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Summary of significant accounting policies - Share-Based Payment (Details)	12 Months Ended
	Dec. 31, 2022
Stock option plans
Disclosure Of Detailed Information About Share-Based Payment [Line Items]
Option vesting period (in years)	4 years
Restricted share plans
Disclosure Of Detailed Information About Share-Based Payment [Line Items]
Award vesting period (in years)	3 years

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- Definition

Disclosure Of Detailed Information About Share-Based Payment

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- Definition

Option vesting period.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Period

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