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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)