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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accrued Expenses    
Accrued clinical and regulatory $ 2,049 $ 1,236
Accrued contract manufacturing cost 2,176 1,482
Accrued compensation 1,218 1,027
Accrued research and development-other 444 435
Total accrued expenses $ 5,887 $ 4,180