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Income Tax - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of income tax expense [Line Items] |  |  |
Statutory corporate income tax rate | 20.00% | 20.00% | 20.00%
Amount of uncertain tax position (excluding interest and penalties) included in the consolidated balance sheets | $ 674 | $ 706 | $ 828
Interest | 1,200 | 966 | 962
Unused tax losses [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Unused net operating losses for which no deferred tax assets have been recognized | 3,084 | 2,803 | 3,525
Tax losses unrecognized deferred tax assets (before tax effect) | 13,698 | 12,769 | 15,324
Deductible Temporary Differences [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Deductible temporary differences for which no deferred tax asset is recognized | 792 | 1,144 | 1,321
Deductible temporary differences (before tax effect) not recognized deferred tax assets. | 3,557 | 4,930 | 5,682
Uncertain tax position [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Interest | 108 | 114 | 135
Penalty | 0 | 0 | 0
Interest reversed | 0 | 276 | 1,453
Penalty reversed | 0 | 87 | 462
Exchange differences relating to interest | (41) | 65 | (140)
Exchange differences relating to penalty | $ (25) | $ 38 | $ (63)
Singapore (Country of domicile) [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Statutory corporate income tax rate | 17.00% | 17.00% | 17.00%
Withholding tax on dividends | 0.00% | 0.00% | 0.00%
Thailand (Country of domicile) [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Statutory corporate income tax rate | 20.00% | 20.00% | 20.00%
Withholding tax on dividends | 10.00% | 10.00% | 10.00%
Australia (Country of domicile) [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Statutory corporate income tax rate | 30.00% | 30.00% | 30.00%
The People's Republic of China (Country of domicile) [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Statutory corporate income tax rate | 25.00% | 25.00% | 25.00%
Withholding tax on dividends | 10.00% | 10.00% | 10.00%

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