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Summary of Significant Accounting Policies - Calculation of Net Loss Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net loss attributable to Inovio Pharmaceuticals, Inc.	$ (37,662,038)	$ (23,090,693)	$ (29,387,226)	$ (29,219,262)					$ (119,359,219)	$ (96,967,830)	$ (88,205,772)
Adjustment for decrease in fair value of warrant liability									0	0	(806,819)
Numerator for use in diluted net loss per share									$ (119,359,219)	$ (96,967,830)	$ (89,012,591)
Denominator
Weighted average number of common shares outstanding (denominator for use in basic net loss per share) (shares)									98,717,999	92,539,997	81,777,493
Effect of dilutive potential common shares (shares)									0	0	140,529
Denominator for use in diluted loss per share (shares)									98,717,999	92,539,997	81,918,022
Net loss per share, diluted ($ per share)	$ (0.38)	$ (0.25)	$ (0.30)	$ (0.30)	$ (0.34)	$ (0.27)	$ (0.08)	$ (0.36)	$ (1.21)	$ (1.05)	$ (1.09)
Net loss per share, basic ($ per share)	$ (0.38)	$ (0.23)	$ (0.30)	$ (0.30)	$ (0.34)	$ (0.27)	$ (0.07)	$ (0.36)	$ (1.21)	$ (1.05)	$ (1.08)

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