Magnite (MGNI) 10-Q 5 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 25, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	RUBICON PROJECT, INC.
Entity Central Index Key	1,595,974
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		49,551,923

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 149,367	$ 149,423
Marketable securities	38,604	40,550
Accounts receivable, net	133,575	192,064
Prepaid expenses and other current assets	11,516	9,540
TOTAL CURRENT ASSETS	333,062	391,577
Property and equipment, net	33,208	36,246
Internal use software development costs, net	14,929	16,522
Other assets, non-current	2,129	2,921
Intangible assets, net	5,219	6,804
Goodwill	65,705	65,705
TOTAL ASSETS	454,252	519,775
Current liabilities:
Accounts payable and accrued expenses	158,837	214,903
Other current liabilities	3,156	3,534
TOTAL CURRENT LIABILITIES	161,993	218,437
Deferred tax liability, net	42	42
Other liabilities, non-current	1,678	1,783
TOTAL LIABILITIES	163,713	220,262
Commitments and contingencies (Note 9)
STOCKHOLDERS' EQUITY
Preferred stock, $0.00001 par value, 10,000 shares authorized at March 31, 2017 and December 31, 2016; 0 shares issued and outstanding at March 31, 2017 and December 31, 2016	0	0
Common stock, $0.00001 par value; 500,000 shares authorized at March 31, 2017 and December 31, 2016; 49,547 and 49,378 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	0	0
Additional paid-in capital	405,560	398,787
Accumulated other comprehensive loss	(180)	(273)
Accumulated deficit	(114,841)	(99,001)
TOTAL STOCKHOLDERS' EQUITY	290,539	299,513
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 454,252	$ 519,775

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common stock, par or stated value per share	$ 0.00001	$ 0.00001	$ 0.00001	$ 0.00001
Common stock, shares authorized	500,000,000	500,000,000	500,000,000	500,000,000
Common stock, shares, issued	49,547,000	49,378,000	46,600,000	37,192,000
Common stock, shares, outstanding	49,547,000	49,378,000	46,600,000	37,192,000
Preferred Stock
Preferred stock, par or stated value per share	$ 0.00001	$ 0.00001	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0	0	0
Preferred Stock, Shares Outstanding	0	0	0	0

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 46,015	$ 69,232
Expenses:
Cost of revenue	14,688	16,783
Sales and marketing	14,628	21,278
Technology and development	12,753	12,443
General and administrative	15,080	20,605
Restructuring and other exit costs	4,338	0
Total expenses	61,487	71,109
Loss from operations	(15,472)	(1,877)
Other (income) expense:
Interest income, net	(167)	(94)
Other income	212	0
Foreign exchange loss, net	372	261
Total other (income) expense, net	(7)	167
Loss before income taxes	(15,465)	(2,044)
Provision (benefit) for income taxes	375	(4,328)
Net income (loss)	$ (15,840)	$ 2,284
Net income (loss) per share:
Basic (usd per share)	$ (0.33)	$ 0.05
Diluted (usd per share)	$ (0.33)	$ 0.05
Net income (loss) per share:
Basic (in shares)	48,332	44,663
Diluted (in shares)	48,332	48,676

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (15,840)	$ 2,284
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of tax of $0 for the three months ended March 31, 2017 and 2016	(4)	64
Foreign currency translation adjustments	97	27
Other comprehensive income	93	91
Comprehensive income (loss)	$ (15,747)	$ 2,375

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Loss) - Parenthetical - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on investments, net of tax	$ 0	$ 0

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)	$ (99,001)				$ (99,001)
Additional Paid in Capital	$ 398,787		$ 398,787
Beginning Balance (in shares) at Dec. 31, 2016	49,378	49,378
Beginning Balance at Dec. 31, 2016	$ 299,513	$ 0		$ (273)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options (in shares)		94
Exercise of common stock options	368		368
Shares Paid for Tax Withholding for Share Based Compensation		(43)
Issuance of common stock related to RSU vesting (in shares)		118
Stock-based compensation	6,405		6,405
Other comprehensive loss	93			93
Net income (loss)	$ (15,840)				(15,840)
Ending Balance (in shares) at Mar. 31, 2017	49,547	49,547
Ending Balance at Mar. 31, 2017	$ 290,539	$ 0	$ 405,560	$ (180)	$ (114,841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)	(114,841)
Additional Paid in Capital	$ 405,560

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES:
Net income (loss)	$ (15,840)	$ 2,284
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	10,121	8,626
Stock-based compensation	6,239	8,391
Loss on disposal of property and equipment	258	3
Unrealized foreign currency gains, net	119	972
Deferred income taxes	282	(4,351)
Changes in operating assets and liabilities, net of effect of business acquisitions:
Accounts receivable	58,501	59,303
Prepaid expenses and other assets	(1,506)	179
Accounts payable and accrued expenses	(54,794)	(64,180)
Other liabilities	(499)	(559)
Net cash provided by operating activities	2,881	10,668
INVESTING ACTIVITIES:
Purchases of property and equipment	(3,084)	(1,443)
Capitalized internal use software development costs	(2,285)	(2,306)
Investments in available-for-sale securities	(14,948)	0
Maturities of available-for-sale securities	16,950	6,400
Net cash provided by (used in) investing activities	(3,367)	2,651
FINANCING ACTIVITIES:
Proceeds from exercise of stock options	368	6,718
Net cash provided by financing activities	368	6,718
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	62	31
CHANGE IN CASH AND CASH EQUIVALENTS	(56)	20,068
CASH AND CASH EQUIVALENTS — Beginning of period	149,423	116,499
CASH AND CASH EQUIVALENTS — End of period	149,367	136,567
SUPPLEMENTAL DISCLOSURES OF OTHER CASH FLOW INFORMATION:
Capitalized assets financed by accounts payable and accrued expenses	254	667
Capitalized stock-based compensation	$ 166	$ 206

