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Share-based compensation - Movement of share options outstanding (Details) | 12 Months Ended
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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

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