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Segment Information - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 TWD ($)
Disclosure of major customers [abstract]
Revenue recognized in current reporting period related to carried-forward contract liabilities for performance obligation not satisfied in prior year	$ 766

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- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfMajorCustomersAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 116
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_116_b&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_RevenueThatWasIncludedInContractLiabilityBalanceAtBeginningOfPeriod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration