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Major Customers and Concentration of Credit Risk (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Concentration Risk [Line Items] |  |  |
Revenue | $ 4,118,652 | $ 9,795,257 | $ 6,144,705
Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00%
NIAID [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 2,831,115 | 7,801,976 | 4,064,319
Accounts receivable | 612,000 |  |
NIAID [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 69.00% | 80.00% | 66.00%
NIAID [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 71.00% |  |
United States Government grant—Patient Protection and Affordable Care Act of 2010 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 0 | 0 | 733,438
United States Government grant—Patient Protection and Affordable Care Act of 2010 [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 0.00% | 0.00% | 12.00%
VGX Int'l [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 577,467 | 411,459 | 381,206
VGX Int'l [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 14.00% | 4.00% | 6.00%
U.S. Army grant [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 0 | 0 | 373,315
U.S. Army grant [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 0.00% | 0.00% | 6.00%
PATH/MVI [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 84,714 | 740,266 | 303,417
Accounts receivable |  | 121,000 |
PATH/MVI [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 2.00% | 8.00% | 5.00%
PATH/MVI [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage |  | 26.00% |
Wyeth [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 0 | 0 | 75,000
Wyeth [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 0.00% | 0.00% | 1.00%
Drexel University [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 96,812 | 491,056 | 0
Accounts receivable |  | 294,000 |
Drexel University [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 2.00% | 5.00% | 0.00%
Drexel University [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage |  | 64.00% |
University of Pennsylvania [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 216,216 | 124,433 | 0
Accounts receivable | 95,000 |  |
University of Pennsylvania [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 5.00% | 1.00% | 0.00%
University of Pennsylvania [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 11.00% |  |
Small Business Innovation Research Grant [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | 205,167 | 0 | 0
Small Business Innovation Research Grant [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 5.00% | 0.00% | 0.00%
All Other Customers [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue | $ 107,161 | $ 226,067 | $ 214,010
All Other Customers [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 3.00% | 2.00% | 4.00%

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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