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Accrued Expenses - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Compensation and benefits $ 799 $ 976
Research and development expenses 734 212
Leasehold Improvements 320 0
Legal and professional fees 75 326
Other 70 57
Total accrued expenses $ 1,998 $ 1,571