Earnings per share - Earnings per share, basic and diluted (Details) - $ / shares	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Ordinary Shares
Earnings per share [line items]
Basic earnings (loss) per share (USD per share)	$ 0.8778	$ (0.1310)	$ 0.3757
Diluted earnings (loss) per share (USD per share)	0.8585	(0.1310)	0.3733
American Depositary Share
Earnings per share [line items]
Basic earnings (loss) per share (USD per share)	5.27	(0.79)	2.25
Diluted earnings (loss) per share (USD per share)	$ 5.15	$ (0.79)	$ 2.24

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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