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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2017	Oct. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	RUBICON PROJECT, INC.
Entity Central Index Key	0001595974
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		49,791,391

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 99,525	$ 149,423
Marketable securities	39,480	40,550
Accounts receivable, net	132,958	192,064
Prepaid expenses and other current assets	10,500	9,540
TOTAL CURRENT ASSETS	282,463	391,577
Property and equipment, net	37,448	36,246
Internal use software development costs, net	13,617	16,522
Other assets, non-current	3,239	2,921
Intangible assets, net	18,122	6,804
Goodwill	0	65,705
TOTAL ASSETS	354,889	519,775
Current liabilities:
Accounts payable and accrued expenses	165,783	214,903
Other current liabilities	3,046	3,534
TOTAL CURRENT LIABILITIES	168,829	218,437
Deferred tax liability, net	42	42
Other liabilities, non-current	1,817	1,783
TOTAL LIABILITIES	170,688	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	414,081	398,787
Accumulated other comprehensive loss	87	(273)
Accumulated deficit	(229,967)	(99,001)
TOTAL STOCKHOLDERS' EQUITY	184,201	299,513
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 354,889	$ 519,775

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par or stated value per share	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock, par or stated value per share	$ 0.00001	$ 0.00001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares, issued	49,785,000	49,378,000
Common stock, shares, outstanding	49,785,000	49,378,000

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 35,211	$ 65,811	$ 124,148	$ 205,554
Expenses:
Cost of revenue	12,985	17,798	41,371	52,121
Sales and marketing	12,503	21,635	39,660	64,879
Technology and development	11,580	12,513	36,377	38,250
General and administrative	13,644	16,238	43,079	53,233
Restructuring and other exit costs	0	0	5,959	0
Goodwill, Impairment Loss	90,251	0	90,251	0
Total expenses	140,963	68,184	256,697	208,483
Loss from operations	(105,752)	(2,373)	(132,549)	(2,929)
Other (income) expense:
Interest income, net	(269)	(134)	(664)	(359)
Other income	(123)	(191)	(502)	(388)
Foreign exchange (gain) loss, net	242	(21)	1,093	(338)
Total other income, net	(150)	(346)	(73)	(1,085)
Loss before income taxes	(105,602)	(2,027)	(132,476)	(1,844)
Benefit for income taxes	(2,031)	(5,557)	(1,510)	(4,981)
Net income (loss)	(103,571)	3,530	(130,966)	3,137
Net income (loss) attributable to common stockholders	$ (103,571)	$ 3,530	$ (130,966)	$ 3,137
Net income (loss) per share:
Basic (usd per share)	$ (2.11)	$ 0.07	$ (2.69)	$ 0.07
Diluted (usd per share)	$ (2.11)	$ 0.07	$ (2.69)	$ 0.06
Weighted-average shares used to compute net income (loss) per share:
Weighted-average shares used to compute net income (loss) per share (in shares)	49,055	47,538	48,726	46,186
Weighted-average shares used to compute diluted net income (loss) per share (in shares)	49,055	48,683	48,726	49,126

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (103,571)	$ 3,530	$ (130,966)	$ 3,137
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of tax of $0 for the nine months ended September 30, 2017 and 2016	3	(7)	3	77
Foreign currency translation adjustments	87	(54)	357	(165)
Other comprehensive income (loss)	90	(61)	360	(88)
Comprehensive income (loss)	$ (103,481)	$ 3,469	$ (130,606)	$ 3,049

Consolidated Statements of Comprehensive Income (Loss) - Parenthetical - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on investments, net of tax	$ 0	$ 0

Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	AOCI Attributable to Parent [Member]	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)		101
Exercise of common stock options	391		391
Stock Issued During Period, Shares, New Issues		(134)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0
Shares Paid for Tax Withholding for Share Based Compensation		(367)
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(2,067)		(2,067)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		718
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0
Issuance of common stock related to RSU vesting (in shares)		89
Stock Issued During Period, Value, Employee Stock Purchase Plan	444		444
Stock-based compensation	16,526		16,526
Other comprehensive income (loss)	360
Net income (loss)	$ (130,966)
Ending Balance (in shares) at Sep. 30, 2017	49,785	49,785
Ending Balance at Sep. 30, 2017	$ 184,201	$ 0	$ 414,081	$ 87
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)	(229,967)				$ (229,967)
Additional Paid in Capital	$ 414,081

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
OPERATING ACTIVITIES:
Net income (loss)	$ (130,966)	$ 3,137
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	27,154	29,362
Stock-based compensation	16,188	22,048
Goodwill, Impairment Loss	90,251	0	$ 0
Loss on disposal of property and equipment	269	5
Provision for doubtful accounts	482	558
Unrealized foreign currency gains, net	372	0
Deferred income taxes	(1,453)	(4,985)
Changes in operating assets and liabilities, net of effect of business acquisitions:
Accounts receivable	58,876	65,025
Prepaid expenses and other assets	(1,478)	(3,276)
Accounts payable and accrued expenses	(49,972)	(63,141)
Other liabilities	(510)	78
Net cash provided by operating activities	9,213	48,811
INVESTING ACTIVITIES:
Purchases of property and equipment	(14,554)	(11,393)
Capitalized internal use software development costs	(6,127)	(7,526)
Acquisitions, net of cash acquired	(38,610)	(238)
Investments in available-for-sale securities	(66,419)	(22,722)
Maturities of available-for-sale securities	67,650	20,600
Net cash used in investing activities	(58,060)	(21,279)
FINANCING ACTIVITIES:
Proceeds from exercise of stock options	391	13,796
Proceeds from issuance of common stock under employee stock purchase plan	444	1,137
Taxes paid related to net share settlement	(2,067)	(4,886)
Net cash provided by (used in) financing activities	(1,232)	10,047
EFFECT OF EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS AND RESTRICTED CASH	186	(71)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(49,893)	37,508
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period	149,498	116,832	116,832
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period			$ 149,498
SUPPLEMENTAL DISCLOSURES OF OTHER CASH FLOW INFORMATION:
Capitalized assets financed by accounts payable and accrued expenses	2,065	1,754
Capitalized stock-based compensation	$ 338	$ 772

