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Income Tax - Summary of Deferred Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | $ (6) | $ (132) | $ 526 | $ 1,601
Deferred tax expenses / (benefits) | (55) | 1,073 | 1,135 |
Outside basis differences [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (3,614) | (3,036) |  |
Deferred tax expenses / (benefits) | 578 | 602 | (269) |
Revaluations of financial assets at fair value through other comprehensive income [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (345) | (429) |  |
Accrued interest income [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (154) | (141) |  |
Deferred tax expenses / (benefits) | 12 | 11 | 39 |
Unutilized building allowance (net) [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (133) | (235) |  |
Deferred tax expenses / (benefits) | (95) | 11 | 119 |
Unused tax losses [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 644 | 197 |  |
Deferred tax expenses / (benefits) | (459) | 455 | 133 |
Allowance for doubtful accounts [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 290 | 200 |  |
Deferred tax expenses / (benefits) | (97) | (25) | (36) |
Inventory impairment [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 657 | 422 |  |
Deferred tax expenses / (benefits) | (236) | (161) | 714 |
Allowance for impairment in investments [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Deferred tax expenses / (benefits) | 0 | 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 | 426 | 427 |  |
Deferred tax expenses / (benefits) | (38) | (6) | 171 |
Unpaid retirement benefits [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 1,353 | 1,291 |  |
Deferred tax expenses / (benefits) | (54) | (62) | (47) |
Deferred revenue and cost of sales [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 16 | 2 |  |
Deferred tax expenses / (benefits) | (14) | 393 | (62) |
Actuarial loss [Member |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 450 | 368 |  |
Unabsorbed depreciation [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 701 | 699 |  |
Deferred tax expenses / (benefits) | (55) | (45) | 34 |
Mark-to-Market value of forward contract [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 28 |  |  |
Deferred tax expenses / (benefits) | (28) |  |  |
Others [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (325) | 103 |  |
Deferred tax expenses / (benefits) | $ 431 | $ (100) | $ (43) |

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