Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenue	$ 430,302	$ 275,948	$ 192,433
Operating expenses:
Cost of revenue	220,243	107,577	58,725
Selling and marketing	144,307	113,848	84,273
Product and technology	58,502	59,565	47,005
General and administrative	103,192	109,814	84,740
Provision for doubtful accounts	37,180	805	1,055
Impairment loss on intangible assets and goodwill	57,232	61,386	0
Total operating expenses	620,656	452,995	275,798
Operating loss	(190,354)	(177,047)	(83,365)
Other income (expense):
Interest expense	(31,828)	(8,723)	(5,757)
Change in fair value of earnout liability	44	13,822	(18,519)
Change in fair value of private warrant liability	(444)	14,486	(15,389)
Change in fair value of derivatives	(4,261)	0	0
Gain on extinguishment of debt	81,354	0	5,110
Investment income and realized gains, net of investment expenses	8,285	1,174	701
Other income, net	3,893	571	340
Total other income (expense)	57,043	21,330	(33,514)
Loss before income taxes	(133,311)	(155,717)	(116,879)
Income tax benefit (provision)	(622)	(842)	10,273
Net loss	(133,933)	(156,559)	(106,606)
Other comprehensive income (loss):
Change in net unrealized loss, net of tax	2,311	(5,912)	(259)
Comprehensive loss	$ (131,622)	$ (162,471)	$ (106,865)
Net loss per share - basic (in dollars per share)	$ (1.39)	$ (1.61)	$ (1.14)
Net loss per share - diluted (in dollars per share)	$ (1.39)	$ (1.61)	$ (1.14)
Weighted-average shares used in computing net loss attributable per share to common stockholders:
Shares used in computing basic net loss per share (in shares)	96,057,000	97,351,000	93,885,000
Shares used in computing diluted net loss per share (in shares)	96,057,000	97,351,000	93,885,000