Organization and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 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 pioneered advertising automation technology and is one of the world’s largest advertising exchanges. The Company helps websites and applications thrive by giving them tools and expertise to sell ads easily and safely. In addition, the world’s leading agencies and brands rely on the Company's technology to execute billions of advertising transactions each month. 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 nine months ended September 30, 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 2016 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 with the exception of accounting for goodwill as described below. Reclassifications Certain prior period amounts have been reclassified to conform to the current period presentation. Specifically, this includes amounts reclassified to conform to the current year presentation in the condensed consolidated statements of cash flows. 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 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, although in some cases, payments are handled directly between buyers and sellers or third parties making seller inventory available. 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 reported revenue on a gross basis for revenue associated with its intent marketing solution, which the Company ceased providing in the first quarter of 2017. For its intent marketing solution, the Company determined that it acted as the principal in the purchase and sale of advertising inventory because the Company had direct contractual relationships with and managed advertising campaigns on behalf of the buyer by acting as the primary obligor in the purchase of advertising inventory, the Company exercised discretion in establishing prices, the Company had credit risk, and the Company independently selected and purchased inventory from the seller. For quarters ending after March 31, 2017, all the Company’s revenue is reported on a net basis. 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 impairment testing conducted 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. In January 2017, the FASB issued guidance on goodwill impairment testing. The new guidance reduces the complexity of goodwill impairment tests by no longer requiring entities to determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of the company to all of its assets and liabilities as if the Company had been acquired in a business combination. The Company adopted the provisions of this guidance during the three-month period ended March 31, 2017. Testing goodwill for impairment involves a quantitative analysis whereby the estimated fair value of the Company 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 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 Company with its respective carrying amount, including goodwill. If the estimated fair value of the Company exceeds its carrying amount, including goodwill, goodwill is considered not to be impaired and no additional steps are necessary. If the fair value is less than the carrying amount, including goodwill, then an impairment adjustment must be recorded. In the third quarter of 2017, the Company identified potential indications of impairment and performed a quantitative goodwill impairment assessment and determined that the fair value of the Company was less than the carrying value, including goodwill. As a result, the Company recorded a goodwill impairment charge of $90.3 million during the third quarter of 2017. Refer to Note 5 "Goodwill and Intangible Assets" for a description of the methods used to compute the goodwill impairment charge in the third quarter of 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. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption ("modified retrospective"). 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. Management has completed an initial assessment to determine the impact on the Company's condensed consolidated financial statements by analyzing the Company's primary revenue generating transaction types. Based on the preliminary assessment of applicable differences in the standard, management is further analyzing the treatment of volume discounts and tiered pricing. The Company intends to adopt the new standard on a modified retrospective basis in the first quarter of 2018. 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. The Company is currently evaluating the effect this guidance will have on its condensed consolidated financial statements and related disclosures, and anticipates the guidance to result in increases in 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 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 does not expect the guidance to have a material impact on the condensed consolidated financial statements. In November 2016, the FASB issued new guidance that requires a company to explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents in the statement of cash flow. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The new guidance will be effective for interim and annual periods beginning after December 15, 2017, and early adoption is permitted, including early adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The guidance requires application using a retrospective transition method to each period presented. The Company has early adopted this guidance during the nine months ended September 30, 2017 and has reflected the changes in the current and prior period statement of cash flow. 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. The Company does not expect the guidance to have a material impact on its condensed consolidated financial statements. In May 2017, the FASB issued new guidance for modification accounting of stock-based compensation expense. The new pronouncement provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting. The guidance notes that an entity should account for the effects of a modification unless the fair value of the modified award is the same as the fair value of the original award immediately before the original award was modified and it did not change any of the inputs to the valuation technique used to value the award, the vesting conditions did not change, and the classification of the award as either equity or liability did not change. 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. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements.

Net Income (Loss) Per Share

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

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						Nine Months Ended
	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016

	(in thousands, except per share data)
Basic EPS:
Net income (loss) attributable to common stockholders	$	(103,571	)	$	3,530		$	(130,966	)	$	3,137
Weighted-average common shares outstanding	49,800			48,935			49,638			48,273
Weighted-average unvested restricted shares	(745		)	(1,231		)	(912		)	(1,563		)
Weighted-average escrow shares	—			(166		)	—			(524		)
Weighted-average common shares outstanding used to compute net income (loss) per share	49,055			47,538			48,726			46,186
Basic net income (loss) per share	$	(2.11	)	$	0.07		$	(2.69	)	$	0.07
Diluted EPS:
Net income (loss) attributable to common stockholders	$	(103,571	)	$	3,530		$	(130,966	)	$	3,137
Weighted-average common shares used in basic EPS	49,055			47,538			48,726			46,186
Dilutive effect of weighted-average common stock options	—			536			—			1,191
Dilutive effect of weighted-average restricted stock awards	—			138			—			502
Dilutive effect of weighted-average restricted stock units	—			243			—			690
Dilutive effect of weighted-average ESPP	—			58			—			34
Dilutive effect of weighted-average escrow shares	—			170			—			523
Weighted-average shares used to compute diluted net income (loss) per share	49,055			48,683			48,726			49,126
Diluted net income (loss) per share	$	(2.11	)	$	0.07		$	(2.69	)	$	0.06

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:



	Three Months Ended		Nine Months Ended
	September 30, 2017	September 30, 2016	September 30, 2017	September 30, 2016

	(in thousands)
Options to purchase common stock	187	—	154	—
Unvested restricted stock awards	130	—	240	—
Unvested restricted stock units	238	—	495	—
ESPP	44	—	49	—
Total shares excluded from net income (loss) per share	599	—	938	—

Fair Value Measurements

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

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 September 30, 2017:



	Total		Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

	(in thousands)
Cash equivalents	$	17,189	$	11,394	$	5,795	$	—
Corporate debt securities	$	22,008	$	—	$	22,008	$	—
U.S. Treasury, government and agency debt securities	$	17,472	$	17,472	$	—	$	—

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
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

	(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 September 30, 2017 and December 31, 2016, cash equivalents of $17.2 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, but rather are 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.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Other Balance Sheet Amounts

9 Months Ended

Sep. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Other Balance Sheet Amounts

Investments in marketable securities as of September 30, 2017 consisted of the following:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value

	(in thousands)
Available-for-sale—short-term:
U.S. Treasury, government and agency debt securities	$	17,470	$	2	$	—	$	17,472
Corporate debt securities	22,008		—		—		22,008
Total	$	39,478	$	2	$	—	$	39,480

Investments in marketable securities as of December 31, 2016 consisted of the following:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value

	(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 Company's available-for-sale securities had a weighted remaining contractual maturity of 0.3 years as of September 30, 2017 and December 31, 2016. For the three and nine months ended September 30, 2017, there were no realized gains (losses) and there were no unrealized holding gains (losses) reclassified out of accumulated other comprehensive loss into the condensed consolidated statements of operations for the sale of available-for-sale investments.

