,121
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	4,395	4,395
Intangible assets, Accumulated Amortization	(2,153)	(1,274)
Intangible assets, Net	$ 2,242	$ 3,121

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 879	$ 881	$ 393
Estimated amortization expense, 2018	900
Estimated amortization expense, 2019	900
Estimated amortization expense, 2020	500
Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 879	$ 881	$ 393
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life	5 years

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Lessee, Lease, Description [Line Items]
Operating lease agreement description	The Company has a number of operating lease agreements primarily involving office space and data center facilities. These leases are non-cancelable with original lease periods up to 15 years, which expire between 2017 and 2031. Some of these operating lease agreements have free or adjustable rent provisions. Lease expense is recognized on a straight-line basis over the lease term. The Company subleases some excess capacity to subtenants under non-cancelable operating leases.
Rent expense incurred under operating leases	$ 9	$ 9.9	$ 8
Maximum [Member]
Lessee, Lease, Description [Line Items]
Non-cancelable operating leases period	15 years
Non-cancelable operating lease expiration year	2,031
Minimum [Member]
Lessee, Lease, Description [Line Items]
Non-cancelable operating lease expiration year	2,018

Commitments and Contingencies52

Commitments and Contingencies - Future Minimum Lease Commitments (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 5,942
2,019	2,741
2,020	1,702
2,021	1,097
2,022	429
Thereafter	3,735
Gross lease payments	15,646
Less: Non-cancelable subtenant receipts	(604)
Net lease payments	$ 15,042

Debt - Revolving Credit Agreeme

Debt - Revolving Credit Agreement - Additional Information (Detail) - Senior Secured Revolving Credit Agreement [Member] - USD ($)	Nov. 01, 2017	Nov. 02, 2016	Dec. 31, 2017
Debt Instrument [Line Items]
Maximum borrowing capacity under credit agreement	$ 50,000,000	$ 30,000,000
Credit agreement initiation date	Nov. 1, 2017	Nov. 2, 2016
Credit agreement term		2 years
Annual commitment fee percentage	0.50%
Unused commitment fee percentage per annum	0.45%
Required minimum balance on account with the Bank	$ 15,000,000
Borrowings outstanding under credit agreement			$ 0
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate per annum	3.50%

Stockholders' (Deficit) Equit54

Stockholders' (Deficit) Equity - Additional Information (Detail)

Jan. 01, 2017shares

Jan. 01, 2015shares

Sep. 30, 2017shares

May 31, 2016shares

Feb. 29, 2016shares

Oct. 31, 2015shares

Mar. 31, 2014

Jul. 31, 2015shares

Dec. 31, 2017USD ($)Vote$ / sharesshares

Dec. 31, 2016USD ($)$ / sharesshares

Dec. 31, 2015USD ($)$ / sharesshares

Aug. 31, 2015shares

Dec. 31, 2014shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common stock voting description

Each share of common stock is entitled to one vote for matters to be voted on by the stockholders of the Company.

Number of votes for each share of common stock | Vote

1

Number of shares outstanding

4,490,445

7,430,094

Shares reserved for issuance

21,425,267

29,409,436

Options to purchase common stock granted, weighted average grant date fair value | $ / shares

$ 23.17

Options granted, Number of shares underlying

0

0

Aggregate intrinsic value of options exercised | $

$ 23,500,000

$ 13,200,000

$ 42,900,000

Cash received from option exercises | $

12,100,000

Unrecognized stock-based compensation expense | $

$ 4,600,000

Dividend rate

0.00%

Options outstanding, weighted average exercise price | $ / shares

$ 11.08

$ 9.81

Number of shares canceled

662,470

Non-Employees [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares outstanding

38,533

59,677

Weighted-average grant date fair value of restricted stock units granted | $ / shares

$ 13.04

$ 8.99

$ 21.71

Weighted-average grant date fair value of restricted stock | $ / shares

15.04

9.52

Options outstanding, weighted average exercise price | $ / shares

$ 3.23

$ 2.29

Restricted stock units outstanding

9,783

95,529

Stock-based compensation expense | $

$ 500,000

$ 1,300,000

$ 600,000

Executive Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares canceled

1,185,000

Executive Officer [Member] | General and Administrative [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation expense | $

10,000,000

Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation, recognition period

7 months 24 days

Fair value that vested | $

$ 1,900,000

$ 1,500,000

0

Unrecognized stock-based compensation expense | $

$ 6,700,000

Weighted-average grant date fair value of restricted stock units granted | $ / shares

$ 13.39

Weighted-average grant date fair value of restricted stock | $ / shares

$ 14.58

$ 21.16

Performance Shares [Member] | April, June and July [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Service period

3 years

Unvested Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation, recognition period

8 months 5 days

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation, recognition period

8 months 2 days

Fair value that vested | $

$ 2,300,000

$ 4,500,000

Unrecognized stock-based compensation expense | $

$ 2,200,000

Weighted-average grant date fair value of restricted stock units granted | $ / shares

$ 0

Weighted-average grant date fair value of restricted stock | $ / shares

$ 23.76

$ 23.76

Restricted Stock [Member] | Vesting Over Requisite Service Period [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value that vested | $

14,400,000

Restricted Stock [Member] | Fully vested restricted stock issued on acquisition [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value that vested | $

26,500,000

RSUs [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation, recognition period

1 year 7 months 24 days

Fair value that vested | $

$ 113,100,000

$ 25,300,000

Unrecognized stock-based compensation expense | $

$ 106,100,000

Weighted-average grant date fair value of restricted stock units granted | $ / shares

$ 12.60

Weighted-average grant date fair value of restricted stock | $ / shares

$ 13.10

$ 12.90

RSUs [Member] | Vesting Over Requisite Service Period [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value that vested | $

1,100,000

RSUs [Member] | Fully vested RSUs issued on acquisition [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fair value that vested | $

$ 1,100,000

RSUs [Member] | Non-Employees [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of Shares Issued, Granted

13,200

193,000

7,416

Restricted Stock and Stock Options Subject to Repurchase [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares of restricted stock and early exercised options subject to the Company's right of repurchase

10,500

30,708

Liability for shares subject to repurchase | $

$ 100,000

$ 400,000

Restricted Stock and Stock Options Subject to Repurchase [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Repurchase price per share | $ / shares

$ 14.22

$ 14.22

Restricted Stock and Stock Options Subject to Repurchase [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Repurchase price per share | $ / shares

$ 8.46

$ 8.46

2014 Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, percentage of options granted to stockholder

10.00%

Share option, vesting period description

In general, RSUs granted to employees and non-employees typically vest over no more than three years.

Shares reserved for issuance

706,994

4,234,205

6,000,000

Percentage of increase in shares of common stock on the immediately preceding December 31, reserved and available for issuance, per year

5.00%

2014 Plan [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, vesting period

3 years

2014 Plan [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, exercise price as a percentage of fair market value

100.00%

2014 Plan [Member] | Ten Percent Shareholders [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, exercise price as a percentage of fair market value

110.00%

2014 Plan [Member] | Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of Shares Issued, Granted

266,084

421,484

2014 Plan [Member] | Performance Shares [Member] | October [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Performance cycle

12 months

2014 Plan [Member] | Performance Shares [Member] | October [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Service period

2 years

2014 Plan [Member] | Incentive Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, expiration period

10 years

Share option, vesting period description

ISOs granted under the Amended 2014 Plan generally vest 25 percent after the completion of 12 months of service and the balance in equal monthly installments over the next 36 months of service, and expire 10 years from the date of grant (subject to earlier expiration upon occurrence of certain events). ISOs granted to a 10 percent stockholder expire five years from the date of grant (subject to earlier expiration upon occurrence of certain events)

2014 Plan [Member] | Incentive Stock Options [Member] | Vesting During Initial Period [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, percentage of vesting

25.00%

Shares, vesting period

12 months

2014 Plan [Member] | Incentive Stock Options [Member] | Vesting After Initial Period [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares, vesting period

36 months

2014 Plan [Member] | Incentive Stock Options [Member] | Ten Percent Shareholders [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, expiration period

5 years

2014 Plan [Member] | Non Statutory Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, expiration period

10 years

2011 Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares available for issuance

