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Investments in Affiliated Entities (Details) - USD ($)
Dec. 31, 2015
Jul. 01, 2015
May. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]        
Percentage of ownership     20.00%  
Carryover basis   $ 0    
Fair Value, Inputs, Level 1 | Common stock        
Related Party Transaction [Line Items]        
Number of shares owned 395,758      
VGX International        
Related Party Transaction [Line Items]        
Percentage of ownership 10.20%     10.20%
Plumbline Life Sciences        
Related Party Transaction [Line Items]        
Percentage of ownership 16.90%