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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Consolidated Statements of Operations    
Net sales $ 156,426 $ 133,714
Cost of sales 90,413 78,800
Gross profit 66,013 54,914
Operating expenses, net:    
Research and development 24,117 21,844
Selling, general, and administrative 22,894 20,255
Amortization of intangible assets 2,504 3,354
Other operating expense (income), net (19) 46
Total operating expenses, net 49,496 45,499
Operating income 16,517 9,415
Interest income 89 136
Interest expense (2,892) (6,759)
Income before income taxes 13,714 2,792
Income tax expense (benefit) 384 298
Net income $ 13,330 $ 2,494
Income per common share:    
Basic (in dollars per share) $ 0.27 $ 0.05
Diluted (in dollars per share) $ 0.24 $ 0.05
Weighted average number of shares:    
Basic (in shares) 49,614 48,624
Diluted (in shares) 65,285 53,050