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Supplemental Balance Sheet Information - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Supplemental Balance Sheet Information [Abstract] |  |
Prepaid clinical, contract research and manufacturing costs | $ 2,133 | $ 2,336
Interest receivable | 27 | 161
Prepaid insurance | 40 | 694
Other | 1,109 | 1,040
Prepaid expenses and other current assets | $ 3,309 | $ 4,231

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