Concentrations (Details)	6 Months Ended	3 Months Ended
	Jun. 30, 2013 item	Jun. 30, 2013 Three government customers item	Jun. 30, 2012 Two government customers item	Jun. 30, 2013 Two commercial customers item	Jun. 30, 2012 One individual commercial customer item	Jun. 30, 2013 Total revenues Customer	Jun. 30, 2012 Total revenues Customer	Jun. 30, 2013 Total revenues Customer U.S. Government	Jun. 30, 2012 Total revenues Customer U.S. Government	Jun. 30, 2013 Total revenues Customer Three government customers	Jun. 30, 2012 Total revenues Customer Two government customers	Jun. 30, 2013 Total revenues Customer Two commercial customers	Jun. 30, 2012 Total revenues Customer One individual commercial customer
Concentrations
Number of areas in which operations are concentrated	1
Percentage of revenue						55.90%	69.30%	44.10%	30.60%	40.40%	27.90%	54.80%	67.70%
Number of customers		3	2	2	1