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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Selected quarterly data                      
Revenue $ 114,373 $ 182,784 $ 81,003 $ 57,000 $ 143,032 $ 51,331 $ 0 $ 2,279,874 $ 435,160 $ 2,474,237 $ 1,258,054
Research and development 6,701,465 11,500,053 11,116,323 14,864,420 11,904,935 9,716,091 8,657,606 9,426,870 44,182,260 39,705,502 13,680,573
General and administration 1,723,562 1,675,268 1,989,103 1,593,557 1,367,491 1,534,417 1,540,200 1,498,252 6,981,490 5,940,360 5,373,945
Licensing expense 0 50,000 0 0 0 0 0 268,750 50,000 268,750 299,616
Operating loss (8,340,710) (13,028,207) (13,064,942) (16,442,921) (13,168,413) (11,240,177) (10,240,352) (8,959,419)      
Net loss $ (6,648,906) $ (12,733,691) $ (14,975,231) $ (17,250,676) $ (13,271,735) $ (11,589,711) $ (10,794,351) $ (10,540,419) $ (51,608,504) $ (46,196,216) $ (47,527,768)
Loss per share:                      
Basic and diluted (in dollars per share) $ (0.36) $ (0.72) $ (0.96) $ (1.20) $ (1.08) $ (0.96) $ (1.02) $ (1.14)