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Summary of Significant Accounting Policies (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2025 | Dec. 29, 2024
Summary of Significant Accounting Policies [Abstract] |  |
Schedule of Reconciles Cash, Cash Equivalents, and Restricted Cash | The Company reconciles cash, cash equivalents, and restricted cash reported in its unaudited condensed consolidated balance sheets that aggregate to the beginning and ending balances shown in the Company’s unaudited condensed consolidated statements of cash flows as follows (in thousands):
|  | As of |
|  | September 28, 2025 |  |  | December 29, 2024 |
Cash and cash equivalents |  | $ | 5,072 |  |  | $ | 13,378 |
Restricted cash |  |  | 3,841 |  |  |  | 3,841 |
Total cash, cash equivalents and restricted cash |  | $ | 8,913 |  |  | $ | 17,219 |
| The Company reconciles cash, cash equivalents, and restricted cash reported in its consolidated balance sheets that aggregate to the beginning and ending balances shown in the Company’s consolidated statements of cash flows as follows (in thousands):
|  | As of |
|  | December 29, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Cash and cash equivalents |  | $ | 13,378 |  |  | $ | 2,593 |
Restricted cash |  |  | 3,841 |  |  |  | 3,823 |
Total cash, cash equivalents, and restricted cash |  | $ | 17,219 |  |  | $ | 6,416 |
Schedule of Allowance for Credit Losses | The following table summarizes the allowance for credit loss activity as of and for the periods ended (in thousands):
|  | Thirty-Nine Weeks Ended |
|  | September 28, |  |  | September 29, |
|  | 2025 |  |  | 2024 |
Balance at beginning of year |  | $ | (1,701 | ) |  | $ | (9,846 | )
Provision charged to earnings |  |  | (4,159 | ) |  |  | (4,204 | )
Amounts written off, net of recoveries and other adjustments |  |  | 1,048 |  |  |  | 1,041 |
Balance at end of period |  | $ | (4,812 | ) |  | $ | (13,009 | )
| The following table summarizes the allowance for credit losses as follows (in thousands):
|  | As of |
|  | December 29, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Balance at beginning of period |  | $ | (9,846 | ) |  | $ | (4,812 | )
Provision charged to earnings |  |  | (9,132 | ) |  |  | (5,083 | )
Amounts written off, net of recoveries and other adjustments |  |  | 17,277 |  |  |  | 49 |
Balance at end of period |  | $ | (1,701 | ) |  | $ | (9,846 | )
Schedule of Contract Assets and Contract Liabilities Balances | Total contract liabilities balances as of the respective dates are as follows (in thousands):
|  | As of |
|  | September 28, |  |  | December 29, |
|  | 2025 |  |  | 2024 |
Contract liabilities current and noncurrent |  |  | (11,426 | ) |  |  | (10,921 | )
| Total contract assets and contract liabilities balances as of the respective dates are as follows (in thousands):
|  | As of |
|  | December 29, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Contract assets |  | $ | 26,066 |  |  | $ | - |
Contract liabilities current and noncurrent |  |  | 10,921 |  |  |  | 3,478 |
Schedule of Revenue Recognized | Refer to the table below for the Company’s revenue recognized (in thousands):
|  | Thirteen Weeks Ended |  |  | Thirty-Nine Weeks Ended |
|  | September 28, 2025 |  |  | September 29, 2024 |  |  | September 28, 2025 |  |  | September 29, 2024 |
Residential Solar Installation |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized over time |  | $ | 38,579 |  |  | $ | 5,536 |  |  | $ | 114,097 |  |  | $ | 20,068 |
Total Residential Solar Installation |  |  | 38,579 |  |  |  | 5,536 |  |  |  | 114,097 |  |  |  | 20,068 |
New Homes Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized over time |  |  | 9,443 |  |  |  | — |  |  |  | 40,075 |  |  |  | — |
Revenue recognized at a point in time |  |  | 17,673 |  |  |  | — |  |  |  | 61,787 |  |  |  | — |
Total New Homes Business |  |  | 27,116 |  |  |  | — |  |  |  | 101,862 |  |  |  | — |
Sunder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized at a point in time |  |  | 4,310 |  |  |  | — |  |  |  | 4,310 |  |  |  | — |
Total Sunder |  |  | 4,310 |  |  |  | — |  |  |  | 4,310 |  |  |  | — |
Total revenue |  | $ | 70,005 |  |  | $ | 5,536 |  |  | $ | 220,269 |  |  | $ | 20,068 |
Total revenue recognized over time |  | $ | 48,022 |  |  | $ | 5,536 |  |  | $ | 154,172 |  |  | $ | 20,068 |
Total revenue recognized at a point in time |  |  | 21,983 |  |  |  | — |  |  |  | 66,097 |  |  |  | — |
| Refer to the table below for the Company’s revenue recognized (in thousands):
|  | Fiscal Year Ended |
|  | December 29, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Residential Solar Installations |  |  |  |  |  |
Revenue recognized over time |  | $ | 67,460 |  |  | $ | 84,858 |
Revenue recognized at a point in time |  |  | - |  |  |  | 2,758 |
Total Residential Solar Installations |  |  | 67,460 |  |  |  | 87,616 |
New Homes Business |  |  |  |  |  |  |  |
Revenue recognized over time |  |  | 32,205 |  |  |  | - |
Revenue recognized at a point in time |  |  | 9,077 |  |  |  | - |
Total New Homes Business |  |  | 41,282 |  |  |  | - |
Total revenue |  | $ | 108,742 |  |  | $ | 87,616 |
Schedule of Components of Prepaid Expenses and Other Current Assets | The following table summarizes the components of prepaid expenses and other current assets:
|  | As of |
|  | September 28, |  |  | December 29, |
|  | 2025 |  |  | 2024 |
Deferred costs |  | $ | 20,737 |  |  | $ | 3,759 |
Other |  |  | 93 |  |  |  | 4,447 |
Total prepaid expenses and other current assets |  | $ | 20,830 |  |  | $ | 8,206 |
Schedule of Estimated Useful Lives of the Assets |  | Depreciation and amortization are calculated using the straight-line method over the following estimated useful lives of the assets:
|  | Useful Lives
Manufacturing equipment |  | 1 - 3 years
Internal-use software |  | 3 - 5 years
Furniture & equipment |  | 3 - 5 years
Leasehold improvements |  | Shorter of 3 to 5 years of the asset or the term of the lease.
Schedule of Intangible Assets of Estimated Useful Life |  | All intangible assets that have been determined to have definite lives are amortized over their estimated useful life as indicated below:
|  | Useful Lives
Trademarks |  | 10 years
Developed technology |  | 3 years

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