XML 70 R45.htm IDEA: XBRL DOCUMENT v3.19.3
Business Combinations - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2018
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]                
Gain on contingency           $ 1,230,000    
Goodwill           $ 7,000,000.0   $ 7,100,000
Bargain purchase gain net of income taxes             $ 11,322,000  
SmartRG Inc [Member]                
Business Acquisition [Line Items]                
Date of acquisition           Nov. 30, 2018    
Business acquisition, description           On November 30, 2018, we acquired SmartRG, Inc. (“SmartRG”), a provider of carrier-class, open connected home platforms and cloud services for broadband service providers in exchange for cash consideration. This transaction was accounted for as a business combination. We have included the financial results of this acquisition in our consolidated financial statements since the date of acquisition. The revenue from the SmartRG portfolio is included in the Subscriber Solutions & Experience category within the Network Solutions and Services & Support reportable segments.    
Business combination, contingent consideration, liability $ 1,200,000              
Gain on contingency     $ 1,200,000          
Business combination escrow amount 2,800,000              
Goodwill           $ 3,500,000    
Acquisition and integration related expenses and amortization of acquired intangibles   $ 500,000   $ 0   $ 1,700,000 $ 0  
SmartRG Inc [Member] | Minimum [Member]                
Business Acquisition [Line Items]                
Business combination potential release of funds 0              
SmartRG Inc [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Business combination potential release of funds $ 2,800,000              
Sumitomo [Member]                
Business Acquisition [Line Items]                
Date of acquisition           Mar. 19, 2018    
Business acquisition, description           On March 19, 2018, we acquired Sumitomo Electric Lightwave Corp.’s North American EPON business and entered into a technology license and OEM supply agreement with Sumitomo Electric Industries, Ltd.    
Bargain purchase gain net of income taxes         $ 11,300,000