Organization and Summary of Sig

Organization and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Summary of Significant Accounting Policies Company Overview The Rubicon Project, Inc., or Rubicon Project or the Company, was formed on April 20, 2007 in Delaware and began operations in April 2007. The Company is headquartered in Los Angeles, California. The Company is a technology company with a mission to keep the Internet free and open and to fuel its growth by making it easy and safe to buy and sell advertising. The Company pioneered advertising automation technology and offers a highly scalable platform to enable the world's leading brands, content creators, and application developers to execute billions of digital advertising transactions each month, protect their brands and properties and improve the advertising experience of consumers. The Company delivers value to buyers and sellers of digital advertising through the Company’s proprietary advertising automation solution, which provides critical functionality to both buyers and sellers. The advertising automation solution consists of applications for sellers, including providers of websites, mobile applications and other digital media properties, and their representatives, to sell their advertising inventory; applications for buyers, including advertisers, agencies, agency trading desks, demand side platforms, and ad networks, to buy advertising inventory; and a marketplace over which such transactions are executed. This solution incorporates proprietary machine-learning algorithms, sophisticated data processing, high-volume storage, detailed analytics capabilities, and a distributed infrastructure. Together, these features form the basis for the Company’s automated advertising solution that brings buyers and sellers together and facilitates intelligent decision-making and automated transaction execution for the advertising inventory managed on the Company's platform. Basis of Presentation and Summary of Significant Accounting Policies The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States Generally Accepted Accounting Principles, or GAAP, for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the results for the interim period presented have been included. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for any future interim period, the year ending December 31, 2017 , or for any future year. The condensed consolidated balance sheet at December 31, 2016 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto for the year ended December 31, 2016 included in its Annual Report on Form 10-K. There have been no significant changes in the Company's accounting policies from those disclosed in its audited consolidated financial statements and notes thereto for the year ended December 31, 2016 included in its Annual Report on Form 10-K. Revenue Recognition The Company generates revenue from buyers and sellers who use its solution for the purchase and sale of advertising inventory. The Company's solution enables buyers and sellers to purchase and sell advertising inventory by matching buyers and sellers, and by establishing rules and parameters for open and transparent auctions of advertising inventory. Buyers use the Company's solution to reach their intended audiences by buying advertising inventory that the Company makes available from sellers through its solution. Sellers use the Company's solution to monetize their inventory. The Company recognizes revenue upon fulfillment of its contractual obligations in connection with a completed transaction, subject to satisfying all other revenue recognition criteria, including (i) persuasive evidence of an arrangement existing, (ii) delivery having occurred or services having been rendered, (iii) the fees being fixed or determinable, and (iv) collectability being reasonably assured. The Company generally bills and collects the full purchase price of impressions from buyers, together with other fees, if applicable. The Company reports revenue on a net basis for arrangements in which it has determined that it does not act as the principal in the purchase and sale of advertising inventory because pricing is determined through the Company's auction process or directly between a buyer and a seller and the Company is not the primary obligor. In some cases, the Company generates revenue directly from sellers who maintain the primary relationship with buyers and utilize the Company's solution to transact and increase the monetization of their activities. The Company reports revenue on a net basis for these activities. The Company reports revenue on a gross basis for arrangements in which it has determined that the Company acts as the principal in the purchase and sale of advertising inventory because the Company has direct contractual relationships with and manages advertising campaigns on behalf of the buyer by acting as the primary obligor in the purchase of advertising inventory, the Company exercises discretion in establishing prices, the Company has credit risk, and the Company independently selects and purchases inventory from the seller. The Company's accounts receivable are recorded at the amount of gross billings to buyers, net of allowances, for the amounts the Company is responsible to collect, and the Company's accounts payable related to amounts due to sellers are recorded at the net amount payable to sellers. Accordingly, both accounts receivable and accounts payable appear large in relation to revenue reported on a net basis. Goodwill Goodwill represents the excess of the aggregate fair value of the consideration transferred in a business combination over the fair value of the assets acquired, net of liabilities assumed. Goodwill is not amortized, but is subject to an annual impairment test. The Company tests for impairment of goodwill annually during the fourth quarter or more frequently if events or changes in circumstances indicate that goodwill may be impaired. For purposes of goodwill impairment testing, the Company operates as a single operating segment and has identified a single reporting unit. Events or changes in circumstances which could trigger an impairment review include a significant adverse change in legal factors or in the business climate, an adverse action or assessment by a regulator, unanticipated competition, a loss of key personnel, significant changes in the manner of the Company’s use of the acquired assets or the strategy for the Company’s overall business, significant negative industry or economic trends, or significant under performance relative to expected historical or projected future results of operations. In January 2017, the FASB issued new guidance intended to simplify the test for goodwill impairment, which the Company adopted during the three month period ended March 31, 2017. Testing goodwill for impairment involves a quantitative analysis whereby the estimated fair value of the reporting unit is compared with its respective carrying amount, including goodwill. However, prior to performing this quantitative goodwill impairment test, the Company has the option to first assess qualitative factors to determine whether or not it is necessary to perform the quantitative goodwill impairment test. If the Company chooses the qualitative option, the Company is not required to perform the quantitative goodwill impairment test unless it has determined, based on the qualitative assessment, that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the quantitative impairment test is required or chosen, the impairment test involves comparing the estimated fair value of the reporting unit with its respective carrying amount, including goodwill. If the estimated fair value of the reporting unit exceeds its carrying amount, including goodwill, goodwill is considered not to be impaired and no additional steps are necessary. The Company recently experienced a drop in the trading price of its common stock. As a result the Company's public market capitalization, calculated by multiplying the share price by outstanding shares, is near or slightly lower than the carrying value of its net assets. The Company considered this an indicator triggering the need to assess the carrying value of goodwill for potential impairment at March 31, 2017. As a result, the Company performed a quantitative goodwill impairment assessment. The Company considered multiple factors including, amongst others, its current business condition, product and business plans, market perceptions, valuation considerations, and the timing of these factors. As a result, the Company determined that no impairment of goodwill was indicated at March 31, 2017. Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed financial statements and accompanying footnotes. Actual results could differ materially from these estimates. Recent Accounting Pronouncements Under the Jumpstart Our Business Startups Act, or the JOBS Act, the Company meets the definition of an emerging growth company. The Company has irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. In May 2014, the Financial Accounting Standards Board, or FASB, issued new accounting guidance that amends the guidance for revenue recognition to replace numerous industry-specific requirements and converges areas under the "Revenue from Contracts with Customers" topic with those of the International Financial Reporting Standards. The guidance implements a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. Other major provisions include the capitalization and amortization of certain contract costs, ensuring the time value of money is considered in the transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. These amendments were effective for reporting periods beginning after December 15, 2016, with early adoption prohibited. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. Subsequent to issuing the May 2014 guidance, in August 2015, the FASB issued amendments that deferred the effective date one year. As a result, the guidance is effective for reporting periods beginning after December 15, 2017, with early adoption permitted only as of annual reporting periods beginning after December 15, 2016. Since its issuance, the FASB has amended several aspects of the new guidance including provisions that clarify the implementation guidance on principal versus agent considerations in the new revenue recognition standard. The amendments clarify how an entity should identify the unit of accounting (i.e. the specified good or service) for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements. The Company has not yet selected a transition method, but is currently evaluating the new principle versus agent guidance with respect to its revenue arrangements and assessing the impact this guidance will have on the Company's condensed consolidated financial statements. In January 2016, the FASB issued new accounting guidance that changes certain recognition, measurement, presentation, and disclosure requirements for financial instruments. The new guidance requires all equity investments, except those accounted for under the equity method of accounting or resulting in consolidation, to be measured at fair value with changes in fair value recognized in net income. The guidance also simplifies the impairment assessment for equity investments without readily determinable fair values, amends the presentation requirements for changes in the fair value of financial liabilities, requires presentation of financial instruments by measurement category and form of financial asset, and eliminates the requirement to disclose the methods and significant assumptions used in estimating the fair value of financial instruments. The new guidance is effective for interim and annual periods beginning after December 15, 2017, and early adoption is not permitted except for the amended presentation requirements for changes in the fair value of financial liabilities. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In February 2016, the FASB issued new accounting guidance that requires an entity to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. This guidance offers specific accounting guidance for a lessee, a lessor, and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. This guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and requires a modified retrospective adoption, with early adoption permitted. Although the Company is currently evaluating the effect this guidance will have on its condensed consolidated financial statements and related disclosures, the Company anticipates the guidance to have an impact on its assets and liabilities, as most of its operating lease commitments will be subject to the new standard and recognized as right-of-use assets and lease liabilities. In June 2016, the FASB issued new guidance that changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The new guidance will be effective for the Company starting in the first quarter of fiscal 2021. Early adoption is permitted starting in the first quarter of fiscal 2020. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In August 2016, the FASB issued new guidance intended to reduce diversity in practice in how certain cash receipts and payments are classified in the statement of cash flows, including debt prepayment or extinguishment costs, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, and distributions from certain equity method investees. The new guidance will be effective for interim and annual periods beginning after December 15, 2017, and early adoption is permitted. The guidance requires application using a retrospective transition method. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In October 2016, the FASB issued new guidance intended to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Under the new guidance, entities should recognize the income tax consequences of such transfers when the transfers occur. The new guidance will be effective for interim and annual periods beginning after December 15, 2017, and early adoption is permitted. The guidance requires application using a modified retrospective transition method. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In January 2017, the FASB issued amended guidance for business combinations. The new pronouncement changes the definition of a business with the objective of adding guidance to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, and will be applied prospectively to any transactions occurring within the period of adoption. Early adoption is permitted, including for interim or annual periods in which the financial statements have not been issued or made available for issuance. Subsequent to adoption, the Company will apply this guidance to acquisitions or disposals occurring in the period of adoption and thereafter.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income (Loss) Per Share The following table presents the basic and diluted net income (loss) per share attributable to common stockholders: Three Months Ended March 31, 2017 March 31, 2016 (In thousands, except per share data) Basic EPS: Net income (loss) attributable to common stockholders $ (15,840 ) $ 2,284 Weighted-average common shares outstanding 49,446 47,137 Weighted-average unvested restricted shares (1,114 ) (1,700 ) Weighted-average escrow shares — (774 ) Weighted-average common shares outstanding used to compute net income (loss) per share 48,332 44,663 Basic net income (loss) per share $ (0.33 ) $ 0.05 Diluted EPS: Net income (loss) $ (15,840 ) $ 2,284 Weighted-average common shares used in basic EPS 48,332 44,663 Dilutive effect of weighted-average common stock options — 1,722 Dilutive effect of weighted-average restricted stock awards — 613 Dilutive effect of weighted-average restricted stock units — 897 Dilutive effect of weighted-average ESPP — 18 Dilutive effect of weighted-average escrow shares — 763 Weighted-average shares used to compute diluted net income (loss) per share 48,332 48,676 Diluted net income (loss) per share $ (0.33 ) $ 0.05 The following weighted-average shares have been excluded from the calculation of diluted net income (loss) per share attributable to common stockholders for each period presented because they are anti-dilutive: March 31, 2017 March 31, 2016 (in thousands) Options to purchase common stock 186 — Unvested restricted stock awards 224 — Unvested restricted stock units 661 — ESPP 58 — Total shares excluded from net income (loss) per share 1,129 —

