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New Standards And Interpretations - Schedule of Significant Effects of Adopting New Standards (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Contract assets | $ 4,686 | $ 1,460 | $ 162 |
Available-for-sale financial assets expected to reclassify |  |  | 2,747 |
Fair value gains on financial assets reclassified from available-for-sale financial assets reserve to fair value other comprehensive income reserve |  |  | 1,717 |
Trade receivables | 74,077 | 79,617 | 112,419 | $ 112,403
Retained earnings | 53,384 | 55,016 | 53,257 | 53,350
Deferred tax assets | 3,939 | 3,919 | 3,026 | $ 3,022
Contract liabilities - current | $ 216 | $ 756 | 113 |
IFRS 9 [Member] |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Trade Receivables Impairment |  |  | 16 |
Trade receivables |  |  | 16 |
Retained earnings |  |  | 16 |
Effect of IFRS 9 And IFRS 15 [Member] |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Retained earnings |  |  | 4 |
Deferred tax assets |  |  | 4 |
Non-controlling interests [Member] |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Fair value gains on financial assets reclassified from available-for-sale financial assets reserve to fair value other comprehensive income reserve |  |  | 843 |
Increase (decrease) due to application of IFRS 15 [member] |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Contract assets |  |  | 162 |
Gross amounts due from customers for contract work-in-progress |  |  | (162) |
Retained earnings |  |  | (113) |
Contract liabilities - current |  |  | $ 113 |

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