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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, 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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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