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value represents the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Observable inputs are based on market data obtained from independent sources. The fair value hierarchy is based on the following three levels of inputs, of which the first two are considered observable and the last one is considered unobservable: • Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. • Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. • Level 3 – Unobservable inputs. The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at March 31, 2017 : Total Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Other Significant (in thousands) Cash equivalents $ 17,807 $ 10,111 $ 7,696 $ — Corporate debt securities $ 20,354 $ — $ 20,354 $ — U.S. Treasury, government and agency debt securities $ 18,250 $ 18,250 $ — $ — The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at December 31, 2016 : Total Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Other Significant (in thousands) Cash equivalents $ 15,776 $ 7,781 $ 7,995 $ — Corporate debt securities $ 17,314 $ — $ 17,314 $ — U.S. Treasury, government and agency debt securities $ 23,236 $ 23,236 $ — $ — At March 31, 2017 and December 31, 2016 , cash equivalents of $17.8 million and $15.8 million , respectively, consisted of money market funds, commercial paper, treasury and agency debt securities with original maturities of three months or less. The carrying amounts of cash equivalents are classified as Level 1 or Level 2 depending on whether or not their fair values are based on quoted market prices for identical securities that are traded in an active market. The commercial paper included in cash equivalents is classified as Level 2 since its fair value is not based on quoted market prices for identical securities that are traded in an active market, but rather is derived from similar securities. Corporate debt securities included in marketable securities on the balance sheet whose fair values are not based on quoted market prices for identical securities that are traded in an active market, rather derived from similar securities, are classified as Level 2 as well. The fair values of the Company's U.S. treasury, government and agency debt securities, are based on quoted market prices and classified as Level 1.

Other Balance Sheet Amounts

Other Balance Sheet Amounts	3 Months Ended
	Mar. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Other Balance Sheet Amounts	Other Balance Sheet Amounts Investments in marketable securities as of March 31, 2017 consisted of the following: Amortized Gross Gross Fair (in thousands) Available-for-sale — short-term: U.S. Treasury, government and agency debt securities $ 18,255 $ — $ (5 ) $ 18,250 Corporate debt securities 20,354 — — 20,354 Total $ 38,609 $ — $ (5 ) $ 38,604 As of March 31, 2017 and December 31, 2016 , the Company's available-for-sale securities had a weighted remaining contractual maturity of 0.2 years and 0.3 years , respectively. For the three months ended March 31, 2017 , there were no realized gains (losses) and there were no unrealized holding gains (losses) reclassified out of accumulated other comprehensive income (loss) into the condensed consolidated statements of operations for the sale of available-for-sale investments. Investments in marketable securities as of December 31, 2016 consisted of the following: Amortized Gross Gross Fair (in thousands) Available-for-sale — short-term: U.S. Treasury, government and agency debt securities $ 23,237 $ 1 $ (2 ) $ 23,236 Corporate debt securities 17,314 — — 17,314 Total $ 40,551 $ 1 $ (2 ) $ 40,550 The amortized cost and fair value of the Company's marketable securities at March 31, 2017 , by contractual years-to-maturity are as follows: Amortized Cost Fair Value (in thousands) Due in less than 1 year $ 38,609 $ 38,604 Due within 1-2 years — — Total $ 38,609 $ 38,604 Accounts payable and accrued expenses included the following: March 31, 2017 December 31, 2016 (in thousands) Accounts payable—seller $ 142,822 $ 197,261 Accounts payable—trade 5,251 7,930 Accrued employee-related payables 10,764 9,712 Total $ 158,837 $ 214,903

Intangible Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets Details of the Company’s intangible assets were as follows: March 31, 2017 December 31, 2016 (in thousands) Amortizable intangible assets: Developed technology $ 13,418 $ 13,418 Customer relationships 3,330 3,330 Non-compete agreements 490 4,990 Total identifiable intangible assets, gross 17,238 21,738 Accumulated amortization— intangible assets: Developed technology (8,384 ) (7,652 ) Customer relationships (3,170 ) (2,837 ) Non-compete agreements (465 ) (4,445 ) Total accumulated amortization—intangible assets (12,019 ) (14,934 ) Total identifiable intangible assets, net $ 5,219 $ 6,804 Amortization of intangible assets for the three months ended March 31, 2017 was $1.6 million . In January 2017, the Company announced that it would cease providing intent marketing services. In connection with this decision, the Company assessed the asset group related to the intent marketing services, which consisted of customer relationships and developed technology related to the Chango acquisition, and determined that the asset group was impaired. Accordingly, the Company recorded a charge for the impairment of intangible assets totaling $23.5 million , which is included in the consolidated statement of operations for the year ended December 31, 2016 . The estimated remaining amortization expense associated with the Company's intangible assets was as follows as of March 31, 2017 : Fiscal Year Amount (in thousands) 2017 1,717 2018 1,862 2019 1,640 Total $ 5,219

