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Goodwill and Intangible Assets (Details) (USD $) |  |  |  |  | 9 Months Ended |  |  | 9 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended |  |  |
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Patents [Member] | Dec. 31, 2012 Patents [Member] | Sep. 30, 2013 Patents [Member] Minimum [Member] | Sep. 30, 2013 Patents [Member] Maximum [Member] | Sep. 30, 2013 Licences [Member] | Dec. 31, 2012 Licences [Member] | Sep. 30, 2013 Licences [Member] Minimum [Member] | Sep. 30, 2013 Licences [Member] Maximum [Member] | Sep. 30, 2013 CELLECTRA [Member] | Dec. 31, 2012 CELLECTRA [Member] | Sep. 30, 2013 CELLECTRA [Member] Minimum [Member] | Sep. 30, 2013 CELLECTRA [Member] Maximum [Member] | Sep. 30, 2013 GHRH [Member] | Dec. 31, 2012 GHRH [Member] | Sep. 30, 2013 Other [Member] | Dec. 31, 2012 Other [Member] | Jan. 31, 2005 Inovio AS [Member] | Jun. 30, 2009 VGX [Member]
Schedule of intangible assets by major asset class |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful Life |  |  |  |  |  |  | 8 years | 17 years |  |  | 8 years | 17 years |  |  |  |  | 5 years | [1] | 11 years | [1] | 11 years | [1] |  |  | 18 years | [2] |  |  |  |
Non-Amortizing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Gross | $ 10,113,371 | [3] | $ 10,113,371 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net Book Value | 10,113,371 | [3] | 10,113,371 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,900,000 | 6,200,000
Amortizing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, Gross | 19,617,873 |  | 19,617,873 |  | 5,802,528 | 5,802,528 |  |  | 1,323,761 | 1,323,761 |  |  | 8,106,270 | [1] | 8,106,270 | [1] |  |  |  |  | 335,314 | [1] | 335,314 | [1] | 4,050,000 | [2] | 4,050,000 | [2] |  |
Intangible assets, Accumulated Amortization | (13,461,238) |  | (12,128,558) |  | (5,064,115) | (4,852,673) |  |  | (1,068,431) | (1,046,870) |  |  | (5,241,398) | [1] | (4,334,234) | [1] |  |  |  |  | (137,294) | [1] | (113,531) | [1] | (1,950,000) | [2] | (1,781,250) | [2] |  |
Intangible assets, Net Book Value | 6,156,635 |  | 7,489,315 |  | 738,413 | 949,855 |  |  | 255,330 | 276,891 |  |  | 2,864,872 | [1] | 3,772,036 | [1] |  |  |  |  | 198,020 | [1] | 221,783 | [1] | 2,100,000 | [2] | 2,268,750 | [2] |  |
Total goodwill and intangible assets, Gross | 29,731,244 |  | 29,731,244 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total goodwill and intangible assets, Net Book Value | $ 16,270,006 |  | $ 17,602,686 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | CELLECTRA® and GHRH are developed technologies which were recorded from the acquisition of VGX.
[2] | Other intangible assets represent the fair value of acquired contracts and intellectual property from the Inovio AS acquisition.
[3] | Goodwill was recorded from the Inovio AS acquisition in January 2005 and from the acquisition of VGX in June 2009 for $3.9 million and $6.2 million, respectively.

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