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Income Tax - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 706 | $ 828 | $ 1,856
Interest | 966 | 962 | 1,304
Unused tax losses [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Unused net operating losses for which no deferred tax assets have been recognized | 2,803 | 3,525 | 2,742
Tax losses unrecognized deferred tax assets (before tax effect) | 12,769 | 15,324 | 11,572
Deductible Temporary Differences [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Deductible temporary differences for which no deferred tax asset is recognized | 1,144 | 1,321 | 731
Deductible temporary differences (before tax effect) not recognized deferred tax assets. | 4,930 | 5,682 | 2,927
Uncertain tax position [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Interest | 114 | 135 | 321
Penalty | 0 | 0 | 0
Interest reversed | 276 | 1,453 | 276
Penalty reversed | 87 | 462 | 88
Exchange differences relating to interest | 65 | (140) | (132)
Exchange differences relating to penalty | $ 38 | $ (63) | $ (65)
Singapore (Country of domicile) [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Statutory corporate income tax rate | 17.00% | 17.00% | 17.00%
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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