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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Product revenues $ 10,967 $ 2,341
Less: Cost of goods sold 4,246 1,287
Gross margin 6,721 1,054
Operating expenses:    
Selling, general and administrative 20,585 39,267
Research and development 11,707 21,838
Total operating expenses 32,292 61,105
Operating loss (25,571) (60,051)
Gain on change in fair value of derivative liabilities 4,393 3,620
Interest expense, net (4,393) (8,860)
Other income (expense), net 16 (124)
Loss from operations before taxes (25,555) (65,415)
(Provision for) benefit from income taxes (425) 3,257
Net loss $ (25,980) $ (62,158)
Loss per share:    
Basic $ (0.15) $ (0.41)
Diluted $ (0.15) $ (0.43)
Weighted average shares:    
Basic 172,872 150,430
Diluted 174,431 157,073