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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%