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Accrued Expenses - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Compensation and benefits $ 572 $ 976
Research and development expenses 356 212
Legal and professional fees 0 326
Other 246 57
Total accrued expenses $ 1,174 $ 1,571