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Summary of Significant Accounting Policies - Net Loss Per Share Table (Details) (USD $) | 3 Months Ended | 12 Months Ended
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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 | 0 ino_AdjustmentforChangeinFairValueofWarrantLiability | 0 ino_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) | 60,610,367 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 60,392,911 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 60,232,498 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 55,159,002 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 52,127,419 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 47,989,039 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,988,704 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,038,883 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 59,127,349 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46,087,773 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 34,127,312 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive potential common shares from warrants (shares) |  |  |  |  |  |  |  |  | 280,903 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 0 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 0 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Denominator for use in diluted loss per share (shares) | 60,805,871 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 60,602,831 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 60,474,859 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 55,159,002 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,127,419 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 47,989,039 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,988,704 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 39,038,883 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 59,408,252 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 46,087,773 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 34,127,312 us-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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