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company’s equity incentive plans provide for the grant of equity awards, including non-statutory or incentive stock options, restricted stock, and restricted stock units, to the Company's employees, officers, directors, and consultants. The Company's board of directors administers the plans. Options outstanding vest based upon continued service at varying rates, but generally over four years from issuance with 25% vesting after one year of service and the remainder vesting monthly thereafter. Restricted stock and restricted stock units vest at varying rates, usually approximately 25% vesting after approximately one year of service and the remainder vesting semi-annually thereafter. Options, restricted stock, and restricted stock units granted under the plans accelerate under certain circumstances on a change in control, as defined in the governing plan. An aggregate of 4,645,881 shares remained available for issuance at March 31, 2017 under the plans. Stock Options A summary of stock option activity for the three months ended March 31, 2017 is as follows: Shares Under Option Weighted- Average Exercise Price Weighted- Average Contractual Life Aggregate Intrinsic Value (in thousands) (in thousands) Outstanding at December 31, 2016 3,861 $ 11.16 Granted 902 $ 5.86 Exercised (94 ) $ 3.90 Canceled (195 ) $ 12.50 Outstanding at March 31, 2017 4,474 $ 10.19 6.84 years $ 704 Exercisable at March 31, 2017 2,717 $ 10.38 5.64 years $ 642 The total intrinsic value of options exercised for the three months ended March 31, 2017 was $0.4 million . At March 31, 2017 , the Company had unrecognized employee stock-based compensation expense relating to stock options of approximately $6.1 million , which is expected to be recognized over a weighted-average period of 2.6 years . The weighted-average grant date per share fair value of stock options granted for the three months ended March 31, 2017 was $3.11 . The Company estimates the fair value of stock options that contain service and/or performance conditions using the Black-Scholes option pricing model. The weighted-average input assumptions used by the Company were as follows: Three Months Ended March 31, 2017 March 31, 2016 Expected term (in years) 6.1 6.0 Risk-free interest rate 2.17 % 1.45 % Expected volatility 55 % 45 % Dividend yield — % — % Restricted Stock A summary of restricted stock activity for the three months ended March 31, 2017 is as follows: Number of Shares Weighted-Average Grant Date Fair Value (in thousands) Nonvested shares of restricted stock outstanding at December 31, 2016 1,113 $ 14.07 Granted — $ — Canceled — $ — Vested (2 ) $ 16.22 Nonvested shares of restricted stock outstanding at March 31, 2017 1,111 $ 14.07 The fair value of restricted stock with service conditions that vested during the three months ended March 31, 2017 was $0.01 million . At March 31, 2017 , the Company had unrecognized stock-based compensation expense for restricted stock with service conditions of $4.3 million , which is expected to be recognized over a weighted-average period of 2.1 years . Restricted Stock Units A summary of restricted stock unit activity for the three months ended March 31, 2017 is as follows: Number of Shares Weighted-Average Grant Date Fair Value (in thousands) Nonvested restricted stock units outstanding at December 31, 2016 2,903 $ 13.63 Granted 2,415 $ 6.01 Canceled (301 ) $ 12.95 Vested (118 ) $ 14.85 Nonvested restricted stock units outstanding at March 31, 2017 4,899 $ 9.89 The weighted-average grant date fair value per share of restricted stock units granted for three months ended March 31, 2017 was $6.01 . The fair value of restricted stock units that vested during three months ended March 31, 2017 was $0.7 million . At March 31, 2017 , the intrinsic value of nonvested restricted stock units was $28.9 million . At March 31, 2017 , the Company had unrecognized stock-based compensation expense relating to restricted stock units of approximately $35.6 million , which is expected to be recognized over a weighted-average period of 3.3 years . Employee Stock Purchase Plan In November 2013, the Company adopted the Company's 2014 Employee Stock Purchase Plan, or ESPP. The ESPP is designed to enable eligible employees to periodically purchase shares of the Company's common stock at a discount through payroll deductions of up to 10% of their eligible compensation, subject to any plan limitations. At the end of each six-month offering period, employees are able to purchase shares at a price per share equal to 85% of the lower of the fair market value of the Company's common stock on the first trading day of the offering period or on the last trading day of the offering period. Offering periods generally commence and end in May and November of each year. As of March 31, 2017 , the Company has reserved 1,479,751 shares of its common stock for issuance under the ESPP. Shares reserved for issuance increase on January 1 st of each year by the lesser of (i) a number of shares equal to 1% of the total number of outstanding shares of common stock on the December 31 st immediately prior to the date of increase or (ii) such number of shares as may be determined by the board of directors. Stock-Based Compensation Expense Total stock-based compensation expense recorded in the condensed consolidated statements of operations was as follows: Three Months Ended March 31, 2017 March 31, 2016 (in thousands) Cost of revenue $ 84 $ 62 Sales and marketing 1,435 2,114 Technology and development 1,075 1,374 General and administrative 2,709 4,841 Restructuring and other exit costs 936 — Total stock-based compensation expense $ 6,239 $ 8,391

Restructuring and Other Exit Co

Restructuring and Other Exit Costs	3 Months Ended
	Mar. 31, 2017
Restructuring and Related Activities [Abstract]
Restructuring and Other Exit Costs	Restructuring And Other Exit Costs As part of management's plan to streamline operations and prioritize resources for growth initiatives, the Company announced restructuring efforts that included a plan by which seven senior leaders would leave the Company and included the shut-down of the Company's intent marketing services. In connection with these activities, the Company recorded restructuring and other exit costs totaling $4.3 million for one-time employee termination benefits, operational costs related to the shut-down of the Company's intent marketing services, and other related costs. The following table summarizes restructuring and other exit costs recorded (in thousands): Accrued restructuring and other exit costs at December 31, 2016 $ 801 Restructuring and other exit costs (1) 4,338 Cash paid for restructuring and other exit costs (1,983 ) Non-cash stock based compensation for restructuring and other exit costs (936 ) Accrued restructuring and other exit costs at March 31, 2017 $ 2,220 (1) Restructuring and other exit costs for the three months ended March 31, 2017 consisted of $3.6 million in employee termination costs and $0.7 million in facility closing costs.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes In determining quarterly provisions for income taxes, the Company uses the annual estimated effective tax rate applied to the actual year-to-date income. The Company's annual estimated effective tax rate differs from the statutory rate primarily as a result of state taxes, foreign taxes, nondeductible stock option expenses, and changes in the Company's valuation allowance. The Company recorded an income tax expense of $0.4 million and an income tax benefit of $4.3 million for the three months ended March 31, 2017 and 2016 , respectively. The tax provision is primarily the result of the domestic and certain international valuation allowances and the geographical mix of income and losses. Due to uncertainty as to the realization of benefits from the Company's domestic and certain international deferred tax assets, including net operating loss carryforwards and research and development tax credits, the Company has a full valuation allowance reserved against such assets. The Company intends to continue to maintain a full valuation allowance on the deferred tax assets until there is sufficient evidence to support the reversal of all or some portion of these allowances. There were no material changes to the Company's unrecognized tax benefits in the three months ended March 31, 2017 , and the Company does not expect to have any significant changes to unrecognized tax benefits through the end of the fiscal year. Because of the Company's history of tax losses, all years remain open to tax audit. During the quarter, the Internal Revenue Service commenced an examination of the 2015 tax year.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases The Company has commitments under non-cancelable operating leases for facilities, certain equipment, and its managed data center facilities. Total rental expenses were $4.9 million and $4.0 million for the three months ended March 31, 2017 and 2016 . Rental expense for sublease rentals were $1.0 million and $0.7 million for the three months ended March 31, 2017 and 2016 , respectively. As of March 31, 2017 , $2.9 million of letters of credit associated with office leases were outstanding, none of which have been drawn down. The following table summarizes the Company's future minimum lease payments under non-cancelable operating leases and related sublease income at March 31, 2017 : 2017 2018 2019 2020 2021 Thereafter Total (in thousands) Operating lease obligations $ 5,738 $ 8,061 $ 5,933 $ 3,325 $ 1,235 $ 685 $ 24,977 Operating sublease income (389 ) (382 ) (96 ) — — — (867 ) Total $ 5,349 $ 7,679 $ 5,837 $ 3,325 $ 1,235 $ 685 $ 24,110 Purchase Obligations The Company’s purchase obligations were $1.0 million as of March 31, 2017 . Guarantees and Indemnification The Company’s agreements with sellers, buyers, and other third parties typically obligate it to provide indemnity and defense for losses resulting from claims of intellectual property infringement, damages to property or persons, business losses, or other liabilities. Generally, these indemnity and defense obligations relate to the Company’s own business operations, obligations, and acts or omissions. However, under some circumstances, the Company agrees to indemnify and defend contract counterparties against losses resulting from their own business operations, obligations, and acts or omissions, or the business operations, obligations, and acts or omissions of third parties. For example, because the Company’s business interposes the Company between buyers and sellers in various ways, buyers often require the Company to indemnify them against acts and omissions of sellers, and sellers often require the Company to indemnify them against acts and omissions of buyers. In addition, the Company’s agreements with sellers, buyers, and other third parties typically include provisions limiting the Company’s liability to the counterparty, and the counterparty’s liability to the Company. These limits sometimes do not apply to certain liabilities, including indemnity obligations. These indemnity and limitation of liability provisions generally survive termination or expiration of the agreements in which they appear. The Company has also entered into indemnification agreements with its directors, executive officers and certain other officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors, officers or employees. No material demands have been made upon the Company to provide indemnification under such agreements and there are no claims that the Company is aware of that could have a material effect on the Company’s condensed consolidated financial statements. Litigation The Company and its subsidiaries may from time to time be parties to legal or regulatory proceedings, lawsuits and other claims incident to their business activities and to the Company’s status as a public company. Such matters may include, among other things, assertions of contract breach or intellectual property infringement, claims for indemnity arising in the course of the Company’s business, regulatory investigations or enforcement proceedings, and claims by persons whose employment has been terminated. Such matters are subject to many uncertainties, and outcomes are not predictable with assurance. Consequently, management is unable to ascertain the ultimate aggregate amount of monetary liability, amounts which may be covered by insurance or recoverable from third parties, or the financial impact with respect to such matters as of March 31, 2017 . However, based on management’s knowledge as of March 31, 2017 , management believes that the final resolution of these matters known at such date, individually and in the aggregate, will not have a material adverse effect upon the Company’s condensed consolidated financial position, results of operations or cash flows. On March 31, 2017 , Guardian News & Media Limited (Guardian) issued proceedings (the Complaint) against the Company in the Chancery Division of the High Court of Justice in England & Wales. The Complaint alleges that the Company underpaid Guardian for inventory sold by Guardian through the Company's platform as a result of the fact that the Company charged fees to buyers of that inventory. Guardian claims the Company was precluded from charging buyer fees as a result of the contractual arrangements with Guardian and English agency law principles, as well as representations the Company allegedly made to Guardian. The Complaint claims damages including loss of revenue, interest, and costs, without specifying the amount of damages sought. The Company disputes Guardian’s claims and is defending them vigorously, but the Complaint involves disputed facts and complex legal questions, and its outcome is therefore uncertain. Even if Guardian were to prevail in this action, the Company does not believe payment of the damages that may be recoverable by Guardian would have a material adverse effect upon the Company's condensed consolidated financial position, results of operations, or cash flows. Employment Contracts The Company has entered into severance agreements with certain employees and officers. The Company may be required to pay severance and accelerate the vesting of certain equity awards in the event of involuntary terminations.

