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Share-based payments - Option additional information (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Employee Stock Option
Share-based payments
Weighted-average grant date fair values of share options	$ 4.59	$ 7.01	$ 4.82	$ 7.01

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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