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Share-based compensation - Employee Share Purchase Plan - Narrative (Details) - ESPP - Employee Stock [Member] - shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2018
Share-based compensation      
Number of shares issued 5,890 1,174  
Ordinary shares available for issue 121,414 130,852 150,000