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Concentrations (Details) | 12 Months Ended
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Dec. 31, 2012 item | Dec. 31, 2011 item
Concentrations |  |
Number of areas in which operations are concentrated | 1 |
U.S. Government |  |
Concentrations |  |
Number of customers | 4 |
One individual commercial customer |  |
Concentrations |  |
Number of customers | 1 | 1
Three government customers |  |
Concentrations |  |
Number of customers |  | 3
Total revenues | Customer | U.S. Government |  |
Concentrations |  |
Percentage of revenue | 40.50% | 38.40%
Total revenues | Customer | One individual commercial customer |  |
Concentrations |  |
Percentage of revenue | 57.00% | 58.00%
Total revenues | Customer | Three government customers |  |
Concentrations |  |
Percentage of revenue |  | 34.20%
Total revenues | Customer | Four government customers |  |
Concentrations |  |
Percentage of revenue | 38.20% |

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- Definition Represents the number of areas in which operations of the entity are concentrated. + References No definition available. + Details
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- Definition Represents the number of major customers of the entity. + References No definition available. + Details
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- Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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