Segment Information - Revenue by Major Customer (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Nokia Siemens Networks [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	17.70%		18.60%	22.10%	18.30%
NEC [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage					10.60%
Philips Healthcare [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage			16.00%	10.00%	15.10%
An Asian Carrier [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	10.50%
Mavenir Systems [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	10.50%
Accounts Receivable [Member] | Nokia Siemens Networks [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage		18.50%		10.10%
Accounts Receivable [Member] | Philips Healthcare [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage		13.90%
Accounts Receivable [Member] | An Asian Carrier [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage				15.00%
Accounts Receivable [Member] | Mavenir Systems [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage				11.20%