923,732

2011 Plan [Member] | Restricted Stock and Stock Options Subject to Repurchase [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares repurchase percentage on original grant amount shares

2.08333%

Shares repurchase period

4 years

Amended 2014 Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares available for issuance

706,994

Shares reserved for issuance

22,606,183

Annual increase in number of shares reserved and available for issuance

3,071,470

7,000,000

Amended 2014 Plan [Member] | Performance Shares [Member] | Chief Executive Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of Shares Issued, Granted

714,711

Performance cycle

4 years

Consecutive trading period

40 days

Amended 2014 Plan [Member] | Performance Shares [Member] | Chief Executive Officer [Member] | Vesting Based On Performance [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock based compensation vesting percentage

100.00%

Amended 2014 Plan [Member] | Stock Option, RSUs, and PSUs [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares outstanding

10,973,357

ESPP [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares available for issuance

1,933,343

Shares reserved for issuance

1,933,343

2,451,215

Percentage of increase in shares of common stock on the immediately preceding December 31, reserved and available for issuance, per year

1.00%

Annual increase in number of shares reserved and available for issuance

614,294

Stock-based compensation, recognition period

3 months 26 days

Unrecognized stock-based compensation expense | $

$ 1,400,000

Maximum percentage of salary allowed to be deducted for purchase of each employee on base compensation

15.00%

Percentage of share purchase price on fair market value

85.00%

Maximum value of common stock shares allowed to purchase per employee | $

$ 25,000

Cash received from option exercises | $

$ 7,400,000

ESPP [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Annual increase in number of shares reserved and available for issuance

1,000,000

Initially reserved and authorized shares

2,500,000

ESPP [Member] | Two Thousand Seventeen Reserve [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares reserved for issuance

4,006,767

2011 Option Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, percentage of options granted to stockholder

10.00%

Number of shares outstanding

3,936,786

Shares available for issuance

0

2011 Option Plan [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, exercise price as a percentage of fair market value

100.00%

2011 Option Plan [Member] | Ten Percent Shareholders [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, exercise price as a percentage of fair market value

110.00%

2011 Option Plan [Member] | Incentive Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, expiration period

10 years

Share option, vesting period description

ISOs granted under the 2011 Plan generally vest 25 percent after the completion of 12 months of service and the balance in equal monthly installments over the next 36 months of service, and expire 10 years from the date of grant (subject to earlier expiration upon the occurrence of certain events). ISOs granted to a 10 percent stockholder expire five years from the date of grant (subject to earlier expiration upon the occurrence of certain events)

2011 Option Plan [Member] | Incentive Stock Options [Member] | Vesting During Initial Period [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share option, percentage of vesting

25.00%

Shares, vesting period

12 months

2011 Option Plan [Member] | Incentive Stock Options [Member] | Vesting After Initial Period [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares, vesting period

36 months

2011 Option Plan [Member] | Incentive Stock Options [Member] | Ten Percent Shareholders [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, expiration period

5 years

2011 Option Plan [Member] | Non Statutory Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, expiration period

10 years

Stockholders' (Deficit) Equit55

Stockholders' (Deficit) Equity - Common Stock Reserved for Issuance (Detail) - shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	21,425,267	29,409,436
2014 Plan [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	706,994	4,234,205	6,000,000
ESPP [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	1,933,343	2,451,215
Common Stock Warrants [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	3,250,000	3,250,000
Exercise and Conversion of Common Stock Warrants [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	476,368	476,368
Common Stock Subject to Repurchase [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	10,500	30,708
Outstanding Stock Options [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	4,490,445	7,430,094
Unvested Restricted Stock [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	137,919	275,835
Unvested RSUs [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	9,579,841	10,836,508
Unvested PSUs [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total common stock reserved for issuance	839,857	424,503

