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Accounts payable - Summary of Accounts Payable (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement [LineItems]    
Trade and other payables $ 966,821 $ 819,548
Account payable [Member]    
Statement [LineItems]    
Trade and other payables 766,805 419,520
Estimated account payable [Member]    
Statement [LineItems]    
Trade and other payables $ 200,016 $ 400,028