Concentrations of Credit Risk and Major Customers

12 Months Ended

Dec. 31, 2014

Risks And Uncertainties [Abstract]

Concentrations of Credit Risk and Major Customers

20. Concentrations of Credit Risk and Major Customers

Financial instruments that potentially subject us to concentrations of credit risk consist of accounts receivable and unbilled receivables. Customers that comprised 10% or more of our revenue, accounts receivable and unbilled receivables are as follows:

Percentage of total revenue for the year ended December 31:

Customer	Segment	2014		2013		2012
U.S. Government agencies and departments	Government		22%		32%		44%
Verizon Wireless (various divisions, directly and through channel)	Commercial		16%		16%		13%

Percentage of receivables (billed and unbilled) as of December 31:

Customer	Segment	2014		2013
U.S. Government agencies and departments	Government		31%		10%
Verizon Wireless (various divisions, directly and through channel)	Commercial		15%		17%
AT&T (various divisions)	Commercial	<10%			13%

As of December 31, 2014, our total exposure to credit risk from the above customers was $22,908. As of December 31, 2013, our exposure to such risks was $26,643. We did not experience significant losses from amounts due to us by any customers for the year ended December 31, 2014 or 2013.