Balance Sheet Details - Accrued Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Payables And Accruals [Abstract] | ||
| Research and development | $ 779 | $ 412 |
| Accrued Clinical Trials | 518 | 980 |
| Legal fees | 154 | 77 |
| Unvested share liability | 10 | |
| Compensation | 1,955 | 1,528 |
| Other | 25 | 35 |
| Total accrued liabilities | $ 3,431 | $ 3,042 |