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Share-based payments - Weighted average assumptions to estimate the fair value of the share options granted (Details) - Employee Stock Option - $ / shares	Jun. 13, 2025	May 20, 2025	Mar. 19, 2025
Share-based payments
Exercise price	$ 8.78	$ 6.28	$ 9.87
Expected volatility	69.00%	68.00%	68.00%
Expected life of options	6 years	6 years	6 years
Risk-free interest rate	3.06%	2.98%	2.85%

X

- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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