Facility Lease - Lease cost (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Operating lease cost | |||
| Operating lease costs | $ 1,046 | $ 957 | $ 960 |
| Costs of non-lease components (previously common area maintenance) | 396 | 351 | 324 |
| Total operating lease cost | 1,442 | 1,308 | 1,284 |
| Other Information | |||
| Operating cash flows used for operating lease | $ 1,645 | $ 1,506 | $ 1,449 |
| Remaining lease term | 3 years 1 month 6 days | 2 years 1 month 6 days | 3 years 1 month 6 days |
| Discount rate | 8.00% | 10.00% | 10.00% |