Income Tax - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Federal and state net operating losses	$ 50,498	$ 33,497
Research and development credits	27,729	77
Property and equipment	586	205
Accruals and other	9,016	20,884
Share-based compensation	10,484	14,490
Research and development capitalization expenditures	36,743	23,404
Reserve for contract contingencies and processing errors	951	614
Deferred revenue	1,018	6,011
Lease liability	2,288	3,061
Total deferred tax assets	139,313	102,243
Less valuation allowance	(128,150)	(98,816)
Total deferred tax assets, net of valuation allowance	11,163	3,427
Deferred tax liabilities
Intangibles	(9,025)	0
Right-of-use asset	(1,643)	(2,220)
Total deferred tax liabilities	(10,668)	(2,220)
Net deferred tax assets	$ 495	$ 1,207