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Leases (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) ft²
Leases |  |  |  |
Lease to eliminate square feet | ft² |  |  |  | 16,200
Renewal term (in years) |  |  |  | 5 years
Lease, remaining square feet | ft² |  |  |  | 33,400
Lease liabilities | $ 3,042 |  |  |
Right-of-use assets | 2,970 | $ 3,449 |  |
Operating lease expense | 1,900 | 2,300 | $ 2,500 |
Variable lease expense | 700 | 1,200 | $ 1,500 |
Operating lease payments | $ 1,800 | $ 2,400 |  |
Weighted-average remaining lease term | 2 years | 2 years |  |
Weighted-average discount rate | 10.00% | 10.40% |  |
Minimum |  |  |  |
Leases |  |  |  |
Term of lease (in years) | 1 year |  |  |
Maximum |  |  |  |
Leases |  |  |  |
Term of lease (in years) | 4 years |  |  |
ASC 842 |  |  |  |
Leases |  |  |  |
Term of lease (in years) |  |  |  | 3 years
Lease liabilities | $ 1,000 | $ 1,900 |  | $ 1,400
Right-of-use assets | $ 1,000 | $ 1,900 |  |

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