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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, 2019 TWD ($)	Dec. 31, 2019 USD ($)
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]
Gross carrying amount	$ 2,029,691	$ 67,860
Loss allowance (Lifetime ECLs)	(1)
Net Amount	$ 2,029,690	$ 67,860
Not past due [member]
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]
Expected credit loss rate	0.00%	0.00%
Gross carrying amount	$ 2,029,324	$ 67,848
Net Amount	$ 2,029,324	$ 67,848
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%
Gross carrying amount	$ 207	$ 7
Net Amount	$ 207	$ 7
1 to 3 months [member] | Bottom of range [member]
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]
Expected credit loss rate	0.00%	0.00%
More than 91 days [member]
Disclosure For Loss Allowance For Current Financial Assets At FVTOCI [Line Items]
Expected credit loss rate	1.00%	1.00%
Gross carrying amount	$ 160	$ 5
Loss allowance (Lifetime ECLs)	(1)
Net Amount	$ 159	$ 5

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The amount of current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 8
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard
-URIDate 2019-03-27

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