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Consolidated Statements of Comprehensive Loss - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net loss $ (120,551,777) $ (96,967,830) $ (88,205,772)
Other comprehensive income (loss):      
Unrealized loss on investment in affiliated entity, net of tax 0 0 (1,452,431)
Unrealized gain (loss) on short-term investments, net of tax 1,001,475 (180,496) 7,458
Comprehensive loss (119,550,302) (97,148,326) (89,650,745)
Comprehensive loss attributable to non-controlling interest 1,192,558 0 0
Comprehensive loss attributable to Inovio Pharmaceuticals, Inc. $ (118,357,744) $ (97,148,326) $ (89,650,745)