Stockholders' (Deficit) Equit56

Stockholders' (Deficit) Equity - Summary of Information Related to Stock Options (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Stock Option Activity
Number of Shares Underlying Outstanding Options, beginning balance	7,430,094
Number of Shares Underlying Outstanding Options, Options granted	0	0
Number of Shares Underlying Outstanding Options, Options exercised	(2,277,179)
Number of Shares Underlying Outstanding Options, Options canceled/forfeited	(662,470)
Number of Shares Underlying Outstanding Options, ending balance	4,490,445	7,430,094
Number of Shares Underlying Outstanding Options, Exercisable-December 31, 2017	3,879,080
Weighted-Average Exercise Price, beginning balance	$ 9.81
Weighted-Average Exercise Price, Options granted	0
Weighted-Average Exercise Price, Options exercised	5.30
Weighted-Average Exercise Price, Options canceled/forfeited	16.74
Weighted-Average Exercise Price, ending balance	11.08	$ 9.81
Weighted-Average Exercise Price, Exercisable-December 31, 2017	$ 10.38
Weighted-Average Remaining Contractual Life (Years)	6 years 1 month 20 days	6 years 8 months 23 days
Weighted-Average Remaining Contractual Life (Years), Exercisable-December 31, 2017	6 years 18 days
Aggregate Intrinsic Value, Outstanding balance	$ 41,525	$ 16,523
Aggregate Intrinsic Value, Exercisable-December 31, 2017	$ 38,393

Stockholders' (Deficit) Equit57

Stockholders' (Deficit) Equity - Summary of Information Related to Restricted Stock (Detail) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Restricted Stock Activity
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares	$ 23.76
Weighted Average Grant Date Fair Value, Granted | $ / shares	0
Weighted Average Grant Date Fair Value, Vested | $ / shares	23.76
Weighted Average Grant Date Fair Value, Canceled/forfeited | $ / shares	0
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares	$ 23.76
Outside the Stock Options Plans [Member]
Restricted Stock Activity
Number of Shares Issued, Unvested beginning balance | shares	275,835
Number of Shares Issued, Granted | shares	0
Number of Shares Issued, Vested | shares	(137,916)
Number of Shares Issued, Canceled/forfeited | shares	0
Number of Shares Issued, Unvested ending balance | shares	137,919

Stockholders' (Deficit) Equit58

Stockholders' (Deficit) Equity - Summary of Information Related to Restricted Stock (Parenthetical) (Detail) - Onyara, Inc. [Member] - shares	Aug. 31, 2015	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business acquisition, shares issued	1,600,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business acquisition, shares issued	1,424,946
Number of shares unvested		137,919

Stockholders' (Deficit) Equit59

Stockholders' (Deficit) Equity - Summary of Information Related to RSUs (Detail) - RSUs [Member]	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares	$ 12.90
Weighted-average grant date fair value per share, granted shares | $ / shares	12.60
Weighted-average grant date fair value per share, vested shares | $ / shares	12.73
Weighted-average grant date fair value per share, canceled/forfeited shares | $ / shares	11.70
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares	$ 13.10
Under the Stock Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Issued, Unvested beginning balance | shares	10,836,508
Number of Shares Issued, Granted | shares	9,463,870
Number of Shares Issued, Vested | shares	(7,919,416)
Number of Shares Issued, Cancelled/forfeited | shares	(2,801,121)
Number of Shares Issued, Unvested ending balance | shares	9,579,841

Stockholders' (Deficit) Equit60

Stockholders' (Deficit) Equity - Summary of Information Related to PSUs (Detail) - Performance Shares [Member]	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares	$ 21.16
Weighted-average grant date fair value per share, granted shares | $ / shares	13.39
Weighted-average grant date fair value per share, vested shares | $ / shares	15.87
Weighted-average grant date fair value per share, canceled/forfeited shares | $ / shares	23.26
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares	$ 14.58
Under the Stock Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Issued, Unvested beginning balance | shares	424,503
Number of Shares Issued, Granted | shares	714,711
Number of Shares Issued, Vested | shares	(183,048)
Number of Shares Issued, Cancelled/forfeited | shares	(116,309)
Number of Shares Issued, Unvested ending balance | shares	839,857

