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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)