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Commitments and contingencies - Components of lease expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Commitments and contingencies |  |  |  |
Operating lease cost | $ 1,355 | $ 1,364 | $ 4,034 | $ 4,057
Variable lease cost | 760 | 566 | 2,104 | 2,017
Total lease cost | $ 2,115 | $ 1,930 | $ 6,138 | $ 6,074
Weighted-average remaining operating lease term (years) | 2 years 2 months 12 days | 3 years 2 months 12 days | 2 years 2 months 12 days | 3 years 2 months 12 days
weighted average operating lease discount rate | 7.80% | 7.90% | 7.80% | 7.90%
Weighted average remaining finance lease term (years) | 5 years |  | 5 years |
Weighted average finance lease discount rate | 9.50% |  | 9.50% |

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