Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net revenue	$ 186,678	$ 122,266	$ 352,780	$ 230,249
Costs of revenue	108,629	75,291	200,005	133,417
Gross profit	78,049	46,975	152,775	96,832
Operating expenses:
Compensation and benefits	97,868	97,755	198,216	144,658
Technology	13,154	7,569	24,538	13,195
Professional services	5,794	3,831	10,564	8,028
Occupancy	1,148	907	2,263	1,993
Depreciation and amortization	921	874	1,900	1,781
Marketing and advertising	886	495	1,445	990
Other operating expenses	4,995	3,530	9,838	4,825
Total operating expenses	124,766	114,961	248,764	175,470
Loss from operations	(46,717)	(67,986)	(95,989)	(78,638)
Other income (expense), net	1,802	(481)	(9,875)	(2,648)
Loss before income tax expense	(44,915)	(68,467)	(105,864)	(81,286)
Income tax expense (benefit)	(227)	87	(578)	106
Net loss	(44,688)	(68,554)	(105,286)	(81,392)
Other comprehensive income (loss), net of taxes:
Change in foreign currency translation adjustment	(181)	(12)	(200)	(26)
Net change in unrealized gain (loss) on marketable securities	(1,896)	(56)	(7,763)	(87)
Net other comprehensive income (loss)	(2,077)	(68)	(7,963)	(113)
Comprehensive loss	$ (46,765)	$ (68,622)	$ (113,249)	$ (81,505)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.08)	$ (0.29)	$ (0.19)	$ (0.44)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.08)	$ (0.29)	$ (0.19)	$ (0.44)
Weighted-average shares used in computing net loss per share attributable to common stockholders - basic (in shares)	544,704,146	234,669,664	543,524,008	183,784,697
Weighted-average shares used in computing net loss per share attributable to common stockholders - diluted (in shares)	544,704,146	234,669,664	543,524,008	183,784,697