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Major Customers and Concentration of Credit Risk
 12 Months Ended
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.