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Major Customers and Concentration of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2012
Risks and Uncertainties [Abstract] |
Schedule of major customers and concentration risks |
Customer | 2012 |  | % of Total Revenue |  | 2011 |  | % of Total Revenue |  | 2010 |  | % of Total Revenue
NIAID | $ | 2,831,115 |  |  | 69 | % |  | $ | 7,801,976 |  |  | 80 | % |  | $ | 4,064,319 |  |  | 66 | %
United States Government grant—Patient Protection and Affordable Care Act of 2010 (“PPACA”) | — |  |  | — |  |  | — |  |  | — |  |  | 733,438 |  |  | 12 |
VGX Int’l (affiliated entity) | 577,467 |  |  | 14 |  |  | 411,459 |  |  | 4 |  |  | 381,206 |  |  | 6 |
U.S. Army grant | — |  |  | — |  |  | — |  |  | — |  |  | 373,315 |  |  | 6 |
PATH/MVI | 84,714 |  |  | 2 |  |  | 740,266 |  |  | 8 |  |  | 303,417 |  |  | 5 |
Wyeth | — |  |  | — |  |  | — |  |  | — |  |  | 75,000 |  |  | 1 |
Drexel University | 96,812 |  |  | 2 |  |  | 491,056 |  |  | 5 |  |  | — |  |  | — |
University of Pennsylvania | 216,216 |  |  | 5 |  |  | 124,433 |  |  | 1 |  |  | — |  |  | — |
Small Business Innovation Research ("SBIR") grant | 205,167 |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | — |
All other | 107,161 |  |  | 3 |  |  | 226,067 |  |  | 2 |  |  | 214,010 |  |  | 4 |
Total Revenue | $ | 4,118,652 |  |  | 100 | % |  | $ | 9,795,257 |  |  | 100 | % |  | $ | 6,144,705 |  |  | 100 | %

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + 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 -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 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 6: 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 21, 22, 23, 24, 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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