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Income Tax - Summary of Deferred Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | $ (519) | $ (200) | $ (6) | $ (132)
Deferred tax expenses / (benefits) | 730 | 374 | (55) |
Outside basis differences [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (4,099) | (3,829) |  |
Deferred tax expenses / (benefits) | 270 | 215 | 578 |
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 | (322) | (679) |  |
Accrued interest income [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets |  | (181) |  |
Deferred tax expenses / (benefits) | (172) | 13 | 12 |
Unutilized building allowance (net) [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | (12) | (36) |  |
Deferred tax expenses / (benefits) | (24) | (98) | (95) |
Unused tax losses [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 54 | 546 |  |
Deferred tax expenses / (benefits) | 481 | 119 | (459) |
Allowance for doubtful accounts [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 281 | 245 |  |
Deferred tax expenses / (benefits) | (21) | 47 | (97) |
Inventory impairment [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 412 | 554 |  |
Deferred tax expenses / (benefits) | 137 | 147 | (236) |
Rebates and other accrued liabilities [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 533 | 472 |  |
Deferred tax expenses / (benefits) | (18) | (46) | (38) |
Unpaid retirement benefits [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 1,504 | 1,553 |  |
Deferred tax expenses / (benefits) | 41 | (81) | (54) |
Deferred revenue and cost of sales [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 18 | 23 |  |
Deferred tax expenses / (benefits) | 5 | (6) | (14) |
Actuarial loss [Member |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 756 | 796 |  |
Unabsorbed depreciation [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
Net deferred tax assets | 680 | 637 |  |
Deferred tax expenses / (benefits) | 9 | 57 | (55) |
Mark-to-Market value of forward contract [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |  |
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 | (324) | (301) |  |
Deferred tax expenses / (benefits) | $ 22 | $ (21) | $ 431 |

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