Restructuring and Excess Facilities - Restructuring and Asset Impairment Charges COS vs OPEX (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	[1]	Dec. 31, 2015	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Product cost of revenue	$ 3,400		$ 113	$ 315
Operating expenses - Restructuring and related Charges	14,602		1,372	2,761
Restructuring and Related Cost	$ 18,002		$ 1,485	$ 3,076

[1] The restructuring and related charges for the year ended December 31, 2016 is net of $0.6 million and $1.4 million, in product cost of revenue and operating expenses-restructuring and related charges, respectively, of gain from TVN pension curtailment. See Note 13, “Employee Benefit Plans and Stock-based Compensation-TVN Retirement Benefit Plan,” for additional information on gain from TVN pension curtailment.