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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 28, 2024
Sep. 30, 2023
Net sales $ 95,342 $ 150,804 $ 307,657 $ 499,096
Cost and expenses:        
Cost of sales (1) [1] 50,685 79,909 166,829 261,638
Research and development 20,324 21,478 64,002 66,454
Selling, general and administrative 30,297 32,416 97,497 99,403
Amortization of purchased intangible assets 9,791 8,857 29,334 26,617
Restructuring charges 14 742 36 2,046
Costs and Expenses 111,111 143,402 357,698 456,158
Income (loss) from operations (15,769) 7,402 (50,041) 42,938
Other (expense) income:        
Interest expense (86) (773) (519) (2,628)
Interest income 2,609 3,207 7,651 8,657
Foreign transaction loss (1,579) (1,200) (2,493) (2,285)
Loss on extinguishment of debt 0 0 (241) (369)
Income (loss) before taxes (14,825) 8,636 (45,643) 46,313
Income tax provision 3,231 4,721 2,817 16,129
Net income (loss) $ (18,056) $ 3,915 $ (48,460) $ 30,184
Basic (in dollars per share) $ (0.39) $ 0.08 $ (1.03) $ 0.64
Diluted (in dollars per share) $ (0.39) $ 0.08 $ (1.03) $ 0.63
Weighted average shares used in computing income (loss) per share:        
Basic (in shares) 46,815 47,615 46,971 47,525
Diluted (in shares) 46,815 48,107 46,971 48,102
[1] Excludes amortization of $7,518 and $6,948 for the three months ended September 28, 2024 and September 30, 2023, respectively, and $22,526 and $20,941 for the nine months ended September 28, 2024 and September 30, 2023, respectively.