Segment Information - Accounts Receivable (Details)	3 Months Ended
	Mar. 31, 2013 Nokia Siemens Networks [Member]	Mar. 31, 2012 Nokia Siemens Networks [Member]	Mar. 31, 2013 Nokia Siemens Networks [Member] Accounts Receivable [Member]	Dec. 31, 2012 Nokia Siemens Networks [Member] Accounts Receivable [Member]	Mar. 31, 2013 NEC [Member]	Mar. 31, 2013 NEC [Member] Accounts Receivable [Member]	Mar. 31, 2013 Philips Healthcare [Member] Accounts Receivable [Member]
Concentration Risk [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	17.40%	25.40%			14.50%
Concentration Risk, Percentage			16.20%	24.70%		16.50%	10.60%