Segment Information Segment Income or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 29, 2018		Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 642		$ (27,422)	$ (8,685)	$ (48,580)
Amortization of warrants	(284)			(395)
Unallocated Corporate Expenses	(50,961)		(61,237)	(107,471)	(122,803)
Stock-based compensation	(3,012)		(4,136)	(8,769)	(7,387)
Amortization of intangibles	(2,095)		(2,075)	(4,194)	(4,144)
Nonoperating Income (Expense)	(2,664)		(3,499)	(5,953)	(6,600)
Loss before income taxes	(2,022)		(30,921)	(14,638)	(55,180)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	6,779	[1]	(16,358)	7,261	(28,274)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated Corporate Expenses	$ (746)		$ (4,853)	$ (2,588)	$ (8,775)

[1] 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 Access 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 three and six months ended June 30, 2017 compared to the Company’s historical approach was an increase in operating loss of $2.1 million and $3.2 million, respectively, from the Video segment and a corresponding decrease in operating loss of the Cable Access segment. The Company believes that the updated allocation methodology will provide greater clarity regarding the operating metrics of the Video and Cable Access business segments.