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Income Tax - Summary of Unused Loss Carry-forward (Detail) - Dec. 31, 2019 - 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 | $ 1,509,564 | $ 50,471
2020 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 104,330 | 3,488
2021 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 78,009 | 2,608
2022 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 140,301 | 4,691
2023 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | 298,669 | 9,986
2024 and thereafter [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused loss carry-forward | $ 888,255 | $ 29,698

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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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 + Details
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