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Net Loss Per Share (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator [Abstract]        
Net loss attributable to Inovio Pharmaceuticals, Inc. $ (7,177,575) $ (30,877,410) $ (28,710,309) $ (50,574,118)
Reflect adjustment for decrease in fair value of warrant liability (271,022) 0 (1,996,544) 0
Numerator for use in diluted loss per share $ (7,448,597) $ (30,877,410) $ (30,706,853) $ (50,574,118)
Denominator [Abstract]        
Weighted average number of common shares outstanding 60,392,911 47,989,039 58,625,740 44,045,769
Effect of dilutive potential common shares from warrants 209,920 0 310,674 0
Denominator for use in diluted loss per share 60,602,831 47,989,039 58,936,414 44,045,769
Net loss per share, diluted $ (0.12) $ (0.64) $ (0.52) $ (1.15)
Antidilutive securities excluded from computation of earnings per share, amount 5,820,385 7,914,923    
Stock Options [Member]
        
Denominator [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount 4,833,877 4,245,550    
Warrant [Member]
        
Denominator [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount 978,052 3,659,815    
Convertible Preferred Stock [Member]
        
Denominator [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount 8,456 9,558.25