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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Net sales $ 126,249 $ 95,342 $ 330,726 $ 307,657
Cost and expenses:        
Cost of sales (1) [1] 70,985 50,685 186,036 166,829
Research and development 22,454 20,324 68,794 64,002
Selling, general and administrative 31,768 30,297 91,645 97,497
Amortization of purchased intangible assets 10,249 9,791 30,182 29,334
Restructuring charges 509 14 8,347 36
Costs and Expenses 135,965 111,111 385,004 357,698
Loss from operations (9,716) (15,769) (54,278) (50,041)
Other (expense) income:        
Interest expense (110) (86) (434) (519)
Interest income 1,335 2,609 4,334 7,651
Foreign transaction loss (111) (1,579) (551) (2,493)
Pension curtailment gain 787 0 2,317 0
Loss on extinguishment of debt 0 0 0 (241)
Loss before taxes (7,815) (14,825) (48,612) (45,643)
Income tax provision (benefit) (3,714) 3,231 3,173 2,817
Net loss $ (4,101) $ (18,056) $ (51,785) $ (48,460)
Loss per share:        
Basic (in dollars per share) $ (0.09) $ (0.39) $ (1.11) $ (1.03)
Diluted (in dollars per share) $ (0.09) $ (0.39) $ (1.11) $ (1.03)
Weighted average shares used in computing loss per share:        
Basic (in shares) 46,748 46,815 46,685 46,971
Diluted (in shares) 46,748 46,815 46,685 46,971
[1] Excludes amortization of purchased intangibles of $7,873 and $7,518 for the three months ended September 27, 2025, and September 28, 2024, respectively, and $23,171 and $22,526 for the nine months ended September 27, 2025, and September 28, 2024, respectively.