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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 164 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Costs and expenses      
General and administrative expenses $ 7,423 $ 4,166 $ 68,571
Research and development costs 7,131 3,648 88,894
Total costs and expenses 14,554 7,814 157,465
Operating loss (14,554) (7,814) (157,465)
Change In Fair Value Of Warrant Liability Expense Income (338) 5,966 (5,471)
Interest income 3 0 2,880
Other expense and interest expense 0 0 (274)
Net loss (14,889) (1,848) (160,330)
Common share data:      
Basic and diluted loss per share (in dollars per share) $ (0.31) $ (0.04)  
Weighted average number of basic and diluted common shares outstanding (in shares) 48,341,670 42,953,553  
Comprehensive loss $ (14,889) $ (1,856) $ (160,376)