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Share-based payment arrangements - Summary of Share-based Payments Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from share-based payment transactions with employees | $ 10,396 | $ 6,989
Share options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from share-based payment transactions with employees | 3,128 | 3,392
Restricted share units with no performance criteria |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from share-based payment transactions with employees | 1,600 | 1,425
Restricted share units with performance criteria |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from share-based payment transactions with employees | 1,195 | 175
Deferred units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from share-based payment transactions with employees | 2,209 | (277)
Performance share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from share-based payment transactions with employees | $ 2,264 | $ 2,274

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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