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Income Tax - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 | $ 339 | $ 451 | $ 674
Interest | 615 | 845 | 1,200
Unused tax losses [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Unused net operating losses for which no deferred tax assets have been recognized | 3,751 | 4,038 | 3,084
Tax losses unrecognized deferred tax assets (before tax effect) | 17,028 | 18,422 | 13,698
Deductible Temporary Differences [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Deductible temporary differences for which no deferred tax asset is recognized | 1,866 | 1,030 | 792
Deductible temporary differences (before tax effect) not recognized deferred tax assets. | 9,683 | 4,695 | 3,557
Uncertain tax position [Member] |  |  |
Disclosure of income tax expense [Line Items] |  |  |
Interest | 61 | 81 | 108
Penalty | 0 | 0 | 0
Interest reversed | 227 | 223 | 0
Penalty reversed | 72 | 71 | 0
Exchange differences relating to interest | 50 | (12) | (41)
Exchange differences relating to penalty | $ (27) | $ (6) | $ (25)
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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