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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Depreciation charges $ 840 $ 880
Cost of Sales    
Property Plant And Equipment [Line Items]    
Depreciation charges 710 740
Selling, General and Administrative Expenses    
Property Plant And Equipment [Line Items]    
Depreciation charges $ 130 $ 100