Organization and Summary of S18

Organization and Summary of Significant Accounting Policies Organization and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States Generally Accepted Accounting Principles, or GAAP, for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the results for the interim period presented have been included. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for any future interim period, the year ending December 31, 2017 , or for any future year. The condensed consolidated balance sheet at December 31, 2016 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto for the year ended December 31, 2016 included in its Annual Report on Form 10-K. There have been no significant changes in the Company's accounting policies from those disclosed in its audited consolidated financial statements and notes thereto for the year ended December 31, 2016 included in its Annual Report on Form 10-K.
Consolidation	Basis of Presentation and Summary of Significant Accounting Policies The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States Generally Accepted Accounting Principles, or GAAP, for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the results for the interim period presented have been included. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for any future interim period, the year ending December 31, 2017 , or for any future year. The condensed consolidated balance sheet at December 31, 2016 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto for the year ended December 31, 2016 included in its Annual Report on Form 10-K. There have been no significant changes in the Company's accounting policies from those disclosed in its audited consolidated financial statements and notes thereto for the year ended December 31, 2016 included in its Annual Report on Form 10-K.
Revenue Recognition	Revenue Recognition The Company generates revenue from buyers and sellers who use its solution for the purchase and sale of advertising inventory. The Company's solution enables buyers and sellers to purchase and sell advertising inventory by matching buyers and sellers, and by establishing rules and parameters for open and transparent auctions of advertising inventory. Buyers use the Company's solution to reach their intended audiences by buying advertising inventory that the Company makes available from sellers through its solution. Sellers use the Company's solution to monetize their inventory. The Company recognizes revenue upon fulfillment of its contractual obligations in connection with a completed transaction, subject to satisfying all other revenue recognition criteria, including (i) persuasive evidence of an arrangement existing, (ii) delivery having occurred or services having been rendered, (iii) the fees being fixed or determinable, and (iv) collectability being reasonably assured. The Company generally bills and collects the full purchase price of impressions from buyers, together with other fees, if applicable. The Company reports revenue on a net basis for arrangements in which it has determined that it does not act as the principal in the purchase and sale of advertising inventory because pricing is determined through the Company's auction process or directly between a buyer and a seller and the Company is not the primary obligor. In some cases, the Company generates revenue directly from sellers who maintain the primary relationship with buyers and utilize the Company's solution to transact and increase the monetization of their activities. The Company reports revenue on a net basis for these activities. The Company reports revenue on a gross basis for arrangements in which it has determined that the Company acts as the principal in the purchase and sale of advertising inventory because the Company has direct contractual relationships with and manages advertising campaigns on behalf of the buyer by acting as the primary obligor in the purchase of advertising inventory, the Company exercises discretion in establishing prices, the Company has credit risk, and the Company independently selects and purchases inventory from the seller. The Company's accounts receivable are recorded at the amount of gross billings to buyers, net of allowances, for the amounts the Company is responsible to collect, and the Company's accounts payable related to amounts due to sellers are recorded at the net amount payable to sellers. Accordingly, both accounts receivable and accounts payable appear large in relation to revenue reported on a net basis.
Goodwill	Goodwill Goodwill represents the excess of the aggregate fair value of the consideration transferred in a business combination over the fair value of the assets acquired, net of liabilities assumed. Goodwill is not amortized, but is subject to an annual impairment test. The Company tests for impairment of goodwill annually during the fourth quarter or more frequently if events or changes in circumstances indicate that goodwill may be impaired. For purposes of goodwill impairment testing, the Company operates as a single operating segment and has identified a single reporting unit. Events or changes in circumstances which could trigger an impairment review include a significant adverse change in legal factors or in the business climate, an adverse action or assessment by a regulator, unanticipated competition, a loss of key personnel, significant changes in the manner of the Company’s use of the acquired assets or the strategy for the Company’s overall business, significant negative industry or economic trends, or significant under performance relative to expected historical or projected future results of operations. In January 2017, the FASB issued new guidance intended to simplify the test for goodwill impairment, which the Company adopted during the three month period ended March 31, 2017. Testing goodwill for impairment involves a quantitative analysis whereby the estimated fair value of the reporting unit is compared with its respective carrying amount, including goodwill. However, prior to performing this quantitative goodwill impairment test, the Company has the option to first assess qualitative factors to determine whether or not it is necessary to perform the quantitative goodwill impairment test. If the Company chooses the qualitative option, the Company is not required to perform the quantitative goodwill impairment test unless it has determined, based on the qualitative assessment, that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the quantitative impairment test is required or chosen, the impairment test involves comparing the estimated fair value of the reporting unit with its respective carrying amount, including goodwill. If the estimated fair value of the reporting unit exceeds its carrying amount, including goodwill, goodwill is considered not to be impaired and no additional steps are necessary.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed financial statements and accompanying footnotes. Actual results could differ materially from these estimates.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Under the Jumpstart Our Business Startups Act, or the JOBS Act, the Company meets the definition of an emerging growth company. The Company has irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. In May 2014, the Financial Accounting Standards Board, or FASB, issued new accounting guidance that amends the guidance for revenue recognition to replace numerous industry-specific requirements and converges areas under the "Revenue from Contracts with Customers" topic with those of the International Financial Reporting Standards. The guidance implements a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. Other major provisions include the capitalization and amortization of certain contract costs, ensuring the time value of money is considered in the transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. These amendments were effective for reporting periods beginning after December 15, 2016, with early adoption prohibited. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. Subsequent to issuing the May 2014 guidance, in August 2015, the FASB issued amendments that deferred the effective date one year. As a result, the guidance is effective for reporting periods beginning after December 15, 2017, with early adoption permitted only as of annual reporting periods beginning after December 15, 2016. Since its issuance, the FASB has amended several aspects of the new guidance including provisions that clarify the implementation guidance on principal versus agent considerations in the new revenue recognition standard. The amendments clarify how an entity should identify the unit of accounting (i.e. the specified good or service) for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements. The Company has not yet selected a transition method, but is currently evaluating the new principle versus agent guidance with respect to its revenue arrangements and assessing the impact this guidance will have on the Company's condensed consolidated financial statements. In January 2016, the FASB issued new accounting guidance that changes certain recognition, measurement, presentation, and disclosure requirements for financial instruments. The new guidance requires all equity investments, except those accounted for under the equity method of accounting or resulting in consolidation, to be measured at fair value with changes in fair value recognized in net income. The guidance also simplifies the impairment assessment for equity investments without readily determinable fair values, amends the presentation requirements for changes in the fair value of financial liabilities, requires presentation of financial instruments by measurement category and form of financial asset, and eliminates the requirement to disclose the methods and significant assumptions used in estimating the fair value of financial instruments. The new guidance is effective for interim and annual periods beginning after December 15, 2017, and early adoption is not permitted except for the amended presentation requirements for changes in the fair value of financial liabilities. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In February 2016, the FASB issued new accounting guidance that requires an entity to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. This guidance offers specific accounting guidance for a lessee, a lessor, and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. This guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and requires a modified retrospective adoption, with early adoption permitted. Although the Company is currently evaluating the effect this guidance will have on its condensed consolidated financial statements and related disclosures, the Company anticipates the guidance to have an impact on its assets and liabilities, as most of its operating lease commitments will be subject to the new standard and recognized as right-of-use assets and lease liabilities. In June 2016, the FASB issued new guidance that changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The new guidance will be effective for the Company starting in the first quarter of fiscal 2021. Early adoption is permitted starting in the first quarter of fiscal 2020. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In August 2016, the FASB issued new guidance intended to reduce diversity in practice in how certain cash receipts and payments are classified in the statement of cash flows, including debt prepayment or extinguishment costs, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, and distributions from certain equity method investees. The new guidance will be effective for interim and annual periods beginning after December 15, 2017, and early adoption is permitted. The guidance requires application using a retrospective transition method. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In October 2016, the FASB issued new guidance intended to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Under the new guidance, entities should recognize the income tax consequences of such transfers when the transfers occur. The new guidance will be effective for interim and annual periods beginning after December 15, 2017, and early adoption is permitted. The guidance requires application using a modified retrospective transition method. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements. In January 2017, the FASB issued amended guidance for business combinations. The new pronouncement changes the definition of a business with the objective of adding guidance to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, and will be applied prospectively to any transactions occurring within the period of adoption. Early adoption is permitted, including for interim or annual periods in which the financial statements have not been issued or made available for issuance. Subsequent to adoption, the Company will apply this guidance to acquisitions or disposals occurring in the period of adoption and thereafter.

