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Related Party Transactions - Summary of Disposal of Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of transactions between related parties [Line Items] |  |  |  |
Selling price | $ 21,434 | $ 717 | $ 18,160 | $ 306,634
Gain on disposal | $ 20,271 |  | $ 14,274 | 132,777
Unimos Shanghai [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Selling price |  |  |  | 21,982
Gain on disposal |  |  |  | $ 20,240

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- Definition The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_16_b&doctype=Standard -URIDate 2019-03-27 + Details
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