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Fixed Assets - Additional information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Leases |  |
Depreciation expense | $ 7 | $ 8
Interest on future minimum payments | 56 |
Seattle and Tulsa |  |
Leases |  |
Estimated restoration cost |  | $ 32
Monthly rent expense | 24 |
CHINA |  |
Leases |  |
Monthly rent expense | $ 5 |
Minimum [Member] | Seattle and Tulsa |  |
Leases |  |
Remaining term (in years) | 1 year |
Annual rent expense, increase (in percent) | 2.00% |
Agreement expiration term (in years) | 12 months |
Maximum [Member] | Seattle and Tulsa |  |
Leases |  |
Remaining term (in years) | 6 years |
Annual rent expense, increase (in percent) | 3.00% |
Agreement expiration term (in years) | 6 years |

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