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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accrued Expenses    
External research and development $ 4,987 $ 2,794
Personnel related 1,483 5,145
Professional and consulting services 659 491
Other 194 321
Total accrued expenses $ 7,323 $ 8,751