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Major Customers and Concentration of Credit Risk (Tables)
 12 Months Ended
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
%