Condensed Consolidated Statements of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 65,766	$ 58,554	$ 130,871	$ 137,471
Costs and operating expenses:
Cost of revenue (exclusive of depreciation and amortization presented separately below)	5,746	5,564	11,204	11,739
Sales and marketing	37,476	33,032	77,575	79,112
Technology and development	10,780	12,800	21,973	24,699
General and administrative	13,853	12,849	26,531	24,937
Depreciation and amortization	4,591	5,175	8,903	10,204
Goodwill impairment	0	0	0	8,264
Total costs and operating expenses	72,446	69,420	146,186	158,955
Loss from operations	(6,680)	(10,866)	(15,315)	(21,484)
Interest income	13	61	28	439
Other income	42	0	667	0
Loss from equity method investment	(357)	(507)	(686)	(889)
Loss from continuing operations before income taxes	(6,982)	(11,312)	(15,306)	(21,934)
Provision for (benefit from) income taxes	133	62	227	(170)
Loss from continuing operations	(7,115)	(11,374)	(15,533)	(21,764)
(Loss) income from discontinued operations, net of taxes	(168)	132	(168)	(147)
Net loss	$ (7,283)	$ (11,242)	$ (15,701)	$ (21,911)
(Loss) income per share, basic and diluted
Continuing operations, basic (in dollars per share)	$ (0.07)	$ (0.11)	$ (0.16)	$ (0.20)
Continuing operations, diluted (in dollars per share)	(0.07)	(0.11)	(0.16)	(0.20)
Discontinuing operations, basic (in dollars per share)	0.00	0.00	(0.00)	0.00
Discontinuing operations, diluted (in dollars per share)	$ 0.00	$ 0.00	$ (0.00)	$ 0.00
Weighted average common shares outstanding, basic (in shares)	98,810	107,535	98,696	107,279
Weighted average common shares outstanding, diluted (in shares)	98,810	107,535	98,696	107,279
Other comprehensive loss:
Comprehensive loss	$ (7,283)	$ (11,242)	$ (15,701)	$ (21,911)