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Share-based payments - Option additional information (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Employee Stock Option        
Share-based payments        
Weighted-average grant date fair values of share options $ 4.59 $ 7.01 $ 4.82 $ 7.01