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Summary of Significant Accounting Policies - Net Loss Per Share Table (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator [Abstract]
Net loss attributable to Inovio Pharmaceuticals, Inc.					$ (17,952,045)	$ 5,594,468	$ (6,248,250)	$ (10,581,779)	$ (73,740,339)	$ (29,187,606)	$ (36,121,713)
Reflect adjustment for decrease in fair value of warrant liability									0	(721,591)	(2,181,203)
Numerator for use in diluted loss per share									$ (73,740,339)	$ (29,909,197)	$ (38,302,916)
Denominator [Abstract]
Weighted average number of common shares outstanding (shares)									73,214,766	68,198,142	59,127,349
Effect of dilutive potential common shares from warrants (shares)									0	167,123	280,903
Denominator for use in diluted loss per share (shares)									73,214,766	68,365,265	59,408,252
Net loss per share, Diluted ($ per share)	$ (0.36)	$ (0.28)	$ (0.26)	$ (0.11)	$ (0.25)	$ 0.07	$ (0.09)	$ (0.18)	$ (1.01)	$ (0.44)	$ (0.64)

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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