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Standards Issued but Not Yet Effective - Schedule of Significant Effects of Adopting New Standards (Detail) - USD ($)
$ in Thousands
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]      
Contract assets - current $ 162    
Gross amounts due from customers for contract work-in-progress   $ 162 $ 2,045
Trade receivables 112,419 112,403 79,472
Other non-current financial assets – available for sale   2,747 2,765
Financial assets at fair value through other comprehensive income 2,747    
Deferred income tax assets 3,026 3,022 3,114
Total affected assets 118,354 118,334  
Contract liabilities - current 113    
Total affected liabilities 113    
Retained earnings 53,257 53,350 $ 46,012
Total affected equity 53,257 53,350  
Total affected liabilities and equity 53,370 $ 53,350  
Effect Of Adoption Of New Standards [Member]      
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]      
Contract assets - current 162    
Gross amounts due from customers for contract work-in-progress (162)    
Trade receivables 16    
Other non-current financial assets – available for sale (2,747)    
Financial assets at fair value through other comprehensive income 2,747    
Deferred income tax assets 4    
Total affected assets 20    
Contract liabilities - current 113    
Total affected liabilities 113    
Retained earnings (93)    
Total affected equity (93)    
Total affected liabilities and equity $ 20