Stockholders' (Deficit) Equit61

Stockholders' (Deficit) Equity - Summary of Estimated Fair Value of Stock Options Granted (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement Assumptions Used To Estimate Fair Values Of Share Options Granted [Line Items]
Dividend rate	0.00%
ESPP [Member] | Black-Scholes Option Pricing Model.
Share Based Compensation Arrangement Assumptions Used To Estimate Fair Values Of Share Options Granted [Line Items]
Dividend rate	0.00%	0.00%	0.00%
ESPP [Member] | Black-Scholes Option Pricing Model. | Minimum [Member]
Share Based Compensation Arrangement Assumptions Used To Estimate Fair Values Of Share Options Granted [Line Items]
Expected term (in years)	6 months	6 months	6 months
Risk-free interest rate	0.51%	0.25%	0.10%
Expected volatility	18.00%	26.00%	35.00%
Dividend rate	0.00%	0.00%	0.00%
ESPP [Member] | Black-Scholes Option Pricing Model. | Maximum [Member]
Share Based Compensation Arrangement Assumptions Used To Estimate Fair Values Of Share Options Granted [Line Items]
Expected term (in years)	1 year	1 year	1 year
Risk-free interest rate	1.24%	0.70%	0.40%
Expected volatility	47.00%	52.00%	41.00%
Dividend rate	0.00%	0.00%	0.00%
Stock Options to Purchase Common Stock [Member] | Black-Scholes Option Pricing Model.
Share Based Compensation Arrangement Assumptions Used To Estimate Fair Values Of Share Options Granted [Line Items]
Expected term (in years)			6 years
Risk-free interest rate			1.59%
Expected volatility			44.00%
Dividend rate	0.00%	0.00%	0.00%
Market-Based PSUs [Member] | Monte Carlo Valuation Model [Member]
Share Based Compensation Arrangement Assumptions Used To Estimate Fair Values Of Share Options Granted [Line Items]
Risk-free interest rate	1.51%
Expected volatility	67.00%
Dividend rate	0.00%	0.00%	0.00%
Non Employee Stock Option [Member] | Black-Scholes Option Pricing Model.
Share Based Compensation Arrangement Assumptions Used To Estimate Fair Values Of Share Options Granted [Line Items]
Expected term (in years)	6 years 3 months 19 days	6 years 1 month 6 days	6 years 4 months 24 days
Risk-free interest rate	2.20%	1.40%	1.74%
Expected volatility	29.00%	47.00%	45.00%
Dividend rate	0.00%	0.00%	0.00%

Stockholders' (Deficit) Equit62

Stockholders' (Deficit) Equity - Schedule of Stock-Based Compensation Expense (Detail) - Employee and Non-Employee [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 110,036	$ 98,823	$ 40,939
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	7,676	5,700	2,702
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	35,210	25,787	11,688
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	38,771	36,540	15,193
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 28,379	$ 30,796	$ 11,356

Stockholders' (Deficit) Equit63

Stockholders' (Deficit) Equity - Warrants - Additional Information (Detail) - $ / shares	1 Months Ended		12 Months Ended
	Jun. 30, 2014	Jul. 31, 2011	Dec. 31, 2017
Class of Warrant or Right [Line Items]
Warrant exercised			0
Class of Warrant Pre IPO Series A Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Warrant expiration period		9 years
Class of Warrant Pre IPO Series A Preferred Stock [Member] | Yahoo! Inc. [Member]
Class of Warrant or Right [Line Items]
Number of shares into which the warrant may be converted		6,500,000	3,250,000
Common stock warrants, exercise price per share		$ 0.005
Class of Warrant Pre IPO Series D Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Warrant expiration period	9 years
Class of Warrant Pre IPO Series D Preferred Stock [Member] | Yahoo! Inc. [Member]
Class of Warrant or Right [Line Items]
Number of shares into which the warrant may be converted			476,368
Common stock warrants, exercise price per share	$ 8.46
Number of shares identified as a component for the calculation of common shares into which the warrant may be converted	45,585,496
Class of Warrant Pre IPO Series D Preferred Stock [Member] | Yahoo! Inc. [Member] | Maximum [Member]
Class of Warrant or Right [Line Items]
Percentage of shares for determining the number of common shares into which the warrant may be converted	1.00%

Net Loss Per Share of Common 64

Net Loss Per Share of Common Stock - Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net loss	$ (204,507)	$ (251,688)	$ (179,117)
Weighted-average shares used in computing net loss per share of common stock	66,356,474	57,203,067	43,318,044
Net loss per share, basic and diluted	$ (3.08)	$ (4.40)	$ (4.13)

