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Basic and diluted earnings per share (Details) - shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Basic and diluted earnings per share |  |  |
Total potential dilutive ordinary shares | 6,458,429 | 3,814,508 | 3,353,797
Employee share purchase plan (ESPP) |  |  |
Basic and diluted earnings per share |  |  |
Total potential dilutive ordinary shares | 1,048 | 1,842 | 560
Stock options |  |  |
Basic and diluted earnings per share |  |  |
Total potential dilutive ordinary shares | 4,237,917 | 2,576,281 | 2,673,279
Non-vested RSUs and PSUs |  |  |
Basic and diluted earnings per share |  |  |
Total potential dilutive ordinary shares | 2,219,464 | 1,236,385 | 679,958

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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