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ACQUISITION - Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 20,125 $ 21,527 $ 21,887
CUI-Canada, Inc [Member]      
Business Acquisition [Line Items]      
Purchase price 4,501    
Inventory 2,302    
Property and equipment 831    
Software 73    
Intangible, customer lists 270    
Intangible, trade mark and trade name 130    
Intangible, technology-based asset 1,000    
Goodwill 64    
Liabilities assumed (169)    
Business Acquisition Purchase Price Allocation total $ 4,501