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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Mar. 09, 2015
Jun. 30, 2014
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Entity Registrant Name INOVIO PHARMACEUTICALS, INC.    
Entity Central Index Key 0001055726    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   60,741,082dei_EntityCommonStockSharesOutstanding  
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 614,635,315dei_EntityPublicFloat
Entity Current Reporting Status Yes    
Entity Voluntary Filers No