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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 13, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]          
Cash consideration         $ 943
Bargain purchase gain net of income taxes     $ 3,550   $ 3,550
CommScope, Inc. Subsidiaries Fiber Access Products, Technologies and Service Relationships [Member]          
Business Acquisition [Line Items]          
Date of acquisition       Sep. 13, 2016  
Business acquisition, description       On September 13, 2016, we acquired key fiber access products, technologies and service relationships from subsidiaries of CommScope, Inc. for $0.9 million in cash. This acquisition will enhance our solutions for the cable MSO industry and will provide cable operators with the scalable solutions, services and support they require to compete in the multi-gigabit service delivery market.  
Cash consideration $ 943        
Bargain purchase gain net of income taxes $ 3,542   3,500    
Business acquisition estimated reduce in bargain purchase gain recognized amount     $ 8    
Acquisition and integration related expenses and amortization of acquired intangibles   $ 200   $ 1,600