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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Grant revenue $ 882,956 $ 2,417,550 $ 2,657,327
Operating expenses:      
Research and development 1,812,969 2,914,878 3,043,522
General and administrative 1,807,605 1,792,160 1,752,765
Total operating expenses 3,620,574 4,707,038 4,796,287
Loss from operations (2,737,618) (2,289,488) (2,138,960)
Other income:      
Interest income 4,063 4,545 3,820
Total other income 4,063 4,545 3,820
Net loss $ (2,733,555) $ (2,284,943) $ (2,135,140)
Basic and diluted:      
Loss per common share (in dollars per share) $ (0.10) $ (0.11) $ (0.12)
Weighted average shares outstanding (in shares) 26,645,140 21,212,327 18,315,669