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Commitments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2019
Operating leases |  |  |
Operating lease liability | $ 400 |  | $ 1,700
Right-of-use asset | 394 | $ 966 | $ 1,700
Estimated incremental borrowing rate |  |  | 7.49%
Future minimum payments | 400 |  |
Rent expense | 700 | 800 |
Lease payments | $ 700 | $ 1,500 |

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