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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue:        
Revenue $ 178,216 $ 94,060 $ 484,013 $ 257,612
Costs and operating expenses:        
Cost of product revenue 75,495 39,626 197,232 108,471
Research and development 9,154 4,422 25,155 13,460
Selling, general and administrative 48,373 29,051 131,809 83,277
Total costs and operating expenses 133,022 73,099 354,196 205,208
Income from operations 45,194 20,961 129,817 52,404
Other income (expenses):        
Investment income 44 82 137 1,699
Interest expense (3,220) (3,052) (9,470) (9,032)
Other expenses (786) (248) (1,789) (632)
Other expenses, net (3,962) (3,218) (11,122) (7,965)
Income before income taxes 41,232 17,743 118,695 44,439
Income tax provision 7,734 3,191 19,514 4,211
Net income $ 33,498 $ 14,552 $ 99,181 $ 40,228
Earnings per share:        
Basic $ 0.61 $ 0.28 $ 1.81 $ 0.77
Diluted $ 0.58 $ 0.27 $ 1.74 $ 0.75
Weighted average common shares outstanding:        
Basic 55,015 52,545 54,918 52,341
Diluted 57,368 53,469 57,072 53,300
Net income $ 33,498 $ 14,552 $ 99,181 $ 40,228
Other comprehensive income (loss):        
Foreign currency translation adjustment (5,550) 4,390 (12,004) 5,304
Comprehensive income 27,948 18,942 87,177 45,532
Products        
Revenue:        
Revenue 178,177 94,029 483,834 257,521
Royalty and other revenue        
Revenue:        
Revenue $ 39 $ 31 $ 179 $ 91