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Goodwill and Intangible Assets (Details) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Patents [Member]
Dec. 31, 2012
Patents [Member]
Jun. 30, 2013
Patents [Member]
Minimum [Member]
Jun. 30, 2013
Patents [Member]
Maximum [Member]
Jun. 30, 2013
Licenses [Member]
Dec. 31, 2012
Licenses [Member]
Jun. 30, 2013
Licenses [Member]
Minimum [Member]
Jun. 30, 2013
Licenses [Member]
Maximum [Member]
Jun. 30, 2013
CELLECTRA [Member]
Dec. 31, 2012
CELLECTRA [Member]
Jun. 30, 2013
CELLECTRA [Member]
Minimum [Member]
Jun. 30, 2013
CELLECTRA [Member]
Maximum [Member]
Jun. 30, 2013
GHRH [Member]
Dec. 31, 2012
GHRH [Member]
Jun. 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]                                    
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 (13,021,586) (12,128,558) (4,998,210) (4,852,673)     (1,061,243) (1,046,870)     (4,939,009) [1] (4,334,234) [1]     (129,374) [1] (113,531) [1] (1,893,750) [2] (1,781,250) [2]    
Intangible assets, Net Book Value 6,596,287 7,489,315 804,318 949,855     262,518 276,891     3,167,261 [1] 3,772,036 [1]     205,940 [1] 221,783 [1] 2,156,250 [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 16,709,658 17,602,686                                    
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.