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Income tax expense - Summary of Deductible Temporary Differences for which No Deferred Tax Asset Is Recognized (Detail) - TWD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of Detailed Information about Deductible Temporary Difference that are Not Recognized as Deferred Tax Assets Explanatory [Abstract] |  |
Deductible temporary differences | $ 371,133 | $ 946,236

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Disclosure of detailed information about deductible temporary difference that are not recognized as deferred tax assets explanatory. + References No definition available. + Details
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