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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Consolidated Statements of Operations    
Net sales $ 133,714 $ 104,502
Cost of sales 78,800 58,083
Gross profit 54,914 46,419
Operating expenses, net:    
Research and development 21,844 19,195
Selling, general, and administrative 20,255 18,304
Amortization of intangible assets 3,354 3,837
Restructuring   625
Other operating expense (income), net 46 (109)
Total operating expenses, net 45,499 41,852
Operating income (loss) 9,415 4,567
Interest income 136 800
Interest expense (6,759) (5,666)
Income (loss) before income taxes 2,792 (299)
Income tax expense (benefit) 298 268
Net income (loss) $ 2,494 $ (567)
Income (loss) per common share:    
Basic (in dollars per share) $ 0.05 $ (0.01)
Diluted (in dollars per share) $ 0.05 $ (0.01)
Weighted average number of shares:    
Basic (in shares) 48,624 47,811
Diluted (in shares) 53,050 47,811