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Segment Information - Summary of Revenue, Property and Equipment, Net by Geographic Region (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
 [2]
Jul. 01, 2016
 [2]
Apr. 01, 2016
 [2],[3]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net revenues:                      
Revenue $ 100,974 $ 92,014 $ 82,315 $ 82,943 $ 113,102 [1],[2] $ 101,406 $ 109,571 $ 81,832 $ 358,246 [4],[5] $ 405,911 [4] $ 377,027 [4]
Property and equipment, net:                      
Property and equipment, net 29,265       32,164       29,265 32,164  
UNITED STATES                      
Net revenues:                      
Revenue [4]                 131,773 171,016 175,466
Property and equipment, net:                      
Property and equipment, net 13,786       15,197       13,786 15,197  
International [Member]                      
Net revenues:                      
Revenue [4]                 226,473 234,895 $ 201,561
ISRAEL                      
Property and equipment, net:                      
Property and equipment, net 8,904       9,966       8,904 9,966  
FRANCE                      
Property and equipment, net:                      
Property and equipment, net 4,573       4,872       4,573 4,872  
All countries except United States, Israel and France [Member] [Member]                      
Property and equipment, net:                      
Property and equipment, net $ 2,002       $ 2,129       $ 2,002 $ 2,129  
[1] In 2016, as part of the TVN integration plan, the Company established the TVN VDP to enable the French employees of TVN to voluntarily terminate with certain benefits. The Company recorded a charge of $13.1 million for TVN VDP in the fourth quarter of 2016.
[2] On February 29, 2016, the Company completed the acquisition of TVN and applied the acquisition method of accounting for the business combination. The selected quarterly financial data for the year ended December 31, 2016 of the combined entity includes 10 months of operating results of TVN beginning March 1, 2016.
[3] In the first and third quarter of 2016 and the fourth quarter of 2017, the Company recorded impairment charges of $1.5 million, $1.2 million, and $0.5 million, respectively, for its investment in Vislink. (See Note 3, “Investments in Other Equity Securities,” of the notes to the Consolidated Financial Statements for additional information).
[4] Revenue is attributed to countries based on the location of the customer.
[5] The Company has historically employed an aggregate allocation methodology based on total revenues to attribute professional services revenue and sales expenses between its Video and Cable Edge segments. Beginning in the fourth quarter of 2017, the Company has prospectively changed to a more precise attribution methodology as the activities of selling and supporting the CableOS solution have become increasingly distinct from those of Video solutions. The impact of making this change in the fourth quarter of 2017 compared to the Company’s historical approach was a reduction in operating income of $2.4 million from the Video segment and a corresponding increase to the operating income of the Cable Edge segment. The Company believes that the updated allocation methodology will provide greater clarity regarding the operating metrics of the Video and Cable Edge business segments.