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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 ($) | Dec. 31, 2019 USD ($)
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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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- Definition 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 + Details
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