Consolidated Statements of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 231,698	$ 278,678	$ 335,046
Costs and operating expenses:
Cost of revenue	22,239	21,549	27,828
Sales and marketing	136,479	151,915	226,977
Technology and development	41,432	44,930	56,114
General and administrative	48,747	49,989	64,318
Depreciation and amortization	16,279	20,547	20,665
Goodwill impairment	0	8,264	0
Total costs and operating expenses	265,176	297,194	395,902
Loss from operations	(33,478)	(18,516)	(60,856)
Interest income	52	462	2,480
Other income	667	198	0
Loss from equity method investment	(5,404)	(1,989)	(1,280)
Loss from continuing operations before income taxes	(38,163)	(19,845)	(59,656)
Provision for (benefit from) income taxes	206	(6)	(1,321)
Loss from continuing operations	(38,369)	(19,839)	(58,335)
Income from discontinued operations, net of taxes	40	96,383	3,445
Net (loss) income	$ (38,329)	$ 76,544	$ (54,890)
(Loss) income per share, basic and diluted
Continuing operations (in dollars per share)	$ (0.39)	$ (0.19)	$ (0.55)
Discontinued operations (in dollars per share)	$ 0	$ 0.91	$ 0.03
Weighted average common shares outstanding, basic and diluted	97,352	106,315	105,805
Other comprehensive income (loss):
Comprehensive (loss) income	$ (38,329)	$ 76,544	$ (54,890)