Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Prepaid Expense And Other Assets Current [Abstract] | ||
| Prepaid research and development-related expenses | $ 2,672 | $ 2,584 |
| Net contract asset | 1,385 | 0 |
| Collaboration receivable | 688 | 0 |
| Prepaid insurance | 1,769 | 1,480 |
| Interest and other receivables | 292 | 0 |
| Other | 866 | 268 |
| Total prepaid expenses and other current assets | $ 7,672 | $ 4,332 |