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Standards Issued but Not Yet Effective - Schedule of Significant Effects of Adopting New Standards (Parenthetical) (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
Available-for-sale financial assets expected to reclassify 2,747    
Trade receivables 112,419 112,403 79,472
Retained earnings 53,257 53,350 46,012
Deferred tax assets 3,026 $ 3,022 $ 3,114
Contract liabilities - current 113    
IFRS 9 [Member]      
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]      
Trade receivables 16    
Retained earnings 16    
Effect of IFRS 9 And IFRS 15 [Member]      
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]      
Retained earnings 4    
Deferred tax assets 4    
Increase (decrease) due to application of IFRS 15 [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)    
Retained earnings (113)    
Contract liabilities - current $ 113