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Share-based payments - Share options (Details)
6 Months Ended
Jun. 30, 2025
D
shares
Dec. 31, 2024
shares
May 20, 2020
shares
Summary of significant accounting policies      
Number of options outstanding 2,147,568 2,291,152  
Employee Stock Option      
Summary of significant accounting policies      
Number of options outstanding 2,147,568 2,291,152  
Number of shares per option 1    
Number of days prior to grant for volume-weighted average price calculation | D 5    
Employee Stock Option | Maximum      
Summary of significant accounting policies      
Number of shares reserved for future issuance     3,905,175
Term of award (in years) 10 years    
Vesting period (in years) 4 years