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Investments in Affiliated Entities (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Jul. 01, 2015
Related Party Transaction [Line Items]      
Carryover basis     $ 0
Fair Value, Inputs, Level 1 | Common stock      
Related Party Transaction [Line Items]      
Number of shares owned 395,758 395,758  
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 16.80% 16.80%