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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued compensation $ 1,018 $ 1,719
Accrued contracted research costs 790 1,726
Accrued professional fees 663 356
Accrued other 180  
Accrued severance 63 396
Total $ 2,714 $ 4,197