Accounts payable and accrued expenses included the following:



	September 30, 2017		December 31, 2016

	(in thousands)
Accounts payable—seller	$	152,401	$	197,261
Accounts payable—trade	5,773		7,930
Accrued employee-related payables	7,609		9,712
Total accounts payable and accrued expenses	$	165,783	$	214,903

Cash, cash equivalents and restricted cash included in the cash flow is as follows:



	September 30, 2017		December 31, 2016

	(in thousands)
Cash and cash equivalents	$	99,525	$	149,423
Restricted cash (included in "prepaid expenses and other current assets")	80		75
Total cash, cash equivalents, and restricted cash	$	99,605	$	149,498

Business Combination

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Business Combinations

Business Combination

On July 14, 2017, the Company completed the merger of nToggle, Inc. ("nToggle") with Caviar Acquisition Corp., a wholly owned subsidiary of the Company, with nToggle surviving as a wholly owned subsidiary of Rubicon Project. nToggle is a Boston, Massachusetts based programmatic advertising company with traffic-shaping technology. The primary reason for the acquisition was to acquire technology, know-how and personnel that will enable the Company to offer services that make it easier and more cost-effective for buyers to find the inventory they seek among the billions of bid requests they receive. At closing, the Company paid net cash consideration of $38.6 million to the stockholders, warrantholders, and holders of vested in-the-money options of nToggle. In addition, the Company assumed 432,482 outstanding unvested in-the-money options and 77,499 shares of restricted stock held by continuing employees, and issued an aggregate of 174,117 restricted stock units to the continuing employees under the Company's 2014 Inducement Grant Equity Incentive Plan. The financial results of nToggle have been included in our condensed consolidated financial statements since the date of the acquisition.

The purchase price allocation as of the closing date was based on a preliminary valuation and is subject to revision as more detailed analyses are completed and additional information about the fair value of assets acquired and liabilities assumed becomes available. The major classes of assets and liabilities to which the Company has preliminarily allocated the purchase price were as follows as of September 30, 2017:



	Amount
	(in thousands)
Cash and cash equivalents	$	1,953
Accounts receivable	256
Prepaid and other assets	18
Fixed assets	763
Other non-current assets	82
Intangible assets	14,840
Goodwill	24,546
Total assets acquired	42,458
Accounts payable and accrued expenses	78
Deferred revenue	91
Deferred tax liability, net	1,719
Total liabilities assumed	1,888
Total net assets acquired	$	40,570

The Company recognized approximately $0.3 million of acquisition-related costs during the nine months ended September 30, 2017 that are recorded within General and Administrative expenses in the Company’s condensed consolidated statements of operations. As part of the acquisition of nToggle, the Company acquired nToggle's net operating losses of approximately $9.3 million. In addition, the Company recorded deferred tax liabilities related to acquired intangibles of $5.5 million net of deferred tax assets of $3.8 million primarily related to net operating loss carryforwards.

The following table summarizes the components of the acquired intangible assets and estimated useful lives (in thousands, except for estimated useful life):



	September 30, 2017		Estimated Useful Life
Developed technology	$	14,130	5
Non-compete agreements	690		2
Trademark & trade name	20		1.5
Total intangible assets acquired	$	14,840

The intangible assets are amortized on a straight-line basis, which approximates the pattern in which the economic benefits are consumed, over their estimated useful lives. Amortization of developed technology is included in cost of revenues, the amortization related to non-compete agreements is included in technology and development, and amortization related to trademark and trade name is included in general and administrative.

Goodwill resulting from the acquisition was primarily attributable to acquired workforce, an increase in development capabilities, increased offerings to customers, and enhanced opportunities for growth and innovation. Refer to Note 5 "Goodwill and Intangible Assets" for a description of the methods used to compute the charge for the impairment of consolidated goodwill of $90.3 million recorded in the third quarter of 2017. The acquired intangibles and goodwill resulting from the nToggle acquisition are not amortizable for tax purposes.

Unaudited Pro Forma Information

The following table provides unaudited condensed pro forma information to give effect to the nToggle acquisition as if it had occurred on January 1, 2016. The unaudited pro forma information reflects adjustments for additional amortization resulting from the fair value adjustments to assets acquired and liabilities assumed. The pro forma results do not include any anticipated cost synergies or other effects of the integration of nToggle. Accordingly, pro forma amounts are not necessarily indicative of the results that actually would have occurred had the acquisition been completed on the dates indicated, nor is it indicative of the actual or future operating results of the combined company.



	Three Months Ended					Nine Months Ended
	September 30, 2017			September 30, 2016		September 30, 2017			September 30, 2016

	(in thousands)
Pro forma revenues	$	35,270		$	66,022	$	125,083		$	205,962
Pro forma net income (loss)	$	(103,895	)	$	1,827	$	(134,665	)	$	(2,138	)

nToggle's technology was fully integrated into the Company's platform, and its pre-acquisition product will not be offered on a stand-alone basis. As a result, the determination of nToggle's post-acquisition revenue and operating results on a stand-alone basis is impracticable.

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

The Company has continued to experience a decrease in its stock price and market capitalization. In addition, during the third quarter of 2017, the Company identified certain developments that negatively impacted Rubicon Project's near-term outlook for its business. These developments included the strategic decision to make voluntary reductions in the fees the Company charges buyers in open market waterfall RTB transactions, header bidding, and direct pressure from buyers and sellers, which has recently accelerated dramatically. These developments caused Rubicon Project to revisit the assumptions supporting its cash flow projections. The Company concluded that these developments, together with the continued decline in the Company's market capitalization below the carrying value of its net assets, represented an indication of impairment that required it to perform a quantitative assessment of the fair value of the Company and its net assets during the third quarter of fiscal year 2017. The Company, with the assistance of a valuation consultant, performed a fair value assessment of its net assets using a weighting of fair values derived from income and market approaches.

The income approach is a forward-looking approach to estimating fair value and utilizes the 2017 remaining year forecast, projections for growth off that base, and a terminal growth rate. The discounted cash flow method is used for the income approach. The cash flows were discounted at a 16.2% rate, estimated as the weighted average cost of capital for Rubicon Project. The value of net operating losses and the excess working capital were then added in to determine the fair value utilizing the income approach.

The market approach is based upon a review of private and public company control transactions involving companies that are comparable to Rubicon Project. The Company performed two analyses under the market approach—a control premium analysis and a similar transaction analysis. In each of these analyses, the Company identified merger or acquisition transactions that were completed over the past three years involving targets that operate within the “Advertising” or “Internet Software and Services” industries and where the buyer was a strategic buyer. In the first, a control premium analysis, the Company calculated a control premium paid in each of these transactions. After analyzing the comparable transactions, the Company applied a control premium of 15% to its adjusted public equity value to derive the fair value of its net assets. An additional method under the market approach, the similar transactions method, was utilized to determine the fair value of the Company's net assets under a strategic buyer purchase scenario. In this analysis target companies were compared to the Company, and multiples paid in transactions were analyzed and applied to the Company. For this analysis, the Company focused on the EBITDA multiples paid and applied the selected multiples to Rubicon Project’s adjusted EBITDA for the twelve months ended September 30, 2017. Based on the results of this analysis, an adjusted EBITDA multiple of 2.0x was applied to calculate the fair value of the Company's net assets. In determining the comparability of publicly-traded companies, several factors were analyzed, including products and solutions, markets, growth patterns, relative size, earnings trends and other financial characteristics.