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the basic and diluted net income (loss) per share attributable to common stockholders: Three Months Ended March 31, 2017 March 31, 2016 (In thousands, except per share data) Basic EPS: Net income (loss) attributable to common stockholders $ (15,840 ) $ 2,284 Weighted-average common shares outstanding 49,446 47,137 Weighted-average unvested restricted shares (1,114 ) (1,700 ) Weighted-average escrow shares — (774 ) Weighted-average common shares outstanding used to compute net income (loss) per share 48,332 44,663 Basic net income (loss) per share $ (0.33 ) $ 0.05 Diluted EPS: Net income (loss) $ (15,840 ) $ 2,284 Weighted-average common shares used in basic EPS 48,332 44,663 Dilutive effect of weighted-average common stock options — 1,722 Dilutive effect of weighted-average restricted stock awards — 613 Dilutive effect of weighted-average restricted stock units — 897 Dilutive effect of weighted-average ESPP — 18 Dilutive effect of weighted-average escrow shares — 763 Weighted-average shares used to compute diluted net income (loss) per share 48,332 48,676 Diluted net income (loss) per share $ (0.33 ) $ 0.05
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following weighted-average shares have been excluded from the calculation of diluted net income (loss) per share attributable to common stockholders for each period presented because they are anti-dilutive: March 31, 2017 March 31, 2016 (in thousands) Options to purchase common stock 186 — Unvested restricted stock awards 224 — Unvested restricted stock units 661 — ESPP 58 — Total shares excluded from net income (loss) per share 1,129 —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at March 31, 2017 : Total Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Other Significant (in thousands) Cash equivalents $ 17,807 $ 10,111 $ 7,696 $ — Corporate debt securities $ 20,354 $ — $ 20,354 $ — U.S. Treasury, government and agency debt securities $ 18,250 $ 18,250 $ — $ — The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at December 31, 2016 : Total Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Other Significant (in thousands) Cash equivalents $ 15,776 $ 7,781 $ 7,995 $ — Corporate debt securities $ 17,314 $ — $ 17,314 $ — U.S. Treasury, government and agency debt securities $ 23,236 $ 23,236 $ — $ —

Other Balance Sheet Amounts (Ta

Other Balance Sheet Amounts (Tables)	3 Months Ended
	Mar. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Investments in marketable securities as of March 31, 2017 consisted of the following: Amortized Gross Gross Fair (in thousands) Available-for-sale — short-term: U.S. Treasury, government and agency debt securities $ 18,255 $ — $ (5 ) $ 18,250 Corporate debt securities 20,354 — — 20,354 Total $ 38,609 $ — $ (5 ) $ 38,604 As of March 31, 2017 and December 31, 2016 , the Company's available-for-sale securities had a weighted remaining contractual maturity of 0.2 years and 0.3 years , respectively. For the three months ended March 31, 2017 , there were no realized gains (losses) and there were no unrealized holding gains (losses) reclassified out of accumulated other comprehensive income (loss) into the condensed consolidated statements of operations for the sale of available-for-sale investments. Investments in marketable securities as of December 31, 2016 consisted of the following: Amortized Gross Gross Fair (in thousands) Available-for-sale — short-term: U.S. Treasury, government and agency debt securities $ 23,237 $ 1 $ (2 ) $ 23,236 Corporate debt securities 17,314 — — 17,314 Total $ 40,551 $ 1 $ (2 ) $ 40,550 The amortized cost and fair value of the Company's marketable securities at March 31, 2017 , by contractual years-to-maturity are as follows: Amortized Cost Fair Value (in thousands) Due in less than 1 year $ 38,609 $ 38,604 Due within 1-2 years — — Total $ 38,609 $ 38,604 Accounts payable and accrued expenses included the following: March 31, 2017 December 31, 2016 (in thousands) Accounts payable—seller $ 142,822 $ 197,261 Accounts payable—trade 5,251 7,930 Accrued employee-related payables 10,764 9,712 Total $ 158,837 $ 214,903
Investments in Marketable Securities	Investments in marketable securities as of December 31, 2016 consisted of the following: Amortized Gross Gross Fair (in thousands) Available-for-sale — short-term: U.S. Treasury, government and agency debt securities $ 23,237 $ 1 $ (2 ) $ 23,236 Corporate debt securities 17,314 — — 17,314 Total $ 40,551 $ 1 $ (2 ) $ 40,550 Investments in marketable securities as of March 31, 2017 consisted of the following: Amortized Gross Gross Fair (in thousands) Available-for-sale — short-term: U.S. Treasury, government and agency debt securities $ 18,255 $ — $ (5 ) $ 18,250 Corporate debt securities 20,354 — — 20,354 Total $ 38,609 $ — $ (5 ) $ 38,604
Amortized Cost and Fair Value of the Company's Marketable Securities	The amortized cost and fair value of the Company's marketable securities at March 31, 2017 , by contractual years-to-maturity are as follows: Amortized Cost Fair Value (in thousands) Due in less than 1 year $ 38,609 $ 38,604 Due within 1-2 years — — Total $ 38,609 $ 38,604
Schedule of Accounts Payable and Accrued Liabilities	Accounts payable and accrued expenses included the following: March 31, 2017 December 31, 2016 (in thousands) Accounts payable—seller $ 142,822 $ 197,261 Accounts payable—trade 5,251 7,930 Accrued employee-related payables 10,764 9,712 Total $ 158,837 $ 214,903

