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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accrued employee compensation and benefits $ 5,596 $ 3,513
Accrued tenant improvements 13 2,385
Accrued external research and development expenses 3,079 2,146
Accrued professional fees 495 979
Other 379 138
Total $ 9,562 $ 9,161