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Fair value measurement - Quantitative information about the significant unobservable inputs used in level 3 fair value measurements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items] |  |  |  |
Contingent consideration liability at fair value | $ 22,100 | $ 16,410 | $ 15,755 | $ 17,570
Expected revenues annual average [member] |  |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items] |  |  |  |
Contingent consideration liability at fair value | $ 222,238 |  |  |
Possible increase in unobservable input, liabilities | 10.00% |  |  |
Possible decrease in unobservable input, liabilities | 10.00% |  |  |
Amount of increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities | $ 2,200 |  |  |
Amount of increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities | 2,200 |  |  |
Contingent consideration [member] | At fair value [member] | Rate before tax [member] |  |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items] |  |  |  |
Contingent consideration liability at fair value | $ 22,100 |  |  |
Range of inputs | 9.30 |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 10.00% |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | 0.93% |  |  |
Amount of increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities | $ 1,500 |  |  |
Amount of increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities | $ 1,500 |  |  |

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- Definition The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The amount of increase (decrease) in the fair value measurement of liabilities due to a reasonably possible decrease in an unobservable input. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of increase (decrease) in the fair value measurement of liabilities due to a reasonably possible increase in an unobservable input. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of liabilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2020-01-01 + Details
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