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Basis of Presentation (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash, cash equivalents, and short-term investments $ 85,500,000    
Long-term investments 12,700,000    
Proceeds from issuance of stock $ 14,923,263 $ 94,347,922  
VGX Animal Health, Inc      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Noncontrolling interest, ownership percentage by noncontrolling owners 15.00%    
Common Stock | Sales Agreement      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Remaining authorized amount $ 86,400,000    
Proceeds from issuance of stock $ 14,900,000    
Common Stock | Underwritten Public Offering And Sales Agreement      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Proceeds from issuance of stock     $ 94,300,000