Quarterly report [Sections 13 or 15(d)]

Summary of Business and Significant Accounting Policies - Condensed Consolidated Statement of Cash Flows (Details)

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Summary of Business and Significant Accounting Policies - Condensed Consolidated Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2025
Jun. 29, 2025
Mar. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 28, 2025
Sep. 30, 2024
Dec. 31, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items]                  
Net loss $ (77,497) $ (10,332) $ 622 $ (9,469) $ (7,505) $ (2,430) $ (87,207) $ (19,404)  
Deferred taxes             59,728 (8,779)  
Operating lease liabilities and right-of-use assets             $ 1,784 6,402  
Previously Reported                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                  
Net loss       (9,055)       (18,577)  
Deferred taxes               (8,376)  
Operating lease liabilities and right-of-use assets               5,172  
Adjustment                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                  
Net loss       $ (414)       (827) $ 1,300
Deferred taxes               (403)  
Operating lease liabilities and right-of-use assets               $ 1,230