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Consolidated Condensed Statements of Operations and Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended 278 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Consolidated Condensed Statements of Operations and Comprehensive Income (Unaudited) [Abstract]          
General and administrative expenses $ 5,238,072 $ 3,702,123 $ 9,404,086 $ 6,248,295 $ 49,269,168
Research and development costs 5,247,896 4,603,110 8,896,120 7,544,219 65,486,284
Total costs and expenses 10,485,968 8,305,233 18,300,206 13,792,514 114,755,452
Operating loss (10,485,968) (8,305,233) (18,300,206) (13,792,514) (114,755,452)
Change in fair value of warrant liability, net 5,026,634 (634,694) 10,992,291 (8,053,023) (9,706,311)
Interest income 106 2,610 665 3,875 2,871,944
Other income 0 0 0 0 (102,753)
Interest expense 0 0 0 0 (171,473)
Net loss (5,459,228) (7,667,929) (7,307,250) (21,841,662) (121,864,045)
Other comprehensive income (loss) (3,000) (9,000) (11,000) (1,000) (37,200)
Total comprehensive loss $ (5,462,228) $ (7,676,929) $ (7,318,250) $ (21,842,662) $ (121,901,245)
Basic and diluted loss per share $ (0.13) $ (0.21) $ (0.17) $ (0.60)  
Weighted average number of shares of common stock outstanding, basic and diluted 42,988,240 37,090,559 42,971,148 36,676,944