Accounts Receivable and Unbilled Accounts Receivables (Details 3)	Sep. 30, 2012	Dec. 31, 2011
Transportation Security Administration [Member]
As a % of Receivables	11.00%	9.00%
Department Of Homeland Security [Member]
As a % of Receivables	0.00%	34.00%
Lockheed Martin Corporation [Member]
As a % of Receivables	10.00%	0.00%