Quotient Technology (QUOT) 10-K 16 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 13, 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	QUOT
Entity Registrant Name	Quotient Technology Inc.
Entity Central Index Key	1,115,128
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 Public Float			$ 634.7
Entity Common Stock, Shares Outstanding		93,384,505

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 334,635	$ 106,174
Short-term investments	59,902	69,172
Accounts receivable, net of allowance for doubtful accounts of $786 and $1,338 at December 31, 2017 and 2016, respectively	81,189	71,945
Prepaid expenses and other current assets	8,737	6,293
Total current assets	484,463	253,584
Property and equipment, net	16,610	16,376
Intangible assets, net	46,490	47,987
Goodwill	80,506	43,895
Other assets	1,006	914
Total assets	629,075	362,756
Current liabilities:
Accounts payable	6,090	4,968
Accrued compensation and benefits	13,914	13,202
Other current liabilities	35,538	20,864
Deferred revenues	6,276	6,856
Contingent consideration related to acquisitions	18,500
Total current liabilities	80,318	45,890
Other non-current liabilities	3,205	2,548
Convertible senior notes, net	145,821
Deferred tax liabilities	1,690	2,569
Total liabilities	231,034	51,007
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.00001 par value—10,000,000 shares authorized and no shares issued or outstanding at December 31, 2017 and 2016
Common stock, $0.00001 par value—250,000,000 shares authorized and 93,199,718 shares issued and outstanding at December 31, 2017; 250,000,000 shares authorized and 98,208,117 shares issued and 88,560,409 outstanding at December 31, 2016	1	1
Additional paid-in capital	686,025	647,474
Treasury stock, at cost		(96,574)
Accumulated other comprehensive loss	(700)	(748)
Accumulated deficit	(287,285)	(238,404)
Total stockholders’ equity	398,041	311,749
Total liabilities and stockholders’ equity	$ 629,075	$ 362,756

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	$ 786	$ 1,338
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	93,199,718	98,208,117
Common stock, shares outstanding	93,199,718	88,560,409

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues	$ 322,115	$ 275,190	$ 237,309
Costs and expenses:
Cost of revenues	140,752	114,870	92,203
Sales and marketing	92,833	92,596	92,454
Research and development	50,009	50,503	48,367
General and administrative	48,124	43,404	34,833
Change in fair value of escrowed shares and contingent consideration, net	5,515	(6,450)	1,231
Total costs and expenses	337,233	294,923	269,088
Loss from operations	(15,118)	(19,733)	(31,779)
Interest expense	(1,589)		(290)
Gain on sale of a right to use a web domain name			4,800
Other income (expense), net	928	495	(22)
Loss before income taxes	(15,779)	(19,238)	(27,291)
Provision for (benefit from) income taxes	(702)	241	(561)
Net loss	$ (15,077)	$ (19,479)	$ (26,730)
Net loss per share, basic and diluted	$ (0.17)	$ (0.23)	$ (0.32)
Weighted-average number of common shares used in computing net loss per share, basic and diluted	89,505	84,157	82,807

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 Income And Comprehensive Income [Abstract]
Net loss	$ (15,077)	$ (19,479)	$ (26,730)
Other comprehensive income (loss):
Foreign currency translation adjustments	48	(1)	(746)
Comprehensive loss	$ (15,029)	$ (19,480)	$ (27,476)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Total	Service and Data Agreement	Common Stock	Common StockService and Data Agreement	Additional Paid-In Capital	Additional Paid-In CapitalService and Data Agreement	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Dec. 31, 2014	$ 276,888		$ 1		$ 531,018		$ (61,935)	$ (1)	$ (192,195)
Balance in shares at Dec. 31, 2014			81,380,014				4,844,906
Exercise of employee stock options	$ 4,081				4,081
Exercise of employee stock options, shares	1,232,184		1,232,184
Vesting of restricted stock units			2,006,143
Issuance of common stock, stock purchase plan	$ 1,599				1,599
Issuance of common stock, stock purchase plan, shares			193,495
Issuance of common stock, acquisition	1,544				1,544
Issuance of common stock, acquisition, shares			278,639
Stock-based compensation	32,346				32,346
Repurchases of common stock	(23,492)						$ (23,492)
Repurchases of common stock, Shares			(3,095,189)				3,095,189
Other comprehensive loss	(746)							(746)
Net loss	(26,730)								(26,730)
Balance at Dec. 31, 2015	265,490		$ 1		570,588		$ (85,427)	(747)	(218,925)
Balance in shares at Dec. 31, 2015			81,995,286				7,940,095
Exercise of employee stock options	$ 10,578				10,578
Exercise of employee stock options, shares	2,328,197		2,328,197
Vesting of restricted stock units			2,422,146
Issuance of common stock, stock purchase plan	$ 1,388				1,388
Issuance of common stock, stock purchase plan, shares			185,066
Issuance of common stock, acquisition	1,944				1,944
Issuance of common stock, acquisition, shares			337,327
Issuance of common stock related to agreement		$ 39,570				$ 39,570
Issuance of common stock related to agreement, shares				3,000,000
Stock-based compensation	28,286				28,286
Change in fair value of escrowed shares related to a services and data agreement	(4,880)				(4,880)
Repurchases of common stock	(11,147)						$ (11,147)
Repurchases of common stock, Shares			(1,707,613)				1,707,613
Other comprehensive loss	(1)							(1)
Net loss	(19,479)								(19,479)
Balance at Dec. 31, 2016	311,749		$ 1		647,474		$ (96,574)	(748)	(238,404)
Balance in shares at Dec. 31, 2016			88,560,409				9,647,708
Exercise of employee stock options	$ 6,200				6,200
Exercise of employee stock options, shares	1,435,484		1,435,484
Vesting of restricted stock units			1,750,137
Issuance of common stock, stock purchase plan	$ 2,563				2,563
Issuance of common stock, stock purchase plan, shares	825,848		275,761
Payments for taxes related to net sharesettlement of equity awards	$ (4,012)				(4,012)
Issuance of common stock, acquisition	12,957				12,957
Issuance of common stock, acquisition, shares			1,177,927
Cumulative-effect of accounting change					3,381				(3,381)
Conversion feature of convertible senior notes, net of issuance costs	49,090				49,090
Retirement of treasury stock					(66,151)		$ 96,574		(30,423)
Retirement of treasury stock, shares							(9,647,708)
Stock-based compensation	32,523				32,523
Change in fair value of escrowed shares related to a services and data agreement	2,000				2,000
Other comprehensive loss	48							48
Net loss	(15,077)								(15,077)
Balance at Dec. 31, 2017	$ 398,041		$ 1		$ 686,025			$ (700)	$ (287,285)
Balance in shares at Dec. 31, 2017			93,199,718

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (15,077,000)	$ (19,479,000)	$ (26,730,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	17,840,000	22,770,000	16,500,000
Stock-based compensation	32,252,000	28,286,000	32,346,000
Amortization of debt discount and issuance cost	1,148,000		134,000
Restructuring charge related to facility exit costs	2,074,000
Gain on sale of a right to use a web domain name			(4,800,000)
Loss on disposal of property and equipment	85,000	476,000	146,000
Allowance for doubtful accounts	(655,000)	652,000	680,000
Deferred income taxes	(702,000)	241,000	(561,000)
One-time charge for certain distribution fees		7,435,000
Change in fair value of escrowed shares and contingent consideration, net	5,515,000	(6,450,000)	1,231,000
Changes in operating assets and liabilities:
Accounts receivable	(4,382,000)	(9,358,000)	(12,792,000)
Prepaid expenses and other current assets	(2,553,000)	1,360,000	(1,231,000)
Accounts payable and other current liabilities	12,834,000	(1,718,000)	2,967,000
Accrued compensation and benefits	658,000	(1,914,000)	146,000
Deferred revenues	(580,000)	(486,000)	1,189,000
Other liabilities			6,000
Net cash provided by operating activities	48,457,000	21,815,000	9,231,000
Cash flows from investing activities:
Purchases of property and equipment	(6,475,000)	(6,281,000)	(13,170,000)
Purchases of intangible assets		(106,000)	(636,000)
Proceeds from sale of a right to use a web domain name			4,800,000
Acquisitions, net of cash acquired	(21,048,000)		(16,806,000)
Purchases of short-term investments	(114,239,000)	(88,172,000)	(25,000,000)
Proceeds from maturities of short-term investment	123,509,000	44,000,000
Net cash used in investing activities	(18,253,000)	(50,559,000)	(50,812,000)
Cash flows from financing activities:
Proceeds from borrowings on convertible senior notes, net of issuance costs	193,763,000
Proceeds from issuances of common stock under stock plans	8,763,000	11,966,000	5,680,000
Payments for taxes related to net share settlement of equity awards	(4,012,000)
Repayment of debt obligations			(7,500,000)
Repurchases of common stock		(11,944,000)	(22,695,000)
Principal payments on promissory note and capital lease obligations	(238,000)	(48,000)	(62,000)
Net cash provided by (used in) financing activities	198,276,000	(26,000)	(24,577,000)
Effect of exchange rates on cash and cash equivalents	(19,000)	(3,000)	30,000
Net increase (decrease) in cash and cash equivalents	228,461,000	(28,773,000)	(66,128,000)
Cash and cash equivalents at beginning of period	106,174,000	134,947,000	201,075,000
Cash and cash equivalents at end of period	334,635,000	106,174,000	134,947,000
Supplemental disclosures of cash flow information
Cash paid for income taxes	168,000	140,000	14,000
Cash paid for interest	29,000	3,000	196,000
Supplemental disclosures of noncash investing and financing activities
Fair value of common stock issued in connection with a services and data agreement		39,570,000
Computer equipment acquired under promissory note	819,000		797,000
Property and equipment acquired under capital leases	31,000	22,000
Fixed asset purchases not yet paid	973,000	1,324,000	1,365,000
Crisp Acquisition
Supplemental disclosures of noncash investing and financing activities
Issuance of shares related to Crisp acquisition	$ 12,957,000	$ 1,944,000	$ 1,544,000

Background

Background	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Background	1. Background Description of Business Quotient Technology Inc., is a provider of an industry leading digital marketing platform that drives sales by delivering personalized and targeted coupons and ads to shoppers at the right moment on their path to purchase. The Company has built a scaled network of consumer packaged goods (“CPG”) brands, retailers and shoppers, all digitally connected through our core platform, called Retailer iQ. Using proprietary and licensed data, including online behaviors, purchase intent, and retailers’ in-store point-of-sale (“POS”) shopper data, the Company targets shoppers with the most relevant digital coupons and ads, as well as measure campaign performance, including attribution of dollars spent on digital marketing to in-store sales. Customers and partners use the Company’s digital platform as a more effective channel to influence shoppers.

