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Income Tax - Summary of Unused Loss Carry-forward (Detail) - Dec. 31, 2017 - Unused tax losses [member] $ in Thousands, $ in Thousands | TWD ($) | USD ($)
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | $ 1,223,495 | $ 41,279
2018 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 230,656 | 7,782
2019 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 34,981 | 1,180
2020 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 615,327 | 20,760
2021 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 164,377 | 5,546
2022 and thereafter [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | $ 178,154 | $ 6,011

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- Definition The amount of deferred tax liabilities net of deferred tax assets, when the absolute amount of deferred tax liabilities is greater than the absolute amount of deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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