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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
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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

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