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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

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