Net Loss Per Share of Common 65

Net Loss Per Share of Common Stock - Outstanding Shares of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	19,077,908	23,167,008	22,128,527
Common Stock Warrants [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	3,250,000	3,250,000	3,250,000
Exercise and Conversion of Common Stock Warrants [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	476,368	476,368	476,368
Common Stock Subject to Repurchase [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	10,500	30,708	55,603
Employee And Non Employee Outstanding Options [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	4,490,445	7,430,094	11,552,487
Unvested Restricted Stock [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	137,919	275,835	789,982
Unvested RSUs [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	9,579,841	10,836,508	5,169,301
Unvested PSUs [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	839,857	424,503	683,318
Estimated ESPP Shares to be Issued [Member]
Antidilutive Securities Excluded from the Computation of Dilutive Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share of common stock	292,978	442,992	151,468

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 0	$ 0	$ 0
State and local	23	67	58
Foreign	2,793	1,130	514
Total current tax expense	2,816	1,197	572
Total deferred tax (benefit) expense	(330)	27	(140)
Income tax expense	$ 2,486	$ 1,224	$ 432

Income Taxes - Components of Lo

Income Taxes - Components of Loss before Income Taxes by United States and Foreign Jurisdictions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States	$ 157,688	$ 209,882	$ 137,713
Foreign	44,333	40,582	40,972
Loss before income tax	$ 202,021	$ 250,464	$ 178,685

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss carryforwards	$ 136,596	$ 132,744
Research and development credits	14,445	8,997
Warrant expense	12,528	19,312
Depreciation and amortization	1,191	1,105
Accruals and reserves	1,206	3,005
Deferred revenue	14,000	9,093
Stock-based compensation expense	8,412	15,865
Other	1,145	2,037
Gross deferred tax assets	189,523	192,158
Valuation allowance	(189,298)	(192,152)
Intangibles	(201)	(312)
Net deferred tax assets	$ 24
Net deferred tax liabilities		$ (306)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Tax at federal statutory rate	34.00%	34.00%	34.00%
State and local taxes, net of federal benefit	2.28%	2.54%	2.93%
Permanent differences and other items not individually material	(0.16%)	(0.08%)	(0.26%)
Stock-based compensation expense	1.39%	(8.24%)	(2.29%)
Credits	2.24%	2.01%	0.62%
Foreign tax differential	(8.68%)	(5.97%)	(8.01%)
Change in valuation allowance	1.41%	(24.75%)	(27.23%)
Change in federal tax rate	(40.86%)
Income tax expense	(1.23%)	(0.49%)	(0.24%)
Accounting Standards Update 2016-09 [Member]
Income Taxes [Line Items]
Adoption of ASU 2016-09	7.15%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
U.S. corporate federal income tax rate		34.00%	34.00%	34.00%
U.S. corporate federal income tax rate		35.00%
Decrease in valuation allowance		$ 2,900
Research and development tax credit carryforwards		14,445	$ 8,997
Unrecognized tax benefits		5,313	$ 3,536	$ 1,585
Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
U.S. corporate federal income tax rate	21.00%
Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 525,300
Operating loss carryforwards, expiration date		2,031
Research and development tax credit carryforwards		$ 11,800
Tax credits expiration year, description		The federal tax credits will expire at various dates beginning in 2031, unless previously utilized.
State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 405,700
Operating loss carryforwards, expiration date		2,018
Research and development tax credit carryforwards		$ 9,500
Tax credits expiration year, description		The state tax credits do not expire and will carry forward indefinitely until utilized.