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 accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). The Company’s consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results may differ from the Company’s estimates, and such differences may be material to the accompanying consolidated financial statements. Cash, Cash Equivalents and Short-term Investments The Company considers all highly liquid investments with original maturities of three months or less at the time of purchase to be cash equivalents. The Company’s short-term investments consists of certificates of deposits with original maturities of greater than three months and remaining maturities less than one year as of the balance sheet date. Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recorded at invoiced amounts and do not bear interest. The Company generally does not require collateral and performs ongoing credit evaluations of its customers and maintains allowances for potential credit losses. The Company maintains an allowance for doubtful accounts based upon the expected collectability of its accounts receivable. The allowance is determined based upon specific account identification Property and Equipment, net Property and equipment, net, are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets, which are three years for computer equipment and software and five years for all other asset categories except leasehold improvements, which are amortized over the shorter of the lease term or the expected useful life of the improvements. Equipment leased under capital leases is amortized over the shorter of the lease term or the asset’s estimated useful life. Internal-Use Software Development Costs For costs incurred for computer software developed or obtained for internal use, the Company begins to capitalize its costs to develop software when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. These costs are amortized to cost of revenues over the estimated useful life of the related asset, generally estimated to be three years. Costs incurred prior to meeting these criteria together with costs incurred for training and maintenance are expensed as incurred and recorded in research and development expense on the Company’s consolidated statements of operations. Leases Leases meeting certain criteria are accounted for as capital leases. The imputed interest is included in interest expense in the accompanying consolidated statements of operations, and the capitalized value is amortized as part of the Company’s property and equipment, net. Obligations under capital leases are reduced by lease payments, net of imputed interest. All other leases are accounted for as operating leases. When an operating lease contains a predetermined fixed escalation of the minimum rent, or if tenant allowances have been received, the related rent expense is recognized on a straight-line basis over the term of the lease, with the difference between the recognized rent expense and amounts payable under the lease recorded as deferred rent liability. Business Combinations The Company accounts for acquisitions of entities that include inputs and processes and have the ability to create outputs as business combinations. Under the acquisition method of accounting, the total consideration is allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values at the acquisition dates. The excess of the consideration transferred over those fair values is recorded as goodwill. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Acquisition related costs are not considered part of the consideration, and are expensed as general and administrative expense as incurred. Contingent consideration, if any is measured at fair value initially on the acquisition date as well as subsequently at the end of each reporting period, typically based on the expected achievement of certain financial metrics, until, the assessment period is over and it gets finally settled. Goodwill and Intangible Assets Intangible assets with a finite life are amortized over their estimated useful lives. Goodwill is tested for impairment at least annually, and more frequently upon the occurrence of certain events that may indicate that the carrying value of goodwill may not be recoverable. The Company completes its annual impairment test during the fourth quarter of each year, Impairment of Long-Lived Assets Such assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured first by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, an impairment loss would be recognized for an amount by which the carrying amount of the asset exceeds the fair value of the asset. During the third quarter of 2016, the Company recorded a one-time charge associated with certain distribution fees under an arrangement with a retailer partner that were deemed unrecoverable. When the Company delivers a digital coupon on a retailer’s website or mobile app or through its loyalty program, or the website or mobile app of a publisher, or through its Retailer iQ platform, and the consumer takes certain actions, the Company pays a distribution fee to the retailer or other publisher, which, in some cases may be prepaid prior to being incurred. The Company considered various factors in its assessment including its historical experience with transaction volumes through the retailer and other comparative retailers, ongoing communications with the retailer to increase its marketing efforts to promote the digital platform, as well as the projected revenues, and associated revenue share payments. Accordingly, during the three months ended September 30, 2016, the Company recognized a one-time charge of $7.4 million related to such distribution fees in cost of revenues on the accompanying consolidated statement of operations. As of December 31, 2017, the Company had no prepaid non-refundable payments with our Retailer iQ partners. Fair Value of Financial Instruments The carrying values of the Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable, accrued compensation and benefits, and other current liabilities, approximate fair value due to their short-term nature. The Company records money market funds, short-term investments and contingent consideration at fair value. See Note 3 (Fair Value Measurements) Convertible Senior Notes In November 2017, the Company issued $200.0 million aggregate principal amount of 1.75% convertible senior notes due 2022 (the “notes”). In accounting for the issuance of the notes, the Company separated the notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the notes as a whole. This difference represents a debt discount that is amortized to interest expense over the terms of the notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the issuance costs related to the notes, the Company allocated the total amount incurred to the liability and equity components. Issuance costs attributable to the liability components are being amortized to expense over the contractual term of the notes, and issuance costs attributable to the equity component were netted with the equity component in additional paid-in capital. Revenue Recognition The Company derives revenues primarily from the set-up and activation of coupons and coupons codes, and digital media services. The Company recognizes revenue when all four of the following criteria are met: • Persuasive evidence of an arrangement exists; • Delivery has occurred or a service has been provided; • Customer fees are fixed or determinable; and • Collection is reasonably assured. Coupons. The Company generates revenues, as consumers select, activate, or redeem a coupon through our platform by either printing it for physical redemption at a retailer or saving it to a retailer loyalty account for automatic digital redemption. In the case of the setup fees, it recognizes revenues proportionally, on a per activation basis, using the number of authorized activations per insertion order, commencing on the date of the first coupon activation. For coupons, the pricing is generally determined on a per unit activation basis. Setup fees charged to customers represent charges for the creation of digital coupons and related activation, tracking and security features. Upfront insertion orders generally include a limit on the number of activations, or times consumers may select a coupon. Coupon Codes . The Company generally generates revenues when a consumer makes a purchase using a coupon code from its platform and completion of the order is reported to the Company. In the same period that the Company recognize revenues for the delivery of coupon codes, it also estimates and record a reserve, based upon historical experience, to provide for end-user cancelations or product returns which may not be reported until a subsequent date. Digital Media - The Company’s media services enable CPGs and retailers to deliver digital media to promote their brands and products on the Company’s websites and mobile apps, and through the Company’s affiliate publishers and non-publisher third parties. The Company charges a fee for these media campaigns, the pricing of which is based on the advertisement size and position. Related fees are generally billed monthly, based on a per-campaign, per-impression or per-click basis. The Company does not offer rights of refund of previously paid or delivered amounts, rebates, rights of return or price protection. In all instances, the Company limits the amount of revenue recognized to the amounts for which it have the right to bill its’ customers. Gross versus Net Revenue Reporting In the normal course of business and through its distribution network, the Company delivers digital coupons and media on retailers’ websites, through retailers’ loyalty programs, and on the websites of digital publishers. In these situations, the Company generally pays a distribution fee to the retailers or publishers which is included in the Company’s cost of revenues. The determination of whether revenues should be reported on a gross or net basis is based on an assessment of whether the Company is acting as the principal or an agent in the transaction. In determining whether the Company is the principal or an agent, the Company follows the accounting guidance for principal-agent considerations. Because the Company is the primary obligor and is responsible for (i) fulfilling the digital coupon and media delivery, (ii) establishing the selling prices for delivery of the digital coupons and media, and (iii) performing all billing and collection activities including retaining credit risk, the Company has concluded that it is the principal in these arrangements and therefore the Company reports revenues and cost of revenues on a gross basis. Multiple-element Arrangements For arrangements with multiple-deliverables, the Company determines whether each of the individual deliverables qualify as a separate unit of accounting. In order to treat deliverables in a multiple element arrangement as a separate unit of accounting, the deliverable must have standalone value upon delivery. The Company allocates the arrangement fee to all the deliverables (separate units of accounting) using the relative selling price method in accordance with the selling price hierarchy, which includes vendor-specific objective evidence (“VSOE”) if available, third-party evidence (“TPE”) if VSOE is not available and best estimate of selling price (“BESP”) if neither VSOE nor TPE is available. VSOE and TPE do not currently exist for any of the Company’s deliverables. Accordingly, for arrangements with multiple deliverables that can be separated into different units of accounting, the Company allocates the arrangement fee to the separate units of accounting based on BESP. The Company determines BESP for deliverables by considering multiple factors, including, but not limited to, prices it charges for similar offerings, market conditions, competitive landscape and pricing practices. The Company limits the amount of allocable arrangement consideration to amounts that are fixed or determinable and that are not contingent on future performance or future deliverables. Deferred Revenues Deferred revenues consist of coupon setup fees, activation fees, and digital media fees that are expected to be recognized upon coupon activations, or delivery of media impressions or clicks, which generally occurs within the next twelve months. Cost of Revenues Cost of revenues consist primarily of distribution fees, personnel costs and depreciation and amortization expense, software and acquired intangible assets incurred on revenue producing technologies, data center costs, third-party service fees including traffic acquisition costs and purchase of third party data. Distribution fees consist of payments to partners within the Company’s network for their digital coupon publishing services. Personnel costs include salaries, bonuses, stock-based awards and employee benefits. The personnel costs are primarily attributable to individuals maintaining the Company’s data centers and operations, which initiate, sets up and deliver digital coupon media campaigns. Depreciation and amortization expense includes depreciation of data center equipment and amortization of capitalized internal use software. Research and Development Expense The Company expenses the cost of research and development as incurred. Research and development expense consists primarily of personnel and related headcount costs and costs of professional services associated with the ongoing development of the Company’s technology. Stock-based Compensation The Company accounts for stock-based compensation using the fair value method, which requires the Company to measure the stock-based compensation based on the grant-date fair value of the awards and recognize the compensation expense over the requisite service period. The Company adopted ASU 2016-09 Stock Compensation Improvements to Employee Share-Based Payment Accounting Advertising Expense Advertising costs are expensed when incurred and are included in sales and marketing expense on the accompanying consolidated statements of operations. The Company incurred $1.0 million, $2.7 million and $1.4 million of advertising costs during the years ended December 31, 2017, 2016 and 2015, respectively. Advertising costs consist primarily of online marketing costs, such as sponsored search, advertising on social networking sites, e-mail marketing campaigns, loyalty programs, and affiliate programs. Income Taxes The Company accounts for income taxes in accordance with authoritative guidance, which requires the use of the liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the consolidated financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply to taxable income in the years in which the differences are expected to reverse. A valuation allowance is provided when it is more likely than not that the deferred tax assets will not be realized. The Company recognizes liabilities for uncertain tax positions based upon a two-step process. To the extent a tax position does not meet a more-likely-than-not level of certainty, no benefit is recognized in the consolidated financial statements. If a position meets the more-likely-than-not level of certainty, it is recognized in the consolidated financial statements at the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. The Company accounts for any applicable interest and penalties as a component of income tax expense. Foreign Currency Foreign currency denominated assets and liabilities of foreign subsidiaries, where the local currency is the functional currency, are translated into U.S. Dollars using the exchange rates in effect at the balance sheet dates, and income and expenses are translated using average exchange rates during the period. The resulting foreign currency translation adjustments are recorded in accumulated other comprehensive income (loss), a component of stockholders’ equity. Prior to the first quarter of 2016, the functional currency of each of the Company’s international subsidiaries was the local currency, as its international subsidiaries negotiated and managed business locally with minimal involvement from the U.S. parent entity. Beginning the first quarter of 2016, the functional currency of certain international subsidiaries changed from its local currency to U.S. Dollar (“USD”). The change in functional currency was the result of changes in the Company’s international strategy primarily resulting from the acquisition of Shopmium S.A. (a private company based in France). The Company acquired Shopmium S.A. as part of its strategy to broaden international operations and subsequently, the Company reviewed its international strategy, including management of its relationships with international CPG brands, evaluation of worldwide competition and international pricing strategy, its plan to manage future billings and collections for international customers and plan to further develop the acquired technology for its subsequent use by various entities. Consequently, as part of the Company’s new international strategy and changes to the way the Company runs its business internationally, it modified its existing international structure and entered into various inter-company licensing agreements between its U.S. entity and certain international entities. As these changes were significant, the Company considered the economic factors outlined in ASC 830, Foreign Currency Matters, The change in functional currency is applied on a prospective basis beginning with our first quarter of 2016 and translation adjustments for prior periods will continue to remain as a component of accumulated other comprehensive loss. Gains and losses from foreign currency transactions are included in other income (expense), net in the accompanying consolidated statements of operations. Foreign currency transaction gains (losses) were immaterial for all the periods presented in the accompanying consolidated financial statements. Other Comprehensive Income (Loss) Other comprehensive income (loss) consists of foreign currency translation adjustments. Net Income (Loss) per Share The Company’s basic net income (loss) per share attributable to common stockholders is computed by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding during the period. The diluted net income (loss) per share is computed by giving effect to all potentially dilutive common share equivalents outstanding during the period. The dilutive effect of dilutive common share equivalents is reflected in diluted net income (loss) per share by application of the treasury stock method. Since the Company intends to settle the principal amount of its outstanding convertible senior notes in cash, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The effects of options to purchase common stock, RSUs, certain shares held in escrow, and convertible senior notes are excluded from the computation of diluted net loss per share attributable to common stockholders because their effect is antidilutive. Segments The Company’s chief operating decision maker, who is the Chief Executive Officer, reviews the Company’s financial information presented on a consolidated basis for purposes of allocating resources and evaluating our financial performance. There are no segment managers who are held accountable by the chief operating decision maker, or anyone else, for operations, operating results, and planning for levels or components below the consolidated unit level. Accordingly, the Company has determined that it operates in one single reporting segment. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents, short-term investments and accounts receivable. For cash, cash equivalents and short-term investments, the Company is exposed to credit risk in the event of default by the financial institutions to the extent of the amounts recorded on the accompanying consolidated balance sheets. Credit risk with respect to accounts receivable is dispersed due to the large number of customers. The Company does not require collateral for accounts receivable. Recently Issued Accounting Pronouncements Accounting Pronouncements Not Yet Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). Early adoption is permitted, but not before the original effective date of the amendment, which was the first quarter of 2017. The Company has completed its evaluation of the overall impact of the new standard on its accounting policies, processes, system requirements, and internal controls over financial reporting. In addition to internal resources, the Company engaged third-party service providers to assist with the evaluation. The Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new standard. The Company will adopt the new revenue standard in the first quarter of 2018 using the modified retrospective method, and does not expect a material impact on the amount and timing of revenue recognized in its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows Classification of Certain Cash Receipts and Cash Payments Accounting Pronouncements Adopted In March 2016, the FASB issued ASU 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements The fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: Level 1—Quoted prices in active markets for identical assets or liabilities. Level 2—Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for similar assets or liabilities in active or inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3—Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability. Assets and Liabilities Measured at Fair Value on a Recurring Basis The Company’s fair value hierarchy for its financial assets and liabilities that are measured at fair value on a recurring basis are as follows (in thousands): December 31, 2017 Level 1 Level 2 Level 3 Total Assets: Money market funds ( 2) 100,152 — — 100,152 Certificate of deposits (3) — 59,902 — 59,902 Total $ 100,152 $ 59,902 $ — $ 160,054 Liabilities: Contingent consideration related to Crisp acquisition (1) — — 18,500 18,500 Contingent consideration related to Shopmium acquisition (4) — — — — Total $ — $ — $ 18,500 $ 18,500 December 31, 2016 Level 1 Level 2 Level 3 Total Assets: Certificate of deposits (3) — 69,172 — 69,172 Total $ — $ 69,172 $ — $ 69,172 Liabilities: Contingent consideration related to Shopmium acquisition (4) — — 185 185 Total $ — $ — $ 185 $ 185 (1) Included in contingent consideration related to acquisitions (2) Included in cash and cash equivalents (3) Included in short-term investments (4) Included in other non-current liabilities The valuation technique used to measure the fair value of money market funds included using quoted prices in active markets. The money market funds have a fixed net asset value (NAV) of $1. The valuation technique to measure the fair value of certificate of deposits included using quoted prices in active markets for similar assets. The fair value of contingent consideration related to the acquisition of Crisp Media, Inc. (“Crisp”) was estimated using an option pricing method and was based on significant inputs not observable in the market, thus classified as a Level 3 instrument. The inputs include expected achievement of certain financial metrics over the contingent consideration period, historical volatility and discount rate. Refer to Note 6 for further details related to the acquisition. The fair value of contingent consideration related to the acquisition of Shopmium S.A. (“Shopmium”) was estimated using a Monte Carlo simulation and was based on significant inputs not observable in the market, thus classified as a Level 3 instrument. The inputs include the expected achievement of certain revenue and profit milestones for the years ending December 31, 2016 and 2017, historical volatility and risk-free interest rate. The following table represents the change in the contingent consideration (in thousands): Shopmium Crisp Level 3 Level 3 Balance as of December 31, 2016 $ 185 $ — Addition related to Crisp acquisition — 14,800 Change in fair value (185 ) 3,700 Balance as of December 31, 2017 $ — $ 18,500 For the year ended December 31, 2017, the Company recorded a loss of million due to the changes in fair value of contingent consideration. The change in fair value of Crisp contingent consideration is due to an increase in expected achievement of certain financial metrics over the contingent consideration period. The change in fair value of Shopmium contingent consideration is due to it not meeting its revenue and profit milestones for the years ending December 31, 2016 and 2017. Accordingly, the Company has determined that there is no payout related to the Shopmium contingent consideration. The changes in the fair value of the contingent consideration are included as a component of operations in the accompanying consolidated statements of operations. There were no transfers between fair value hierarchies during the year ended December 31, 2017. Fair Value Measurements of Other Financial Instruments As of December 31, 2017, the fair value of the 1.75% convertible senior notes due 2022 was $196.3 million. The fair value was determined based on a quoted price of the convertible senior notes in an over-the-counter market on the last trading day of the reporting period. Accordingly, these convertible senior notes are classified within Level 2 in the fair value hierarchy. Refer to Note 8 for additional information related to the Company’s convertible debt.

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Allowance for Doubtful Accounts	4. Allowance for Doubtful Accounts The summary of activities in the allowance for doubtful accounts is as follows (in thousands): Year Ended December 31, 2017 2016 2015 Balance at beginning of period $ 1,338 $ 833 $ 408 Additions related to Crisp acquisition 229 — — Bad debt expense (recovery) (655 ) 652 680 Write-offs, net (126 ) (147 ) (255 ) Balance at end of period $ 786 $ 1,338 $ 833

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	5. Balance Sheet Components Property and Equipment, Net Property and equipment consist of the following (in thousands): December 31, 2017 2016 Software $ 33,198 $ 32,286 Computer equipment 24,342 22,664 Leasehold improvements 7,905 8,141 Furniture and fixtures 2,107 2,296 Total 67,552 65,387 Accumulated depreciation and amortization (55,752 ) (50,249 ) Projects in process 4,810 1,238 Property and equipment, net $ 16,610 $ 16,376 Depreciation and amortization expense of property and equipment was $6.9 million, $16.0 million and $13.1 million for the years ended December 31, 2017, 2016 and 2015, respectively. During the years ended December 31, 2017, 2016 and 2015, the Company disposed of equipment with an original cost of $1.5 million, $5.4 million and $2.9 million, resulting in a loss on disposal of $85,000, $476,000 During the years ended December 31, 2017, 2016 and 2015, the Company capitalized $3.8 million, $0.7 million, and $1.5 million, respectively, of development costs related to internal software. The Company recognized $0.6 million, $10.5 million and $9.4 million of amortization expense related to internal use software, included in property and equipment depreciation and amortization expense above, and recorded as cost of revenues during the year ended December 31, 2017, 2016 and 2015 respectively. The unamortized capitalized development and enhancement costs related to internal software were $4.4 million and $1.2 million as of December 31, 2017 and 2016, respectively. Accrued Compensation and Benefits Accrued compensation and benefits consist of the following (in thousands): December 31, 2017 2016 Bonus $ 7,212 $ 5,985 Commissions 4,199 3,572 Vacation 371 1,916 Payroll and related expenses 2,132 1,729 Accrued compensation and benefits $ 13,914 $ 13,202 Other Current Liabilities Other current liabilities consist of the following (in thousands): December 31, 2017 2016 Distribution fees $ 18,485 $ 12,463 Marketing expenses 2,826 3,383 Prefunded Liability 2,151 1,345 Traffic Acquisition Cost 3,040 — Other 9,036 3,673 Other current liabilities $ 35,538 $ 20,864

