Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net revenue	$ 748,206	$ 517,175	$ 290,292
Costs of revenue	428,205	285,470	172,385
Gross profit	320,001	231,705	117,907
Operating expenses:
Compensation and benefits	415,094	318,116	129,802
Technology	52,361	33,637	13,239
Professional services	23,479	18,443	7,188
Occupancy	4,514	4,181	4,337
Depreciation and amortization	3,853	3,534	3,498
Marketing and advertising	3,995	2,284	1,670
Other operating expenses	26,513	13,516	5,260
Total operating expenses	529,809	393,711	164,994
Loss from operations	(209,808)	(162,006)	(47,087)
Other income (expense), net	24,926	(2,563)	(521)
Loss before income tax expense	(184,882)	(164,569)	(47,608)
Income tax expense (benefit)	(102)	(640)	87
Net loss	(184,780)	(163,929)	(47,695)
Net loss attributable to common stockholders	(184,780)	(163,929)	(47,695)
Other comprehensive income (loss), net of taxes:
Change in foreign currency translation adjustment	(167)	(14)	(64)
Change in unrealized gain (loss) on marketable securities	(4,840)	(2,241)	43
Change in accumulated other comprehensive income (loss)	(5,007)	(2,255)	(21)
Comprehensive loss	$ (189,787)	$ (166,184)	$ (47,716)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.34)	$ (0.45)	$ (0.39)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.34)	$ (0.45)	$ (0.39)
Weighted-average shares used in computing net loss per share attributable to common stockholders - Basic (in shares)	545,397,254	362,756,466	122,932,556
Weighted-average shares used in computing net loss per share attributable to common stockholders - Diluted (in shares)	545,397,254	362,756,466	122,932,556
Net Income (Loss) Available to Common Stockholders, Diluted	$ (184,780)	$ (163,929)	$ (47,695)