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Summary of Significant Accounting Policies - Net Loss Per Share Table (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator [Abstract]
Net loss attributable to Inovio Pharmaceuticals, Inc.	$ (7,411,404)us-gaap_NetIncomeLoss	$ (7,177,575)us-gaap_NetIncomeLoss	$ (10,711,274)us-gaap_NetIncomeLoss	$ (10,821,460)us-gaap_NetIncomeLoss	$ (15,454,330)us-gaap_NetIncomeLoss	$ (30,877,410)us-gaap_NetIncomeLoss	$ (10,852,588)us-gaap_NetIncomeLoss	$ (8,844,120)us-gaap_NetIncomeLoss	$ (36,121,713)us-gaap_NetIncomeLoss	$ (66,028,448)us-gaap_NetIncomeLoss	$ (19,668,955)us-gaap_NetIncomeLoss
Reflect adjustment for decrease in fair value of warrant liability									(2,181,203)ino_AdjustmentforChangeinFairValueofWarrantLiability	0ino_AdjustmentforChangeinFairValueofWarrantLiability	0ino_AdjustmentforChangeinFairValueofWarrantLiability
Numerator for use in diluted loss per share									$ (38,302,916)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (66,028,448)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (19,668,955)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator [Abstract]
Weighted average number of common shares outstanding (shares)	60,610,367us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	60,392,911us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	60,232,498us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	55,159,002us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	52,127,419us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	47,989,039us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,988,704us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,038,883us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	59,127,349us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	46,087,773us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	34,127,312us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive potential common shares from warrants (shares)									280,903us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Denominator for use in diluted loss per share (shares)	60,805,871us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	60,602,831us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	60,474,859us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	55,159,002us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	52,127,419us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	47,989,039us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,988,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,038,883us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	59,408,252us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	46,087,773us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	34,127,312us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings Per Share, Diluted ($ per share)	$ (0.12)us-gaap_EarningsPerShareDiluted	$ (0.12)us-gaap_EarningsPerShareDiluted	$ (0.19)us-gaap_EarningsPerShareDiluted	$ (0.20)us-gaap_EarningsPerShareDiluted	$ (0.30)us-gaap_EarningsPerShareDiluted	$ (0.64)us-gaap_EarningsPerShareDiluted	$ (0.24)us-gaap_EarningsPerShareDiluted	$ (0.23)us-gaap_EarningsPerShareDiluted	$ (0.64)us-gaap_EarningsPerShareDiluted	$ (1.43)us-gaap_EarningsPerShareDiluted	$ (0.58)us-gaap_EarningsPerShareDiluted

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Adjustment for Change in Fair Value of Warrant Liability

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