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Supplemental Balance Sheet Information - Accrued Expense and Other Current Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Supplemental Balance Sheet Information [Abstract] |  |
Accrued clinical, contract research and manufacturing costs | $ 0 | $ 48
Accrued restructuring costs | 0 | 48
Lease liability | 580 | 539
Accrued payroll-related expenses | 16 | 32
Accrued federal and state tax payable | 0 | 209
Accrued other expenses | 492 | 402
Accrued expenses and other current liabilities | $ 1,088 | $ 1,278

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