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Major Customers and Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2013
Risks and Uncertainties [Abstract]  
Schedule of major customers and concentration risks
Customer
2013
 
% of Total
Revenue
 
2012
 
% of Total
Revenue
 
2011
 
% of Total
Revenue
Roche
$
9,181,759

 
68
%
 
$
—

 
—
%
 
$
—

 
—
%
NIAID
2,090,939

 
16

 
2,831,115

 
69
%
 
7,801,976

 
80
%
VGX Int'l (affiliated entity)
425,000

 
3

 
577,467

 
14

 
411,459

 
4

All other
1,769,648

 
13

 
710,070

 
17

 
1,581,822

 
16

Total Revenue
$
13,467,346

 
100
%
 
$
4,118,652

 
100
%
 
$
9,795,257

 
100
%