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	6. Acquisitions On May 31, 2017, the Company acquired all the outstanding shares of Crisp Media, Inc. (“Crisp”), a mobile marketing and advertising company, delivering shopper marketing media campaigns for consumer packaged goods brands (CPGs) and retailers. Crisp’s mobile media expertise complements Quotient’s proprietary shopper data, retail network and existing promotions and media offerings. The total preliminary acquisition consideration of $51.9 million consisted of $24.1 million in cash, 1,177,927 shares of the Company’s common stock with a fair value of $13.0 million or $11.00 per share, and contingent consideration of up to $24.5 million payable in cash with a fair value of $14.8 million, as of the acquisition date. The contingent consideration payout is based on Crisp achieving certain financial metrics over a period of one year after closing and is payable within 105 days after May 31, 2018. At the date of acquisition, the contingent consideration’s fair value of $14.8 million was determined by using an option pricing method. Refer to Footnote 3 for fair value of contingent consideration at December 31, 2017. On October 30, 2015, the Company acquired all the outstanding shares of Shopmium S.A. (“Shopmium”), a company based in France, and creator of a mobile app for receipt-scanning and cash-back. The total acquisition consideration of $19.5 million consisted of $16.5 million in cash, 278,639 shares of the Company’s common stock with a fair value of $1.5 million or $5.54 per share, and contingent consideration of up to $4.8 million payable in cash with a fair value of $1.5 million. The contingent consideration payout is based on Shopmium achieving certain revenue and profit milestones for the years ended December 31, 2016 and 2017. At the date of acquisition, the contingent consideration’s fair value of $1.5 million was determined using a Monte Carlo simulation. The acquisitions provide the Company with customer and vendor relationships, developed technologies, domain names, patents, registered users, trade names and backlog. The fair values of identifiable intangible assets were determined using discounted cash flow models. The fair values of developed technologies and trade names intangible assets were determined by using the relief from royalty methods. The excess of the consideration paid over the fair value of the net tangible assets and identifiable intangible assets acquired is recorded as goodwill. The goodwill is attributable to expected synergies from combined operations and the acquired companies’ knowhow. Assets acquired and liabilities assumed were recorded at their fair values as of the respective acquisition dates. The following table summarizes the consideration paid for each acquisition and the related fair values of the assets acquired and liabilities assumed (in thousands): Purchase Consideration Net Tangible Assets Acquired/ (Liabilities Assumed) Identifiable Intangible Assets Goodwill Goodwill Deductible for Taxes Acquisition Related Expenses (1) Crisp $ 51,904 $ 5,893 $ 9,400 $ 36,611 Not $ 1,504 Shopmium 19,461 (1,383 ) 5,803 15,041 Not 333 $ 71,365 $ 4,510 $ 15,203 $ 51,652 $ 1,837 (1) Expensed as general and administrative The following table sets forth each component of identifiable intangible assets acquired in connection with the acquisitions: (in thousands): Crisp Shopmium Total Estimated Useful Life (in Years) Developed technologies $ 5,000 $ 3,343 $ 8,343 4 - 5 Customer relationships 2,800 1,696 4,496 5 - 7 Domain names — 344 344 5 Trade names 1,600 — 1,600 4 Vendor relationships — — — 4 Registered users — 420 420 4 Patents — — — 5 Total identifiable intangible assets $ 9,400 $ 5,803 $ 15,203 The financial results of the acquired companies are included in the Company’s consolidated statements of operations from their respective acquisition dates and were insignificant to the Company’s operating results. The pro forma impact of these acquisitions on consolidated revenues, income (loss) from operations and net loss was not material.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	7. Goodwill and Intangible Assets Goodwill represents the excess of the consideration paid over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. The changes in the carrying value of goodwill are as follows (in thousands): Goodwill Balance as of December 31, 2016 $ 43,895 Acquisition of Crisp 36,611 Balance as of December 31, 2017 $ 80,506 On August 3, 2016, the Company entered into a services and data agreement, (the “Agreement”), which provides the Company with certain exclusive rights to provide promotion and media services, and the use of shopper data, for 5.5 years, with certain rights continuing on a non-exclusive basis for up to an additional 4.5 years. In exchange, the Company agreed to issue 3,000,000 shares of common stock. The consideration for such services and data rights aggregated to $39.6 million based on the fair value of 3,000,000 shares of the Company’s common stock at the date of entering into the Agreement. Out of the 3,000,000 shares issued, 1,000,000 shares were issued within five business days of execution of the Agreement and 2,000,000 shares are held in escrow and will be released in two equal installments, within 15 business days following the years ending December 31, 2017 and 2018. The fair value of the shares held in escrow was recorded in additional paid in capital and is subject to re-measurement until released from escrow. During the years ended December 31, 2017 and 2016, the Company recorded a loss of $2.0 million and a gain of $4.9 million, respectively, due to the change in the Company’s stock price. Gains and losses as a result of the changes in the fair value of the shares that are being held in escrow are included in change in fair value of escrowed shares and contingent consideration, net on the accompanying consolidated statement of operations. As of December 31, 2017, the contingencies for the release of the first installment of 1,000,000 shares held in escrow have been met. Subsequent to December 31, 2017, a total of 1,000,000 shares were released from escrow. The consideration of $39.6 million as well as the capitalized transaction costs of $0.1 million were allocated to the acquired intangible assets based on the respective fair values. The Company is amortizing the intangible assets on a straight-line basis over their respective estimated useful lives in cost of revenues on the accompanying consolidated statement of operations. Intangible assets consist of the following (in thousands): December 31, 2017 Gross Accumulated Amortization Net Weighted Average Amortization Period (Years) Promotion service rights $ 22,492 $ (4,252 ) $ 18,240 6.1 Developed technologies 12,187 (5,013 ) 7,174 3.0 Customer relationships 11,660 (6,547 ) 5,113 4.3 Data access rights 10,801 (2,666 ) 8,135 4.3 Media service rights 6,383 (1,575 ) 4,808 4.3 Domain names 5,949 (4,689 ) 1,260 1.3 Trade names 1,767 (401 ) 1,366 3.4 Patents 975 (769 ) 206 4.5 Vendor relationships 890 (890 ) — — Registered users 420 (232 ) 188 2.2 $ 73,524 $ (27,034 ) $ 46,490 4.7 As of December 31, 2017 and 2016, the Company has a domain name with a gross value of $0.4 million with an indefinite useful life that is not subject to amortization. December 31, 2016 Gross Accumulated Amortization Net Weighted Average Amortization Period (Years) Promotion service rights $ 22,492 $ (1,256 ) $ 21,236 7.1 Data access rights 10,801 (787 ) 10,014 5.3 Customer relationships 8,860 (4,951 ) 3,909 3.1 Developed technologies 7,187 (2,926 ) 4,261 3.3 Media service rights 6,383 (465 ) 5,918 5.3 Domain names 5,948 (4,070 ) 1,878 2.2 Patents 975 (718 ) 257 5.6 Vendor relationships 890 (667 ) 223 1.0 Registered users 420 (129 ) 291 3.3 Trade names 167 (167 ) — — $ 64,123 $ (16,136 ) $ 47,987 5.6 Amortization expense related to intangible assets subject to amortization was $10.9 million, $6.8 million and $3.4 million for the years ended December 31, 2017, 2016 and 2015, respectively. Estimated amortization expense related to intangible assets is as follows (in thousands): Total 2018 $ 11,467 2019 10,378 2020 8,962 2021 7,104 2022 4,408 Thereafter 3,818 Total estimated amortization expense $ 46,137

Debt Obligations

Debt Obligations	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt Obligations	8. Debt Obligations 2017 Convertible Senior Notes In November 2017, the Company issued $200.0 million aggregate principal amount of 1.75% convertible senior notes due 2022 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended, (the “notes”). The notes are unsecured obligations of the Company and bear interest at a fixed rate of 1.75% per annum, payable semi-annually in arrears on June 1 and December 1 of each year, commencing on June 1, 2018. The total net proceeds from the debt offering, after deducting transaction costs, were approximately $193.8 million. The conversion rate for the notes will initially be 57.6037 shares of the Company’s common stock per $1,000 principal amount of notes, which is equivalent to an initial conversion price of approximately $17.36 per share of common stock, subject to adjustment upon the occurrence of specified events. Holders of the notes may convert their notes at their option at any time prior to the close of business on the business day immediately preceding September 1, 2022, only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on March 31, 2018 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five-business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate for the notes on each such trading day; (3) if the Company calls any or all of the notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events. On or after September 1, 2022, holders may convert all or any portion of their notes at any time prior to the close of business on the scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of its common stock or a combination of cash and shares of its common stock, at its election. The Company intends to settle the principal amount of the notes with cash. The Company may not redeem the notes prior to December 5, 2020. It may redeem for cash all or any portion of the notes, at its option, on or after December 5, 2020 if the last reported sale price of its common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending not more than three trading days preceding the date on which it provides notice of redemption at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the notes. If the Company undergoes a fundamental change prior to the maturity date, holders may require the Company to repurchase for cash all or any portion of their notes at a fundamental change repurchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In accounting for the issuance of the notes, the Company separated the notes into liability and equity components. The carrying amount of the liability component of $149.3 million was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component of $50.7 million, representing the conversion option, was determined by deducting the fair value of the liability component from the par value of the notes. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense over the term of the notes at an effective interest rate of 5.8%. The Company allocated the total debt issuance costs incurred of $6.2 million to the liability and equity components of the notes in proportion to the respective values. Issuance costs attributable to the liability component of $4.6 million are being amortized to interest expense using the effective interest method over the contractual terms of the notes. Issuance costs attributable to the equity component of $1.6 million were netted with the equity component in additional paid-in capital. The net carrying amount of the liability component of the notes recorded in convertible senior notes, net on the consolidated balance sheets was as follows (in thousands): December 31, 2017 Principal $ 200,000 Unamortized debt discount (49,631 ) Unamortized debt issuance costs (4,548 ) Net carrying amount of the liability component $ 145,821 The net carrying amount of the equity component of the notes recorded in additional paid-in capital on the consolidated balance sheets was as follows (in thousands): December 31, 2017 Debt discount related to value of conversion option $ 50,670 Debt Issuance costs (1,580 ) Net carrying amount of the equity component $ 49,090 The following table sets forth the interest expense related to the notes recognized in interest expense on the consolidated statements of operations (in thousands): Year Ended December 31, 2017 Contractual interest expense $ 406 Amortization of debt discount 1,039 Amortization of debt issuance costs 109 Total interest expense related to the Notes $ 1,554

