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Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Discount rates | 13.80% |  |
Increase in discount rate | 15.20% |  |
Intangible assets | $ 95,568 | $ 108,116 | $ 101,168
Percentage of rise in increase in discount rate | 1.40% |  |
Goodwill [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated recoverable amount | $ 2,500,000 | $ 4,300,000 |
Percentage of growth rate | 4.50% | 3.00% |
Discount rates | 13.80% | 13.50% |
Intangible assets | $ 20,380 | $ 20,380 | $ 20,380
Capitalised development expenditure [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets | 10,800 | $ 23,600 |
Amortization expense | 2,500 |  |
Capitalised development expenditure [member] | Covid 19 [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment loss | $ 1,000 |  |

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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2020-01-01 + Details
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