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Income and Expenses Items - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Other Operating Income and Expense [Line Items] |  |  |
Government grant received | $ 973 | $ 425 | $ 106
COVID-19 Epidemic [Member] |  |  |
Disclosure of Other Operating Income and Expense [Line Items] |  |  |
Government grant received | $ 882 |  |
Immediate Holding Company [Member] |  |  |
Disclosure of Other Operating Income and Expense [Line Items] |  |  |
Income from discharge of liability |  |  | 1,537
Reduction of Other Current Assets [Member] |  |  |
Disclosure of Other Operating Income and Expense [Line Items] |  |  |
Recognized other expenses - others |  |  | $ 749

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- Definition The amount of income recognised in relation to government grants. [Refer: Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 20 -IssueDate 2020-01-01 -Paragraph 39 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2020-en-r&anchor=para_39_b&doctype=Standard -URIDate 2020-01-01 + Details
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