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Income Tax - Major Components of Income Tax Expenses (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current income tax: |  |  |
Current income tax charge | $ 4,068 | $ 4,785 | $ (681)
Previously unrecognized tax loss used to reduce current income tax | (128) | (1,066) | (21)
Adjustments for current income tax of prior years | 1 | 348 | 77
Total current income tax | 3,941 | 4,067 | (625)
Deferred tax expenses/(benefits): |  |  |
Relating to origination and reversal of temporary differences | 243 | 1,210 | 1,135
Income tax expense reported in the income statement | 3,886 | 5,140 | 510
Previously unrecognized tax loss used to reduce deferred tax expenses | (298) | (137) |
Total deferred tax expenses/(benefits) | (55) | 1,073 | 1,135
Deferred tax related to items recognized in other comprehensive income during the year: |  |  |
Change in fair value of equity instrument, Recognized during the year | (84) | (16) | (20)
Net loss on actuarial gains and losses, Recognized during the year | (82) | (154) |
Income tax benefits charged to other comprehensive (loss) income | $ (166) | $ (170) | $ (20)

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- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax expense arising from the write-down, or reversal of a previous write-down, of a deferred tax asset. [Refer: Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_g&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_h&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2018-01-01 -Paragraph 35 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2018-03-01&anchor=para_35_b_viii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 79 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_79&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_d&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_g&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_90&doctype=Standard -URIDate 2018-03-16 + Details
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