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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued external research and development expense $ 8,428 $ 5,387
Accrued payroll and related expenses 7,147 6,663
Accrued professional and consulting expense 1,421 1,141
Accrued other 436 476
Accrued payable for property and equipment 24 1,291
Accrued expenses $ 17,456 $ 14,958