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Earnings/(loss) per share - Additional Information (Detail) | 12 Months Ended
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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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- Definition Description of conversion ratio. + References No definition available. + Details
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