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Share-based compensation - Employee Share Purchase Plan (Details) - Employee share purchase plan (ESPP) - Employee Stock - shares
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2018
Share-based compensation      
Number of shares issued 0 2,495  
Ordinary shares available for issue 96,862 113,565 150,000