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Related Party Transactions - Summary of Disposal of Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment]

+ References

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- Definition

The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

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