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Goodwill and Intangible Assets (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
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.