Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accrued Expenses
Accrued payroll and employee benefits	$ 11,568	$ 9,348
Accrued research and development contract costs	20,544	10,864
Accrued professional fees	1,392	1,439
Other accrued expenses	338	378
Accrued expenses	$ 33,842	$ 22,029