Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accrued Expenses
Accrued contracted costs	$ 2,073	$ 760
Accrued compensation	713	1,958
Accrued professional fees	638	268
Accrued other	428	295
Total	$ 3,852	$ 3,281