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Basic and diluted earnings per share (Details) - shares	12 Months Ended
	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

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- Definition

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+ References

No definition available.

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