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Trade Receivables, Net - Summary of Loss Allowance For Current Financial Assets At FVTOCI (Details) - Trade receivables [member]
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]      
Gross carrying amount $ 626,413 $ 22,308 $ 2,029,691
Loss allowance (Lifetime ECLs)     (1)
Net Amount $ 626,413 $ 22,308 $ 2,029,690
Not past due [member]      
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]      
Expected credit loss rate 0.00% 0.00% 0.00%
Gross carrying amount $ 613,968 $ 21,864 $ 2,029,324
Net Amount $ 613,968 $ 21,864 $ 2,029,324
Less than 1 month [member]      
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]      
Expected credit loss rate 0.00% 0.00%  
Gross carrying amount $ 9,874 $ 352  
Net Amount $ 9,874 $ 352  
1 to 3 months [member]      
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]      
Expected credit loss rate 0.00% 0.00% 0.00%
Gross carrying amount $ 2,571 $ 92 $ 207
Net Amount $ 2,571 $ 92 $ 207
More than 91 days [member]      
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]      
Expected credit loss rate     1.00%
Gross carrying amount     $ 160
Loss allowance (Lifetime ECLs)     (1)
Net Amount     $ 159