Income Taxes - Effective Tax Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effective tax rates differing from U.S. federal statutory rate
Tax benefit at the U.S. federal statutory rate	$ (56,299)	$ (39,844)	$ (91,251)
State and local income taxes, net of federal benefit	$ (8,053)	$ (21,613)	$ (13,492)
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration]	country:CA, country:IL, stpr:NJ, stpr:NY	country:CA, country:IL, stpr:NJ, stpr:NY	country:CA, country:IL, stpr:NJ, stpr:NY
Foreign tax effects	$ 334	$ (25)	$ (106)
Tax credits:
Research and development credits	(2,020)	(17,621)	(10,837)
Changes in valuation allowance	101,513	108,179	116,562
Nontaxable or nondeductible Items:
Stock-based compensation	(133,410)	(62,969)	(6,422)
Nondeductible officers' compensation	33,202	31,718	8,651
Acquisition costs			563
Meals & entertainment	3,646
Other	961
Nondeductible meals and other		2,870	(3,397)
Other adjustments:
Other	196
(Benefit) provision for income taxes	$ (59,929)	$ 695	$ 271
Tax provision at the U.S. federal statutory rate (as a percent)	21.00%	21.00%	21.00%
State and local income taxes, net of federal benefit (as a percent)	3.00%	11.39%	3.10%
Foreign tax effects (as a percent)	(0.12%)	0.01%	0.02%
Tax Credits:
Research and development credits (as a percent)	0.75%	9.29%	2.49%
Changes in Valuation Allowance (as a percent)	(37.87%)	(57.02%)	(26.82%)
Nontaxable or Nondeductible Items:
Stock-based compensation (as a percent)	49.76%	33.19%	1.48%
Nondeductible officers' compensation (as a percent)	(12.38%)	(16.72%)	(1.99%)
Acquisition costs (as a percent)			(0.13%)
Meals & entertainment (as a percent)	(1.36%)	(1.51%)	0.79%
Other (as a percent)	(0.36%)
Other Adjustments:
Other (as a percent)	(0.07%)
Benefit (provision) for income taxes (as a percent)	22.35%	(0.37%)	(0.05%)
Federal deferred tax benefit	$ 51,700
State deferred tax benefit	9,000
Foreign tax withholding	200
State income tax expense	$ 600