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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 28, 2025 | Dec. 29, 2024 | Dec. 31, 2023
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Schedule of Accrued Expenses and Other Current Liabilities [Abstract] |  |  |  |  |  |
Accrued compensation and benefits |  | $ 5,983 |  | $ 6,619 |  |
Professional fees |  | 3,819 |  | 8,028 |  |
Installation costs |  | 15,097 |  | 6,177 |  |
Accrued legal settlements |  | 9,153 |  | 7,700 |  |
Accrued taxes |  | 769 |  | 769 |  |
Accrued rebates and credits |  | 5,769 |  | 7,641 |  |
Operating lease liabilities, current |  | 1,689 |  | 1,412 |  |
Finance lease liabilities, current |  | 1,924 |  | 2,053 |  |
Accrued warranty, current |  | 1,229 |  | 2,531 |  |
Accrued interest | [1] | 3,640 |  | 4,523 |  |
Deferred consideration |  | 5,700 |  |  |  |
Other accrued liabilities |  | 4,499 |  | 8,628 |  |
Total accrued expenses and other current liabilities |  | $ 59,271 | [2] | $ 56,081 | [2] | $ 27,870
[1] | Includes related party accrued interest of $1.2 million and $2.2 million as of September 28, 2025 and December 29, 2024, respectively.
[2] | Includes accrued interest due to related parties of $1.2 million and $2.2 million as of September 28, 2025, and December 29, 2024, respectively.

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