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Trade Receivables, Net - Summary of Trade Receivables, Net (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets [Line Items] |  |  |
Trade receivables | $ 2,596,581 | $ 79,481,359 | $ 55,200,706
Cost [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Trade receivables | 2,601,658 | 79,636,748 | 55,265,607
Allowance for doubtful debts [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Trade receivables | $ 5,077 | $ 155,389 | $ 64,901

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