Condensed Consolidated Statements of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues (includes related party contra revenue of $297 and net revenue of $1,247 for the three months ended March 31, 2021 and 2020, respectively)	$ 65,105	$ 78,917
Costs and operating expenses:
Cost of revenue (exclusive of depreciation and amortization presented separately below; includes related party cost of revenue of $1,248 and $285 for the three months ended March 31, 2021 and 2020, respectively)	5,458	6,175
Sales and marketing (includes related party expenses of $0 and $1,959 for the three months ended March 31, 2021 and 2020, respectively)	40,099	46,080
Technology and development	11,193	11,899
General and administrative	12,678	12,088
Depreciation and amortization	4,312	5,029
Goodwill impairment	0	8,264
Total costs and operating expenses	73,740	89,535
Loss from operations	(8,635)	(10,618)
Interest income	15	378
Other income	625	0
Loss from equity method investment	(329)	(382)
Loss from continuing operations before income taxes	(8,324)	(10,622)
Provision for (benefit from) income taxes	94	(232)
Loss from continuing operations	(8,418)	(10,390)
Loss from discontinued operations, net of taxes	0	(279)
Net loss	$ (8,418)	$ (10,669)
Loss per share, basic and diluted
Continuing operations (in dollars per share)	$ (0.09)	$ (0.10)
Discontinuing operations (in dollars per share)	$ 0.00	$ 0.00
Weighted average common shares outstanding, basic and diluted (in shares)	98,581	107,024
Other comprehensive loss:
Comprehensive loss	$ (8,418)	$ (10,669)