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	9. Stock-based Compensation 2013 Equity Incentive Plan In October 2013, the Company adopted the 2013 Equity Incentive Plan (the “2013 Plan”), which became effective in March 2014 and serves as the successor to the Company’s 2006 Stock Plan (the “2006 Plan”). Pursuant to the 2013 Plan, 4,000,000 shares of common stock were initially reserved for grant, plus (1) any shares that were reserved and available for issuance under the 2006 Plan at the time the 2013 Plan became effective, and (2) any shares that become available upon forfeiture or repurchase by the Company under the 2006 Plan and 2000 Plan. Under the 2013 Plan, the Company may grant stock options, stock appreciation rights, restricted stock and restricted stock units, performance shares and units to employees, directors and consultants. The shares available will be increased at the beginning of each year by lesser of (i) 4% of outstanding common stock on the last day of the immediately preceding year, or (ii) such number determined by the Board of Directors. Under the 2013 Plan, both the ISOs and NSOs are granted at a price per share not less than 100% of the fair market value on the effective date of the grant. The Board of Directors determines the vesting period for each option award on the grant date, and the options generally expire 10 years from the grant date or such shorter term as may be determined by the Board of Directors. Stock Options The fair value of each option was estimated using Black-Scholes model on the date of grant for the periods presented using the following assumptions: Year Ended December 31, 2017 2016 2015 Expected life (in years) 5.50 - 6.25 2.30 - 6.08 5.50 - 6.08 Risk-free interest rate 1.87% - 2.14% 0.68% - 1.34% 1.67% - 1.89% Volatility 50 % 55% - 70% 55% - 60% Dividend yield — — — The weighted-average grant-date fair value of options granted was $6.33, $5.14 and $5.50 per share during the years ended December 31, 2017, 2016 and 2015, respectively. Restricted Stock Units and Performance-Based Restricted Stock Units The fair value of RSUs equals the market value of the Company’s common stock on the date of grant. The RSUs are excluded from issued and outstanding shares until they are vested. On September 28, 2017 (the “Grant Date”), the Company granted 128,205 performance-based RSUs (“PSU Award”), under the 2013 Equity Incentive Plan, to Mir Aamir, in connection with his promotion to President and Chief Executive Officer. The original PSU Award represented the right to receive shares of the Company’s common stock upon meeting certain vesting conditions which were tied to achievement of certain Company stock price goals. The terms of the original PSU Award were subsequently modified to provide incentives based on targets directly tied to the Company’s performance. The fair value of the original PSU Award of $1.6 million was measured using a Monte Carlo simulation and will be recognized over the requisite service period. The incremental fair value of the modified award of $0.4 million was derived from the excess fair value of the modified PSU award, based on the Company’s stock price as of the modification date, over the fair value of the original PSU award, and will be recognized if the achievement of the performance condition is considered probable over the requisite service period. During the year ended December 31, 2017, the Company recognized $0.2 million stock-based compensation expense in the consolidated financial statements related to the PSU Award. A summary of the Company’s stock option and RSUs award activity under the Plans is as follows: Options Outstanding RSUs Outstanding Shares Available for Grant Number Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Number of Shares Weighted Average Grant Date Fair Value Balance as of December 31, 2014 1,825,112 9,494,763 $ 7.00 6.57 $ 107,913 6,809,415 $ 12.66 Increase in shares authorized 3,255,200 — — — — — — Options granted (328,680 ) 328,680 10.05 — — — — Options exercised — (1,232,184 ) 3.31 — 10,246 — — Options canceled or expired 121,593 (121,593 ) 9.35 — — — — RSUs granted (3,673,053 ) — — — — 3,673,053 12.43 RSUs released — — — — — (2,006,893 ) 11.64 RSUs canceled or expired 1,689,129 — — — — (1,689,129 ) 12.80 Balance as of December 31, 2015 2,889,301 8,469,666 $ 7.62 5.91 $ 19,231 6,786,446 $ 13.14 Increase in shares authorized 3,279,811 — — — — — — Options granted (2,197,432 ) 2,197,432 8.99 — — — — Options exercised — (2,328,197 ) 4.54 — 15,485 — — Options canceled or expired 592,834 (592,834 ) 8.97 — — — — RSUs granted (2,855,267 ) — — — — 2,855,267 10.37 RSUs released — — — — — (2,422,146 ) 11.92 RSUs canceled or expired 1,715,483 — — — — (1,715,483 ) 11.81 Balance as of December 31, 2016 3,424,730 7,746,067 $ 8.83 6.12 $ 30,507 5,504,084 $ 12.02 Increase in shares authorized 3,542,416 — — — — — — Options granted (1,319,680 ) 1,319,680 $ 12.76 — — — — Options exercised — (1,435,484 ) $ 4.32 — $ 10,768 — — Options canceled or expired 218,035 (218,035 ) $ 10.34 — — — — RSUs and PSUs granted (2,517,721 ) — — — — 2,517,721 $ 12.04 RSUs released — — — — — (2,040,504 ) $ 12.20 RSUs canceled or expired 787,009 — — — — (787,009 ) $ 11.47 RSUs withheld for taxes 290,366 — — — — — — Balance as of December 31, 2017 4,425,155 7,412,228 $ 10.36 6.09 $ 25,415 5,194,292 $ 12.26 Vested and exercisable as of December 31, 2017 5,345,298 $ 10.02 5.08 $ 22,891 The aggregate intrinsic value disclosed in the table above is based on the difference between the exercise price of the options and the fair value of the Company’s common stock. The aggregate total fair value of shares vested during the years ended December 31, 2017, 2016 and 2015 was $6.6 million, $3.7 million and $3.8 million, respectively. Additional information for options outstanding and exercisable as of December 31, 2017 is as follows: Options Outstanding Options Exercisable Weighted Weighted Weighted Remaining Average Average Number of Contractual Exercise Number of Exercise Exercise Prices Shares (Years) Price Shares Price $0.15 - $5.33 1,810,210 2.69 $ 2.47 1,810,210 $ 2.47 $5.48 - $8.51 1,554,928 7.97 8.31 793,126 8.13 $8.65 - $13.00 2,392,355 7.43 10.94 1,224,054 9.17 $13.04 - $16.25 854,735 6.37 15.46 717,908 15.88 $ 25.00 800,000 5.87 $ 25.00 800,000 $ 25.00 7,412,228 5,345,298 Employee Stock Purchase Plan The Company’s Board of Directors adopted the 2013 Employee Stock Purchase Plan (“ESPP”), which became effective in March 2014, pursuant to which 1,200,000 shares of common stock were reserved for future issuance. In addition, ESPP provides for annual increases in the number of shares available for issuance on the first day of each year equal to the least of (i) 0.5% of the outstanding shares of common stock on the last day of the immediately preceding year, (ii) 400,000 shares or (iii) such other amount as may be determined by the Board of Directors. Eligible employees can enroll and elect to contribute up to 15% of their base compensation through payroll withholdings in each offering period, subject to certain limitations. Each offering period is six months in duration. The purchase price of the stock is the lower of 85% of the fair market value on (a) the first day of the offering period or (b) the purchase date. The fair value of the option feature is estimated using the Black-Scholes model for the period presented based on the following assumptions: Year Ended December 31, 2017 2016 2015 Expected life (in years) 0.50 0.50 0.50 Risk-free interest rate 0.62% - 1.42% 0.38% - 0.62% 0.08% - 0.33% Volatility 40% - 50% 50% - 74% 63% - 72% Dividend yield — — — During the year ended December 31, 2017, a total of 825,848 shares of common stock were issued under the 2013 Employee Stock Purchase Plan (“ESPP”), since inception of the plan. As of December 31, 2017, a total of 1,574,152 shares are available for issuance under the ESPP. Stock-based Compensation Expense The following table sets forth the total stock-based compensation expense resulting from stock options, RSUs, and ESPP included in the Company’s consolidated statements of operations (in thousands): Year Ended December 31, 2017 2016 2015 Cost of revenues $ 2,000 $ 1,821 $ 1,728 Sales and marketing 6,621 5,776 10,658 Research and development 7,949 7,286 9,680 General and administrative 15,682 13,403 10,280 Total stock-based compensation expense $ 32,252 $ 28,286 $ 32,346 During 2016, the Company recorded $1.0 million of stock-based compensation expense on account of modification of stock options and RSUs granted to a former employee pursuant to transitioning from an employee to a special advisor consulting arrangement. Under the original terms of the grant agreements, the unvested options and RSUs would be forfeited upon termination. The transition arrangement extended the period over which the vested awards can be exercised and allows for continued vesting of unvested options and RSUs subject to the former employee continuing to provide services in accordance with the special advisor consulting arrangement. The expense is included in general and administrative expense in the Company’s consolidated statement of operations. As of December 31, 2017, there was $56.0 million unrecognized stock-based compensation expense of which $11.1 million is related to stock options and ESPP and $44.9 million is related to RSUs and PSUs. The total unrecognized stock-based compensation expense related to stock options and ESPP as of December 31, 2017 will be amortized over a weighted-average period of 2.5 years. The total unrecognized stock-based compensation expense related to RSUs as of December 31, 2017 will be amortized over a weighted-average period of 2.5 years. The Company capitalized stock-based compensation cost of $0.3 million in projects in process as part of property and equipment, net on the accompanying consolidated balance sheets during the year ended December 31, 2017.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2017
Stockholders Equity Note [Abstract]
Stockholders' Equity	10. Stockholders’ Equity Amended and Restated Certificate of Incorporation In March 2014, the Company filed an amended and restated certificate of incorporation, which became effective immediately following the completion of the Company’s IPO. Under the restated certificate of incorporation, the authorized capital stock consists of 250,000,000 shares of common stock and 10,000,000 shares of preferred stock. Common Stock . The rights, preferences and privileges of the holders of common stock are subject to the rights of the holders of shares of any series of preferred stock which the Company may issue in the future. Subject to the foregoing, for as long as such stock is outstanding, the holders of common stock are entitled to receive ratably any dividends as may be declared by the Board of Directors out of funds legally available for dividends. Holders of common stock are entitled to one vote per share on any matter to be voted upon by stockholders. The amended and restated certificate of incorporation establishes a classified Board of Directors that is divided into three classes with staggered three year terms. Only the directors in one class will be subject to election at each annual meeting of stockholders, with the directors in other classes continuing for the remainder of their three year terms. Upon liquidation, dissolution or winding-up, the assets legally available for distribution to the Company’s stockholders would be distributable ratably among the holders of common stock and any participating preferred stock outstanding at that time, subject to prior satisfaction of all outstanding debt and liabilities and the preferential rights of and the payment of liquidation preferences, if any, on any outstanding shares of preferred stock. Preferred Stock . The Board of Directors is authorized to issue undesignated preferred stock in one or more series without stockholder approval and to determine for each such series of preferred stock the voting powers, designations, preferences, and special rights, qualifications, limitations, or restrictions as permitted by law, in each case without further vote of action by the stockholders. The Board of Directors can also increase or decrease the number of shares of any series of preferred stock, but not below the number of shares of that series then outstanding, without any further vote or action by the stockholders. The Board of Directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of common stock. Amendment . The amendment of the provisions in the restated certificate requires approval by holders of at least 66 2/3% of the Company’s outstanding capital stock entitled to vote generally in the election of directors. Common Stock Repurchases The Board of Directors has approved programs for the Company to repurchase shares of its common stock. In April 2017, the Board of Directors authorized a share repurchase program (“2017 Program”) for the Company to repurchase up to $50.0 million of its common stock. The 2017 Program has a one year duration beginning on May 5, 2017. Stock repurchases may be made from time-to-time and the timing of any repurchases and the actual number of shares repurchased will depend on a variety of factors. The Company may suspend, modify or terminate this repurchase program at any time without prior notice. During the year ended December 31, 2017, the Company did not repurchase any shares of its common stock. D uring the year ended December 31, 2016, 3,095,189 shares of its common stock at an aggregate cost of $23.5 million. During the fourth quarter of 2017, the Company retired 9,647,708 shares of its treasury stock upon authorization of its Board of Directors.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes The components of the Company’s loss before provision for (benefit from) income taxes were as follows (in thousands): Year Ended December 31, 2017 2016 2015 Domestic $ 12,770 $ 18,041 $ 25,385 Foreign 3,009 1,197 1,906 Total $ 15,779 $ 19,238 $ 27,291 The components of the provision for (benefit from) income taxes are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Current: Federal $ — $ 43 $ — State 4 8 2 Foreign 173 84 91 Total current income tax expense (benefit) 177 135 93 Deferred: Federal (673 ) 142 (317 ) State 84 14 (23 ) Foreign (290 ) (50 ) (314 ) Total deferred income tax expense (benefit) (879 ) 106 (654 ) Total $ (702 ) $ 241 $ (561 ) A reconciliation of the federal statutory income tax rate to the Company’s effective tax rate is as follows: Year Ended December 31, 2017 2016 2015 Federal tax (34.00 %) (34.00 %) (34.00 %) State income tax, net of federal tax benefit 0.56 % 0.11 % (0.08 %) Tax credits (8.29 %) (8.14 %) (4.60 %) Stock-based compensation (0.54 %) 1.52 % 0.67 % Foreign income taxes at other than U.S. rates 5.74 % 2.29 % 1.56 % Acquisition related costs 1.66 % — 0.76 % Contingent consideration related to acquisitions 12.28 % (9.04 %) — Other 2.93 % 2.77 % 0.41 % IRS Settlement — (12.42 %) — Tax Cuts and Jobs Act 175.93 % — — Valuation allowance, net (160.72 %) 58.16 % 33.22 % Effective tax rate (4.45 %) 1.25 % (2.06 %) On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a federal corporate tax rate decrease from 35% to 21%, effective for tax years beginning after December 31, 2017, the transition of U.S. international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings. The Company has calculated its best estimate of the impact of the Act in our year end income tax provision in accordance with its understanding of the Act and guidance available as of the date of this filing and as a result have recorded $0.7 million as an income tax benefit in the fourth quarter of 2017, the period in which the legislation was enacted. The provisional amount related to the re-measurement of certain deferred tax assets and liabilities, based on the rates at which they are expected to reverse in the future, was $27.7 million, with a corresponding provisional valuation allowance of $28.4 million, resulting in a provisional income tax benefit of $0.7 million attributable to the re-measurement of certain indefinite lived deferred tax liabilities related to tax deductible goodwill. The provisional amount related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings was immaterial based on cumulative foreign deficits from our foreign subsidiaries. The Act subjects a U.S. shareholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income On December 22, 2017, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. In accordance with SAB 118, the Company has determined that the $27.7 million recorded in connection with the re-measurement of certain deferred tax assets and liabilities, and corresponding valuation allowance of $28.4 million, was a provisional amount and a reasonable estimate at December 31, 2017. Additional work is necessary for a more detailed analysis of its deferred tax assets and liabilities. Any subsequent adjustment to these amounts may be recorded to current tax expense in the quarter of 2018 when the analysis is complete. The Company recorded a benefit from income taxes of $0.7 million for the year ended December 31, 2017, a provision for income taxes of $0.2 million for the year ended December 31, 2016, and benefit from income taxes of $0.6 million for the year ended December 31, 2015. The benefit for income taxes for the year ended December 31, 2017 was primarily attributable to the provisional impact of the re-measurement of certain indefinite lived deferred tax liabilities related to tax deductible goodwill as a result of the Act. The provision for income taxes for the year ended December 31, 2016 was primarily attributable to an increase in deferred tax liabilities associated with the change in fair value of contingent consideration from prior year acquisitions and a decrease in foreign income taxed at non-US tax rates. The benefit from income taxes for the year ended December 31, 2015 was primarily attributable to a decrease in deferred tax liabilities that arose from a gain the Company recorded from the change in the fair value of contingent consideration from prior year acquisitions and net foreign tax benefit, partially offset by state income taxes. Based on the Company’s provisional analysis, the one-time transition tax is expected to be immaterial. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations. As a result of meeting certain employment and capital investment actions under Section 10AA of the India Income Tax Act, the Company’s India subsidiary is wholly exempt from income tax for tax years beginning April 1, 2014 through March 31, 2019 and partially exempt from income tax for tax years beginning April 1, 2019 through March 31, 2024. A portion of these tax incentives will expire at the beginning April 1, 2020. In March 2016, the FASB issued ASU 2016-09, Stock Compensation Improvements to Employee Share-Based Payment Accounting. The components of the Company’s deferred tax assets and liabilities are as follows (in thousands): Year Ended December 31, 2017 2016 Deferred tax assets: Credits and net operating loss carryforward $ 90,729 $ 78,813 Accrued compensation (31 ) 2,771 Deferred revenues 54 112 Stock-based compensation 7,416 9,910 Property and equipment 1,231 (898 ) Other deferred tax assets 1,495 3,073 Total deferred tax assets 100,894 93,781 Valuation allowance (84,619 ) (87,190 ) Deferred tax liabilities: Basis difference on purchased intangible assets 6,559 9,160 Other deferred tax liabilities 11,406 — Total deferred tax liabilities 17,965 9,160 Net deferred tax assets (liabilities) $ (1,690 ) $ (2,569 ) Other deferred tax assets and liabilities are primarily comprised of the tax effects of accounts receivable reserves, sales allowances, deferred rent, and other miscellaneous accruals. As of December 31, 2017 and 2016, the Company had gross deferred tax assets of $100.9 million and $93.8 million, respectively. The Company also had deferred tax liabilities of $18.0 million and $9.2 million as of December 31, 2017 and 2016, respectively. Realization of the deferred tax assets is dependent upon the generation of future taxable income, if any, the amount and timing of which is uncertain. Based on the available objective evidence, and historical operating performance, management believes that it is more likely than not that all U.S. and certain foreign deferred tax assets are not realizable. Accordingly, the net deferred tax assets have been fully offset with a valuation allowance. The net valuation allowance decreased by approximately $2.6 million and increased $1.4 million for the years ended December 31, 2017 and 2016, respectively. As of December 31, 2017, the Company had federal net operating loss carryforwards of approximately $271.4 million which will begin to expire in 2018. The Company had state net and foreign operating loss carryforwards of approximately $187.1 million and $11.7 million, respectively, of which $7.4 million have expired in 2017. As of December 31, 2017, the Company has research credit carryforwards for federal income tax purposes of approximately $12.9 million which will begin to expire in the year 2032. The Company also had state net research credit carryforwards for income tax purposes of approximately $14.9 million which can be carried forward indefinitely. A reconciliation of the gross unrecognized tax benefit is as follows (in thousands): Year Ended December 31, 2017 2016 2015 Unrecognized tax benefit - beginning balance $ 6,447 $ 8,759 $ 1,366 Increases for tax positions taken in prior years 16 313 5,611 Decreases for tax positions taken in prior years — (785 ) — Increases for tax positions taken in current year 1,064 1,163 1,782 Settlements — (3,003 ) — Unrecognized tax benefit - ending balance $ 7,527 $ 6,447 $ 8,759 The unrecognized tax benefits, if recognized, would not impact the Company's effective tax rate as the recognition of these tax benefits would be offset by changes in the Company's valuation allowance. The Company does not believe there will be any material changes in its unrecognized tax benefits over the next twelve months. The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense. As of December 31, 2017 and 2016, the Company had no accrued interest or penalties related to uncertain tax positions. Due to the Company’s historical loss position, all tax years from inception through December 31, 2017 remain open due to unutilized net operating losses. The Company files income tax returns in the United States and various states and foreign jurisdictions and is subject to examination by various taxing authorities including major jurisdiction like the United States. As such, all its net operating loss and research credit carryforwards that may be used in future years are subject to adjustment, if and when utilized. Utilization of the net operating loss carryforwards and credits may be subject to a substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before their utilization. During the year ended December 31, 2017, the Internal Revenue Service (IRS) and Quotient settled all outstanding items related to its federal income tax returns for the tax year 2014. The effect of the IRS settlement is zero as of December 31, 2017.

Net Income (Loss) per Share

Net Income (Loss) per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	12. Net Income (Loss) per Share Net Loss per Share Attributable to Common Stockholders The computation of the Company’s basic and diluted net loss per share is as follows (in thousands, except per share data): Year Ended December 31, 2017 2016 2015 Net loss $ (15,077 ) $ (19,479 ) $ (26,730 ) Weighted-average number of shares used to compute net loss per share, basic and diluted 89,505 84,157 82,807 Net loss per share, basic and diluted $ (0.17 ) $ (0.23 ) $ (0.32 ) Basic and diluted net loss per share is the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-dilutive. The outstanding common equivalent shares excluded from the computation of the diluted net loss per share for the periods presented because including them would have been antidilutive are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Stock options and ESPP 7,465 7,854 8,575 Restricted stock units 5,194 5,504 6,786 Shares held in escrow 1,000 2,000 — Shares related to convertible senior notes 11,521 — — 25,180 15,358 15,361

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	13. Commitments and Contingencies Leases The Company leases office space under non-cancelable operating leases with lease terms ranging from one to seven years. Additionally, the Company leases certain equipment under non-cancelable operating leases at its facilities and its leased data center operations. Rent expense was $4.3 million, $4.4 million and $3.1 million for the years ended December 31, 2017, 2016 and 2015, respectively. During the fourth quarter of 2017, the Company recorded a restructuring charge of $2.1 million, related to facility exit costs which primarily relates to future contractual lease payments, in general and administrative expense on the consolidated statements of operations. As of December 31, 2017, the Company had a remaining restructuring accrual balance of $1.9 million included in other current liabilities and other non-current liabilities on the consolidated balance sheets. Aggregate Future Contractual Obligations and Lease Commitments As of December 31, 2017, the Company’s unconditional purchase commitments and minimum payments under its non-cancelable operating and capital leases are as follows (in thousands): Operating Leases Capital Leases 2018 $ 4,691 $ 48 2019 4,358 13 2020 2,140 — 2021 807 — 2022 827 — 2023 and thereafter 1,330 — Total minimum payments $ 14,153 $ 61 Less: Amount representing interest 2 Present value of capital lease obligations 59 Less: Current portion 47 Capital lease obligation, net of current portion $ 12 Other Future Commitments The Company has unconditional purchase commitments which expire through 2034 in the amount of $6.5 million for marketing arrangements relating to the purchase of a 20-year suite license for a professional sports team which it uses for sales and marketing purposes. The Company also has unconditional purchase commitments, primarily related to software license fees and marketing services, of $7.7 million as of December 31, 2017. Promissory Note In January 2017, the Company entered into a promissory note agreement with a lender to finance the purchase of computer equipment for $0.8 million to be paid in quarterly installments over three years. As of December 31, 2017, the Company had a remaining balance of $0.6 million under the agreement, which is included in other current liabilities and other non-current liabilities on the consolidated balance sheets. Indemnification In the normal course of business, to facilitate transactions related to the Company’s operations, the Company indemnifies certain parties, including CPGs, advertising agencies and other third parties. The Company has agreed to hold certain parties harmless against losses arising from claims of intellectual property infringement or other liabilities relating to or arising from our products, services or other contractual infringement. The term of these indemnity provisions generally survive termination or expiration of the applicable agreement. To date, the Company has not recorded any liabilities related to these agreements. Litigation In the ordinary course of business, the Company may be involved in lawsuits, claims, investigations, and proceedings consisting of intellectual property, commercial, employment, and other matters. The Company records a provision for these claims when it is both probable that a liability has been incurred and the amount of the loss, or a range of the potential loss, can be reasonably estimated. These provisions are reviewed regularly and adjusted to reflect the impacts of negotiations, settlements, rulings, advice of legal counsel, and other information or events pertaining to a particular case. In the event that one or more of these matters were to result in a claim against the Company, an adverse outcome, including a judgment or settlement, may cause a material adverse effect on the Company’s future business, operating results, or financial condition. The Company believes that liabilities associated with any claims are remote, therefore the Company has not recorded any accrual for claims as of December 31, 2017 and 2016. The Company expenses legal fees in the period in which they are incurred.

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2017
Defined Contribution Pension And Other Postretirement Plans Disclosure [Abstract]
Employee Benefit Plan	14. Employee Benefit Plan The Company maintains a defined-contribution plan in United States that is intended to qualify under Section 401(k) of the Internal Revenue Code. The 401(k) plan provides retirement benefits for eligible employees. Eligible employees may elect to contribute to the 401(k) plan. The Company provides a match of up to the lesser of 3% of each employee’s annual salary or $6,000, which vests fully after four years of continuous employment. The Company’s matching contribution expense was $1.6 million, $1.7 million and $1.6 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Concentrations

Concentrations	12 Months Ended
	Dec. 31, 2017
Risks And Uncertainties [Abstract]
Concentrations	15. Concentrations As of December 31, 2017, there was no customer with an accounts receivable balance greater than 10% of total accounts receivable. As of December 31, 2016, there was one customer with an accounts receivable balance greater than 10% of total accounts receivable. For the year ended December 31, 2017, there was no customer that accounted for revenues greater than 10% of total revenues. For the years ended December 31, 2016 and 2015, there was one customer that accounted for revenues greater than 10% of total revenues.

Information About Geographic Ar

Information About Geographic Areas	12 Months Ended
	Dec. 31, 2017
Segments Geographical Areas [Abstract]
Information About Geographic Areas	16. Information About Geographic Areas Revenues generated outside of the United States were insignificant for all periods presented. Additionally, as the Company’s assets are primarily located in the United States, information regarding geographical location is not presented, as such amounts are immaterial to these consolidated financial statements taken as a whole.

