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Income Tax - Summary of Unrecognized Deferred Tax Assets Related to Loss Carry-forward, Investment Credits and Deductible Temporary Differences (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]
Loss carry-forward	$ 1,340,849	$ 48,336	$ 1,497,056
Investment credits	44,244	1,595	49,611
Deductible temporary differences	241,249	8,697	377,242
Unrecognized deferred tax assets	$ 1,626,342	$ 58,628	$ 1,923,909

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- Definition

Unrecognized deferred tax assets.

+ References

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- Definition

The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]]

+ References

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-IssueDate 2021-01-01
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-Subparagraph e
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- Definition

The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]]

+ References

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-Paragraph 81
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- Definition

The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

+ References

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