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3. Summary of Significant Accounting Policies - Concentration of Revenue (Details)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
|
Sep. 30, 2012
|
Sep. 30, 2011
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|
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Top Five Customers
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| Concentration of revenue | 76.00% | 58.00% | 54.00% | 29.00% |
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Federal Agencies
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| Concentration of revenue | 38.00% | 29.00% | 46.00% | 15.00% |