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Net Loss Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator        
Net loss attributable to Inovio Pharmaceuticals, Inc. $ (6,248,250) $ (10,711,274) $ (16,830,029) $ (21,532,734)
Reflect adjustment for decrease in fair value of warrant liability (22,727) (873,389) (312,500) (615,684)
Numerator for use in diluted loss per share $ (6,270,977) $ (11,584,663) $ (17,142,529) $ (22,148,418)
Denominator        
Weighted average number of common shares outstanding (shares) 67,655,975 60,232,498 64,198,528 57,722,938
Effect of dilutive potential common shares from warrants (shares) 182,763 242,361 177,995 253,517
Denominator for use in diluted loss per share (shares) 67,838,738 60,474,859 64,376,523 57,976,455
Net loss per share, diluted ($ per share) $ (0.09) $ (0.19) $ (0.27) $ (0.38)
Antidilutive securities excluded from computation of earnings per share, amount (shares)     6,853,635 6,037,409
Options to purchase commons stock [Member]        
Denominator        
Antidilutive securities excluded from computation of earnings per share, amount (shares)     5,987,210 4,943,567
Warrants to purchase common stock [Member]        
Denominator        
Antidilutive securities excluded from computation of earnings per share, amount (shares)     627,969 1,085,386
Restricted stock units [Member]        
Denominator        
Antidilutive securities excluded from computation of earnings per share, amount (shares)     230,000 0
Convertible preferred stock [Member]        
Denominator        
Antidilutive securities excluded from computation of earnings per share, amount (shares)     8,456 8,456