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Inventories - Cost of Inventories Recognized as an Expense (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Analysis of income and expense [abstract]
Cost of revenue	$ 20,103,735		$ 17,957,568	$ 16,372,032
Loss on abandonment	552		5,323	12,369
Allowance for inventory valuation and obsolescence loss	41,770		16,317	27,341
Cost of revenue	$ 20,146,057	$ 726,246	$ 17,979,208	$ 16,411,742

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The amount of inventories recognised as an expense during the period. [Refer: Inventories]

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The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories.

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The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories]

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Loss on abandonment, inventory.

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