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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued Expenses    
Accrued payroll and related expenses $ 6,663 $ 4,380
Accrued external research and development expense 5,387 4,088
Accrued payable for property and equipment 1,291  
Accrued professional and consulting expense 1,141 929
Accrued other 476 213
Accrued expenses $ 14,958 $ 9,610