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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Expenses and Other Current Liabilities    
Accrued manufacturing and clinical expenses $ 1,887 $ 462
Accrued board of director compensation 120 4
Accrued bonus 1,007 750
Accrued payroll and employee benefits 407 250
Accrued professional fees 629 806
Accrued other 354 265
Total $ 4,404 $ 2,537