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Major Customers and Concentration of Credit Risk | 12 Months Ended
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Dec. 31, 2012
Risks and Uncertainties [Abstract] |
Major Customers and Concentration of Credit Risk | Major Customers and Concentration of Credit Risk
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 | %
During the years ended December 31, 2012, 2011 and 2010, the Company recognized revenue from various license fees and milestone payments, collaborative research and development agreements, grants and government contracts. As of December 31, 2012, $612,000 or 71% and $95,000 or 11% of accounts receivable was attributed to the NIAID and the University of Pennsylvania, respectively. As of December 31, 2011, $294,000 or 64% and $121,000 or 26% of accounts receivable was attributed to Drexel University and PATH MVI, respectively. There is minimal credit risk with these customers based upon collection history, their size and financial condition. Accordingly, the Company does not consider it necessary to record a reserve for uncollectible accounts receivable.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: 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 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -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. Reference 5: 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 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, 24 -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. Reference 8: 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 + Details
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