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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Product revenue, net $ 17,707 $ 12,606 $ 33,265 $ 23,573
Licensing revenue     375  
Total revenue, net 17,707 12,606 33,640 23,573
Less: Cost of goods sold 6,381 5,025 12,008 9,271
Gross margin 11,326 7,581 21,632 14,302
Operating expenses:        
Selling, general and administrative 26,054 21,094 50,795 41,679
Research and development 12,009 11,727 24,623 23,434
Total operating expenses 38,063 32,821 75,418 65,113
Operating loss (26,737) (25,240) (53,786) (50,811)
(Loss) gain on change in fair value of derivative liabilities (600) 3,011 (136) 7,404
Gain on extinguishment of debt   38,034   38,034
Interest expense, net (4,807) (4,296) (9,692) (8,689)
Other income (expense), net 95 4,225 (33) 4,241
(Loss) income from operations before taxes (32,049) 15,734 (63,647) (9,821)
Benefit from (provision for) income taxes 537 (411) 1,009 (836)
Net (loss) income (31,512) 15,323 (62,638) (10,657)
Preferred stock purchase option     (868)  
Preferred stock beneficial conversion feature (31,341)   (31,341)  
Net (loss) income applicable to common shareholders $ (62,853) $ 15,323 $ (94,847) $ (10,657)
(Loss) earnings per share:        
Basic $ (0.35) $ 0.09 $ (0.53) $ (0.06)
Diluted $ (0.35) $ 0.08 $ (0.53) $ (0.07)
Weighted average shares:        
Basic 180,464 172,886 178,036 172,879
Diluted 180,464 207,674 178,036 173,876