Segment Information - Revenue by Major Customer (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Nokia Siemens Networks [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	17.40%	25.40%
NEC [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	14.50%
Danaher [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage		14.10%