Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 619,979	$ 575,080	$ 470,636
Cost of revenue	211,095	189,364	154,563
Gross profit	408,884	385,716	316,073
Operating expenses:
Sales and marketing	263,884	279,281	171,390
Technology and development	70,434	84,003	41,863
General and administrative	116,057	106,584	51,017
Impairment of long-lived and other assets	248	924	1,105
Loss on sale of business	0	0	1,764
Total operating expenses	450,623	470,792	267,139
(Loss) income from operations	(41,739)	(85,076)	48,934
Interest income (expense), net	1,543	(27,984)	(35,504)
Other (expense) income, net	(4,477)	1,193	3,713
Impairment of other equity security	(3,000)	0	0
Loss on debt extinguishment	0	(7,748)	0
Impairment of available-for-sale debt securities of $4,912, net of $94 loss recognized in other comprehensive loss	0	0	(4,818)
(Loss) income before income taxes	(47,673)	(119,615)	12,325
Provision for (benefit from) income taxes	1,060	(10,951)	2,429
Net (loss) income	(48,733)	(108,664)	9,896
Net (loss) income attributable to common stockholders—basic	(48,733)	(108,664)	7,223
Net (loss) income attributable to common stockholders—diluted	$ (48,733)	$ (108,664)	$ 7,262
Net (loss) income per share attributable to common stockholders – basic (in dollars per share)	$ (0.25)	$ (0.67)	$ 0.06
Net (loss) income per share attributable to common stockholders - diluted (in dollars per share)	$ (0.25)	$ (0.67)	$ 0.06
Weighted-average shares used to compute net (loss) income per share attributable to common stockholder - basic (in shares)	195,829,000	161,424,000	124,709,000
Weighted-average shares used to compute net (loss) income per share attributable to common stockholder - diluted (in shares)	195,829,000	161,424,000	127,259,000