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Income Tax - Summary of Deferred Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018 | Dec. 31, 2014
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | $ (132) | $ 526 | $ 1,601 |  | $ 1,831
Deferred tax expenses / (benefits) | 1,073 | 1,135 | (135) |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets | 3,022 | 3,114 |  | $ 3,026 |
Deferred tax liabilities | (3,154) | (2,588) |  |  |
Deferred tax assets, net | (132) | 526 | 1,601 |  | $ 1,831
Outside basis differences [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | (3,036) | (2,434) |  |  |
Deferred tax expenses / (benefits) | 602 | (269) | (72) |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | (3,036) | (2,434) |  |  |
Revaluations of available-for-sale investment to fair value [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | (429) | (445) |  |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | (429) | (445) |  |  |
Accrued interest income [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | (141) | (118) |  |  |
Deferred tax expenses / (benefits) | 11 | 39 | 2 |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | (141) | (118) |  |  |
Unutilized building allowance (net) [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | (235) | (207) |  |  |
Deferred tax expenses / (benefits) | 11 | 119 | 151 |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | (235) | (207) |  |  |
Unused tax losses [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 197 | 619 |  |  |
Deferred tax expenses / (benefits) | 455 | 133 | (710) |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 197 | 619 |  |  |
Allowance for doubtful accounts [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 200 | 159 |  |  |
Deferred tax expenses / (benefits) | (25) | (36) | (29) |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 200 | 159 |  |  |
Inventory impairment [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 422 | 235 |  |  |
Deferred tax expenses / (benefits) | (161) | 714 | (249) |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 422 | 235 |  |  |
Allowance for impairment in investments [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Deferred tax expenses / (benefits) | 0 | 382 |  |  |
Rebates and other accrued liabilities [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 427 | 390 |  |  |
Deferred tax expenses / (benefits) | (6) | 171 | 60 |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 427 | 390 |  |  |
Unpaid retirement benefits [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 1,291 | 1,117 |  |  |
Deferred tax expenses / (benefits) | (62) | (47) | 485 |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 1,291 | 1,117 |  |  |
Deferred revenue and cost of sales [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 2 | 374 |  |  |
Deferred tax expenses / (benefits) | 393 | (62) | 70 |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 2 | 374 |  |  |
Actuarial loss [Member |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 368 | 213 |  |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 368 | 213 |  |  |
Unabsorbed depreciation [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 699 | 625 |  |  |
Deferred tax expenses / (benefits) | (45) | 34 | 140 |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | 699 | 625 |  |  |
Others [Member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |  |
Net deferred tax assets | 103 | (2) |  |  |
Deferred tax expenses / (benefits) | (100) | (43) | $ 17 |  |
Reflected in the balance sheet as follows: |  |  |  |  |
Deferred tax assets, net | $ 103 | $ (2) |  |  |

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