Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 3,617	$ 32,148
Research and development tax credit carryforwards	2,706	7,679
Intangible assets	2,326	1,142
Capitalized research and development expenses	32,803	15,747
Deferred revenue	36,726	0
Lease liability	22,581	7,031
Stock compensation	1,709	1,109
Other	0	34
Total deferred tax assets	102,468	64,890
Deferred tax liabilities:
Property and equipment	(2,044)	(298)
Right-of-use asset	(22,237)	(6,869)
Prepaid expenses	(281)	(304)
Total deferred tax liabilities	(24,562)	(7,471)
Valuation allowance	(77,906)	(57,419)
Net deferred tax assets	$ 0	$ 0