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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, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
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Disclosure of temporary difference, unused tax losses and unused tax credits [abstract] |  |  |
Loss carry-forward | $ 21,759 | $ 666,043 | $ 542,054
Deductible temporary differences | 10,854 | 332,255 | 712,141
Unrecognized deferred tax assets | $ 32,613 | $ 998,298 | $ 1,254,195

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