Net Loss Per Share (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator
Net loss attributable to Inovio Pharmaceuticals, Inc.	$ (10,581,779)us-gaap_NetIncomeLoss	$ (10,821,460)us-gaap_NetIncomeLoss
Reflect adjustment for decrease in fair value of warrant liability	(289,773)	0
Numerator for use in diluted loss per share	$ (10,871,552)	$ (10,821,460)
Denominator
Weighted average number of common shares outstanding (shares)	60,741,082	55,159,002
Effect of dilutive potential common shares from warrants (shares)	172,341	0
Denominator for use in diluted loss per share (shares)	60,913,423	55,159,002
Net loss per share, diluted ($ per share)	$ (0.18)us-gaap_EarningsPerShareDiluted	$ (0.20)us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from computation of earnings per share, amount (shares)	6,797,192	6,360,446
Stock Options [Member]
Denominator
Antidilutive securities excluded from computation of earnings per share, amount (shares)	5,930,767	4,737,095
Warrant [Member]
Denominator
Antidilutive securities excluded from computation of earnings per share, amount (shares)	727,969	1,613,793
Restricted Stock Units (RSUs) [Member]
Denominator
Antidilutive securities excluded from computation of earnings per share, amount (shares)	130,000	0
Convertible Preferred Stock [Member]
Denominator
Antidilutive securities excluded from computation of earnings per share, amount (shares)	8,456	9,558

Adjustment for Change in Fair Value of Warrant Liability

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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