Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accrued Liabilities [Abstract]
Accrued external research, development and manufacturing costs	$ 19,234	$ 28,151
Accrued professional and consultant fees	2,135	1,732
Accrued employee compensation	2,799	10,752
Accrued inventory	2,058	0
Other	596	225
Accrued expenses	$ 26,822	$ 40,860