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Share-based compensation - Assumptions used in the Black Scholes option pricing model to determine the fair value of share options (Details) - Stock option - Employees and directors - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based compensation.
Risk-free interest rate	4.00%	4.00%	2.20%
Expected volatility	77.00%	82.90%	82.50%
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years
Unrecognized compensation expense
Total unrecognized compensation expense related to the unvested employee and director	$ 48.3
Unrecognized compensation cost expected to be recognized over a weighted average period	2 years 4 months 24 days

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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