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Earnings/(loss) per share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Description of conversion ratio	On February 8, 2019 the Company announced a change in the ratio of its American Depositary Receipts (ADRs) to ordinary shares, from 1 ADR representing 1 share to 1 ADR representing 5 shares.

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Description of conversion ratio.

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