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Beginning balance	$ 3,536	$ 1,585
Increases related to prior years' tax positions	333	875
Increases related to current year's tax positions	1,444	1,076
Ending balance	$ 5,313	$ 3,536

Segment and Geographical Info72

Segment and Geographical Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Segment
Segment Reporting [Abstract]
Number of reportable segment	1

Segment and Geographical Info73

Segment and Geographical Information - Summary of Revenue by Customer Domicile (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 261,810	$ 184,461	$ 121,944
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	187,926	137,933	105,842
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	21,929	21,025	3,815
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 51,955	$ 25,503	$ 12,287

Segment and Geographical Info74

Segment and Geographical Information - Summary of Tangible Long-lived Assets by Country (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Long Lived Assets By Geographical Areas [Line Items]
Property and equipment, net	$ 16,383	$ 19,381
United States [Member]
Long Lived Assets By Geographical Areas [Line Items]
Property and equipment, net	10,671	15,838
Ireland [Member]
Long Lived Assets By Geographical Areas [Line Items]
Property and equipment, net	2,120	2,033
India [Member]
Long Lived Assets By Geographical Areas [Line Items]
Property and equipment, net	2,578	471
Rest of World [Member]
Long Lived Assets By Geographical Areas [Line Items]
Property and equipment, net	$ 1,014	$ 1,039

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	Mar. 31, 2015	Oct. 01, 2013	Jul. 31, 2014	Sep. 30, 2013	Jun. 30, 2011	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Aug. 31, 2015	Apr. 30, 2012
Related Party Transaction [Line Items]
Common stock shares sold, value							$ 87,693,000
Revenue from sales to related parties						$ 800,000	2,638,000	$ 10,053,000
Deferred revenue from related parties						800,000	1,600,000
Accounts receivable from related parties						$ 800,000	$ 1,600,000
Common Stock [Member]
Related Party Transaction [Line Items]
Stock issued during period							9,688,750
Common stock shares sold, value							$ 2,000
Yahoo! Inc. [Member]
Related Party Transaction [Line Items]
Initial contract value					$ 2,000,000
Quarterly installment payment					$ 250,000
Description of commercial agreement					In June 2013, the commercial agreement was amended to automatically renew for an additional year on an annual basis, unless otherwise terminated by either party 60 days prior to the end of the then-current renewal period. In December 2015, the commercial agreement was further amended to extend the current term until December 30, 2018, and thereafter, the commercial agreement will automatically renew for an additional year on an annual basis, unless otherwise terminated by either party 60 days prior to the end of the then-current renewal period.
Yahoo! Inc. [Member] | Warrant Issued in June 2014 [Member]
Related Party Transaction [Line Items]
Number of shares into which the warrant may be converted						476,368
Yahoo! Inc. [Member] | Warrant Issued in July 2011 [Member]
Related Party Transaction [Line Items]
Commercial agreement period					2 years
AT&T [Member]
Related Party Transaction [Line Items]
Commercial agreement period				3 years
Related party fee recognized ratable period				3 years
AT&T [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Related party transaction, fee for services				$ 6,000,000
AT&T [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Percentage of outstanding shares of common stock owned						5.00%	5.00%
AT&T [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Stock issued during period				390,269
AT&T [Member] | Vesting During Initial Period [Member]
Related Party Transaction [Line Items]
Common stock shares vested, percentage		50.00%
Common stock shares vested, period		18 months
AT&T [Member] | Vesting After Initial Period [Member]
Related Party Transaction [Line Items]
Common stock shares vested, percentage	50.00%
Hewlett Packard [Member] | Series D preferred stock [Member] | Stock Purchase Agreement [Member]
Related Party Transaction [Line Items]
Stock issued during period			2,051,349
Common stock shares sold, value			$ 50,000,000
Teradata Corp [Member]
Related Party Transaction [Line Items]
Nonrefundable prepayment received											$ 9,500,000
Second Prepayment [Member]
Related Party Transaction [Line Items]
Nonrefundable prepayment received										$ 1,500,000
Third Prepayment [Member]
Related Party Transaction [Line Items]
Nonrefundable prepayment received									$ 1,500,000

Related Party Transactions - Su

Related Party Transactions - Summary of Common Stock Shares/Warrants Owned by Related Parties (Detail) - shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Stock owned by related party	72,607,893	61,122,863
Altaba [Member]
Related Party Transaction [Line Items]
Common stock warrants	3,726,368	3,726,368	3,726,368
Altaba [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Stock owned by related party	3,845,806	3,845,806	3,845,806
AT&T [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Stock owned by related party			15,269
Hewlett Packard [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Stock owned by related party			2,051,349

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail)	Jan. 31, 2018shares
Altaba [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of shares into which the warrant may be converted	3,522,730