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Share-based payments - Estimated the fair value of the share options granted (Details)
12 Months Ended
Nov. 16, 2023
Options
Y
$ / shares
Sep. 08, 2023
Options
Y
$ / shares
Jun. 12, 2023
Options
Y
$ / shares
Mar. 22, 2023
Y
Options
$ / shares
Dec. 20, 2022
Y
Options
$ / shares
Aug. 15, 2022
Y
Options
$ / shares
Dec. 31, 2023
Options
Dec. 31, 2022
Options
Share-based payments                
Exercise price | $ / shares $ 12.41 $ 12.38 $ 19.87 $ 13.39 $ 12.46 $ 9.20    
Expected volatility 70.00% 69.00% 70.00% 70.00% 71.00% 68.00%    
Expected life of options | Y 6 6 6 6 6 6    
Risk-free interest rate 4.16% 3.71% 3.22% 3.38% 2.95% 2.76%    
Number of share options issued | Options 14,300 7,650 23,450 13,900 4,000 25,200 59,300 29,200