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Stock-based compensation - Summary of incentive plan for members of the Board of Directors (Details) - Directors - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward    
Non-vested at beginning of period 0 0
Granted 24,279 39,104
Vested (24,279) (39,104)
Forfeited 0 0
Non-vested at end of period 0 0
Weighted-Average Grant Date Fair Value    
Non-vested at beginning of period $ 0 $ 0
Granted 89.22 55.30
Vested 89.22 55.30
Forfeited 0 0
Non-vested at end of period $ 0 $ 0