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Non-current Financial Assets at Fair Value Through Profit or Loss - Non-current - Summary of Amounts recognized in Profit or Loss in Relation to Financial Assets at Fair Value Through Profit or Loss (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial Assets At Fair Value Through Profit Or Loss [line items]    
Financial assets mandatorily measured at fair value through profit or loss $ 1,317 $ 1,485
Foreign partnership interest [member]    
Financial Assets At Fair Value Through Profit Or Loss [line items]    
Financial assets mandatorily measured at fair value through profit or loss (433) 38
Beneficiary certificates [member]    
Financial Assets At Fair Value Through Profit Or Loss [line items]    
Financial assets mandatorily measured at fair value through profit or loss $ 1,750 1,396
Derivative instrument [member]    
Financial Assets At Fair Value Through Profit Or Loss [line items]    
Financial assets mandatorily measured at fair value through profit or loss   $ 51