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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Product revenues $ 2,341  
Operating Expenses:    
Cost of goods sold 1,287  
Selling, general and administrative 39,267 14,027
Research and development 21,838 4,756
Total operating expenses 62,392 18,783
Operating loss (60,051) (18,783)
Gain (loss) on change in fair value of derivative liabilities 3,620 (66,209)
Interest expense, net (8,860) (3,951)
Other (expense) income, net (124) 68
Loss from operations before taxes (65,415) (88,875)
Benefit from income taxes 3,257 590
Net loss $ (62,158) $ (88,285)
Loss per share:    
Basic and diluted $ (0.41) $ (0.65)
Weighted average shares:    
Basic and diluted 150,430 136,011