Summary of Significant Accoun24

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 accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). The Company’s consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results may differ from the Company’s estimates, and such differences may be material to the accompanying consolidated financial statements.
Cash, Cash Equivalents and Short-term Investments	Cash, Cash Equivalents and Short-term Investments The Company considers all highly liquid investments with original maturities of three months or less at the time of purchase to be cash equivalents. The Company’s short-term investments consists of certificates of deposits with original maturities of greater than three months and remaining maturities less than one year as of the balance sheet date.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recorded at invoiced amounts and do not bear interest. The Company generally does not require collateral and performs ongoing credit evaluations of its customers and maintains allowances for potential credit losses. The Company maintains an allowance for doubtful accounts based upon the expected collectability of its accounts receivable. The allowance is determined based upon specific account identification
Property and Equipment, Net	Property and Equipment, net Property and equipment, net, are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets, which are three years for computer equipment and software and five years for all other asset categories except leasehold improvements, which are amortized over the shorter of the lease term or the expected useful life of the improvements. Equipment leased under capital leases is amortized over the shorter of the lease term or the asset’s estimated useful life.
Internal-Use Software Development Costs	Internal-Use Software Development Costs For costs incurred for computer software developed or obtained for internal use, the Company begins to capitalize its costs to develop software when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. These costs are amortized to cost of revenues over the estimated useful life of the related asset, generally estimated to be three years. Costs incurred prior to meeting these criteria together with costs incurred for training and maintenance are expensed as incurred and recorded in research and development expense on the Company’s consolidated statements of operations.
Leases	Leases Leases meeting certain criteria are accounted for as capital leases. The imputed interest is included in interest expense in the accompanying consolidated statements of operations, and the capitalized value is amortized as part of the Company’s property and equipment, net. Obligations under capital leases are reduced by lease payments, net of imputed interest. All other leases are accounted for as operating leases. When an operating lease contains a predetermined fixed escalation of the minimum rent, or if tenant allowances have been received, the related rent expense is recognized on a straight-line basis over the term of the lease, with the difference between the recognized rent expense and amounts payable under the lease recorded as deferred rent liability.
Business Combinations	Business Combinations The Company accounts for acquisitions of entities that include inputs and processes and have the ability to create outputs as business combinations. Under the acquisition method of accounting, the total consideration is allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values at the acquisition dates. The excess of the consideration transferred over those fair values is recorded as goodwill. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Acquisition related costs are not considered part of the consideration, and are expensed as general and administrative expense as incurred. Contingent consideration, if any is measured at fair value initially on the acquisition date as well as subsequently at the end of each reporting period, typically based on the expected achievement of certain financial metrics, until, the assessment period is over and it gets finally settled.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Intangible assets with a finite life are amortized over their estimated useful lives. Goodwill is tested for impairment at least annually, and more frequently upon the occurrence of certain events that may indicate that the carrying value of goodwill may not be recoverable. The Company completes its annual impairment test during the fourth quarter of each year,
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets Such assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured first by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, an impairment loss would be recognized for an amount by which the carrying amount of the asset exceeds the fair value of the asset. During the third quarter of 2016, the Company recorded a one-time charge associated with certain distribution fees under an arrangement with a retailer partner that were deemed unrecoverable. When the Company delivers a digital coupon on a retailer’s website or mobile app or through its loyalty program, or the website or mobile app of a publisher, or through its Retailer iQ platform, and the consumer takes certain actions, the Company pays a distribution fee to the retailer or other publisher, which, in some cases may be prepaid prior to being incurred. The Company considered various factors in its assessment including its historical experience with transaction volumes through the retailer and other comparative retailers, ongoing communications with the retailer to increase its marketing efforts to promote the digital platform, as well as the projected revenues, and associated revenue share payments. Accordingly, during the three months ended September 30, 2016, the Company recognized a one-time charge of $7.4 million related to such distribution fees in cost of revenues on the accompanying consolidated statement of operations. As of December 31, 2017, the Company had no prepaid non-refundable payments with our Retailer iQ partners.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying values of the Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable, accrued compensation and benefits, and other current liabilities, approximate fair value due to their short-term nature. The Company records money market funds, short-term investments and contingent consideration at fair value. See Note 3 (Fair Value Measurements)
Convertible Senior Notes	Convertible Senior Notes In November 2017, the Company issued $200.0 million aggregate principal amount of 1.75% convertible senior notes due 2022 (the “notes”). In accounting for the issuance of the notes, the Company separated the notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the notes as a whole. This difference represents a debt discount that is amortized to interest expense over the terms of the notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the issuance costs related to the notes, the Company allocated the total amount incurred to the liability and equity components. Issuance costs attributable to the liability components are being amortized to expense over the contractual term of the notes, and issuance costs attributable to the equity component were netted with the equity component in additional paid-in capital.
Revenue Recognition	Revenue Recognition The Company derives revenues primarily from the set-up and activation of coupons and coupons codes, and digital media services. The Company recognizes revenue when all four of the following criteria are met: • Persuasive evidence of an arrangement exists; • Delivery has occurred or a service has been provided; • Customer fees are fixed or determinable; and • Collection is reasonably assured. Coupons. The Company generates revenues, as consumers select, activate, or redeem a coupon through our platform by either printing it for physical redemption at a retailer or saving it to a retailer loyalty account for automatic digital redemption. In the case of the setup fees, it recognizes revenues proportionally, on a per activation basis, using the number of authorized activations per insertion order, commencing on the date of the first coupon activation. For coupons, the pricing is generally determined on a per unit activation basis. Setup fees charged to customers represent charges for the creation of digital coupons and related activation, tracking and security features. Upfront insertion orders generally include a limit on the number of activations, or times consumers may select a coupon. Coupon Codes . The Company generally generates revenues when a consumer makes a purchase using a coupon code from its platform and completion of the order is reported to the Company. In the same period that the Company recognize revenues for the delivery of coupon codes, it also estimates and record a reserve, based upon historical experience, to provide for end-user cancelations or product returns which may not be reported until a subsequent date. Digital Media - The Company’s media services enable CPGs and retailers to deliver digital media to promote their brands and products on the Company’s websites and mobile apps, and through the Company’s affiliate publishers and non-publisher third parties. The Company charges a fee for these media campaigns, the pricing of which is based on the advertisement size and position. Related fees are generally billed monthly, based on a per-campaign, per-impression or per-click basis. The Company does not offer rights of refund of previously paid or delivered amounts, rebates, rights of return or price protection. In all instances, the Company limits the amount of revenue recognized to the amounts for which it have the right to bill its’ customers.
Gross versus Net Revenue Reporting	Gross versus Net Revenue Reporting In the normal course of business and through its distribution network, the Company delivers digital coupons and media on retailers’ websites, through retailers’ loyalty programs, and on the websites of digital publishers. In these situations, the Company generally pays a distribution fee to the retailers or publishers which is included in the Company’s cost of revenues. The determination of whether revenues should be reported on a gross or net basis is based on an assessment of whether the Company is acting as the principal or an agent in the transaction. In determining whether the Company is the principal or an agent, the Company follows the accounting guidance for principal-agent considerations. Because the Company is the primary obligor and is responsible for (i) fulfilling the digital coupon and media delivery, (ii) establishing the selling prices for delivery of the digital coupons and media, and (iii) performing all billing and collection activities including retaining credit risk, the Company has concluded that it is the principal in these arrangements and therefore the Company reports revenues and cost of revenues on a gross basis.
Multiple-element Arrangements	Multiple-element Arrangements For arrangements with multiple-deliverables, the Company determines whether each of the individual deliverables qualify as a separate unit of accounting. In order to treat deliverables in a multiple element arrangement as a separate unit of accounting, the deliverable must have standalone value upon delivery. The Company allocates the arrangement fee to all the deliverables (separate units of accounting) using the relative selling price method in accordance with the selling price hierarchy, which includes vendor-specific objective evidence (“VSOE”) if available, third-party evidence (“TPE”) if VSOE is not available and best estimate of selling price (“BESP”) if neither VSOE nor TPE is available. VSOE and TPE do not currently exist for any of the Company’s deliverables. Accordingly, for arrangements with multiple deliverables that can be separated into different units of accounting, the Company allocates the arrangement fee to the separate units of accounting based on BESP. The Company determines BESP for deliverables by considering multiple factors, including, but not limited to, prices it charges for similar offerings, market conditions, competitive landscape and pricing practices. The Company limits the amount of allocable arrangement consideration to amounts that are fixed or determinable and that are not contingent on future performance or future deliverables.
Deferred Revenues	Deferred Revenues Deferred revenues consist of coupon setup fees, activation fees, and digital media fees that are expected to be recognized upon coupon activations, or delivery of media impressions or clicks, which generally occurs within the next twelve months.
Cost of Revenues	Cost of Revenues Cost of revenues consist primarily of distribution fees, personnel costs and depreciation and amortization expense, software and acquired intangible assets incurred on revenue producing technologies, data center costs, third-party service fees including traffic acquisition costs and purchase of third party data. Distribution fees consist of payments to partners within the Company’s network for their digital coupon publishing services. Personnel costs include salaries, bonuses, stock-based awards and employee benefits. The personnel costs are primarily attributable to individuals maintaining the Company’s data centers and operations, which initiate, sets up and deliver digital coupon media campaigns. Depreciation and amortization expense includes depreciation of data center equipment and amortization of capitalized internal use software.
Research and Development Expense	Research and Development Expense The Company expenses the cost of research and development as incurred. Research and development expense consists primarily of personnel and related headcount costs and costs of professional services associated with the ongoing development of the Company’s technology.
Stock-based Compensation	Stock-based Compensation The Company accounts for stock-based compensation using the fair value method, which requires the Company to measure the stock-based compensation based on the grant-date fair value of the awards and recognize the compensation expense over the requisite service period. The Company adopted ASU 2016-09 Stock Compensation Improvements to Employee Share-Based Payment Accounting
Advertising Expense	Advertising Expense Advertising costs are expensed when incurred and are included in sales and marketing expense on the accompanying consolidated statements of operations. The Company incurred $1.0 million, $2.7 million and $1.4 million of advertising costs during the years ended December 31, 2017, 2016 and 2015, respectively. Advertising costs consist primarily of online marketing costs, such as sponsored search, advertising on social networking sites, e-mail marketing campaigns, loyalty programs, and affiliate programs.
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with authoritative guidance, which requires the use of the liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the consolidated financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply to taxable income in the years in which the differences are expected to reverse. A valuation allowance is provided when it is more likely than not that the deferred tax assets will not be realized. The Company recognizes liabilities for uncertain tax positions based upon a two-step process. To the extent a tax position does not meet a more-likely-than-not level of certainty, no benefit is recognized in the consolidated financial statements. If a position meets the more-likely-than-not level of certainty, it is recognized in the consolidated financial statements at the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. The Company accounts for any applicable interest and penalties as a component of income tax expense.
Foreign Currency	Foreign Currency Foreign currency denominated assets and liabilities of foreign subsidiaries, where the local currency is the functional currency, are translated into U.S. Dollars using the exchange rates in effect at the balance sheet dates, and income and expenses are translated using average exchange rates during the period. The resulting foreign currency translation adjustments are recorded in accumulated other comprehensive income (loss), a component of stockholders’ equity. Prior to the first quarter of 2016, the functional currency of each of the Company’s international subsidiaries was the local currency, as its international subsidiaries negotiated and managed business locally with minimal involvement from the U.S. parent entity. Beginning the first quarter of 2016, the functional currency of certain international subsidiaries changed from its local currency to U.S. Dollar (“USD”). The change in functional currency was the result of changes in the Company’s international strategy primarily resulting from the acquisition of Shopmium S.A. (a private company based in France). The Company acquired Shopmium S.A. as part of its strategy to broaden international operations and subsequently, the Company reviewed its international strategy, including management of its relationships with international CPG brands, evaluation of worldwide competition and international pricing strategy, its plan to manage future billings and collections for international customers and plan to further develop the acquired technology for its subsequent use by various entities. Consequently, as part of the Company’s new international strategy and changes to the way the Company runs its business internationally, it modified its existing international structure and entered into various inter-company licensing agreements between its U.S. entity and certain international entities. As these changes were significant, the Company considered the economic factors outlined in ASC 830, Foreign Currency Matters, The change in functional currency is applied on a prospective basis beginning with our first quarter of 2016 and translation adjustments for prior periods will continue to remain as a component of accumulated other comprehensive loss. Gains and losses from foreign currency transactions are included in other income (expense), net in the accompanying consolidated statements of operations. Foreign currency transaction gains (losses) were immaterial for all the periods presented in the accompanying consolidated financial statements.
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Other comprehensive income (loss) consists of foreign currency translation adjustments.
Net Income (Loss) per Share	Net Income (Loss) per Share The Company’s basic net income (loss) per share attributable to common stockholders is computed by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding during the period. The diluted net income (loss) per share is computed by giving effect to all potentially dilutive common share equivalents outstanding during the period. The dilutive effect of dilutive common share equivalents is reflected in diluted net income (loss) per share by application of the treasury stock method. Since the Company intends to settle the principal amount of its outstanding convertible senior notes in cash, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The effects of options to purchase common stock, RSUs, certain shares held in escrow, and convertible senior notes are excluded from the computation of diluted net loss per share attributable to common stockholders because their effect is antidilutive.
Segments	Segments The Company’s chief operating decision maker, who is the Chief Executive Officer, reviews the Company’s financial information presented on a consolidated basis for purposes of allocating resources and evaluating our financial performance. There are no segment managers who are held accountable by the chief operating decision maker, or anyone else, for operations, operating results, and planning for levels or components below the consolidated unit level. Accordingly, the Company has determined that it operates in one single reporting segment.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents, short-term investments and accounts receivable. For cash, cash equivalents and short-term investments, the Company is exposed to credit risk in the event of default by the financial institutions to the extent of the amounts recorded on the accompanying consolidated balance sheets. Credit risk with respect to accounts receivable is dispersed due to the large number of customers. The Company does not require collateral for accounts receivable.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Accounting Pronouncements Not Yet Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). Early adoption is permitted, but not before the original effective date of the amendment, which was the first quarter of 2017. The Company has completed its evaluation of the overall impact of the new standard on its accounting policies, processes, system requirements, and internal controls over financial reporting. In addition to internal resources, the Company engaged third-party service providers to assist with the evaluation. The Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new standard. The Company will adopt the new revenue standard in the first quarter of 2018 using the modified retrospective method, and does not expect a material impact on the amount and timing of revenue recognized in its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows Classification of Certain Cash Receipts and Cash Payments Accounting Pronouncements Adopted In March 2016, the FASB issued ASU 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The Company’s fair value hierarchy for its financial assets and liabilities that are measured at fair value on a recurring basis are as follows (in thousands): December 31, 2017 Level 1 Level 2 Level 3 Total Assets: Money market funds ( 2) 100,152 — — 100,152 Certificate of deposits (3) — 59,902 — 59,902 Total $ 100,152 $ 59,902 $ — $ 160,054 Liabilities: Contingent consideration related to Crisp acquisition (1) — — 18,500 18,500 Contingent consideration related to Shopmium acquisition (4) — — — — Total $ — $ — $ 18,500 $ 18,500 December 31, 2016 Level 1 Level 2 Level 3 Total Assets: Certificate of deposits (3) — 69,172 — 69,172 Total $ — $ 69,172 $ — $ 69,172 Liabilities: Contingent consideration related to Shopmium acquisition (4) — — 185 185 Total $ — $ — $ 185 $ 185 (1) Included in contingent consideration related to acquisitions (2) Included in cash and cash equivalents (3) Included in short-term investments (4) Included in other non-current liabilities
Summary of Changes in Contingent Consideration	The following table represents the change in the contingent consideration (in thousands): Shopmium Crisp Level 3 Level 3 Balance as of December 31, 2016 $ 185 $ — Addition related to Crisp acquisition — 14,800 Change in fair value (185 ) 3,700 Balance as of December 31, 2017 $ — $ 18,500

Allowance for Doubtful Accoun26

Allowance for Doubtful Accounts (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Summary of Activity in Allowance for Doubtful Accounts	The summary of activities in the allowance for doubtful accounts is as follows (in thousands): Year Ended December 31, 2017 2016 2015 Balance at beginning of period $ 1,338 $ 833 $ 408 Additions related to Crisp acquisition 229 — — Bad debt expense (recovery) (655 ) 652 680 Write-offs, net (126 ) (147 ) (255 ) Balance at end of period $ 786 $ 1,338 $ 833

