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Share-based compensation - Employee Share Purchase Plan (Details) - Employee share purchase plan (ESPP) - Employee Stock - shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2018
Share-based compensation        
Number of shares issued 11,242 4,724 6,181  
Ordinary shares available for issue 116,060     150,000