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Consolidated Statements of Operations (USD $)
 12 Months Ended 138 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Grant revenue $ 2,657,327 $ 4,899,885 $ 5,185,257 $ 22,969,019
Operating expenses:        
Research and development 3,043,522 4,276,375 4,793,956 28,674,198
General and administrative 1,752,765 2,972,555 3,162,134 19,400,424
4,796,287 7,248,930 7,956,090 48,074,622
Loss from operations (2,138,960) (2,349,045) (2,770,833) (25,105,603)
Other income (expense):        
Interest income 3,820 2,219 23,505 344,130
Interest expense       (5,669)
3,820 2,219 23,505 338,461
Net loss $ (2,135,140) $ (2,346,826) $ (2,747,328) $ (24,767,142)
Basic and diluted:        
Loss per common share (in Dollars per share) $ (0.12) $ (0.15) $ (0.18) $ (2.09)
Weighted average shares outstanding (in Shares) 18,315,669 15,735,541 15,651,308 11,871,955