After deriving the fair value of the Company's net assets using the three methodologies (one income approach and two market approaches) described above, the Company compared the fair value to the carrying value of $274.4 million, and recorded an impairment charge of $90.3 million during the three months ended September 30, 2017.

As a result of the indications of impairment noted above, the Company also performed an interim impairment assessment of its long-lived assets, including intangible assets. Under this assessment, the carrying value of the Company's long-lived assets was compared to the undiscounted cash flows expected to be generated by the asset group over its remaining life. Based on this assessment, there was no impairment of long-lived assets.

Details of the Company's goodwill was as follows:



	September 30, 2017			December 31, 2016
	(in thousands)
Beginning balance	$	65,705		$	65,705
Additions from the acquisition of nToggle	24,546			—
Impairment of goodwill	(90,251		)	—
Ending balance	$	—		$	65,705

Details of the Company’s intangible assets other than goodwill were as follows:



	September 30, 2017			December 31, 2016

	(in thousands)
Amortizable intangible assets:
Developed technology	$	26,187		$	13,418
Customer relationships	2,880			3,330
Non-compete agreements	690			4,990
Trademarks	20			—
Total identifiable intangible assets, gross	29,777			21,738
Accumulated amortization—intangible assets:
Developed technology	(8,698		)	(7,652		)
Customer relationships	(2,880		)	(2,837		)
Non-compete agreements	(74		)	(4,445		)
Trademarks	(3		)	—
Total accumulated amortization—intangible assets	(11,655		)	(14,934		)
Total identifiable intangible assets, net	$	18,122		$	6,804

Amortization of intangible assets for the three and nine months ended September 30, 2017 were $1.2 million and $3.5 million, respectively. The estimated remaining amortization expense associated with the Company's intangible assets was as follows as of September 30, 2017:



Fiscal Year	Amount
	(in thousands)
Remaining 2017	$	1,261
2018	5,047
2019	4,650
2020	2,826
2021	2,826
2022 and thereafter	1,512
Total	$	18,122

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Stock-Based Compensation

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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. Outstanding options 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 for certain participants on a change in control, as defined in the governing plan. An aggregate of 5,306,129 shares remained available for future grants at September 30, 2017 under the plans.

Stock Options

A summary of stock option activity for the nine months ended September 30, 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	1,424		$	4.20
Exercised	(101	)	$	3.88
Expired	(481	)	$	12.24
Forfeited	(122	)	$	13.26
Outstanding at September 30, 2017	4,581		$	8.99	5.87 years	$	1,612
Exercisable at September 30, 2017	2,707		$	10.45	4.16 years	$	238

The aggregate total intrinsic value of options exercised for the nine months ended September 30, 2017 was $0.4 million. At September 30, 2017, the Company had unrecognized employee stock-based compensation expense relating to nonvested stock options of approximately $6.3 million, which is expected to be recognized over a weighted-average period of 2.9 years. The weighted-average grant date fair value per share of stock options granted during the nine months ended September 30, 2017 was $3.55. Total fair value of options vested during the nine months ended September 30, 2017 was $3.5 million.

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			Nine Months Ended
	September 30, 2017		September 30, 2016	September 30, 2017		September 30, 2016
Expected term (in years)	5.25		*	5.76		5.9
Risk-free interest rate	1.88	%	*	2.03	%	1.43	%
Expected volatility	62	%	*	57	%	48	%
Dividend yield	—	%	*	—	%	—	%

^{* No stock options were granted during the third quarter of 2016.}

Restricted Stock

A summary of restricted stock activity for the nine months ended September 30, 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	77		$	5.07
Canceled	(211	)	$	12.79
Vested	(259	)	$	15.05
Nonvested shares of restricted stock outstanding at September 30, 2017	720		$	13.12

The aggregate fair value of restricted stock with service conditions that vested during the nine months ended September 30, 2017 was $1.5 million. At September 30, 2017, the Company had unrecognized stock-based compensation expense for restricted stock with service conditions of $3.2 million, which is expected to be recognized over a weighted-average period of 1.5 years.

Restricted Stock Units

A summary of restricted stock unit activity for the nine months ended September 30, 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	3,030		$	5.76
Canceled	(722	)	$	11.61
Vested	(718	)	$	14.18
Nonvested restricted stock units outstanding at September 30, 2017	4,493		$	8.56

The weighted-average grant date fair value per share of restricted stock units granted during the nine months ended September 30, 2017 was $5.76. The aggregate fair value of restricted stock units that vested during nine months ended September 30, 2017 was $4.1 million. At September 30, 2017, the intrinsic value of nonvested restricted stock units was $17.4 million. At September 30, 2017, the Company had unrecognized stock-based compensation expense relating to nonvested restricted stock units of approximately $28.0 million, which is expected to be recognized over a weighted-average period of 3.02 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' accumulated contributions are applied 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 September 30, 2017, the Company has reserved 1,569,188 shares of its common stock for issuance under the ESPP.

Stock-Based Compensation Expense

Total stock-based compensation expense recorded in the condensed consolidated statements of operations was as follows:



	Three Months Ended				Nine Months Ended
	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016

	(in thousands)
Cost of revenue	$	115	$	91	$	295	$	261
Sales and marketing	1,115		2,054		3,524		6,711
Technology and development	1,122		1,287		3,178		4,461
General and administrative	2,294		3,099		7,631		10,615
Restructuring and other exit costs	—		—		1,560		—
Total stock-based compensation expense	$	4,646	$	6,531	$	16,188	$	22,048

Restructuring and Other Exit Costs

9 Months Ended

Sep. 30, 2017

Restructuring and Related Activities [Abstract]

Restructuring and Other Exit Costs

As part of management's plan to streamline operations and prioritize resources for growth initiatives in the first quarter of 2017, the Company implemented a management restructuring involving the departure of senior leaders and the shut-down of the Company's intent marketing services. For the nine months ended September 30, 2017, in connection with these initiatives, the Company recorded restructuring and other exit costs totaling $6.0 million for one-time employee termination benefits, operational shut-down costs and other related costs.