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Property and Equipment, Net	Property and equipment consist of the following (in thousands): December 31, 2017 2016 Software $ 33,198 $ 32,286 Computer equipment 24,342 22,664 Leasehold improvements 7,905 8,141 Furniture and fixtures 2,107 2,296 Total 67,552 65,387 Accumulated depreciation and amortization (55,752 ) (50,249 ) Projects in process 4,810 1,238 Property and equipment, net $ 16,610 $ 16,376
Accrued Compensation and Benefits	Accrued compensation and benefits consist of the following (in thousands): December 31, 2017 2016 Bonus $ 7,212 $ 5,985 Commissions 4,199 3,572 Vacation 371 1,916 Payroll and related expenses 2,132 1,729 Accrued compensation and benefits $ 13,914 $ 13,202
Other Current Liabilities	Other current liabilities consist of the following (in thousands): December 31, 2017 2016 Distribution fees $ 18,485 $ 12,463 Marketing expenses 2,826 3,383 Prefunded Liability 2,151 1,345 Traffic Acquisition Cost 3,040 — Other 9,036 3,673 Other current liabilities $ 35,538 $ 20,864

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Schedule of Consideration Paid for Each Acquisition and the Related Fair Values of Assets Acquired and Liabilities Assumed	Assets acquired and liabilities assumed were recorded at their fair values as of the respective acquisition dates. The following table summarizes the consideration paid for each acquisition and the related fair values of the assets acquired and liabilities assumed (in thousands): Purchase Consideration Net Tangible Assets Acquired/ (Liabilities Assumed) Identifiable Intangible Assets Goodwill Goodwill Deductible for Taxes Acquisition Related Expenses (1) Crisp $ 51,904 $ 5,893 $ 9,400 $ 36,611 Not $ 1,504 Shopmium 19,461 (1,383 ) 5,803 15,041 Not 333 $ 71,365 $ 4,510 $ 15,203 $ 51,652 $ 1,837 (1) Expensed as general and administrative
Component of Identifiable Intangible Assets	The following table sets forth each component of identifiable intangible assets acquired in connection with the acquisitions: (in thousands): Crisp Shopmium Total Estimated Useful Life (in Years) Developed technologies $ 5,000 $ 3,343 $ 8,343 4 - 5 Customer relationships 2,800 1,696 4,496 5 - 7 Domain names — 344 344 5 Trade names 1,600 — 1,600 4 Vendor relationships — — — 4 Registered users — 420 420 4 Patents — — — 5 Total identifiable intangible assets $ 9,400 $ 5,803 $ 15,203

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Carrying Value of Goodwill	The changes in the carrying value of goodwill are as follows (in thousands): Goodwill Balance as of December 31, 2016 $ 43,895 Acquisition of Crisp 36,611 Balance as of December 31, 2017 $ 80,506
Intangible Assets	Intangible assets consist of the following (in thousands): December 31, 2017 Gross Accumulated Amortization Net Weighted Average Amortization Period (Years) Promotion service rights $ 22,492 $ (4,252 ) $ 18,240 6.1 Developed technologies 12,187 (5,013 ) 7,174 3.0 Customer relationships 11,660 (6,547 ) 5,113 4.3 Data access rights 10,801 (2,666 ) 8,135 4.3 Media service rights 6,383 (1,575 ) 4,808 4.3 Domain names 5,949 (4,689 ) 1,260 1.3 Trade names 1,767 (401 ) 1,366 3.4 Patents 975 (769 ) 206 4.5 Vendor relationships 890 (890 ) — — Registered users 420 (232 ) 188 2.2 $ 73,524 $ (27,034 ) $ 46,490 4.7 As of December 31, 2017 and 2016, the Company has a domain name with a gross value of $0.4 million with an indefinite useful life that is not subject to amortization. December 31, 2016 Gross Accumulated Amortization Net Weighted Average Amortization Period (Years) Promotion service rights $ 22,492 $ (1,256 ) $ 21,236 7.1 Data access rights 10,801 (787 ) 10,014 5.3 Customer relationships 8,860 (4,951 ) 3,909 3.1 Developed technologies 7,187 (2,926 ) 4,261 3.3 Media service rights 6,383 (465 ) 5,918 5.3 Domain names 5,948 (4,070 ) 1,878 2.2 Patents 975 (718 ) 257 5.6 Vendor relationships 890 (667 ) 223 1.0 Registered users 420 (129 ) 291 3.3 Trade names 167 (167 ) — — $ 64,123 $ (16,136 ) $ 47,987 5.6
Estimated Amortization of Intangible Assets	Estimated amortization expense related to intangible assets is as follows (in thousands): Total 2018 $ 11,467 2019 10,378 2020 8,962 2021 7,104 2022 4,408 Thereafter 3,818 Total estimated amortization expense $ 46,137

Debt Obligations (Tables)

Debt Obligations (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Net Carrying Amount of Liability Component	The net carrying amount of the liability component of the notes recorded in convertible senior notes, net on the consolidated balance sheets was as follows (in thousands): December 31, 2017 Principal $ 200,000 Unamortized debt discount (49,631 ) Unamortized debt issuance costs (4,548 ) Net carrying amount of the liability component $ 145,821
Schedule of Net Carrying Amount of Equity Component	The net carrying amount of the equity component of the notes recorded in additional paid-in capital on the consolidated balance sheets was as follows (in thousands): December 31, 2017 Debt discount related to value of conversion option $ 50,670 Debt Issuance costs (1,580 ) Net carrying amount of the equity component $ 49,090
Schedule Of Interest Expense	The following table sets forth the interest expense related to the notes recognized in interest expense on the consolidated statements of operations (in thousands): Year Ended December 31, 2017 Contractual interest expense $ 406 Amortization of debt discount 1,039 Amortization of debt issuance costs 109 Total interest expense related to the Notes $ 1,554

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Assumptions Used to Estimate the Fair Value of Stock Options	The fair value of each option was estimated using Black-Scholes model on the date of grant for the periods presented using the following assumptions: Year Ended December 31, 2017 2016 2015 Expected life (in years) 5.50 - 6.25 2.30 - 6.08 5.50 - 6.08 Risk-free interest rate 1.87% - 2.14% 0.68% - 1.34% 1.67% - 1.89% Volatility 50 % 55% - 70% 55% - 60% Dividend yield — — —
Summary of Stock Option and Restricted Stock Units Award Activity	A summary of the Company’s stock option and RSUs award activity under the Plans is as follows: Options Outstanding RSUs Outstanding Shares Available for Grant Number Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Number of Shares Weighted Average Grant Date Fair Value Balance as of December 31, 2014 1,825,112 9,494,763 $ 7.00 6.57 $ 107,913 6,809,415 $ 12.66 Increase in shares authorized 3,255,200 — — — — — — Options granted (328,680 ) 328,680 10.05 — — — — Options exercised — (1,232,184 ) 3.31 — 10,246 — — Options canceled or expired 121,593 (121,593 ) 9.35 — — — — RSUs granted (3,673,053 ) — — — — 3,673,053 12.43 RSUs released — — — — — (2,006,893 ) 11.64 RSUs canceled or expired 1,689,129 — — — — (1,689,129 ) 12.80 Balance as of December 31, 2015 2,889,301 8,469,666 $ 7.62 5.91 $ 19,231 6,786,446 $ 13.14 Increase in shares authorized 3,279,811 — — — — — — Options granted (2,197,432 ) 2,197,432 8.99 — — — — Options exercised — (2,328,197 ) 4.54 — 15,485 — — Options canceled or expired 592,834 (592,834 ) 8.97 — — — — RSUs granted (2,855,267 ) — — — — 2,855,267 10.37 RSUs released — — — — — (2,422,146 ) 11.92 RSUs canceled or expired 1,715,483 — — — — (1,715,483 ) 11.81 Balance as of December 31, 2016 3,424,730 7,746,067 $ 8.83 6.12 $ 30,507 5,504,084 $ 12.02 Increase in shares authorized 3,542,416 — — — — — — Options granted (1,319,680 ) 1,319,680 $ 12.76 — — — — Options exercised — (1,435,484 ) $ 4.32 — $ 10,768 — — Options canceled or expired 218,035 (218,035 ) $ 10.34 — — — — RSUs and PSUs granted (2,517,721 ) — — — — 2,517,721 $ 12.04 RSUs released — — — — — (2,040,504 ) $ 12.20 RSUs canceled or expired 787,009 — — — — (787,009 ) $ 11.47 RSUs withheld for taxes 290,366 — — — — — — Balance as of December 31, 2017 4,425,155 7,412,228 $ 10.36 6.09 $ 25,415 5,194,292 $ 12.26 Vested and exercisable as of December 31, 2017 5,345,298 $ 10.02 5.08 $ 22,891
Summary of Option Outstanding and Exercisable	Additional information for options outstanding and exercisable as of December 31, 2017 is as follows: Options Outstanding Options Exercisable Weighted Weighted Weighted Remaining Average Average Number of Contractual Exercise Number of Exercise Exercise Prices Shares (Years) Price Shares Price $0.15 - $5.33 1,810,210 2.69 $ 2.47 1,810,210 $ 2.47 $5.48 - $8.51 1,554,928 7.97 8.31 793,126 8.13 $8.65 - $13.00 2,392,355 7.43 10.94 1,224,054 9.17 $13.04 - $16.25 854,735 6.37 15.46 717,908 15.88 $ 25.00 800,000 5.87 $ 25.00 800,000 $ 25.00 7,412,228 5,345,298
Summary of Assumptions Used to Estimate the Fair Value of Employee Stock Purchase Plan	The fair value of the option feature is estimated using the Black-Scholes model for the period presented based on the following assumptions: Year Ended December 31, 2017 2016 2015 Expected life (in years) 0.50 0.50 0.50 Risk-free interest rate 0.62% - 1.42% 0.38% - 0.62% 0.08% - 0.33% Volatility 40% - 50% 50% - 74% 63% - 72% Dividend yield — — —
Schedule of Stock Based Compensation Expense	The following table sets forth the total stock-based compensation expense resulting from stock options, RSUs, and ESPP included in the Company’s consolidated statements of operations (in thousands): Year Ended December 31, 2017 2016 2015 Cost of revenues $ 2,000 $ 1,821 $ 1,728 Sales and marketing 6,621 5,776 10,658 Research and development 7,949 7,286 9,680 General and administrative 15,682 13,403 10,280 Total stock-based compensation expense $ 32,252 $ 28,286 $ 32,346

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of Loss Before Provision for (Benefit from) Income Taxes	The components of the Company’s loss before provision for (benefit from) income taxes were as follows (in thousands): Year Ended December 31, 2017 2016 2015 Domestic $ 12,770 $ 18,041 $ 25,385 Foreign 3,009 1,197 1,906 Total $ 15,779 $ 19,238 $ 27,291
Components of Provision for (Benefit from) Income Taxes	The components of the provision for (benefit from) income taxes are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Current: Federal $ — $ 43 $ — State 4 8 2 Foreign 173 84 91 Total current income tax expense (benefit) 177 135 93 Deferred: Federal (673 ) 142 (317 ) State 84 14 (23 ) Foreign (290 ) (50 ) (314 ) Total deferred income tax expense (benefit) (879 ) 106 (654 ) Total $ (702 ) $ 241 $ (561 )
Reconciliation of Statutory Income Tax Rate	A reconciliation of the federal statutory income tax rate to the Company’s effective tax rate is as follows: Year Ended December 31, 2017 2016 2015 Federal tax (34.00 %) (34.00 %) (34.00 %) State income tax, net of federal tax benefit 0.56 % 0.11 % (0.08 %) Tax credits (8.29 %) (8.14 %) (4.60 %) Stock-based compensation (0.54 %) 1.52 % 0.67 % Foreign income taxes at other than U.S. rates 5.74 % 2.29 % 1.56 % Acquisition related costs 1.66 % — 0.76 % Contingent consideration related to acquisitions 12.28 % (9.04 %) — Other 2.93 % 2.77 % 0.41 % IRS Settlement — (12.42 %) — Tax Cuts and Jobs Act 175.93 % — — Valuation allowance, net (160.72 %) 58.16 % 33.22 % Effective tax rate (4.45 %) 1.25 % (2.06 %)
Components of Deferred Tax Assets and Liabilities	The components of the Company’s deferred tax assets and liabilities are as follows (in thousands): Year Ended December 31, 2017 2016 Deferred tax assets: Credits and net operating loss carryforward $ 90,729 $ 78,813 Accrued compensation (31 ) 2,771 Deferred revenues 54 112 Stock-based compensation 7,416 9,910 Property and equipment 1,231 (898 ) Other deferred tax assets 1,495 3,073 Total deferred tax assets 100,894 93,781 Valuation allowance (84,619 ) (87,190 ) Deferred tax liabilities: Basis difference on purchased intangible assets 6,559 9,160 Other deferred tax liabilities 11,406 — Total deferred tax liabilities 17,965 9,160 Net deferred tax assets (liabilities) $ (1,690 ) $ (2,569 )
Unrecognized Tax Benefits and Effect on Effective Income Tax Rate	A reconciliation of the gross unrecognized tax benefit is as follows (in thousands): Year Ended December 31, 2017 2016 2015 Unrecognized tax benefit - beginning balance $ 6,447 $ 8,759 $ 1,366 Increases for tax positions taken in prior years 16 313 5,611 Decreases for tax positions taken in prior years — (785 ) — Increases for tax positions taken in current year 1,064 1,163 1,782 Settlements — (3,003 ) — Unrecognized tax benefit - ending balance $ 7,527 $ 6,447 $ 8,759

Net Income (Loss) per Share (Ta

Net Income (Loss) per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Loss Per Share	The computation of the Company’s basic and diluted net loss per share is as follows (in thousands, except per share data): Year Ended December 31, 2017 2016 2015 Net loss $ (15,077 ) $ (19,479 ) $ (26,730 ) Weighted-average number of shares used to compute net loss per share, basic and diluted 89,505 84,157 82,807 Net loss per share, basic and diluted $ (0.17 ) $ (0.23 ) $ (0.32 )
Schedule of Outstanding Common Equivalent Shares Excluded from Computation of Diluted Net Loss Per Share	The outstanding common equivalent shares excluded from the computation of the diluted net loss per share for the periods presented because including them would have been antidilutive are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Stock options and ESPP 7,465 7,854 8,575 Restricted stock units 5,194 5,504 6,786 Shares held in escrow 1,000 2,000 — Shares related to convertible senior notes 11,521 — — 25,180 15,358 15,361

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Minimum Payments Under Non-cancelable Operating and Capital Leases	As of December 31, 2017, the Company’s unconditional purchase commitments and minimum payments under its non-cancelable operating and capital leases are as follows (in thousands): Operating Leases Capital Leases 2018 $ 4,691 $ 48 2019 4,358 13 2020 2,140 — 2021 807 — 2022 827 — 2023 and thereafter 1,330 — Total minimum payments $ 14,153 $ 61 Less: Amount representing interest 2 Present value of capital lease obligations 59 Less: Current portion 47 Capital lease obligation, net of current portion $ 12

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Additional Information (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2017USD ($)Segment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jan. 01, 2017USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of assets			3 years
Impairment of goodwill			$ 0	$ 0	$ 0
One-time charge related to distribution fees		$ 7,400,000		7,435,000
Impairment of long-lived assets			0		0
Prepaid non-refundable payments			$ 0
Deferred revenue, description			Deferred revenues consist of coupon setup fees, activation fees, and digital media fees that are expected to be recognized upon coupon activations, or delivery of media impressions or clicks, which generally occurs within the next twelve months.
Deferred revenue, revenue recognized period			12 months
Advertising Cost			$ 1,000,000	$ 2,700,000	$ 1,400,000
Number of reporting segment | Segment			1
ASU 2016-09
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Modified retrospective basis with cumulative effect adjustment, recorded to accumulated deficit balance						$ 3,400,000
Retained Earnings | ASU 2016-09
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Unrecognized excess tax benefits as deferred tax assets, cumulative-effect adjustment to opening retained earnings			$ 25,500,000
Lesser Than Level Of Certainty
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Income tax benefit recognized from uncertain tax positions			$ 0
Greater Than Level Of Certainty
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Income tax benefit minimum percentage from uncertain tax positions			50.00%
1.75% Convertible Senior Notes Due 2022
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Debt instrument aggregate principal amount	$ 200,000,000
Debt instrument fixed interest rate per annum	1.75%
Debt instrument maturity year	2,022
Computer Equipment and Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of assets			3 years
All Other Asset
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of assets			5 years
Cash and Cash Equivalents | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Liquid investments maturity			3 months
Certificates Of Deposits | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Short-term investments maturity			1 year
Certificates Of Deposits | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Short-term investments maturity			3 months

