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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Grant revenue $ 428,081 $ 882,956 $ 2,417,550
Operating expenses:      
Research and development 1,693,102 1,812,969 2,914,878
General and administrative 1,429,731 1,807,605 1,792,160
Total operating expenses 3,122,833 3,620,574 4,707,038
Loss from operations (2,694,752) (2,737,618) (2,289,488)
Other income:      
Interest income 5,465 4,063 4,545
Total other income 5,465 4,063 4,545
Net loss $ (2,689,287) $ (2,733,555) $ (2,284,943)
Basic and diluted:      
Loss per common share (in dollars per share) $ (0.08) $ (0.10) $ (0.11)
Weighted average shares outstanding (in shares) 31,950,813 26,645,140 21,212,327