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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 13, 2016
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Cash consideration       $ 943
Bargain purchase gain net of income taxes       3,542
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 enhanced our solutions for the cable MSO industry and provided cable operators with the scalable solutions, services and support they required 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     $ 1,800 $ 1,000