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Selected Balance Sheet Information (Schedule of Accrued Expenses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Selected Balance Sheet Information [Abstract]    
Clinical trial and other professional fees $ 1,638 $ 1,690
Bonuses 1,628 794
Paid time off 723 552
Interest payable 451 356
Other 537 191
Total accrued expenses $ 4,977 $ 3,583