Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net revenue	$ 125,270	$ 231,115	$ 243,237	$ 448,456
Costs of revenue	45,917	146,506	79,725	274,685
Gross profit	79,353	84,609	163,512	173,771
Operating (benefit) expenses:
Compensation and benefits	103,166	113,521	198,156	248,159
Technology	14,769	13,154	27,887	27,744
Professional services	4,808	4,873	8,678	10,310
Occupancy	1,204	1,057	2,298	2,211
Depreciation and amortization	3,956	2,494	7,493	4,474
Marketing and advertising	728	561	1,106	1,002
Other operating expenses	3,418	5,103	7,322	10,336
Executive chairman long-term performance award	(157,738)	13,267	(144,617)	26,388
Total operating (benefit) expenses	(25,689)	154,030	108,323	330,624
Income (loss) from operations	105,042	(69,421)	55,189	(156,853)
Other income, net	14,216	10,762	28,143	22,434
Income (loss) before income tax expense	119,258	(58,659)	83,332	(134,419)
Income tax expense (benefit)	150	138	284	(6,821)
Net income (loss)	119,108	(58,797)	83,048	(127,598)
Other comprehensive income (loss), net of taxes:
Change in foreign currency translation adjustment	(85)	100	(197)	119
Net change in unrealized (loss) gain on short-term investments	(364)	1,607	(1,838)	5,642
Net other comprehensive (loss) income	(449)	1,707	(2,035)	5,761
Comprehensive income (loss)	$ 118,659	$ (57,090)	$ 81,013	$ (121,837)
Net income (loss) per share attributable to Class A and Class B common stockholders
Basic (in dollars per share)	$ 0.23	$ (0.11)	$ 0.16	$ (0.24)
Diluted (in dollars per share)	$ 0.23	$ (0.11)	$ 0.16	$ (0.24)
Weighted-average shares used in computing net income (loss) per share attributable to Class A and Class B common stockholders
Basic (in shares)	515,959,000	538,267,000	516,973,000	538,989,000
Diluted (in shares)	524,401,000	538,267,000	525,415,000	538,989,000