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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Product revenues $ 12,606 $ 5,500 $ 23,573 $ 7,842
Less: Cost of goods sold 5,025 2,844 9,271 4,131
Gross margin 7,581 2,656 14,302 3,711
Operating expenses:        
Selling, general and administrative 21,094 33,961 41,679 73,228
Research and development 11,727 17,489 23,434 39,327
Total operating expenses 32,821 51,450 65,113 112,555
Operating loss (25,240) (48,794) (50,811) (108,844)
Gain on change in fair value of derivative liabilities 3,011 18,841 7,404 22,461
Gain on extinguishment of debt 38,034   38,034  
Interest expense, net (4,296) (9,345) (8,689) (18,205)
Other income (expense), net 4,225 (411) 4,241 (536)
Income (Loss) from operations before taxes 15,734 (39,709) (9,821) (105,124)
(Provision for) benefit from income taxes (411) (65) (836) 3,192
Net income (loss) $ 15,323 $ (39,774) $ (10,657) $ (101,932)
Earnings (loss) per share:        
Basic $ 0.09 $ (0.26) $ (0.06) $ (0.68)
Diluted $ 0.08 $ (0.34) $ (0.07) $ (0.77)
Weighted average shares:        
Basic 172,886 150,694 172,879 150,562
Diluted 207,674 157,043 173,876 157,067