The following table summarizes the accrued restructuring liability related to this plan, which is recorded in "Accounts payable and accrued expenses" on the condensed consolidated balance sheet:



	Amount
	(in thousands)
Accrued restructuring and other exit costs at December 31, 2016	$	801
Restructuring and other exit costs ⁽¹⁾	5,959
Cash paid for restructuring and other exit costs	(4,965		)
Non-cash stock-based compensation for restructuring and other exit costs	(1,560		)
Accrued restructuring and other exit costs at September 30, 2017	$	235

^{(1) Restructuring and other exit costs were de minimis for the}^{three months ended}^{September 30, 2017}^{. For the nine months ended}^{September 30, 2017}^{, Restructuring and other exit costs consisted of}^{$5.1 million}^{in employee termination costs and}^{$0.9 million}^{in facility closing costs.}

The Company expects to pay the majority of the remaining expenses by the fourth quarter of 2017.

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 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 income tax benefit of $2.0 million and $5.6 million for the three months ended September 30, 2017 and 2016, respectively, and income benefit of $1.5 million and $5.0 million for the nine months ended September 30, 2017 and 2016, respectively. The tax benefit for the three and nine months ended September 30, 2017 is primarily the result of the deferred tax liability associated with the nToggle acquisition. 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 nine months ended September 30, 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 first quarter of 2017, the Internal Revenue Service commenced an examination of the 2015 tax year.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 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 $3.1 million and $3.0 million for the three months ended September 30, 2017 and 2016, respectively. Total rental expenses were $9.4 million and $8.3 million for the nine months ended September 30, 2017 and 2016, respectively. Additionally, expenses for cloud-based services related to data centers were $0.8 million and $1.3 million for the three months ended September 30, 2017 and 2016, respectively, and $3.6 million and $4.3 million for the nine months ended September 30, 2017 and 2016, respectively. As of September 30, 2017, $2.9 million of letters of credit associated with office leases were outstanding, none of which have been drawn down. Purchase Obligations The Company’s purchase obligations or remaining payments due under existing contracts were $0.8 million as of September 30, 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 September 30, 2017. However, based on management’s knowledge as of September 30, 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 Significant Accounting Policies Organization and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 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 2016 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 with the exception of accounting for goodwill as described below. Re
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 nine months ended September 30, 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 2016 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 with the exception of accounting for goodwill as described below. Re
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 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, although in some cases, payments are handled directly between buyers and sellers or third parties making seller inventory available. 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 reported revenue on a gross basis for revenue associated with its intent marketing solution, which the Company ceased providing in the first quarter of 2017. For its intent marketing solution, the Company determined that it acted as the principal in the purchase and sale of advertising inventory because the Company had direct contractual relationships with and managed advertising campaigns on behalf of the buyer by acting as the primary obligor in the purchase of advertising inventory, the Company exercised discretion in establishing prices, the Company had credit risk, and the Company independently selected and purchased inventory from the seller. For quarters ending after March 31, 2017, all the Company’s revenue is reported on a net basis. 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 impairment testing conducted 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. In January 2017, the FASB issued guidance on goodwill impairment testing. The new guidance reduces the complexity of goodwill impairment tests by no longer requiring entities to determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of the company to all of its assets and liabilities as if the Company had been acquired in a business combination. The Company adopted the provisions of this guidance during the three-month period ended March 31, 2017. Testing goodwill for impairment involves a quantitative analysis whereby the estimated fair value of the Company 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 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 Company with its respective carrying amount, including goodwill. If the estimated fair value of the Company exceeds its carrying amount, including goodwill, goodwill is considered not to be impaired and no additional steps are necessary. If the fair value is less than the carrying amount, including goodwill, then an impairment adjustment must be recorded. In the third quarter of 2017, the Company identified potential indications of impairment and performed a quantitative goodwill impairment assessment and determined that the fair value of the Company was less than the carrying value, including goodwill. As a result, the Company recorded a goodwill impairment charge of $90.3 million during the third quarter of 2017. Refer to Note 5 "Goodwill and Intangible Assets" for a description of the methods used to compute the goodwill impairment charge in the third quarter of 2017.
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. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption ("modified retrospective"). 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. Management has completed an initial assessment to determine the impact on the Company's condensed consolidated financial statements by analyzing the Company's primary revenue generating transaction types. Based on the preliminary assessment of applicable differences in the standard, management is further analyzing the treatment of volume discounts and tiered pricing. The Company intends to adopt the new standard on a modified retrospective basis in the first quarter of 2018. 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. The Company is currently evaluating the effect this guidance will have on its condensed consolidated financial statements and related disclosures, and anticipates the guidance to result in increases in 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 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 does not expect the guidance to have a material impact on the condensed consolidated financial statements. In November 2016, the FASB issued new guidance that requires a company to explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents in the statement of cash flow. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The new guidance will be effective for interim and annual periods beginning after December 15, 2017, and early adoption is permitted, including early adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The guidance requires application using a retrospective transition method to each period presented. The Company has early adopted this guidance during the nine months ended September 30, 2017 and has reflected the changes in the current and prior period statement of cash flow. 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. The Company does not expect the guidance to have a material impact on its condensed consolidated financial statements. In May 2017, the FASB issued new guidance for modification accounting of stock-based compensation expense. The new pronouncement provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting. The guidance notes that an entity should account for the effects of a modification unless the fair value of the modified award is the same as the fair value of the original award immediately before the original award was modified and it did not change any of the inputs to the valuation technique used to value the award, the vesting conditions did not change, and the classification of the award as either equity or liability did not change. 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. The Company is currently assessing the impact this guidance will have on its condensed consolidated financial statements.

Net Income (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 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						Nine Months Ended
	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016

	(in thousands, except per share data)
Basic EPS:
Net income (loss) attributable to common stockholders	$	(103,571	)	$	3,530		$	(130,966	)	$	3,137
Weighted-average common shares outstanding	49,800			48,935			49,638			48,273
Weighted-average unvested restricted shares	(745		)	(1,231		)	(912		)	(1,563		)
Weighted-average escrow shares	—			(166		)	—			(524		)
Weighted-average common shares outstanding used to compute net income (loss) per share	49,055			47,538			48,726			46,186
Basic net income (loss) per share	$	(2.11	)	$	0.07		$	(2.69	)	$	0.07
Diluted EPS:
Net income (loss) attributable to common stockholders	$	(103,571	)	$	3,530		$	(130,966	)	$	3,137
Weighted-average common shares used in basic EPS	49,055			47,538			48,726			46,186
Dilutive effect of weighted-average common stock options	—			536			—			1,191
Dilutive effect of weighted-average restricted stock awards	—			138			—			502
Dilutive effect of weighted-average restricted stock units	—			243			—			690
Dilutive effect of weighted-average ESPP	—			58			—			34
Dilutive effect of weighted-average escrow shares	—			170			—			523
Weighted-average shares used to compute diluted net income (loss) per share	49,055			48,683			48,726			49,126
Diluted net income (loss) per share	$	(2.11	)	$	0.07		$	(2.69	)	$	0.06

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share



	Three Months Ended		Nine Months Ended
	September 30, 2017	September 30, 2016	September 30, 2017	September 30, 2016

