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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Payroll and related costs $ 816 $ 2,133
Clinical and nonclinical trial expenses 3,594 3,229
Professional and consulting fees 550 584
Other 125 126
Total accrued expenses $ 5,085 $ 6,072