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Supplemental Balance Sheet Information - Accrued Expense and Other Current Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Supplemental Balance Sheet Information [Abstract] |  |
Accrued payroll-related expenses | $ 706 | $ 920
Accrued legal expenses | 362 | 254
Operating lease liability | 196 | 292
Common stock warrant liability | 257 | 0
Accrued clinical, contract research and manufacturing costs | 303 | 515
Accrued other expenses | 123 | 454
Accrued expenses and other current liabilities | $ 1,947 | $ 2,435

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