Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net revenue	$ 127,967	$ 108,891	$ 371,205	$ 557,349
Costs of revenue	37,835	36,383	117,559	311,068
Gross profit	90,132	72,508	253,646	246,281
Operating expenses (benefit):
Compensation and benefits	100,964	102,433	299,120	350,592
Technology	16,317	13,930	44,204	41,674
Professional services	4,759	4,197	13,437	14,507
Occupancy	1,178	1,074	3,476	3,285
Depreciation and amortization	4,448	3,108	11,941	7,582
Marketing and advertising	582	346	1,688	1,348
Other operating expenses	4,115	3,833	11,438	14,171
Executive chairman long-term performance award	0	13,413	(144,617)	39,801
Total operating expenses	132,363	142,334	240,687	472,960
(Loss) income from operations	(42,231)	(69,826)	12,959	(226,679)
Other income, net	13,703	15,074	41,845	37,508
(Loss) income before income tax expense	(28,528)	(54,752)	54,804	(189,171)
Income tax expense (benefit)	115	238	399	(6,584)
Net (loss) income	(28,643)	(54,990)	54,405	(182,587)
Other comprehensive income (loss), net of taxes:
Change in foreign currency translation adjustment	125	(200)	(72)	(81)
Net change in unrealized (loss) gain on short-term investments	1,981	(162)	143	5,480
Net other comprehensive income (loss)	2,106	(362)	71	5,399
Comprehensive (loss) income	$ (26,537)	$ (55,352)	$ 54,476	$ (177,188)
Net (loss) income per share attributable to Class A and Class B common stockholders
Basic (in dollars per share)	$ (0.06)	$ (0.10)	$ 0.11	$ (0.34)
Diluted (in dollars per share)	$ (0.06)	$ (0.10)	$ 0.10	$ (0.34)
Weighted-average shares used in computing net (loss) income per share attributable to Class A and Class B common stockholders
Basic (in shares)	507,160,000	529,489,000	513,678,000	535,797,000
Diluted (in shares)	507,160,000	529,489,000	522,394,000	535,797,000