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Effects on Initial Application of IFRS 9 and Information for the Year Ended December 31,2017 in Conformity With IAS 39 - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Jan. 01, 2018 TWD ($)
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Contract assets |  | $ 377,869 |  | $ 299,835 | $ 254,997
Retained earnings |  | 4,651,215 | $ 155,507 | 3,602,663 |
Deferred tax assets | $ 212,372 | $ 194,552 | $ 6,505 | $ 226,716 |
VIGOUR TECHNOLOGY Corporation [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Impairment loss of investments | $ 41,336 |  |  |  |
Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Contract assets |  |  |  |  | (115)
Accounts receivable |  |  |  |  | (1,819)
Other receivables |  |  |  |  | (5)
Other receivables-related parties |  |  |  |  | (2)
Retained earnings |  |  |  |  | (1,940)
Deferred tax assets |  |  |  |  | $ 1

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