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Major Customers and Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2017
Risks and Uncertainties [Abstract]  
Schedule of major customers and concentration risks
Customer
2017 Revenue
 
% of Total
Revenue
 
2016 Revenue
 
% of Total
Revenue
 
2015 Revenue
 
% of Total
Revenue
MedImmune
$
22,269,773

 
53
%
 
$
1,518,639

 
4
%
 
$
16,037,731

 
40
%
DARPA
9,983,927

 
24

 
26,602,183

 
75

 
11,582,623

 
28

Roche
6,107,254

 
14

 
4,917,929

 
14

 
10,778,688

 
27

NIAID
—

 
—

 
118,171

 
—

 
901,475

 
2

GeneOne (affiliated entity)
551,208

 
1

 
1,188,432

 
4

 
450,000

 
1

All other
3,307,924

 
8

 
1,023,007

 
3

 
821,594

 
2

Total revenue
$
42,220,086

 
100
%
 
$
35,368,361

 
100
%
 
$
40,572,111

 
100
%