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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accrued Liabilities, Current [Abstract]    
Research and development $ 376 $ 866
Clinical 228 703
Professional fees 1,490 747
Employee-related 1,049 1,716
Other 394 293
Total accrued expenses $ 3,537 $ 4,325