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Assets:
Assets fair value		$ 160,054	$ 69,172
Liabilities:
Liabilities fair value		18,500	185	[1]
Money Market Funds
Assets:
Assets fair value	[2]	100,152
Certificate of deposits
Assets:
Assets fair value	[3]	59,902	69,172
Contingent Consideration | Crisp Acquisition
Liabilities:
Liabilities fair value	[4]	18,500
Contingent Consideration | Shopmium Acquisition
Liabilities:
Liabilities fair value			185
Level 1
Assets:
Assets fair value		100,152
Level 1 | Money Market Funds
Assets:
Assets fair value	[2]	100,152
Level 2
Assets:
Assets fair value		59,902	69,172
Level 2 | Certificate of deposits
Assets:
Assets fair value	[3]	59,902	69,172
Level 3
Liabilities:
Liabilities fair value		18,500	185	[1]
Level 3 | Contingent Consideration | Crisp Acquisition
Liabilities:
Liabilities fair value	[4]	$ 18,500
Level 3 | Contingent Consideration | Shopmium Acquisition
Liabilities:
Liabilities fair value			$ 185
[1]	Included in other non-current liabilities
[2]	Included in cash and cash equivalents
[3]	Included in short-term investments
[4]	Included in contingent consideration related to acquisitions

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017USD ($)$ / shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loss from reclassification of contingent liability	$ 3,500,000
Transfers between fair value hierarchies	0
1.75% Convertible Senior Notes Due 2022 | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of convertible senior notes	196,300,000
Shopmium
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration payout	$ 0
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed net asset value | $ / shares	$ 1

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in Contingent Consideration (Details) - Level 3 $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Shopmium
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance as of December 31, 2016	$ 185
Change in fair value	(185)
Crisp Media, Inc
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Addition related to acquisition	14,800
Change in fair value	3,700
Balance as of December 31, 2017	$ 18,500

Allowance for Doubtful Accoun39

Allowance for Doubtful Accounts - Summary of Activity in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	$ 1,338	$ 833	$ 408
Bad debt expense (recovery)	(655)	652	680
Write-offs, net	(126)	(147)	(255)
Balance at end of period	786	$ 1,338	$ 833
Crisp Acquisition
Accounts Notes And Loans Receivable [Line Items]
Additions related to Crisp acquisition	$ 229

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property and equipment, Total	$ 67,552	$ 65,387
Accumulated depreciation and amortization	(55,752)	(50,249)
Projects in process	4,810	1,238
Property and equipment, net	16,610	16,376
Software
Property Plant And Equipment [Line Items]
Property and equipment, Total	33,198	32,286
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, Total	24,342	22,664
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, Total	7,905	8,141
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, Total	$ 2,107	$ 2,296

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Depreciation	$ 6,900,000	$ 16,000,000	$ 13,100,000
Disposals	1,500,000	5,400,000	2,900,000
Loss on disposals	(85,000)	(476,000)	(146,000)
Capitalized costs	3,800,000	700,000	1,500,000
Amortization expense recognized	600,000	10,500,000	$ 9,400,000
Unamortized costs	$ 4,400,000	$ 1,200,000

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Compensation and Benefits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Bonus	$ 7,212	$ 5,985
Commissions	4,199	3,572
Vacation	371	1,916
Payroll and related expenses	2,132	1,729
Accrued compensation and benefits	$ 13,914	$ 13,202

Balance Sheet Components - Othe

Balance Sheet Components - Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Distribution fees	$ 18,485	$ 12,463
Marketing expenses	2,826	3,383
Prefunded Liability	2,151	1,345
Traffic Acquisition Cost	3,040
Other	9,036	3,673
Other current liabilities	$ 35,538	$ 20,864

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($)	May 31, 2017	Oct. 30, 2015	Dec. 31, 2017
Business Acquisition [Line Items]
Fair value of contingent consideration			$ 18,500,000
Crisp Media, Inc
Business Acquisition [Line Items]
Total acquisition consideration	$ 51,900,000
Cash payments for purchase of assets	$ 24,100,000
Number of shares Issuable	1,177,927
Total acquisition consideration (Values)	$ 13,000,000
Business acquisitions, fair value of common stock per share	$ 11
Contingent consideration payable in cash	$ 24,500,000
Contingent consideration, fair value	$ 14,800,000
Contingent consideration, milestones achievement period	1 year
Contingent consideration payout period	105 days
Business combination, contingent consideration payable start date	May 31, 2018
Shopmium
Business Acquisition [Line Items]
Total acquisition consideration		$ 19,500,000
Cash payments for purchase of assets		$ 16,500,000
Number of shares Issuable		278,639
Total acquisition consideration (Values)		$ 1,500,000
Business acquisitions, fair value of common stock per share		$ 5.54
Contingent consideration payable in cash		$ 4,800,000
Business combination, contingent consideration issuable date			Mar. 31, 2018
Fair value of contingent consideration			$ 0
Contingent consideration payout			$ 0
Shopmium | Scenario One
Business Acquisition [Line Items]
Business combination, contingent consideration milestones date			Dec. 31, 2016
Shopmium | Scenario Two
Business Acquisition [Line Items]
Business combination, contingent consideration milestones date			Dec. 31, 2017

Acquisitions - Schedule of Cons

Acquisitions - Schedule of Consideration Paid for Each Acquisition and the Related Fair Values of Assets Acquired and Liabilities Assumed (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Purchase Consideration	$ 71,365
Net Tangible Assets Acquired/ (Liabilities Assumed)	4,510
Identifiable Intangible Assets	15,203
Goodwill	51,652
Acquisition Related Expenses	1,837
Crisp Media, Inc
Business Acquisition [Line Items]
Purchase Consideration	51,904
Net Tangible Assets Acquired/ (Liabilities Assumed)	5,893
Identifiable Intangible Assets	9,400
Goodwill	$ 36,611
Goodwill Deductible for Taxes	Not Deductible
Acquisition Related Expenses	$ 1,504
Shopmium
Business Acquisition [Line Items]
Purchase Consideration	19,461
Net Tangible Assets Acquired/ (Liabilities Assumed)	(1,383)
Identifiable Intangible Assets	5,803
Goodwill	$ 15,041
Goodwill Deductible for Taxes	Not Deductible
Acquisition Related Expenses	$ 333

Acquisitions - Component of Ide

Acquisitions - Component of Identifiable Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 15,203
Estimated Useful Life (in Years)	3 years
Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 9,400
Shopmium
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	5,803
Developed Technologies
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 8,343
Developed Technologies | Minimum
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful Life (in Years)	4 years
Developed Technologies | Maximum
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful Life (in Years)	5 years
Developed Technologies | Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 5,000
Developed Technologies | Shopmium
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	3,343
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 4,496
Customer Relationships | Minimum
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful Life (in Years)	5 years
Customer Relationships | Maximum
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful Life (in Years)	7 years
Customer Relationships | Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 2,800
Customer Relationships | Shopmium
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 1,696
Vendor Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful Life (in Years)	4 years
Domain Names
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 344
Estimated Useful Life (in Years)	5 years
Domain Names | Shopmium
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 344
Trade Names
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 1,600
Estimated Useful Life (in Years)	4 years
Trade Names | Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 1,600
Registered Users
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 420
Estimated Useful Life (in Years)	4 years
Registered Users | Shopmium
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 420
Patents
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful Life (in Years)	5 years

Goodwill and Intangible Asset47

Goodwill and Intangible Assets - Changes in Carrying Value of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Goodwill [Line Items]
Beginning Balance	$ 43,895
Acquisition of Crisp	51,652
Ending Balance	80,506
Crisp Acquisition
Goodwill [Line Items]
Acquisition of Crisp	$ 36,611

Goodwill and Intangible Asset48

Goodwill and Intangible Assets - Additional Information (Details) $ in Thousands	Aug. 03, 2016USD ($)Installmentshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jan. 15, 2018shares
Goodwill And Intangible Assets [Line Items]
Amortization expense of intangible assets | $		$ 10,900	$ 6,800	$ 3,400
Domain Names
Goodwill And Intangible Assets [Line Items]
Indefinite lived intangible, gross value | $		$ 400	400
Service and Data Agreement
Goodwill And Intangible Assets [Line Items]
Service agreement contractual term	5 years 6 months
Additional service agreement contractual term for certain rights	4 years 6 months
Issuance of common stock for services | shares	3,000,000
Issuance of common stock for services, value | $	$ 39,600		39,570
Common stock issue description		the Company agreed to issue 3,000,000 shares of common stock, out of the 3,000,000 shares issued, 1,000,000 shares were issued within five business days of execution of the Agreement and 2,000,000 shares are held in an escrow and will be released in two equal installments, within 15 business days following the years ending December 31, 2017 and 2018.
Number of installments | Installment	2
Gain due to change in company's stock price | $		$ (2,000)	$ 4,900
Capitalized transaction costs | $	$ 100
Exclusivity Services And Data Agreement
Goodwill And Intangible Assets [Line Items]
Issuance of common stock for services | shares	1,000,000
Shares of common stock held in escrow | shares	2,000,000
Shares released from escrow | shares		1,000,000
Exclusivity Services And Data Agreement | Subsequent Event
Goodwill And Intangible Assets [Line Items]
Shares released from escrow | shares					1,000,000

Goodwill and Intangible Asset49

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross	$ 73,524	$ 64,123
Accumulated Amortization	(27,034)	(16,136)
Net	$ 46,490	$ 47,987
Weighted Average Amortization Period (Years)	4 years 8 months 12 days	5 years 7 months 6 days
Promotion Service Rights
Finite Lived Intangible Assets [Line Items]
Gross	$ 22,492	$ 22,492
Accumulated Amortization	(4,252)	(1,256)
Net	$ 18,240	$ 21,236
Weighted Average Amortization Period (Years)	6 years 1 month 6 days	7 years 1 month 6 days
Developed Technologies
Finite Lived Intangible Assets [Line Items]
Gross	$ 12,187	$ 7,187
Accumulated Amortization	(5,013)	(2,926)
Net	$ 7,174	$ 4,261
Weighted Average Amortization Period (Years)	3 years	3 years 3 months 18 days
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross	$ 11,660	$ 8,860
Accumulated Amortization	(6,547)	(4,951)
Net	$ 5,113	$ 3,909
Weighted Average Amortization Period (Years)	4 years 3 months 18 days	3 years 1 month 6 days
Data Access Rights
Finite Lived Intangible Assets [Line Items]
Gross	$ 10,801	$ 10,801
Accumulated Amortization	(2,666)	(787)
Net	$ 8,135	$ 10,014
Weighted Average Amortization Period (Years)	4 years 3 months 18 days	5 years 3 months 18 days
Media Service Rights
Finite Lived Intangible Assets [Line Items]
Gross	$ 6,383	$ 6,383
Accumulated Amortization	(1,575)	(465)
Net	$ 4,808	$ 5,918
Weighted Average Amortization Period (Years)	4 years 3 months 18 days	5 years 3 months 18 days
Domain Names
Finite Lived Intangible Assets [Line Items]
Gross	$ 5,949	$ 5,948
Accumulated Amortization	(4,689)	(4,070)
Net	$ 1,260	$ 1,878
Weighted Average Amortization Period (Years)	1 year 3 months 18 days	2 years 2 months 12 days
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross	$ 1,767	$ 167
Accumulated Amortization	(401)	(167)
Net	$ 1,366
Weighted Average Amortization Period (Years)	3 years 4 months 24 days
Patents
Finite Lived Intangible Assets [Line Items]
Gross	$ 975	975
Accumulated Amortization	(769)	(718)
Net	$ 206	$ 257
Weighted Average Amortization Period (Years)	4 years 6 months	5 years 7 months 6 days
Vendor Relationships
Finite Lived Intangible Assets [Line Items]
Gross	$ 890	$ 890
Accumulated Amortization	(890)	(667)
Net		$ 223
Weighted Average Amortization Period (Years)		1 year
Registered Users
Finite Lived Intangible Assets [Line Items]
Gross	420	$ 420
Accumulated Amortization	(232)	(129)
Net	$ 188	$ 291
Weighted Average Amortization Period (Years)	2 years 2 months 12 days	3 years 3 months 18 days

Goodwill and Intangible Asset50

Goodwill and Intangible Assets - Estimated Amortization of Intangible Assets (Details) $ in Thousands	Dec. 31, 2017USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2,018	$ 11,467
2,019	10,378
2,020	8,962
2,021	7,104
2,022	4,408
Thereafter	3,818
Total estimated amortization expense	$ 46,137

Debt Obligations - Additional I

Debt Obligations - Additional Information (Details) - 1.75% Convertible Senior Notes Due 2022	1 Months Ended	12 Months Ended
	Nov. 30, 2017USD ($)d$ / sharesshares	Dec. 31, 2017USD ($)
Line Of Credit Facility [Line Items]
Debt instrument aggregate principal amount	$ 200,000,000
Debt instrument maturity year	2,022
Debt instrument fixed interest rate per annum	1.75%
Debt instrument, frequency of payment		Payable semi-annually in arrears on June 1 and December 1 of each year, commencing on June 1, 2018.
Net proceeds from the debt offering, after deducting transaction costs	$ 193,800,000
Convertible notes, shares issued | shares	57.6037
Convertible notes, principal amount	$ 1,000
Convertible notes, initial conversion price | $ / shares	$ 17.36
Convertible notes, type of equity security issued		Common stock
Convertible notes, conversion description		Holders of the notes may convert their notes at their option at any time prior to the close of business on the business day immediately preceding September 1, 2022, only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on March 31, 2018 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five-business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate for the notes on each such trading day; (3) if the Company calls any or all of the notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events. On or after September 1, 2022, holders may convert all or any portion of their notes at any time prior to the close of business on the scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of its common stock or a combination of cash and shares of its common stock, at its election. The Company intends to settle the principal amount of the notes with cash.
Convertible notes, percentage of conversion price	130.00%
Convertible notes, redemption description		The Company may not redeem the notes prior to December 5, 2020. It may redeem for cash all or any portion of the notes, at its option, on or after December 5, 2020 if the last reported sale price of its common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending not more than three trading days preceding the date on which it provides notice of redemption at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.
Convertible notes, redemption percentage	100.00%
Convertible notes, sinking fund	$ 0
Percentage of repurchase price is equal to principal amount of convertible notes	100.00%
Carrying amount of the liability component	$ 149,300,000
Carrying amount of the equity component	$ 50,700,000	$ 49,090,000
Convertible notes, effective interest rate	5.80%
Debt issuance costs	$ 6,200,000
Amortization of interest expense	4,600,000	109,000
Adjustments to additional paid in capital, equity component of debt issuance costs	$ 1,600,000	$ (1,580,000)
90% Applicable Conversion Price
Line Of Credit Facility [Line Items]
Convertible notes, consecutive trading days | d	5
Minimum | 130% Applicable Conversion Price
Line Of Credit Facility [Line Items]
Convertible notes, consecutive trading days | d	20
Maximum
Line Of Credit Facility [Line Items]
Convertible notes, percentage of last reported sale price of common stock	98.00%
Maximum | 130% Applicable Conversion Price
Line Of Credit Facility [Line Items]
Convertible notes, consecutive trading days | d	30

Debt Obligations -Schedule of N

Debt Obligations -Schedule of Net Carrying Amount of Liability Component (Details) - 1.75% Convertible Senior Notes Due 2022 $ in Thousands	Dec. 31, 2017USD ($)
Line Of Credit Facility [Line Items]
Principal	$ 200,000
Unamortized debt discount	(49,631)
Unamortized debt issuance costs	(4,548)
Net carrying amount of the liability component	$ 145,821

Debt Obligations - Schedule of

Debt Obligations - Schedule of Net Carrying Amount of Equity Component (Details) - 1.75% Convertible Senior Notes Due 2022 - USD ($) $ in Thousands	Dec. 31, 2017	Nov. 30, 2017
Line Of Credit Facility [Line Items]
Debt discount related to value of conversion option	$ 50,670
Debt Issuance costs	(1,580)	$ 1,600
Net carrying amount of the equity component	$ 49,090	$ 50,700

Debt Obligations - Interest Exp

Debt Obligations - Interest Expense (Details) - 1.75% Convertible Senior Notes Due 2022 - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2017	Dec. 31, 2017
Line Of Credit Facility [Line Items]
Contractual interest expense		$ 406
Amortization of debt discount		1,039
Amortization of debt issuance costs	$ 4,600	109
Total interest expense related to the Notes		$ 1,554

