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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Product revenue, net $ 47,051 $ 32,441 $ 126,343 $ 90,563
Licensing revenue 309 293 895 825
Total revenue, net 47,360 32,734 127,238 91,388
Less: Cost of goods sold 11,921 8,451 31,520 24,208
Gross margin 35,439 24,283 95,718 67,180
Operating expenses:        
Selling, general and administrative 33,194 26,061 98,910 80,147
Research and development 10,694 13,490 35,211 39,798
Total operating expenses 43,888 39,551 134,121 119,945
Operating loss (8,449) (15,268) (38,403) (52,765)
Gain on change in fair value of derivative liabilities   3,610   8,170
Interest expense, net (2,401) (5,051) (7,097) (16,253)
Other income (expense), net 25 (78) 100 (381)
Loss from operations before taxes (10,825) (16,787) (45,400) (61,229)
Benefit from income taxes   1,015   2,332
Net loss $ (10,825) $ (15,772) $ (45,400) $ (58,897)
Loss per share:        
Basic $ (0.04) $ (0.08) $ (0.17) $ (0.31)
Diluted $ (0.04) $ (0.08) $ (0.17) $ (0.31)
Weighted average shares:        
Basic 270,803 209,149 270,566 192,618
Diluted 270,803 209,149 270,566 192,618