Share based compensation - Fair value of RSUs granted estimated Using binomial model (Details) - $ / shares	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share based compensation
Risk-free rate of return, minimum	4.09%	4.48%	3.79%
Risk-free rate of return, maximum	4.58%	4.69%	3.88%
Volatility, minimum	46.39%	47.09%	44.37%
Volatility, maximum	47.34%	47.34%	44.95%
Expected dividend yield	0.00%	0.00%	0.00%
Expected terms	10 years	10 years	10 years
2021 Option Plan
Share based compensation
Expected dividend yield	0.00%
Minimum
Share based compensation
Risk-free rate of return	1.38%
Issuance price (in USD per share)	$ 1.57	$ 1.14	$ 3.16
Maximum
Share based compensation
Risk-free rate of return	3.55%
Issuance price (in USD per share)	$ 2.11	$ 1.84	$ 8.02
RSU \| Share Incentive Plan, 2022
Share based compensation
Risk-free rate of return, minimum	3.94%		2.65%
Risk-free rate of return, maximum	3.95%		4.25%
Risk-free rate of return		4.06%
Volatility, minimum	47.57%		44.58%
Volatility, maximum	47.65%		44.73%
Volatility rate		44.56%
Expected dividend yield	0.00%	0.00%	0.00%
Expected terms	10 years	10 years	10 years
RSU \| Minimum \| Share Incentive Plan, 2022
Share based compensation
Issuance price (in USD per share)	$ 1.72	$ 0.96	$ 3.68
RSU \| Maximum \| Share Incentive Plan, 2022
Share based compensation
Issuance price (in USD per share)	$ 2.50	$ 1.60	$ 6.91
Performance Shares
Share based compensation
Risk-free rate of return		4.26%
Volatility rate		43.25%
Expected dividend yield		0.00%
Issuance price (in USD per share)		$ 1.69
Expected terms		10 years

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the maximum 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 estimated measure of the minimum 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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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

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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