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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenue:        
Revenue from licensing agreements, grants and other $ 60,739 $ 41,265 $ 471,501 $ 162,614
Revenue from product sales 203,256 182,321 685,364 516,536
Total revenue 263,995 223,586 1,156,865 679,150
Cost of product sales 71,891 60,501 208,127 167,390
Gross profit 192,104 163,085 948,738 511,760
Operating expenses:        
Research and development 3,478,142 4,524,334 11,165,599 15,103,845
Selling, general and administrative 1,636,438 1,733,229 5,336,105 5,912,220
Wind-down expenses 154,742 68,694 199,799 258,749
Total operating expenses 5,269,322 6,326,257 16,701,503 21,274,814
Loss from operations (5,077,218) (6,163,172) (15,752,765) (20,763,054)
Other income (expense):        
Change in fair value of warrant liability (11,239,465) 1,697,194 (9,974,685) 6,500,377
Realized gain on sale of marketable securities       83,750
Interest income 2,372 3,514 9,393 11,332
Interest expense (11,392) (16,585) (40,014) (56,585)
Other income (expense), net (11,087) 144,697 25,364 107,400
Total other income (expense), net (11,259,572) 1,828,820 (9,979,942) 6,646,274
Net loss $ (16,336,790) $ (4,334,352) $ (25,732,707) $ (14,116,780)
Basic and diluted net loss per share $ (0.54) $ (0.31) $ (0.99) $ (1.02)
Weighted average number of common shares outstanding, basic and diluted 30,168,475 14,009,341 25,992,764 13,831,749