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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 141 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Grant revenue $ 797,040 $ 854,063 $ 23,766,059
Operating expenses:      
Research and development 881,988 1,072,354 29,556,186
General and administrative 612,943 512,818 20,013,367
Total operating expenses 1,494,931 1,585,172 49,569,553
Loss from operations (697,891) (731,109) (25,803,494)
Other income (expense):      
Interest income 1,094 596 345,224
Interest expense     (5,669)
Total other income 1,094 596 339,555
Net loss $ (696,797) $ (730,513) $ (25,463,939)
Basic and diluted:      
Loss per common share (in Dollars per share) $ (0.03) $ (0.04) $ (1.84)
Weighted average shares outstanding (in Shares) 20,166,240 16,716,566 13,837,933