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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Consolidated Statements of Operations        
Net sales $ 161,641 $ 163,999 $ 315,145 $ 320,425
Cost of sales 94,131 99,732 185,618 190,146
Gross profit 67,510 64,267 129,527 130,279
Operating expenses, net:        
Research and development 27,384 26,016 54,945 50,133
Selling, general, and administrative 23,822 22,950 46,449 45,844
Amortization of intangible assets 2,123 2,505 4,235 5,009
Other operating expense (income), net 493 (27) 404 (47)
Total operating expenses, net 53,822 51,444 106,033 100,939
Operating income 13,688 12,823 23,494 29,340
Interest income 2,420 213 4,494 302
Interest expense (3,052) (2,848) (5,928) (5,740)
Other income (expense), net (97,091)   (97,091)  
Income (loss) before income taxes (84,035) 10,188 (75,031) 23,902
Income tax expense (benefit) 1,285 533 1,548 917
Net income (loss) $ (85,320) $ 9,655 $ (76,579) $ 22,985
Income (loss) per common share:        
Basic (in dollars per share) $ (1.61) $ 0.19 $ (1.48) $ 0.46
Diluted (in dollars per share) $ (1.61) $ 0.18 $ (1.48) $ 0.43
Weighted average number of shares:        
Basic (in shares) 52,861 49,697 51,764 49,702
Diluted (in shares) 52,861 59,455 51,764 59,521