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Income Tax - Summary of Deferred Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | $ (200) | $ (6) | $ (132) | $ 526
Deferred tax expenses / (benefits) | 374 | (55) | 1,073 |
Outside basis differences [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (3,829) | (3,614) |  |
Deferred tax expenses / (benefits) | 215 | 578 | 602 |
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 | (679) | (345) |  |
Accrued interest income [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (181) | (154) |  |
Deferred tax expenses / (benefits) | 13 | 12 | 11 |
Unutilized building allowance (net) [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (36) | (133) |  |
Deferred tax expenses / (benefits) | (98) | (95) | 11 |
Unused tax losses [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 546 | 644 |  |
Deferred tax expenses / (benefits) | 119 | (459) | 455 |
Allowance for doubtful accounts [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 245 | 290 |  |
Deferred tax expenses / (benefits) | 47 | (97) | (25) |
Inventory impairment [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 554 | 657 |  |
Deferred tax expenses / (benefits) | 147 | (236) | (161) |
Rebates and other accrued liabilities [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 472 | 426 |  |
Deferred tax expenses / (benefits) | (46) | (38) | (6) |
Unpaid retirement benefits [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 1,553 | 1,353 |  |
Deferred tax expenses / (benefits) | (81) | (54) | (62) |
Deferred revenue and cost of sales [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 23 | 16 |  |
Deferred tax expenses / (benefits) | (6) | (14) | 393 |
Actuarial loss [Member |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 796 | 450 |  |
Unabsorbed depreciation [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 637 | 701 |  |
Deferred tax expenses / (benefits) | 57 | (55) | (45) |
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 | (28) |  |
Others [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (301) | (325) |  |
Deferred tax expenses / (benefits) | $ (21) | $ 431 | $ (100) |

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