Segment Information Revenue by Major Customer (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales Revenue, Net | Verizon Wireless
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	20.80%	35.90%
Sales Revenue, Net | Philips Healthcare
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	23.20%	15.70%	10.00%
Sales Revenue, Net | Nokia Solutions and Networks
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	12.50%		16.00%
Accounts Receivable | Verizon Wireless
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		10.40%
Accounts Receivable | Philips Healthcare
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	19.10%	15.40%
Accounts Receivable | Nokia Solutions and Networks
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	14.50%
Accounts Receivable | Reliance Jio Infocomm
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	18.70%	32.60%