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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended 132 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Grant revenue $ 705,698 $ 1,753,033 $ 1,559,761 $ 2,646,035 $ 21,871,453
Operating expenses:          
Research and development 712,416 1,385,452 1,784,770 2,223,919 27,415,446
General and administrative 492,316 579,380 1,005,134 1,241,193 18,652,793
Total operating expenses 1,204,732 1,964,832 2,789,904 3,465,112 46,068,239
Loss from operations (499,034) (211,799) (1,230,143) (819,077) (24,196,786)
Other income (expense):          
Interest income 1,271 455 1,867 1,451 342,177
Interest expense         (5,669)
Total other income (expense) 1,271 455 1,867 1,451 336,508
Net loss $ (497,763) $ (211,344) $ (1,228,276) $ (817,626) $ (23,860,278)
Basic and diluted:          
Loss per common share (in Dollars per share) $ (0.03) $ (0.01) $ (0.07) $ (0.05) $ (2.16)
Weighted average shares outstanding (in Shares) 17,827,313 15,714,932 17,271,940 15,686,112 11,030,299