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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- 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 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.

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

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

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No definition available.

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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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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Share-based compensation - Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Stock Option, Target-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options		1 year 6 months
Expected volatility		55.00%
Expected volatility minimum			50.00%
Expected volatility maximum			55.00%
Risk-free interest rates		0.16%
Risk-free interest rates minimum			1.49%
Risk-free interest rates maximum			1.67%
Expected dividend yield		0.00%	0.00%
Weighted-average grant-date fair value (in dollars per share)		$ 8.95	$ 6.02
Employee Stock Option, Target-Based \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options			3 years
Employee Stock Option, Target-Based \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options			3 years 3 months
Employee Stock Option, Service-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options			6 years 3 months
Expected volatility minimum			45.10%
Expected volatility maximum			45.30%
Risk-free interest rates minimum			1.60%
Risk-free interest rates maximum			1.70%
Expected dividend yield			0.00%
Weighted-average grant-date fair value (in dollars per share)			$ 7.29
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options	6 months
Expected volatility	40.31%
Risk-free interest rates	0.06%
Expected dividend yield	0.00%
Weighted-average grant-date fair value (in dollars per share)	$ 11.97