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Composition of Certain Financial Statement Captions - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts Payable and Accrued Expenses [Abstract] |  |
Accounts payable | $ 2,611 | $ 789
Accrued payroll and bonus | 781 | 738
Accrued professional fees | 189 | 276
Accrued vacation and compensation | $ 252 | 245
Finance lease obligation -- current |  | $ 10
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Accounts payable and accrued expenses, Total | Accounts payable and accrued expenses, Total
Other current liabilities | $ 122 | $ 23
Accrued R&D studies | 196 |
Accounts payable and accrued expenses, Total | $ 4,151 | $ 2,081

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