Leases - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Assets: | ||
| Operating lease assets | $ 203 | $ 288 |
| Liabilities: | ||
| Current portion of lease liabilities | 82 | 94 |
| Noncurrent lease liabilities | 153 | 236 |
| Total operating lease liabilities | $ 235 | $ 330 |