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Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2016
Jun. 30, 2009
Jan. 31, 2005
Indefinite lived:          
Goodwill $ 10,513,371 $ 10,513,371      
Definite lived:          
Intangible assets, Gross 24,717,873 24,717,873      
Intangible assets, Accumulated Amortization (21,024,022) (19,957,728)      
Intangible assets, net book value 3,693,851 4,760,145      
Total goodwill and intangible assets, Gross 35,231,244 35,231,244      
Total goodwill and intangible assets, Net Book Value $ 14,207,222 15,273,516      
Inovio AS          
Indefinite lived:          
Goodwill         $ 3,900,000
VGX          
Indefinite lived:          
Goodwill       $ 6,200,000  
Bioject          
Indefinite lived:          
Goodwill     $ 400,000    
Weighted Average          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 11 years        
Patents          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 17 years        
Definite lived:          
Intangible assets, Gross $ 5,802,528 5,802,528      
Intangible assets, Accumulated Amortization (5,802,528) (5,742,079)      
Intangible assets, net book value $ 0 60,449      
Patents | Weighted Average          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 10 years        
Licenses          
Definite lived:          
Intangible assets, Gross $ 1,323,761 1,323,761      
Intangible assets, Accumulated Amortization (1,248,104) (1,219,357)      
Intangible assets, net book value $ 75,657 104,404      
Licenses | Weighted Average          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 10 years        
CELLECTRA          
Definite lived:          
Intangible assets, Gross $ 8,106,270 8,106,270      
Intangible assets, Accumulated Amortization (8,106,270) (7,679,190)      
Intangible assets, net book value $ 0 427,080      
CELLECTRA | Weighted Average          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 8 years        
GHRH          
Definite lived:          
Intangible assets, Gross $ 335,314 335,314      
Intangible assets, Accumulated Amortization (335,314) (303,630)      
Intangible assets, net book value $ 0 31,684      
GHRH | Weighted Average          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 11 years        
Bioject          
Definite lived:          
Intangible assets, Gross $ 5,100,000 5,100,000      
Intangible assets, Accumulated Amortization (2,175,556) (1,882,222)      
Intangible assets, net book value $ 2,924,444 3,217,778      
Bioject | Weighted Average          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 12 years        
Other          
Definite lived:          
Intangible assets, Gross $ 4,050,000 4,050,000      
Intangible assets, Accumulated Amortization (3,356,250) (3,131,250)      
Intangible assets, net book value $ 693,750 $ 918,750      
Other | Weighted Average          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 18 years