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Goodwill and Intangible Assets (Details) (USD $)
 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Patents [Member]
Dec. 31, 2013
Patents [Member]
Sep. 30, 2014
Patents [Member]
Minimum [Member]
Dec. 31, 2013
Patents [Member]
Minimum [Member]
Sep. 30, 2014
Patents [Member]
Maximum [Member]
Dec. 31, 2013
Patents [Member]
Maximum [Member]
Sep. 30, 2014
Licenses [Member]
Dec. 31, 2013
Licenses [Member]
Sep. 30, 2014
Licenses [Member]
Minimum [Member]
Dec. 31, 2013
Licenses [Member]
Minimum [Member]
Sep. 30, 2014
Licenses [Member]
Maximum [Member]
Dec. 31, 2013
Licenses [Member]
Maximum [Member]
Sep. 30, 2014
CELLECTRA [Member]
Dec. 31, 2013
CELLECTRA [Member]
Sep. 30, 2014
CELLECTRA [Member]
Minimum [Member]
Dec. 31, 2013
CELLECTRA [Member]
Minimum [Member]
Sep. 30, 2014
CELLECTRA [Member]
Maximum [Member]
Dec. 31, 2013
CELLECTRA [Member]
Maximum [Member]
Sep. 30, 2014
GHRH [Member]
Dec. 31, 2013
GHRH [Member]
Sep. 30, 2014
Other [Member]
Dec. 31, 2013
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 8 years 17 years 17 years     8 years 8 years 17 years 17 years     5 years [1] 5 years [1] 11 years [1] 11 years [1] 11 years [1] 11 years [1] 18 years [2] 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 (14,611,215) (13,899,095) (5,305,963) (5,128,227)         (1,097,178) (1,075,617)         (5,864,096) [1] (5,543,786) [1]         (168,978) [1] (145,215) [1] (2,175,000) [2] (2,006,250) [2]    
Intangible assets, Net Book Value 5,006,658 5,718,778 496,565 674,301         226,583 248,144         2,242,174 [1] 2,562,484 [1]         166,336 [1] 190,099 [1] 1,875,000 [2] 2,043,750 [2]    
Total goodwill and intangible assets, Gross 29,731,244 29,731,244                                                
Total goodwill and intangible assets, Net Book Value $ 15,120,029 $ 15,832,149                                                
[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 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.