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Segment Information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (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
 [1],[2]
Sep. 30, 2016
 [2]
Jul. 01, 2016
 [2]
Apr. 01, 2016
 [2],[3]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenue $ 100,974 $ 92,014 $ 82,315 $ 82,943 $ 113,102 $ 101,406 $ 109,571 $ 81,832 $ 358,246 [4],[5] $ 405,911 [4] $ 377,027 [4]
Unallocated corporate expenses                 (240,697) (267,786) (215,660)
Stock-based compensation expense                 (16,610) [6] (13,060) (15,582)
Amortization of Intangible Assets                 (8,322) [6] (14,836) (6,502)
Operating Income (Loss)                 (70,877) [6] (67,036) (12,948)
Non-operating expense, net                 (13,830) [6] (13,394) (3,120)
Loss before income taxes                 (84,707) [6] (80,430) (16,068)
Video [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenue                 319,473 [5] 351,489 291,779
Cable Edge [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenue                 38,773 [5] 54,422 85,248
Operating Segments [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss)                 (25,178) [5],[6] (168) 11,930
Operating Segments [Member] | Video [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss)                 (2,024) [5] 11,963 13,529
Operating Segments [Member] | Cable Edge [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss)                 (23,154) [5] (12,131) (1,599)
Corporate, Non-Segment [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Unallocated corporate expenses [6]                 $ (20,767) $ (38,972) $ (2,794)
[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.
[6] For the years ended December 31, 2017 and 2016, the unallocated corporate expenses included TVN acquisition- and integration-related costs, TVN VDP costs (see Note 10, “Restructuring and Related charges-TVN VDP,” for more information on TVN VDP ) and Cable Edge product line inventory obsolescence costs, totaling $7.9 million and $32.2 million, respectively. In addition, in fiscal year 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 19, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.