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Goodwill and Intangible Assets (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
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 (15,065,299)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (14,841,814)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization    
Intangible assets, Net Book Value 4,552,574us-gaap_FiniteLivedIntangibleAssetsNet 4,776,059us-gaap_FiniteLivedIntangibleAssetsNet    
Total goodwill and intangible assets, Gross 29,731,244ino_GoodwillAndIntangibleAssetsGross 29,731,244ino_GoodwillAndIntangibleAssetsGross    
Total goodwill and intangible assets, Net Book Value 14,665,945ino_GoodwillAndIntangibleAssetsNet 14,889,430ino_GoodwillAndIntangibleAssetsNet    
Inovio AS [Member]        
Non-Amortizing:        
Goodwill, Net Book Value     3,900,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ino_InovioAsMember		  
VGX [Member]        
Non-Amortizing:        
Goodwill, Net Book Value       6,200,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ino_VgxPharmaceuticalsMember
Patents [Member]        
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 (5,403,792)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 (5,358,433)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		    
Intangible assets, Net Book Value 398,736us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 444,095us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		    
Patents [Member] | Minimum [Member]        
Schedule of intangible assets by major asset class        
Useful Life 8 years      
Patents [Member] | Maximum [Member]        
Schedule of intangible assets by major asset class        
Useful Life 17 years      
Licenses [Member]        
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 (1,111,552)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 (1,104,366)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		    
Intangible assets, Net Book Value 212,209us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 219,395us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		    
Licenses [Member] | Minimum [Member]        
Schedule of intangible assets by major asset class        
Useful Life 8 years      
Licenses [Member] | Maximum [Member]        
Schedule of intangible assets by major asset class        
Useful Life 17 years      
CELLECTRA [Member]        
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 (6,077,637)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2] (5,970,866)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2]    
Intangible assets, Net Book Value 2,028,633us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2] 2,135,404us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_CellectraMember		 [2]    
CELLECTRA [Member] | Minimum [Member]        
Schedule of intangible assets by major asset class        
Useful Life 5 years [2]      
CELLECTRA [Member] | Maximum [Member]        
Schedule of intangible assets by major asset class        
Useful Life 11 years [2]      
GHRH [Member]        
Schedule of intangible assets by major asset class        
Useful Life 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 (184,818)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2] (176,899)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2]    
Intangible assets, Net Book Value 150,496us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2] 158,415us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ino_GhrhMember		 [2]    
Other [Member]        
Schedule of intangible assets by major asset class        
Useful Life 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 (2,287,500)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3] (2,231,250)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3]    
Intangible assets, Net Book Value 1,762,500us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 [3] $ 1,818,750us-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.