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Goodwill and Intangible Assets (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jan. 31, 2005
Inovio AS [Member]
Jun. 30, 2009
VGX [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Patents [Member]
Dec. 31, 2011
Patents [Member]
Dec. 31, 2012
Patents [Member]
Minimum [Member]
Dec. 31, 2012
Patents [Member]
Maximum [Member]
Dec. 31, 2012
Licenses [Member]
Dec. 31, 2011
Licenses [Member]
Dec. 31, 2012
Licenses [Member]
Minimum [Member]
Dec. 31, 2012
Licenses [Member]
Maximum [Member]
Dec. 31, 2012
CELLECTRA [Member]
Dec. 31, 2011
CELLECTRA [Member]
Dec. 31, 2012
CELLECTRA [Member]
Minimum [Member]
Dec. 31, 2012
CELLECTRA [Member]
Maximum [Member]
Dec. 31, 2012
GHRH [Member]
Dec. 31, 2011
GHRH [Member]
Dec. 31, 2012
Other [Member]
Dec. 31, 2011
Other [Member]
Schedule of intangible assets by major asset class                                            
Useful Life (Yrs)         5 years 18 years     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]                                        
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 (12,128,558) (10,307,388)         (4,852,673) (4,526,488)     (1,046,870) (1,018,122)     (4,334,234) [1] (3,124,680) [1]     (113,531) [1] (81,848) [1] (1,781,250) [2] (1,556,250) [2]
Intangible assets, Net Book Value 7,489,315 9,310,485         949,855 1,276,040     276,891 305,639     3,772,036 [1] 4,981,590 [1]     221,783 [1] 253,466 [1] 2,268,750 [2] 2,493,750 [2]
Total goodwill and intangible assets, Gross 29,731,244 29,731,244                                        
Total goodwill and intangible assets, Net Book Value 17,602,686 19,423,856                                        
Recorded goodwill on acquisition     $ 3,900,000 $ 6,200,000                                    
[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.