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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued Expenses    
External research and development $ 2,794 $ 11,060
Personnel related 5,145 2,013
Professional and consulting services 491 481
Other 321 178
Total accrued expenses $ 8,751 $ 13,732