	(in thousands)
Options to purchase common stock	187	—	154	—
Unvested restricted stock awards	130	—	240	—
Unvested restricted stock units	238	—	495	—
ESPP	44	—	49	—
Total shares excluded from net income (loss) per share	599	—	938	—

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2017:



	Total		Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

	(in thousands)
Cash equivalents	$	17,189	$	11,394	$	5,795	$	—
Corporate debt securities	$	22,008	$	—	$	22,008	$	—
U.S. Treasury, government and agency debt securities	$	17,472	$	17,472	$	—	$	—

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
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

	(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 (Tables)

9 Months Ended

Sep. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Investments in Marketable Securities

Investments in marketable securities as of December 31, 2016 consisted of the following:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value

	(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

Schedule of Accounts Payable and Accrued Liabilities

Accounts payable and accrued expenses included the following:



	September 30, 2017		December 31, 2016

	(in thousands)
Accounts payable—seller	$	152,401	$	197,261
Accounts payable—trade	5,773		7,930
Accrued employee-related payables	7,609		9,712
Total accounts payable and accrued expenses	$	165,783	$	214,903

Schedule of Restricted Cash and Cash Equivalents

Cash, cash equivalents and restricted cash included in the cash flow is as follows:



	September 30, 2017		December 31, 2016

	(in thousands)
Cash and cash equivalents	$	99,525	$	149,423
Restricted cash (included in "prepaid expenses and other current assets")	80		75
Total cash, cash equivalents, and restricted cash	$	99,605	$	149,498

Business Combination (Tables)

9 Months Ended

Sep. 30, 2017

Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

The following table summarizes the components of the acquired intangible assets and estimated useful lives (in thousands, except for estimated useful life):



	September 30, 2017		Estimated Useful Life
Developed technology	$	14,130	5
Non-compete agreements	690		2
Trademark & trade name	20		1.5
Total intangible assets acquired	$	14,840

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The major classes of assets and liabilities to which the Company has preliminarily allocated the purchase price were as follows as of September 30, 2017:



	Amount
	(in thousands)
Cash and cash equivalents	$	1,953
Accounts receivable	256
Prepaid and other assets	18
Fixed assets	763
Other non-current assets	82
Intangible assets	14,840
Goodwill	24,546
Total assets acquired	42,458
Accounts payable and accrued expenses	78
Deferred revenue	91
Deferred tax liability, net	1,719
Total liabilities assumed	1,888
Total net assets acquired	$	40,570

nToggle

Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]

Business Acquisition, Pro Forma Information



	Three Months Ended					Nine Months Ended
	September 30, 2017			September 30, 2016		September 30, 2017			September 30, 2016

	(in thousands)
Pro forma revenues	$	35,270		$	66,022	$	125,083		$	205,962
Pro forma net income (loss)	$	(103,895	)	$	1,827	$	(134,665	)	$	(2,138	)

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Details of the Company's goodwill was as follows:



	September 30, 2017			December 31, 2016
	(in thousands)
Beginning balance	$	65,705		$	65,705
Additions from the acquisition of nToggle	24,546			—
Impairment of goodwill	(90,251		)	—
Ending balance	$	—		$	65,705

Schedule of Finite-Lived Intangible Assets

Details of the Company’s intangible assets other than goodwill were as follows:



	September 30, 2017			December 31, 2016

	(in thousands)
Amortizable intangible assets:
Developed technology	$	26,187		$	13,418
Customer relationships	2,880			3,330
Non-compete agreements	690			4,990
Trademarks	20			—
Total identifiable intangible assets, gross	29,777			21,738
Accumulated amortization—intangible assets:
Developed technology	(8,698		)	(7,652		)
Customer relationships	(2,880		)	(2,837		)
Non-compete agreements	(74		)	(4,445		)
Trademarks	(3		)	—
Total accumulated amortization—intangible assets	(11,655		)	(14,934		)
Total identifiable intangible assets, net	$	18,122		$	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 September 30, 2017:



Fiscal Year	Amount
	(in thousands)
Remaining 2017	$	1,261
2018	5,047
2019	4,650
2020	2,826
2021	2,826
2022 and thereafter	1,512
Total	$	18,122

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 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 nine months ended September 30, 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	1,424		$	4.20
Exercised	(101	)	$	3.88
Expired	(481	)	$	12.24
Forfeited	(122	)	$	13.26
Outstanding at September 30, 2017	4,581		$	8.99	5.87 years	$	1,612
Exercisable at September 30, 2017	2,707		$	10.45	4.16 years	$	238

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions



	Three Months Ended			Nine Months Ended
	September 30, 2017		September 30, 2016	September 30, 2017		September 30, 2016
Expected term (in years)	5.25		*	5.76		5.9
Risk-free interest rate	1.88	%	*	2.03	%	1.43	%
Expected volatility	62	%	*	57	%	48	%
Dividend yield	—	%	*	—	%	—	%

^{* No stock options were granted during the third quarter of 2016.}

Nonvested Restricted Stock Shares Activity

A summary of restricted stock activity for the nine months ended September 30, 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	77		$	5.07
Canceled	(211	)	$	12.79
Vested	(259	)	$	15.05
Nonvested shares of restricted stock outstanding at September 30, 2017	720		$	13.12

Schedule of Nonvested Restricted Stock Units Activity

A summary of restricted stock unit activity for the nine months ended September 30, 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	3,030		$	5.76
Canceled	(722	)	$	11.61
Vested	(718	)	$	14.18
Nonvested restricted stock units outstanding at September 30, 2017	4,493		$	8.56

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				Nine Months Ended
	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016

	(in thousands)
Cost of revenue	$	115	$	91	$	295	$	261
Sales and marketing	1,115		2,054		3,524		6,711
Technology and development	1,122		1,287		3,178		4,461
General and administrative	2,294		3,099		7,631		10,615
Restructuring and other exit costs	—		—		1,560		—
Total stock-based compensation expense	$	4,646	$	6,531	$	16,188	$	22,048

Restructuring and Other Exit Costs (Tables)

9 Months Ended

Sep. 30, 2017

Restructuring and Related Activities [Abstract]

Schedule of Restructuring and Other Exit Costs

The following table summarizes the accrued restructuring liability related to this plan, which is recorded in "Accounts payable and accrued expenses" on the condensed consolidated balance sheet:



	Amount
	(in thousands)
Accrued restructuring and other exit costs at December 31, 2016	$	801
Restructuring and other exit costs ⁽¹⁾	5,959
Cash paid for restructuring and other exit costs	(4,965		)
Non-cash stock-based compensation for restructuring and other exit costs	(1,560		)
Accrued restructuring and other exit costs at September 30, 2017	$	235

Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic EPS:
Net income (loss) attributable to common stockholders	$ (103,571)	$ 3,530	$ (130,966)	$ 3,137
Weighted-average common shares outstanding (in shares)	49,800	48,935	49,638	48,273
Weighted-average unvested restricted shares (in shares)	(745)	(1,231)	(912)	(1,563)
Weighted-average escrow shares (in shares)	0	(166)	0	(524)
Weighted-average shares used to compute net income (loss) per share (in shares)	49,055	47,538	48,726	46,186
Basic net income (loss) per share (usd per share)	$ (2.11)	$ 0.07	$ (2.69)	$ 0.07
Diluted EPS:
Net income (loss) attributable to common stockholders	$ (103,571)	$ 3,530	$ (130,966)	$ 3,137
Weighted-average common shares used in basic EPS (in shares)	49,055	47,538	48,726	46,186
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of weighted-average escrow shares	0	170	0	523
Weighted-average shares used to compute diluted net income (loss) per share (in shares)	49,055	48,683	48,726	49,126
Diluted net income (loss) per share (usd per share)	$ (2.11)	$ 0.07	$ (2.69)	$ 0.06
Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of share-based payments	0	536	0	1,191
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of share-based payments	0	138	0	502
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of share-based payments	0	243	0	690
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of share-based payments	0	58	0	34

Net Income (Loss) Per Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net income (loss) per share (in shares)	599	0	938	0
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 (in shares)	187	0	154	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 (in shares)	130	0	240	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 (in shares)	238	0	495	0
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net income (loss) per share (in shares)	44	0	49	0

Fair Value Measurements (Financial Instruments) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 17,189	$ 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	11,394	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	5,795	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	22,008	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	22,008	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	17,472	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	17,472	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 (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Cash equivalents \| Recurring
Class of Stock [Line Items]
Available-for-sale Securities	$ 17,189	$ 15,776

Other Balance Sheet Amounts (Investments in Marketable Securities) (Details) - Available-for-sale—short-term: - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 39,478	$ 40,551
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	(2)
Fair Value	39,480	40,550
U.S. Treasury, government and agency debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,470	23,237
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	(2)
Fair Value	17,472	23,236
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,008	17,314
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 22,008	$ 17,314

Other Balance Sheet Amounts (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Weighted remaining contractual maturity		3 months 5 days	3 months 5 days
Realized gains (losses) on available-for-sale securities	$ 0	$ 0
Unrealized holding gains (losses) reclassified out of AOCI into the statements of operations for the sale of AFS investments	$ 0	$ 0

Other Balance Sheet Amounts (Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Accounts payable—seller	$ 152,401	$ 197,261
Accounts payable—trade	5,773	7,930
Accrued employee-related payables	7,609	9,712
Accounts payable and accrued expenses	$ 165,783	$ 214,903

Other Balance Sheet Amounts - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Balance Sheet Related Disclosures [Abstract]
Cash and cash equivalents	$ 99,525	$ 149,423
Restricted cash (included in prepaid expenses and other current assets)	80	75
Total cash, cash equivalents, and restricted cash	$ 99,605	$ 149,498	$ 154,340

Business Combination (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 14, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill, Impairment Loss		$ 90,251	$ 0	$ 90,251	$ 0	$ 0
nToggle
Business Acquisition [Line Items]
Cash consideration paid	$ 38,600
Outstanding unvested in-the-money options assumed	432,482
Restricted stock assumed	77,499
Equity interest issued, number of shares	174,117
Net operating loss acquired				9,300
Deferred tax liabilities related to acquired intangibles		5,500		5,500
Deferred tax assets related to net operating loss carryforwards		$ 3,800		3,800
nToggle \| General and administrative
Business Acquisition [Line Items]
Acquisition-related costs				$ 300

Business Combination (Allocation of Total Purchase Consideration) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 0	$ 65,705	$ 65,705
nToggle
Business Acquisition [Line Items]
Cash and cash equivalents	1,953
Accounts receivable	256
Prepaid and other assets	18
Fixed assets	763
Other non-current assets	82
Intangible assets	14,840
Goodwill	24,546
Total assets acquired	42,458
Accounts payable and accrued expenses	78
Deferred revenue	91
Deferred tax liability, net	1,719
Total liabilities assumed	1,888
Total net assets acquired	$ 40,570

Business Combination (Acquired Intangible Assets) (Details) - nToggle - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangible Assets			$ 14,840
Pro forma revenues	$ 35,270	$ 66,022	125,083	$ 205,962
Pro forma net income (loss)	$ (103,895)	$ 1,827	(134,665)	$ (2,138)
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangible Assets			$ 14,130
Estimated Useful Life			5 years
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangible Assets			$ 690
Estimated Useful Life			2 years
Trademark & trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangible Assets			$ 20
Estimated Useful Life			1 year 6 months

Business Combination (Pro Forma Information) (Details) - nToggle - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Pro forma revenues	$ 35,270	$ 66,022	$ 125,083	$ 205,962
Pro forma net income (loss)	$ (103,895)	$ 1,827	$ (134,665)	$ (2,138)

Goodwill and Intangible Assets (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 90,251	$ 0	$ 90,251	$ 0	$ 0
Nets assets carrying value prior to impairment	274,400		274,400
Amortization expense of intangible assets	$ 1,200		$ 3,500
Income Approach Valuation Technique
Finite-Lived Intangible Assets [Line Items]
Rate used for discounted cash flow method	16.20%
Market Approach Valuation Technique
Finite-Lived Intangible Assets [Line Items]
Rate used for control premium	15.00%
Multiple for EBITDA			2

Goodwill and Intangible Assets (Goodwill Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance			$ 65,705	$ 65,705	$ 65,705
Additions from the acquisition of nToggle			24,546		0
Goodwill, Impairment Loss	$ 90,251	$ 0	90,251	$ 0	0
Ending balance	$ 0		$ 0		$ 65,705

Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 29,777	$ 21,738
Total accumulated amortization—intangible assets	(11,655)	(14,934)
Total	18,122	6,804
Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	26,187	13,418
Total accumulated amortization—intangible assets	(8,698)	(7,652)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	2,880	3,330
Total accumulated amortization—intangible assets	(2,880)	(2,837)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	690	4,990
Total accumulated amortization—intangible assets	(74)	(4,445)
Trademarks
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	20	0
Total accumulated amortization—intangible assets	$ (3)	$ 0

Goodwill and Intangible Assets (Finite-Lived Intangible Assets, Future Amortization Expense) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2017	$ 1,261
2018	5,047
2019	4,650
2020	2,826
2021	2,826
2022 and thereafter	1,512
Total	$ 18,122	$ 6,804

