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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Total revenue, net $ 55,323 $ 47,360 $ 151,884 $ 127,238
Less: Cost of goods sold 13,541 11,921 37,035 31,520
Gross margin 41,782 35,439 114,849 95,718
Operating expenses:        
Selling, general and administrative 49,960 33,194 147,310 98,910
Research and development 14,072 10,694 43,993 35,211
Total operating expenses 64,032 43,888 191,303 134,121
Operating loss (22,250) (8,449) (76,454) (38,403)
Interest expense, net (2,163) (2,401) (6,188) (7,097)
Other (expense) income, net (58) 25 (134) 100
Loss from operations before taxes (24,471) (10,825) (82,776) (45,400)
Net loss $ (24,471) $ (10,825) $ (82,776) $ (45,400)
Loss per share:        
Basic $ (0.08) $ (0.04) $ (0.28) $ (0.17)
Diluted $ (0.08) $ (0.04) $ (0.28) $ (0.17)
Weighted average shares:        
Basic 295,595 270,803 291,526 270,566
Diluted 295,595 270,803 291,526 270,566
Product Revenue, Net        
Total revenue, net $ 54,973 $ 47,051 $ 151,286 $ 126,343
Licensing Revenue        
Total revenue, net $ 350 $ 309 $ 598 $ 895