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Other Financial Assets and Financial Liabilities - Reconciliation of the Beginning and Closing Balances of Available-for-sale Financial Instruments Classified as Level 3 Within the Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Beginning balance | $ 2,765 |
Ending balance | 2,747 | $ 2,765
Available-for-sale financial assets [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Beginning balance | 2,765 | 2,862
Re-measurement recognized in other comprehensive income (loss) | (80) | (102)
Exchange difference | 62 | 5
Ending balance | $ 2,747 | $ 2,765

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