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Consolidated Statements of Operations (USD $)
 12 Months Ended 126 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Grant revenue $ 4,899,885 $ 5,185,257 $ 3,668,195 $ 20,311,692
Operating expenses:        
Research and development 4,276,375 4,793,956 4,068,682 25,630,676
General and administrative 2,972,555 3,162,134 2,914,845 17,647,659
7,248,930 7,956,090 6,983,527 43,278,335
Loss from operations (2,349,045) (2,770,833) (3,315,332) (22,966,643)
Other income (expense):        
Interest income 2,219 23,505 31,080 340,310
Interest expense       (5,669)
2,219 23,505 31,080 334,641
Net loss $ (2,346,826) $ (2,747,328) $ (3,284,252) $ (22,632,002)
Basic and diluted:        
Loss per common share (in Dollars per share) $ (0.15) $ (0.18) $ (0.22) $ (2.11)
Weighted average shares outstanding (in Shares) 15,735,541 15,651,308 15,191,278 10,704,803