Intangible Assets (Tables)

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Details of the Company’s intangible assets were as follows: March 31, 2017 December 31, 2016 (in thousands) Amortizable intangible assets: Developed technology $ 13,418 $ 13,418 Customer relationships 3,330 3,330 Non-compete agreements 490 4,990 Total identifiable intangible assets, gross 17,238 21,738 Accumulated amortization— intangible assets: Developed technology (8,384 ) (7,652 ) Customer relationships (3,170 ) (2,837 ) Non-compete agreements (465 ) (4,445 ) Total accumulated amortization—intangible assets (12,019 ) (14,934 ) Total identifiable intangible assets, net $ 5,219 $ 6,804
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The estimated remaining amortization expense associated with the Company's intangible assets was as follows as of March 31, 2017 : Fiscal Year Amount (in thousands) 2017 1,717 2018 1,862 2019 1,640 Total $ 5,219

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A summary of stock option activity for the three months ended March 31, 2017 is as follows: Shares Under Option Weighted- Average Exercise Price Weighted- Average Contractual Life Aggregate Intrinsic Value (in thousands) (in thousands) Outstanding at December 31, 2016 3,861 $ 11.16 Granted 902 $ 5.86 Exercised (94 ) $ 3.90 Canceled (195 ) $ 12.50 Outstanding at March 31, 2017 4,474 $ 10.19 6.84 years $ 704 Exercisable at March 31, 2017 2,717 $ 10.38 5.64 years $ 642
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The Company estimates the fair value of stock options that contain service and/or performance conditions using the Black-Scholes option pricing model. The weighted-average input assumptions used by the Company were as follows: Three Months Ended March 31, 2017 March 31, 2016 Expected term (in years) 6.1 6.0 Risk-free interest rate 2.17 % 1.45 % Expected volatility 55 % 45 % Dividend yield — % — %
Nonvested Restricted Stock Shares Activity	A summary of restricted stock activity for the three months ended March 31, 2017 is as follows: Number of Shares Weighted-Average Grant Date Fair Value (in thousands) Nonvested shares of restricted stock outstanding at December 31, 2016 1,113 $ 14.07 Granted — $ — Canceled — $ — Vested (2 ) $ 16.22 Nonvested shares of restricted stock outstanding at March 31, 2017 1,111 $ 14.07
Schedule of Nonvested Restricted Stock Units Activity	A summary of restricted stock unit activity for the three months ended March 31, 2017 is as follows: Number of Shares Weighted-Average Grant Date Fair Value (in thousands) Nonvested restricted stock units outstanding at December 31, 2016 2,903 $ 13.63 Granted 2,415 $ 6.01 Canceled (301 ) $ 12.95 Vested (118 ) $ 14.85 Nonvested restricted stock units outstanding at March 31, 2017 4,899 $ 9.89
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs for all Plans	Total stock-based compensation expense recorded in the condensed consolidated statements of operations was as follows: Three Months Ended March 31, 2017 March 31, 2016 (in thousands) Cost of revenue $ 84 $ 62 Sales and marketing 1,435 2,114 Technology and development 1,075 1,374 General and administrative 2,709 4,841 Restructuring and other exit costs 936 — Total stock-based compensation expense $ 6,239 $ 8,391

Restructuring and Other Exit 24

Restructuring and Other Exit Costs (Tables)	3 Months Ended
	Mar. 31, 2017
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Other Exit Costs	The following table summarizes restructuring and other exit costs recorded (in thousands): Accrued restructuring and other exit costs at December 31, 2016 $ 801 Restructuring and other exit costs (1) 4,338 Cash paid for restructuring and other exit costs (1,983 ) Non-cash stock based compensation for restructuring and other exit costs (936 ) Accrued restructuring and other exit costs at March 31, 2017 $ 2,220 (1) Restructuring and other exit costs for the three months ended March 31, 2017 consisted of $3.6 million in employee termination costs and $0.7 million in facility closing costs.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	The following table summarizes the Company's future minimum lease payments under non-cancelable operating leases and related sublease income at March 31, 2017 : 2017 2018 2019 2020 2021 Thereafter Total (in thousands) Operating lease obligations $ 5,738 $ 8,061 $ 5,933 $ 3,325 $ 1,235 $ 685 $ 24,977 Operating sublease income (389 ) (382 ) (96 ) — — — (867 ) Total $ 5,349 $ 7,679 $ 5,837 $ 3,325 $ 1,235 $ 685 $ 24,110

Net Income (Loss) Per Share (De

Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic EPS:
Net income (loss) attributable to common stockholders	$ (15,840)	$ 2,284
Weighted-average common shares outstanding	49,446	47,137
Weighted-average unvested restricted shares	(1,114)	(1,700)
Weighted-average escrow shares	0	(774)
Weighted-average common shares outstanding used to compute net income (loss) per share	48,332	44,663
Basic net income (loss) per share	$ (0.33)	$ 0.05
Diluted EPS:
Net income (loss) attributable to common stockholders	$ (15,840)	$ 2,284
Weighted-average common shares used in basic EPS	48,332	44,663
Dilutive effect of weighted-average escrow shares (in shares)	0	763
Weighted-average shares used to compute diluted net income (loss) per share attributable to common stockholders (in shares)	48,332	48,676
Diluted net income (loss) per share attributable to common stockholders (in shares)	$ (0.33)	$ 0.05
Stock Option
Diluted EPS:
Dilutive effect of weighted-average share-based compensation (in shares)	0	1,722
Unvested restricted stock awards
Diluted EPS:
Dilutive effect of weighted-average share-based compensation (in shares)	0	613
Restricted Stock Units (RSUs)
Diluted EPS:
Dilutive effect of weighted-average share-based compensation (in shares)	0	897
ESPP
Diluted EPS:
Dilutive effect of weighted-average share-based compensation (in shares)	0	18

Net Income (Loss) Per Share (Na

Net Income (Loss) Per Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net income (loss) per share	1,129
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net income (loss) per share	186	0
Unvested restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net income (loss) per share	224	0
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net income (loss) per share	661	0
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net income (loss) per share	58	0

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 17,807	$ 15,776
Cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	10,111	7,781
Cash equivalents | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7,696	7,995
Cash equivalents | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	20,354	17,314
Corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
Corporate debt securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	20,354	17,314
Corporate debt securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
U.S. Treasury, government and agency debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	18,250	23,236
U.S. Treasury, government and agency debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	18,250	23,236
U.S. Treasury, government and agency debt securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
U.S. Treasury, government and agency debt securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 0	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Cash equivalents | Recurring
Class of Stock [Line Items]
Available-for-sale Securities	$ 17,807	$ 15,776

Other Balance Sheet Amounts (In

Other Balance Sheet Amounts (Investments in Marketable Securities) (Details) - Available-for-sale — short-term: - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 38,609	$ 40,551
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(5)	(2)
Fair Value	38,604	40,550
U.S. Treasury, government and agency debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,255	23,237
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(5)	(2)
Fair Value	18,250	23,236
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,354	17,314
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 20,354	$ 17,314

Other Balance Sheet Amounts (Am

Other Balance Sheet Amounts (Amortized cost and Fair Value of Marketable Securities) (Details) $ in Thousands	Mar. 31, 2017USD ($)
Balance Sheet Related Disclosures [Abstract]
Due in less than 1 year, Amortized Cost	$ 38,609
Due within 1-2 years, Amortized Cost	0
Total, Amortized Cost	38,609
Due within 1-2 years, Fair Value	0
Due in less than 1 year, Fair Value	38,604
Total, Fair Value	$ 38,604

Other Balance Sheet Amounts (Na

Other Balance Sheet Amounts (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Weighted remaining contractual maturity	2 months 5 days	3 months 5 days
Unrealized holding gains (losses)	$ 0

