Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accrued Expenses and Other Current Liabilities
Accrued manufacturing expenses	$ 2,221	$ 8,039
Accrued employee compensation and benefits	3,353	3,234
Accrued external research and development expenses	1,648	2,507
Accrued professional fees	1,274	983
Other	244	87
Total	$ 8,740	$ 14,850