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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues    
Type of Revenue [Extensible List] us-gaap:ProductMember us-gaap:ProductMember
Total revenues $ 62,959 $ 48,868
Operating expenses    
Type of Cost, Good or Service [Extensible List] us-gaap:ProductMember us-gaap:ProductMember
Cost of product sales $ 2,950 $ 2,153
License fees and royalties 1,630 1,332
Research and development 52,923 39,276
Selling, general and administrative 93,090 60,926
Total operating expenses 150,593 103,687
Loss from operations (87,634) (54,819)
Interest income, net 2,934 1,170
Other expense (229)  
Loss before income taxes (84,929) (53,649)
Income tax expense 375 647
Net loss $ (85,304) $ (54,296)
Net loss per common share, basic and diluted $ (0.59) $ (0.44)
Weighted average common shares outstanding, basic and diluted 143,981 124,727