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Consolidated Statements of Operations (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 138 Months Ended 147 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Sep. 30, 2013
Grant revenue $ 1,004,211 $ 638,000 $ 2,242,812 $ 2,197,761 $ 2,657,327 $ 4,899,885 $ 5,185,257 $ 22,969,019 $ 25,211,831
Operating expenses:                  
Research and development 879,104 601,690 2,314,291 2,386,460 3,043,522 4,276,375 4,793,956 28,674,198 30,988,489
General and administrative 316,452 334,166 1,345,179 1,339,300 1,752,765 2,972,555 3,162,134 19,400,424 20,745,603
Total operating expenses 1,195,556 935,856 3,659,470 3,725,760 4,796,287 7,248,930 7,956,090 48,074,622 51,734,092
Loss from operations (191,345) (297,856) (1,416,658) (1,527,999) (2,138,960) (2,349,045) (2,770,833) (25,105,603) (26,522,261)
Other income (expense):                  
Interest income 1,197 1,077 3,429 2,944 3,820 2,219 23,505 344,130 347,559
Interest expense               (5,669) (5,669)
Total other income (expense) 1,197 1,077 3,429 2,944 3,820 2,219 23,505 338,461 341,890
Net loss $ (190,148) $ (296,779) $ (1,413,229) $ (1,525,055) $ (2,135,140) $ (2,346,826) $ (2,747,328) $ (24,767,142) $ (26,180,371)
Basic and diluted:                  
Loss per common share (in Dollars per share) $ (0.01) $ (0.02) $ (0.07) $ (0.09) $ (0.12) $ (0.15) $ (0.18) $ (2.09) $ (2.18)
Weighted average shares outstanding (in Shares) 21,666,610 18,497,886 20,979,675 17,400,665 18,315,669 15,735,541 15,651,308 11,871,955 12,026,183