Financial Assets at Amortized Cost - Summary of Financial Assets at Amortized Cost (Detail) - TWD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Instruments At Amortised Cost Category[abstract]
Time deposits	$ 29,239	$ 206,482
Restricted bank deposits	37,539	48,319
Interest income	$ 1,187	$ 2,206	$ 4,467

The amount of revenue arising from interest for financial assets that are measured at amortised cost. [Refer: Interest income; Financial assets at amortised cost]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 20
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20_b&doctype=Standard
-URIDate 2021-03-24

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