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Industry Segment, Geographic Information and Significant Customers - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 145,832 $ 193,435 $ 374,959 $ 509,811
Cost of revenue 100,580 131,058 271,095 383,865
Research and development 13,094 19,630 41,547 76,739
General and administrative 20,346 3,232 60,430 (33,552)
Restructuring and other 81 1,922 7,287 24,298
Amortization of acquired intangible assets 146 1,066 427 1,405
Other expense, net (711) (12,548) (28,391) (24,583)
Income tax expense 3,144 1,080 3,079 1,917
Net loss (21,526) (6,371) (131,607) (68,410)
Reportable Segment        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 145,832 193,435 374,959 509,811
Cost of revenue 100,580 131,058 271,095 383,865
Research and development 13,094 19,630 41,547 76,739
Working marketing 10,594 9,292 36,623 33,715
Other selling and marketing 18,662 19,978 57,687 65,251
General and administrative 20,346 3,232 60,430 (33,552)
Restructuring and other 81 1,922 7,287 24,298
Amortization of acquired intangible assets 146 1,066 427 1,405
Other expense, net 711 12,548 28,391 24,583
Income tax expense 3,144 1,080 3,079 1,917
Net loss $ (21,526) $ (6,371) $ (131,607) $ (68,410)