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Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2016
Jun. 30, 2009
Jan. 31, 2005
Indefinite lived:          
Goodwill, Gross $ 10,513,371 $ 10,513,371      
Goodwill 10,513,371 10,513,371      
Definite lived:          
Intangible assets, Gross 24,717,873 24,717,873      
Intangible assets, Accumulated Amortization (19,957,728) (18,708,144)      
Intangible assets, net book value 4,760,145 6,009,729      
Total goodwill and intangible assets, Gross 35,231,244 35,231,244      
Total goodwill and intangible assets, Net Book Value $ 15,273,516 16,523,100      
Inovio AS          
Indefinite lived:          
Goodwill         $ 3,900,000
VGX          
Indefinite lived:          
Goodwill       $ 6,200,000  
Bioject          
Indefinite lived:          
Goodwill     $ 400,000    
Minimum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 2 years        
Maximum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 18 years        
Patents          
Definite lived:          
Intangible assets, Gross $ 5,802,528 5,802,528      
Intangible assets, Accumulated Amortization (5,742,079) (5,681,673)      
Intangible assets, net book value $ 60,449 120,855      
Patents | Minimum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 8 years        
Patents | Maximum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 17 years        
Licenses          
Definite lived:          
Intangible assets, Gross $ 1,323,761 1,323,761      
Intangible assets, Accumulated Amortization (1,219,357) (1,190,609)      
Intangible assets, net book value $ 104,404 133,152      
Licenses | Minimum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 8 years        
Licenses | Maximum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 17 years        
CELLECTRA          
Definite lived:          
Intangible assets, Gross $ 8,106,270 8,106,270      
Intangible assets, Accumulated Amortization (7,679,190) (7,252,108)      
Intangible assets, net book value $ 427,080 854,162      
CELLECTRA | Minimum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 5 years        
CELLECTRA | Maximum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 11 years        
GHRH          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 11 years        
Definite lived:          
Intangible assets, Gross $ 335,314 335,314      
Intangible assets, Accumulated Amortization (303,630) (271,948)      
Intangible assets, net book value 31,684 63,366      
Bioject          
Definite lived:          
Intangible assets, Gross 5,100,000 5,100,000      
Intangible assets, Accumulated Amortization (1,882,222) (1,405,556)      
Intangible assets, net book value $ 3,217,778 3,694,444      
Bioject | Minimum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 2 years        
Bioject | Maximum          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 15 years        
Other          
Schedule of intangible assets by major asset class          
Intangible asset, useful life 18 years        
Definite lived:          
Intangible assets, Gross $ 4,050,000 4,050,000      
Intangible assets, Accumulated Amortization (3,131,250) (2,906,250)      
Intangible assets, net book value $ 918,750 $ 1,143,750