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Share-based payments - Share options (Details)
12 Months Ended
Nov. 16, 2023
Options
Sep. 08, 2023
Options
Jun. 12, 2023
Options
Mar. 22, 2023
Options
Dec. 20, 2022
Options
Aug. 15, 2022
Options
May 20, 2020
Options
Dec. 31, 2023
Options
EquityInstruments
shares
Dec. 31, 2022
Options
EquityInstruments
Share-based payments                  
Number of share options issued 14,300 7,650 23,450 13,900 4,000 25,200   59,300 29,200
Number of each option granted to purchase common shares | shares               1  
Share Option Plan                  
Share-based payments                  
Number of share options issued             2,778,173    
Number of trading shares preceding the date the share option granted | EquityInstruments               1,474,809 1,511,773
Number of trading days preceding the date the share option granted               5 days  
Maximum term of share options granted               10 years  
Maximum period of share options vested               4 years