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Composition of Certain Financial Statement Captions - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accounts Payable and Accrued Expenses [Abstract] |  |
Accrued expenses | $ 791 | $ 824
Accounts payable | 327 | 721
Accrued payroll and bonus | 679 | 423
Accrued professional fees | 332 | 186
Accrued vacation and compensation | 166 | 192
Accrued R&D studies | 858 | 230
Finance lease obligation - current | 120 |
Other current liabilities | 6 | 201
Accounts payable and accrued expenses, Total | $ 3,279 | $ 2,777

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