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Composition of Certain Financial Statement Captions - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts Payable and Accrued Expenses [Abstract]    
Accounts payable $ 789 $ 327
Accrued payroll and bonus 738 679
Accrued professional fees 276 332
Accrued vacation and compensation 245 166
Finance lease obligation - current 10 120
Other current liabilities 23 6
Accrued expenses   791
Accrued R&D studies   858
Accounts payable and accrued expenses, Total $ 2,081 $ 3,279