Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accrued Expenses
Accrued contracted costs	$ 2,818	$ 2,822
Accrued compensation	974	3,373
Accrued professional fees	955	588
Accrued other	409	407
Accrued milestones		500
Total	$ 5,156	$ 7,690