Earnings per share - Earnings per share, basic and diluted (Details) - $ / shares	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Ordinary Shares
Earnings per share [line items]
Basic earnings (loss) per share (USD per share)	$ (0.1310)	$ 0.3757	$ (1.0042)
Diluted earnings (loss) per share (USD per share)	(0.1310)	0.3733	(1.0042)
American Depositary Share
Earnings per share [line items]
Basic earnings (loss) per share (USD per share)	(0.79)	2.25	(6.03)
Diluted earnings (loss) per share (USD per share)	$ (0.79)	$ 2.24	$ (6.03)

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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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