Facility Lease - Minimum rental commitments (Details) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Minimum rental commitments | ||
| 2022 | $ 1,300 | $ 1,260 |
| 2023 | 1,391 | 1,299 |
| 2024 | 1,434 | |
| Total lease payments | 4,125 | 2,559 |
| Less: imputed interest | (478) | (249) |
| Total | $ 3,647 | $ 2,310 |