Stock-Based Compensation (Details)	9 Months Ended
Stock-Based Compensation (Details)	Sep. 30, 2017 shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Vesting Period	4 years
Number of shares available for grant	5,306,129
Stock Option
Number of Shares
Award vesting rights, percentage	25.00%

Stock-Based Compensation (Stock Options Outstanding) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares) \| shares	3,861
Granted (in shares) \| shares	1,424
Exercised (in shares) \| shares	(101)
Expired (in shares) \| shares	(481)
Forfeited (in shares) \| shares	(122)
Ending balance (in shares) \| shares	4,581
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (usd per share) \| $ / shares	$ 11.16
Granted (usd per share) \| $ / shares	4.20
Exercised (usd per share) \| $ / shares	3.88
Expired (usd per share) \| $ / shares	12.24
Canceled (usd per share) \| $ / shares	13.26
Ending balance (usd per share) \| $ / shares	$ 8.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding	5 years 10 months 13 days
Outstanding, aggregate intrinsic value \| $	$ 1,612
Exercisable (in shares) \| shares	2,707
Exercisable (usd per share) \| $ / shares	$ 10.45
Exercisable	4 years 60 days
Exercisable, aggregate intrinsic value \| $	$ 238

Stock-Based Compensation (Stock Options Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 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	$ 6,300		$ 6,300
Weighted average grant date fair value			$ 3.55
Options outstanding (in shares)	4,581		4,581		3,861
Beginning balance (usd per share)			$ 11.16
Vesting Period			4 years
Stock-based compensation expense	$ 4,646	$ 6,531	$ 16,188	$ 22,048
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			$ 3,500
Stock Option
Number of Shares
Unrecognized employee stock-based compensation, period for recognition			2 years 11 months 10 days

Stock-Based Compensation (Valuation Assumptions) (Details) - Stock Option	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Number of Shares
Expected term (in years)	5 years 3 months	5 years 9 months 4 days	5 years 10 months 24 days
Risk-free interest rate	1.88%	2.03%	1.43%
Expected volatility	62.00%	57.00%	48.00%
Dividend yield	0.00%	0.00%	0.00%

Stock-Based Compensation (Restricted Stock Activity) (Details) - Restricted Stock Awards shares in Thousands	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Number of Shares
Beginning balance \| shares	1,113
Granted \| shares	77
Canceled \| shares	(211)
Vested \| shares	(259)
Ending balance \| shares	720
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) \| $ / shares	$ 14.07
Granted (in dollars per share) \| $ / shares	5.07
Canceled (in dollars per share) \| $ / shares	12.79
Vested (in dollars per share) \| $ / shares	15.05
Ending balance (in dollars per share) \| $ / shares	$ 13.12

Stock-Based Compensation (Restricted Stock Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Number of Shares
Vesting Period			4 years
Stock-based compensation expense	$ 4,646	$ 6,531	$ 16,188	$ 22,048
Unvested restricted stock awards
Number of Shares
Granted			77
Unrecognized employee stock-based compensation, period for recognition			1 year 6 months 6 days
Granted (in dollars per share)			$ 5.07
Unvested restricted stock awards \| Vesting, Requisite Service Conditions [Member]
Number of Shares
Unrecognized employee stock-based compensation	$ 3,200		$ 3,200
Fair value of restricted stock unit			$ 1,500

Stock-Based Compensation (Restricted Stock Units Activity) (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Number of Shares
Granted (usd per share)	$ 4.20
Restricted Stock Units (RSUs)
Number of Shares
Beginning balance \| shares	2,903
Granted \| shares	3,030
Canceled \| shares	(722)
Vested \| shares	(718)
Ending balance \| shares	4,493
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 13.63
Granted (in dollars per share)	5.76
Canceled (in dollars per share)	11.61
Vested (in dollars per share)	14.18
Ending balance (in dollars per share)	$ 8.56

Stock-Based Compensation (Restricted Stock Units Narrative) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares
Unvested restricted stock awards
Number of Shares
Unrecognized employee stock-based compensation, period for recognition	1 year 6 months 6 days
Grant date fair value \| $ / shares	$ 5.07
Restricted Stock Units (RSUs)
Number of Shares
Unrecognized employee stock-based compensation \| $	$ 28.0
Grant date fair value \| $ / shares	$ 5.76
Fair value of restricted stock unit \| $	$ 4.1
Intrinsic value of nonvested unit \| $	$ 17.4
Employee Service Share-Based Compensation, Non-Vested Restricted Stock Units, Compensation Cost Not Yet Recognized, Period for Recognition	3 years 7 days
Restricted Stock Units (RSUs) \| Weighted Average Grant Date Value Per Share
Number of Shares
Grant date fair value \| $ / shares	$ 5.76

Stock-Based Compensation (Employee Stock Purchase Plan Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Number of Shares
Stock-based compensation expense	$ 4,646	$ 6,531	$ 16,188	$ 22,048
2014 Employee Stock Purchase Plan \| Employee Stock
Number of Shares
Maximum employee subscription rate	10.00%		10.00%
Purchase price of common stock, percent			85.00%
Number of shares reserved	1,569,188		1,569,188

(Employee Stock Purchase Plan Using the Black-Scholes Model) (Details) - Stock Option	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Number of Shares
Expected term (in years)	5 years 3 months	5 years 9 months 4 days	5 years 10 months 24 days
Risk-free interest rate (in percentage)	1.88%	2.03%	1.43%
Expected volatility (in percentage)	62.00%	57.00%	48.00%
Dividend yield (in percentage)	0.00%	0.00%	0.00%

Stock-Based Compensation (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 4,646	$ 6,531	$ 16,188	$ 22,048
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	115	91	295	261
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,115	2,054	3,524	6,711
Technology and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,122	1,287	3,178	4,461
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,294	3,099	7,631	10,615
Restructuring and other exit costs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 0	$ 0	$ 1,560	$ 0

Restructuring and Other Exit Costs - Schedule of Restructuring and Other Exit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Accrued restructuring and other exit costs at December 31, 2016			$ 801
Restructuring and other exit costs	$ 0	$ 0	5,959	$ 0
Cash paid for restructuring and other exit costs			(4,965)
Non-cash stock-based compensation for restructuring and other exit costs			(1,560)
Accrued restructuring and other exit costs at September 30, 2017	$ 235		235
Restructuring and other exit costs
Employee termination costs			5,100
Facility closing costs			$ 900

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Benefit for income taxes	$ (2,031)	$ (5,557)	$ (1,510)	$ (4,981)

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Rental expense	$ 3.1	$ 3.0	$ 9.4	$ 8.3
Rent expense for sublease rentals	0.8	$ 1.3	3.6	$ 4.3
Purchase obligations	0.8		0.8
Office Lease \| Financial Standby Letter of Credit
Other Commitments [Line Items]
Letters of credit outstanding, amount	$ 2.9		$ 2.9