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Basic and Diluted Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Dec. 31, 2024
Dec. 29, 2024
Dec. 31, 2023
Numerator for basic loss per share:              
Net loss from continuing operations $ (15,804) $ (77,958) $ (30,099) $ (101,433) $ (54,444) $ (54,444) $ (96,197)
Net loss from discontinued operations           (2,007) (25,853)
Impairment loss from discontinued operations           (147,505)
Net loss $ (16,904) $ (77,958) $ (31,199) $ (103,440)   (56,451) (269,555)
Numerator for diluted loss per share              
Impact of 7% Notes derivative liability and interest expense, net of tax           (35,886)
Net loss           $ (92,337) $ (269,555)
Weighted average shares:              
Denominator for basic loss per share 84,904,228 75,348,627 82,036,790 61,868,747   66,655,837 24,723,370
7% Notes derivative liability           9,137,711
Denominator for diluted loss per share 84,904,228 75,348,627 82,036,790 61,868,747   75,793,548 24,723,370
Net loss per share:              
Continuing operations – basic $ (0.19) $ (1.03) $ (0.37) $ (1.64)   $ (0.82) $ (3.89)
Discontinued operations - basic (0.01) (0.01) (0.03)   (0.03) (1.05)
Net loss - basic (0.2) (1.03) (0.38) (1.67)   (0.85) (4.94)
Continuing operations – diluted (0.19) (1.03) (0.37) (1.64)   (1.19) (3.89)
Discontinued operations – diluted (0.01) (0.01) (0.03)   (0.03) (1.05)
Net loss – diluted $ (0.2) $ (1.03) $ (0.38) $ (1.67)   $ (1.22) $ (4.94)