CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 101,332	$ 129,561	$ 306,515	$ 392,323
Costs, expenses and other:
Cost of revenue	31,980	43,681	105,964	138,297
Sales and marketing	32,118	49,448	93,312	167,563
General and administrative	30,448	32,171	70,065	92,152
Product development	35,575	44,744	94,933	156,568
Impairment of goodwill	11,895	0	11,895	0
Restructuring costs	2,097	7,111	15,999	17,949
Gain on divestiture	0	0	(17,591)	0
Amortization of purchased intangible assets	894	920	2,644	2,742
Total costs, expenses and other	145,007	178,075	377,221	575,271
Loss from operations	(43,675)	(48,514)	(70,706)	(182,948)
Other income (expense), net:
Interest income (expense), net	1,068	401	3,005	(1,713)
Other (expense) income, net	(10,164)	5,114	9,391	1,908
Total other (expense) income	(9,096)	5,515	12,396	195
Loss before provision for income taxes	(52,771)	(42,999)	(58,310)	(182,753)
Provision for income taxes	541	249	1,600	1,270
Net loss	$ (53,312)	$ (43,248)	$ (59,910)	$ (184,023)
Net loss per share of common stock:
Basic (in dollars per share)	$ (0.68)	$ (0.56)	$ (0.78)	$ (2.39)
Diluted (in dollars per share)	$ (0.68)	$ (0.56)	$ (0.78)	$ (2.39)
Weighted average shares outstanding:
Basic (in shares)	78,005,210	77,784,346	76,902,316	76,969,629
Diluted (in shares)	78,005,210	77,784,346	76,902,316	76,969,629