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Financial instruments and financial risk management - License agreement (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended
Oct. 31, 2023
Jun. 30, 2024
AgomAb | Preferred Class C Shares    
Financial instruments and financial risk management    
Proceeds from issue of shares $ 100  
Zai Lab    
Financial instruments and financial risk management    
Number of equity instruments obtained   568,182
Price of equity instrument   $ 132