Other Balance Sheet Amounts (Ac

Other Balance Sheet Amounts (Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Accounts payable—seller	$ 142,822	$ 197,261
Accounts payable—trade	5,251	7,930
Accrued employee-related payables	10,764	9,712
Accounts payable and accrued expenses	$ 158,837	$ 214,903

Intangible Assets (Finite-Lived

Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 17,238	$ 21,738
Total accumulated amortization—intangible assets	(12,019)	(14,934)
Total	5,219	6,804
Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	13,418	13,418
Total accumulated amortization—intangible assets	(8,384)	(7,652)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	3,330	3,330
Total accumulated amortization—intangible assets	(3,170)	(2,837)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	490	4,990
Total accumulated amortization—intangible assets	$ (465)	$ (4,445)

Intangible Assets (Narrative) (

Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 1.6
Nonrecurring
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment		$ 23.5

Intangible Assets (Finite-Liv36

Intangible Assets (Finite-Lived Intangible Assets, Future Amortization Expense) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 1,717
2,018	1,862
2,019	1,640
Total	$ 5,219	$ 6,804

Stock-Based Compensation (Detai

Stock-Based Compensation (Details)	3 Months Ended
	Mar. 31, 2017shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Vesting Period	4 years
Number of Shares Available for Grant	4,645,881
Stock Option
Number of Shares
Award Vesting Rights, Percentage	25.00%

Stock-Based Compensation (Stock

Stock-Based Compensation (Stock Options Outstanding) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance | shares	3,861
Granted | shares	902
Exercised | shares	(94)
Canceled | shares	(195)
Ending balance | shares	4,474
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance | $ / shares	$ 11.16
Granted | $ / shares	5.86
Exercised | $ / shares	3.90
Canceled | $ / shares	12.50
Ending balance | $ / shares	$ 10.19
Outstanding	6 years 9 months 34 days
Outstanding, aggregate intrinsic value | $	$ 704
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Exercisable (in shares) | shares	2,717
Exercisable (in dollars per share) | $ / shares	$ 10.38
Exercisable	5 years 7 months 20 days
Exercisable, aggregate intrinsic value | $	$ 642

Stock-Based Compensation (Sto39

Stock-Based Compensation (Stock Options Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Number of Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 400
Unrecognized employee stock-based compensation	$ 6,100
Weighted average grant date fair value	$ 3.11
Options outstanding	4,474		3,861
Beginning balance	$ 11.16
Vesting Period	4 years
Stock-based compensation expense	$ 6,239	$ 8,391
Stock Option
Number of Shares
Unrecognized employee stock-based compensation, period for recognition	2 years 7 months

Stock-Based Compensation (Valua

Stock-Based Compensation (Valuation Assumptions) (Details) - Stock Option	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Number of Shares
Expected term (in years)	6 years 30 days	6 years
Risk-free interest rate	2.17%	1.45%
Expected volatility	55.00%	45.00%
Dividend yield	0.00%	0.00%

Stock-Based Compensation (Restr

Stock-Based Compensation (Restricted Stock Activity) (Details) - Restricted Stock Awards shares in Thousands	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Number of Shares
Beginning balance | shares	1,113
Granted | shares	0
Canceled | shares	0
Vested | shares	(2)
Ending balance | shares	1,111
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 14.07
Granted (in dollars per share) | $ / shares	0
Canceled (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	16.22
Ending balance (in dollars per share) | $ / shares	$ 14.07

Stock-Based Compensation (Res42

Stock-Based Compensation (Restricted Stock Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Number of Shares
Vesting Period	4 years
Stock-based compensation expense	$ 6,239	$ 8,391
Unvested restricted stock awards
Number of Shares
Granted	0
Granted (in dollars per share)	$ 0
Unvested restricted stock awards | Vesting, Requisite Service Conditions [Member]
Number of Shares
Unrecognized employee stock-based compensation	$ 4,300
Unrecognized employee stock-based compensation, period for recognition	2 years 1 month 1 day
Fair value of restricted stock unit	$ 0

Stock-Based Compensation (Res43

Stock-Based Compensation (Restricted Stock Units Activity) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Number of Shares
Granted	$ 5.86
Restricted Stock Units (RSUs)
Number of Shares
Beginning balance | shares	2,903
Granted | shares	2,415
Canceled | shares	(301)
Vested | shares	(118)
Ending balance | shares	4,899
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 13.63
Granted (in dollars per share)	6.01
Canceled (in dollars per share)	12.95
Vested (in dollars per share)	14.85
Ending balance (in dollars per share)	$ 9.89

Stock-Based Compensation (Res44

Stock-Based Compensation (Restricted Stock Units Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)$ / shares
Unvested restricted stock awards
Number of Shares
Grant date fair value | $ / shares	$ 0
Restricted Stock Units (RSUs)
Number of Shares
Unrecognized employee stock-based compensation | $	$ 35.6
Unrecognized employee stock-based compensation, period for recognition	3 years 3 months
Grant date fair value | $ / shares	$ 6.01
Fair value of restricted stock unit | $	$ 0.7
Intrinsic value of nonvested unit | $	$ 28.9
Restricted Stock Units (RSUs) | Weighted Average Grant Date Value Per Share
Number of Shares
Grant date fair value | $ / shares	$ 6.01

Stock-Based Compensation (Emplo

Stock-Based Compensation (Employee Stock Purchase Plan Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Number of Shares
Stock-based compensation expense	$ 6,239	$ 8,391
2014 Employee Stock Purchase Plan | Employee Stock
Number of Shares
Maximum employee subscription rate	10.00%
Purchase price of common stock, percent	85.00%
Number of Shares Reserved	1,479,751
Increase in shares authorized, percent of outstanding stock	1.00%

(Employee Stock Purchase Plan U

(Employee Stock Purchase Plan Using the Black-Scholes Model) (Details) - Stock Option	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Number of Shares
Expected term (in years)	6 years 30 days	6 years
Risk-free interest rate (in percentage)	2.17%	1.45%
Expected volatility (in percentage)	55.00%	45.00%
Dividend yield (in percentage)	0.00%	0.00%

Stock-Based Compensation (Expen

Stock-Based Compensation (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 6,239	$ 8,391
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	84	62
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,435	2,114
Technology and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,075	1,374
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,709	4,841
Restructuring and other exit costs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 936	$ 0

Restructuring and Other Exit 48

Restructuring and Other Exit Costs - Schedule of Restructuring and Other Exit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Reserve [Roll Forward]
Accrued restructuring and other exit costs at December 31, 2016	$ 801
Restructuring and other exit costs	4,338	$ 0
Cash paid for restructuring and other exit costs	(1,983)
Non-cash stock based compensation for restructuring and other exit costs	(936)
Accrued restructuring and other exit costs at March 31, 2017	2,220
Restructuring and other exit costs
Employee termination costs	3,600
Facility closing costs	$ 700

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 375	$ (4,328)

Commitments and Contingencies50

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Rental expense	$ 4.9	$ 4
Rent expense for sublease rentals	1	$ 0.7
Purchase obligations	1
Office Lease | Financial Standby Letter of Credit
Other Commitments [Line Items]
Letters of credit outstanding, amount	$ 2.9

(Operating Leases, Future Minim

(Operating Leases, Future Minimum Payments Due) (Details) $ in Thousands	Mar. 31, 2017USD ($)
Operating lease obligations
2,017	$ 5,738
2,018	8,061
2,019	5,933
2,020	3,325
2,021	1,235
Thereafter	685
Total	24,977
Operating sublease income
2,017	(389)
2,018	(382)
2,019	(96)
2,020	0
2,021	0
Thereafter	0
Total	(867)
Total lease obligations and sublease income
2,017	5,349
2,018	7,679
2,019	5,837
2,020	3,325
2,021	1,235
Thereafter	685
Total	$ 24,110