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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues    
Product revenues, net $ 87,721 $ 76,511
Cost of product revenues    
Cost of product revenues (excluding intangible asset amortization) 15,328 27,229
Intangible asset amortization 16,795 10,295
Total cost of products revenues 32,123 37,524
Gross profit 55,598 38,987
Operating expenses    
Research and development 2,930 2,666
Selling, general and administrative 31,476 31,260
Total operating expenses 34,406 33,926
Income from operations 21,192 5,061
Interest expense (5,721) (4,823)
Interest income 3 212
Income before income taxes 15,474 450
Benefit from income taxes (188)  
Net income $ 15,662 $ 450
Earnings per share - basic (in dollars per share) $ 0.45 $ 0.01
Weighted-average shares - basic (in shares) 34,951,740 34,100,688
Earnings per share - diluted (in dollars per share) $ 0.41 $ 0.01
Weighted-average shares - diluted (in shares) 41,160,092 35,069,693