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 28, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value		$ 6.33	$ 5.14	$ 5.50
RSUs granted		2,517,721	2,855,267	3,673,053
Stock-based compensation		$ 32,252	$ 28,286	$ 32,346
Maximum contribution of base compensation for employee stock purchase plan		15.00%
Offering period of employee stock purchase plan		6 months
Purchase price of common stock percentage of fair market value		85.00%
Issuance of common stock, stock purchase plan, shares		825,848
Shares available for issuance		1,574,152
Stock-based compensation		$ 32,252	$ 28,286	$ 32,346
Property and Equipment
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation		$ 300
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance		1,200,000
Increase in the number of shares available for issuance description		(i) 0.5% of the outstanding shares of common stock on the last day of the immediately preceding year, (ii) 400,000 shares or (iii) such other amount as may be determined by the Board of Directors.
Scenario One | Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of outstanding stock		0.50%
Scenario Two | Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual increases in number of shares available for issuance		400,000
2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance		4,000,000
Percentage of outstanding stock		4.00%
Options expiration period		10 years
2013 Equity Incentive Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted price per share percent		100.00%
PSU Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs granted	128,205
Fair value of the original award	$ 1,600
Stock-based compensation expense due to plan modification	$ 400
Stock-based compensation		$ 200
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs granted		2,517,721	2,855,267	3,673,053
Fair value of options vested, total		$ 6,600	$ 3,700	$ 3,800
Unrecognized stock based compensation, amortized weighted average period		2 years 6 months
Stock Based Compensation Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation		$ 56,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation		$ 11,100
Unrecognized stock based compensation, amortized weighted average period		2 years 6 months
Restricted Stock Units and Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation		$ 44,900
Stock Options and Restricted Stock Units | Former Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense due to plan modification			$ 1,000

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Assumptions Used to Estimate the Fair Value of Stock Options and Employee Stock Purchase Plan (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected life (in years)	6 months	6 months	6 months
Minimum | Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	0.62%	0.38%	0.08%
Volatility	40.00%	50.00%	63.00%
Maximum | Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	1.42%	0.62%	0.33%
Volatility	50.00%	74.00%	72.00%
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, minimum	1.87%	0.68%	1.67%
Risk-free interest rate, maximum	2.14%	1.34%	1.89%
Volatility	50.00%
Volatility, minimum		55.00%	55.00%
Volatility, maximum		70.00%	60.00%
Stock Options | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected life (in years)	5 years 6 months	2 years 3 months 18 days	5 years 6 months
Stock Options | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected life (in years)	6 years 3 months	6 years 29 days	6 years 29 days

Stock-Based Compensation - Su57

Stock-Based Compensation - Summary of Stock Option and Restricted Stock Units Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares Available for Grant
Beginning balance	3,424,730	2,889,301	1,825,112
Increase in shares authorized	3,542,416	3,279,811	3,255,200
Options granted	(1,319,680)	(2,197,432)	(328,680)
Options canceled or expired	218,035	592,834	121,593
RSUs and PSUs granted	(2,517,721)	(2,855,267)	(3,673,053)
RSUs canceled or expired	787,009	1,715,483	1,689,129
RSUs withheld for taxes	290,366
Ending balance	4,425,155	3,424,730	2,889,301	1,825,112
Number of Shares
Beginning balance	7,746,067	8,469,666	9,494,763
Options granted	1,319,680	2,197,432	328,680
Options exercised	(1,435,484)	(2,328,197)	(1,232,184)
Options canceled or expired	(218,035)	(592,834)	(121,593)
Ending balance	7,412,228	7,746,067	8,469,666	9,494,763
Vested and exercisable at the end of period	5,345,298
Weighted Average Exercise Price
Beginning balance	$ 8.83	$ 7.62	$ 7
Options granted	12.76	8.99	10.05
Options exercised	4.32	4.54	3.31
Options canceled or expired	10.34	8.97	9.35
Ending balance	10.36	$ 8.83	$ 7.62	$ 7
Vested and exercisable at the end of period	$ 10.02
Weighted Average Remaining Contractual Term (Years) / Aggregate Intrinsic Value
Weighted Average Remaining Contractual Term (Years)	6 years 1 month 2 days	6 years 1 month 13 days	5 years 10 months 28 days	6 years 6 months 25 days
Vested and exercisable at the end of period	5 years 29 days
Aggregate Intrinsic Value, Beginning balance	$ 30,507	$ 19,231	$ 107,913
Aggregate Intrinsic Value, Options exercised	10,768	15,485	10,246
Aggregate Intrinsic Value, Ending balance	25,415	$ 30,507	$ 19,231	$ 107,913
Vested and exercisable at the end of period	$ 22,891
Restricted Stock Units, Number of Shares
RSUs and PSUs granted	2,517,721	2,855,267	3,673,053
RSUs canceled or expired	(787,009)	(1,715,483)	(1,689,129)
Restricted Stock Units
Shares Available for Grant
RSUs and PSUs granted	(2,517,721)	(2,855,267)	(3,673,053)
RSUs canceled or expired	787,009	1,715,483	1,689,129
Restricted Stock Units, Number of Shares
Beginning balance	5,504,084	6,786,446	6,809,415
RSUs and PSUs granted	2,517,721	2,855,267	3,673,053
RSUs released	(2,040,504)	(2,422,146)	(2,006,893)
RSUs canceled or expired	(787,009)	(1,715,483)	(1,689,129)
Ending balance	5,194,292	5,504,084	6,786,446	6,809,415
Weighted Average Grant Date Fair Value
Beginning Balance	$ 12.02	$ 13.14	$ 12.66
RSUs and PSUs granted	12.04	10.37	12.43
RSUs released	12.20	11.92	11.64
RSUs canceled or expired	11.47	11.81	12.80
Ending balance	$ 12.26	$ 12.02	$ 13.14	$ 12.66

Stock-Based Compensation - Bala

Stock-Based Compensation - Balance of Outstanding and Exercisable Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Number of Shares	7,412,228	7,746,067	8,469,666	9,494,763
Options Exercisable, Number of Shares	5,345,298
Exercise Prices 0.15 - 5.33
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Price Range, Minimum	$ 0.15
Price Range, Maximum	$ 5.33
Options Outstanding, Number of Shares	1,810,210
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	2 years 8 months 8 days
Options Outstanding, Weighted Average Exercise Price	$ 2.47
Options Exercisable, Number of Shares	1,810,210
Options Exercisable, Weighted Average Exercise Price	$ 2.47
Exercise Prices 5.48 - 8.51
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Price Range, Minimum	5.48
Price Range, Maximum	$ 8.51
Options Outstanding, Number of Shares	1,554,928
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	7 years 11 months 19 days
Options Outstanding, Weighted Average Exercise Price	$ 8.31
Options Exercisable, Number of Shares	793,126
Options Exercisable, Weighted Average Exercise Price	$ 8.13
Exercise Prices 8.65 - 13.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Price Range, Minimum	8.65
Price Range, Maximum	$ 13
Options Outstanding, Number of Shares	2,392,355
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	7 years 5 months 4 days
Options Outstanding, Weighted Average Exercise Price	$ 10.94
Options Exercisable, Number of Shares	1,224,054
Options Exercisable, Weighted Average Exercise Price	$ 9.17
Exercise Prices 13.04 - 16.25
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Price Range, Minimum	13.04
Price Range, Maximum	$ 16.25
Options Outstanding, Number of Shares	854,735
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	6 years 4 months 13 days
Options Outstanding, Weighted Average Exercise Price	$ 15.46
Options Exercisable, Number of Shares	717,908
Options Exercisable, Weighted Average Exercise Price	$ 15.88
Exercise Prices 25.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Price Range	$ 25
Options Outstanding, Number of Shares	800,000
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	5 years 10 months 13 days
Options Outstanding, Weighted Average Exercise Price	$ 25
Options Exercisable, Number of Shares	800,000
Options Exercisable, Weighted Average Exercise Price	$ 25

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	$ 32,252	$ 28,286	$ 32,346
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	2,000	1,821	1,728
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	6,621	5,776	10,658
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	7,949	7,286	9,680
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	$ 15,682	$ 13,403	$ 10,280

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2017USD ($)	Dec. 31, 2017USD ($)shares	Dec. 31, 2017USD ($)VoteClassshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)	Mar. 31, 2014shares
Class Of Stock [Line Items]
Common stock, shares authorized | shares		250,000,000	250,000,000	250,000,000		250,000,000
Preferred stock, shares authorized | shares		10,000,000	10,000,000	10,000,000		10,000,000
Number of votes per common stock | Vote			1
Number of classes of Board of Directors | Class			3
Board of Directors term			3 years
Board of Directors classes subject to election each year | Class			1
Common stock, voting rights			Amendment. The amendment of the provisions in the restated certificate requires approval by holders of at least 66 2/3% of the Company’s outstanding capital stock entitled to vote generally in the election of directors.
Aggregate cost of shares repurchased | $				$ 11,147,000	$ 23,492,000
Retirement of treasury stock | shares		9,647,708
Share Repurchase Program ("2017 Program")
Class Of Stock [Line Items]
Stock repurchase program duration	1 year
Share repurchase program, beginning date	May 5, 2017
Number of shares repurchased | shares			0	3,095,189
Aggregate cost of shares repurchased | $				$ 23,500,000
Remaining amount available for future share repurchases | $		$ 50,000,000	$ 50,000,000
Share Repurchase Program ("2017 Program") | Maximum
Class Of Stock [Line Items]
Repurchase of authorized common stock | $	$ 50,000,000

Income Taxes - Components of Lo

Income Taxes - Components of Loss Before Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 12,770	$ 18,041	$ 25,385
Foreign	3,009	1,197	1,906
Total	$ 15,779	$ 19,238	$ 27,291

Income Taxes - Components of Pr

Income Taxes - Components of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal			$ 43
State		$ 4	8	$ 2
Foreign		173	84	91
Total current income tax expense (benefit)		177	135	93
Deferred:
Federal		(673)	142	(317)
State		84	14	(23)
Foreign		(290)	(50)	(314)
Total deferred income tax expense (benefit)		(879)	106	(654)
Total	$ (700)	$ (702)	$ 241	$ (561)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Statutory Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax	(34.00%)	(34.00%)	(34.00%)
State income tax, net of federal tax benefit	0.56%	0.11%	(0.08%)
Tax credits	(8.29%)	(8.14%)	(4.60%)
Stock-based compensation	(0.54%)	1.52%	0.67%
Foreign income taxes at other than U.S. rates	5.74%	2.29%	1.56%
Acquisition related costs	1.66%		0.76%
Contingent consideration related to acquisitions	12.28%	(9.04%)
Other	2.93%	2.77%	0.41%
IRS Settlement		(12.42%)
Tax Cuts and Jobs Act	175.93%
Valuation allowance, net	(160.72%)	58.16%	33.22%
Effective tax rate	(4.45%)	1.25%	(2.06%)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
Federal corporate tax rate			34.00%	34.00%	34.00%
Provision for (benefit from) income taxes	$ (700,000)		$ (702,000)	$ 241,000	$ (561,000)
Income tax reconciliation, re-measurement of deferred tax assets and liabilities			27,700,000
Provisional valuation allowance			28,400,000
Additional income taxes for remaining undistributed foreign earnings not subject to transition tax			$ 0
Income tax holiday expiration period			Apr. 1, 2020
Deferred tax assets	100,900,000		$ 100,900,000	93,800,000
Deferred tax liabilities	17,965,000		17,965,000	9,160,000
Decrease (increase) in valuation allowance			2,600,000	1,400,000
Operating loss carryforwards expired			7,400,000
Income tax penalties and interest accrued	0		0	$ 0
Federal
Income Tax Disclosure [Line Items]
Operating loss carryforwards	271,400,000		$ 271,400,000
Operating loss carryforwards expiration year			2,018
Federal | Research
Income Tax Disclosure [Line Items]
Tax credit carryforwards	12,900,000		$ 12,900,000
Tax credit carryforwards expiration year			2,032
State
Income Tax Disclosure [Line Items]
Operating loss carryforwards	187,100,000		$ 187,100,000
Operating loss carryforwards expiration year			2,017
State | Research
Income Tax Disclosure [Line Items]
Tax credit carryforwards	14,900,000		$ 14,900,000
Foreign
Income Tax Disclosure [Line Items]
Operating loss carryforwards	11,700,000		$ 11,700,000
Operating loss carryforwards expiration year			2,017
Retained Earnings | ASU 2016-09
Income Tax Disclosure [Line Items]
Unrecognized excess tax benefits as deferred tax assets, cumulative-effect adjustment to opening retained earnings	$ 25,500,000		$ 25,500,000
Earliest Tax Holiday Year
Income Tax Disclosure [Line Items]
Income tax wholly exempted period			Apr. 1, 2014
Income tax partially exempted period			Apr. 1, 2019
Latest Tax Holiday Year
Income Tax Disclosure [Line Items]
Income tax wholly exempted period			Mar. 31, 2019
Income tax partially exempted period			Mar. 31, 2024
Tax Year 2014 | Internal Revenue Service (IRS)
Income Tax Disclosure [Line Items]
Internal revenue service settlement			$ 0
Scenario Forecast
Income Tax Disclosure [Line Items]
Federal corporate tax rate		21.00%

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Credits and net operating loss carryforward	$ 90,729	$ 78,813
Accrued compensation, assets		2,771
Accrued compensation, liabilities	(31)
Deferred revenues	54	112
Stock-based compensation	7,416	9,910
Property and equipment, assets	1,231
Property and equipment, liabilities		(898)
Other deferred tax assets	1,495	3,073
Total deferred tax assets	100,894	93,781
Valuation allowance	(84,619)	(87,190)
Deferred tax liabilities:
Basis difference on purchased intangible assets	6,559	9,160
Other deferred tax liabilities	11,406
Total deferred tax liabilities	17,965	9,160
Net deferred tax assets (liabilities)	$ (1,690)	$ (2,569)

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits and Effect on Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefit - beginning balance	$ 6,447	$ 8,759	$ 1,366
Increases for tax positions taken in prior years	16	313	5,611
Decreases for tax positions taken in prior years		(785)
Increases for tax positions taken in current year	1,064	1,163	1,782
Settlements		(3,003)
Unrecognized tax benefit - ending balance	$ 7,527	$ 6,447	$ 8,759

Net Income (Loss) per Share - S

Net Income (Loss) per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net loss	$ (15,077)	$ (19,479)	$ (26,730)
Weighted-average number of shares used to compute net loss per share, basic and diluted	89,505	84,157	82,807
Net loss per share, basic and diluted	$ (0.17)	$ (0.23)	$ (0.32)

Net Income (Loss) per Share -68

Net Income (Loss) per Share - Schedule of Outstanding Common Equivalent Shares Excluded from Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding common equivalent shares	25,180	15,358	15,361
Stock Options and ESPP
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding common equivalent shares	7,465	7,854	8,575
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding common equivalent shares	5,194	5,504	6,786
Shares Held in Escrow
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding common equivalent shares	1,000	2,000
Shares Related to Convertible Senior Notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding common equivalent shares	11,521

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies [Line Items]
Rent expense			$ 4,300,000	$ 4,400,000	$ 3,100,000
Restructuring charge related to facility exit costs		$ 2,100,000	2,074,000
Restructuring accrual balance		1,900,000	$ 1,900,000
Computer Equipment | Promissory Note
Commitments And Contingencies [Line Items]
Debt instrument, used to finance	$ 800,000
Debt instrument, frequency of payment			quarterly
Debt instrument, maturity period	3 years
Debt instrument, remaining amount		600,000	$ 600,000
Open Purchase Commitments
Commitments And Contingencies [Line Items]
Software license fees and marketing services			7,700,000
Marketing Arrangements
Commitments And Contingencies [Line Items]
Unconditional purchase commitments		$ 6,500,000	$ 6,500,000
Unconditional purchase commitment year			2,034
Unconditional purchase commitment term			20 years
Minimum
Commitments And Contingencies [Line Items]
Term of non-cancelable operating lease			1 year
Maximum
Commitments And Contingencies [Line Items]
Term of non-cancelable operating lease			7 years

Commitments and Contingencies70

Commitments and Contingencies - Minimum Payments Under Non-cancelable Operating and Capital Leases (Details) $ in Thousands	Dec. 31, 2017USD ($)
Operating Leases
2,018	$ 4,691
2,019	4,358
2,020	2,140
2,021	807
2,022	827
2023 and thereafter	1,330
Total minimum payments	14,153
Capital Leases
2,018	48
2,019	13
Total minimum payments	61
Less: Amount representing interest	2
Present value of capital lease obligations	59
Less: Current portion	47
Capital lease obligation, net of current portion	$ 12

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Pension And Other Postretirement Plans Disclosure [Abstract]
Rate at which the company matches employee contribution	3.00%
Maximum contribution amount	$ 6,000
Defined contribution vesting period	4 years
Matching contribution expense	$ 1,600,000	$ 1,700,000	$ 1,600,000

Concentrations - Additional Inf

Concentrations - Additional Information (Details) - Customer Concentration Risk - Customer	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable
Concentration Risk [Line Items]
Number of customers accounted greater than 10% concentration risk	0	1
Revenues
Concentration Risk [Line Items]
Number of customers accounted greater than 10% concentration risk	0	1	1