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Balance Sheet Components - Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Prepaid and Other Current Assets |  |
Interest receivable | $ 39 | $ 45
Prepaid research and development manufacturing expenses | 149 | 192
Prepaid facility expenses | 196 | 182
Prepaid insurance | 317 | 252
Other | 214 | 102
Total of prepaid and other current assets | $ 915 | $ 773

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