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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues            
Operating Expenses:        
Research and development 20,913 6,013 39,735 15,651
Marketing, general and administrative 13,397 3,433 41,059 16,185
Total operating expenses 34,310 9,446 80,794 31,836
Operating loss (34,310) (9,446) (80,794) (31,836)
Gain (loss) on change in fair value of derivative liability 16,454 106,614 (68,686) (53,403)
Interest (expense) income, net (4,570) 3 (12,838) 97
Other (expense) income, net (427) (59) (411) 30
(Loss) income from operations before taxes (22,853) 97,112 (162,729) (85,112)
Provision for income taxes (3,573) (767) (5,888) (2,352)
Net (loss) income $ (26,426) $ 96,345 $ (168,617) $ (87,464)
(Loss) income per share:        
Basic $ (0.18) $ 0.72 $ (1.19) $ (0.68)
Diluted $ (0.18) $ 0.62 $ (1.19) $ (0.68)
Weighted average shares:        
Basic 149,200 133,238 141,947 128,377
Diluted 149,200 155,975 141,947 128,377