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Share-based payments - Weighted average assumptions to estimate the fair value of the share options granted (Details) - Employee Stock Option - $ / shares
Jun. 13, 2025
May 20, 2025
Mar. 19, 2025
Share-based payments      
Exercise price $ 8.78 $ 6.28 $ 9.87
Expected volatility 69.00% 68.00% 68.00%
Expected life of options 6 years 6 years 6 years
Risk-free interest rate 3.06% 2.98% 2.85%