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Goodwill and Intangible Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2005
Jun. 30, 2009
Non-Amortizing:        
Goodwill, Gross 10,113,371us-gaap_GoodwillGross [1] $ 10,113,371us-gaap_GoodwillGross [1]    
Goodwill, Net Book Value 10,113,371us-gaap_Goodwill [1] 10,113,371us-gaap_Goodwill [1]    
Amortizing:        
Intangible assets, Gross 19,617,873us-gaap_FiniteLivedIntangibleAssetsGross 19,617,873us-gaap_FiniteLivedIntangibleAssetsGross    
Intangible assets, Accumulated Amortization (14,841,814)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (13,899,095)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization    
Intangible assets, Net Book Value 4,776,059us-gaap_FiniteLivedIntangibleAssetsNet 5,718,778us-gaap_FiniteLivedIntangibleAssetsNet    
Total goodwill and intangible assets, Gross 29,731,244ino_GoodwillAndIntangibleAssetsGross 29,731,244ino_GoodwillAndIntangibleAssetsGross    
Total goodwill and intangible assets, Net Book Value 14,889,430ino_GoodwillAndIntangibleAssetsNet 15,832,149ino_GoodwillAndIntangibleAssetsNet    
Inovio AS        
Non-Amortizing:        
Goodwill, Net Book Value     3,900,000us-gaap_Goodwill
/ us-gaap_IncomeStatementLocationAxis
= ino_InovioAsMember		  
VGX        
Non-Amortizing:        
Goodwill, Net Book Value       6,200,000us-gaap_Goodwill
/ us-gaap_IncomeStatementLocationAxis
= ino_VgxPharmaceuticalsMember
Minimum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 5 years      
Maximum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 18 years      
Patents        
Amortizing:        
Intangible assets, Gross 5,802,528us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 5,802,528us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		    
Intangible assets, Accumulated Amortization (5,358,433)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 (5,128,227)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		    
Intangible assets, Net Book Value 444,095us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 674,301us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		    
Patents | Minimum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 8 years      
Patents | Maximum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 17 years      
Licenses        
Amortizing:        
Intangible assets, Gross 1,323,761us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 1,323,761us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		    
Intangible assets, Accumulated Amortization (1,104,366)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 (1,075,617)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		    
Intangible assets, Net Book Value 219,395us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 248,144us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		    
Licenses | Minimum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 8 years      
Licenses | Maximum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 17 years      
CELLECTRA        
Amortizing:        
Intangible assets, Gross 8,106,270us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2] 8,106,270us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2]    
Intangible assets, Accumulated Amortization (5,970,866)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2] (5,543,786)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2]    
Intangible assets, Net Book Value 2,135,404us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2] 2,562,484us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2]    
CELLECTRA | Minimum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 5 years [2]      
CELLECTRA | Maximum        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 11 years [2]      
GHRH        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 11 years [2]      
Amortizing:        
Intangible assets, Gross 335,314us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2] 335,314us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2]    
Intangible assets, Accumulated Amortization (176,899)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2] (145,215)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2]    
Intangible assets, Net Book Value 158,415us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2] 190,099us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2]    
Other        
Schedule of intangible assets by major asset class        
Useful Life (Yrs) 18 years [3]      
Amortizing:        
Intangible assets, Gross 4,050,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3] 4,050,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3]    
Intangible assets, Accumulated Amortization (2,231,250)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3] (2,006,250)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3]    
Intangible assets, Net Book Value 1,818,750us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3] $ 2,043,750us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3]    
[1] Goodwill was recorded from the Inovio AS acquisition in January 2005 and from the acquisition of VGX in June 2009 for $3.9 million and $6.2 million, respectively.
[2] CELLECTRA® and GHRH are developed technologies which were recorded from the acquisition of VGX.
[3] Other intangible assets represent the fair value of acquired intellectual property from the Inovio AS acquisition.