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Share-based compensation - Movement of share options outstanding (Details)
12 Months Ended
Dec. 31, 2023
EquityInstruments
$ / shares
Dec. 31, 2022
EquityInstruments
$ / shares
Number of options    
Balance - Beginning of period, Number of options | EquityInstruments 1,812,450 697,841
Granted, Number of options | EquityInstruments 1,202,400 1,245,400
Forfeited, Number of options | EquityInstruments (314,773) (130,791)
Balance - End of period, Number of options | EquityInstruments 2,700,077 1,812,450
Options exercisable - End of period, Number of options | EquityInstruments 735,050 205,229
Weighted average exercise price    
Balance - Beginning of period, Weighted average exercise price | $ / shares $ 11.52 $ 21.21
Granted, Weighted average exercise price | $ / shares 6.59 6.43
Forfeited, Weighted average exercise price | $ / shares 8.86 14.74
Balance - End of period, Weighted average exercise price | $ / shares 9.64 11.52
Options exercisable - End of period, Weighted average exercise price | $ / shares $ 14.18 $ 21.32