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Segment Information - Schedule of Financial Performance through Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 28, 2025 | Sep. 29, 2024 | Sep. 28, 2025 | Sep. 29, 2024 | Dec. 29, 2024 | Dec. 31, 2023
Schedule of Financial Performance through Reportable Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 70,005 | [1] | $ 5,536 | [1] | $ 220,269 | [1] | $ 20,068 | [1] | $ 108,742 |  | $ 87,616 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues |  | 37,965 |  | 8,693 |  | 126,970 |  | 21,834 |  | 69,240 |  | 69,828 |
Sales commissions |  | 7,534 |  | 7,270 |  | 24,273 |  | 11,691 |  | 24,590 |  | 31,127 |
Sales and marketing |  |  |  |  |  |  |  | 3,762 |  |  |  |  |
General and administrative | [2] |  |  |  |  |  |  | 29,789 |  |  |  |  |
Operating (loss) income from continuing operations |  | (3,444) |  | (29,970) |  | (5,120) |  | (47,008) |  | (68,509) |  | (52,358) |
Reconciliation of segment (loss) income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  | (8,230) |  |  |  |  |
Interest income |  |  |  | 86 |  | 3 |  | 102 |  | 19 |  | 36 |
Other expense, net |  | (4,256) | [3] | (65,684) | [3] | (1,724) | [3] | (66,234) | [3] | 7,932 | [4] | (29,862) | [4]
Gain on extinguishment of debt |  |  |  | 19,948 |  |  |  | 19,948 |  |  |  |  |
(Loss) from continuing operations before income taxes |  | (15,804) |  | (77,958) |  | (30,099) |  | (101,422) |  | (54,444) |  | (96,217) |
Residential Solar Installation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Financial Performance through Reportable Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 67,460 |  | 87,616 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Sales commissions |  |  |  |  |  |  |  |  |  | 23,388 |  | 31,127 |
Sales and marketing |  |  |  |  |  |  |  |  |  | 6,827 |  | 6,920 |
Operating (loss) income from continuing operations |  |  |  |  |  |  |  |  |  | (17,826) |  | (52,358) |
Reconciliation of segment (loss) income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |
New Homes Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Financial Performance through Reportable Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 41,282 |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Sales commissions |  |  |  |  |  |  |  |  |  | 1,202 |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |
Operating (loss) income from continuing operations |  |  |  |  |  |  |  |  |  | 12,874 |  |  |
Reconciliation of segment (loss) income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Financial Performance through Reportable Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | 70,005 |  | 5,536 |  | 220,269 |  |  |  |  |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues |  | 37,965 |  | 8,693 |  | 126,970 |  |  |  |  |  |  |
Sales commissions |  | 7,534 |  | 7,270 |  | 24,273 |  |  |  |  |  |  |
Sales and marketing |  | 6,467 |  | 1,093 |  | 21,764 |  |  |  |  |  |  |
General and administrative |  | 21,483 | [5] | 18,450 | [5] | 52,382 | [2] |  |  |  |  |  |
Operating (loss) income from continuing operations |  | (3,444) |  | (29,970) |  | (5,120) |  |  |  |  |  |  |
Reconciliation of segment (loss) income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | (8,104) |  | (2,338) |  | (23,258) |  |  |  |  |  |  |
Interest income |  |  |  | 86 |  | 3 |  |  |  |  |  |  |
Other expense, net |  | (4,256) |  | (65,684) |  | (1,724) |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  | 19,948 |  |  |  |  |  |  |  |  |
(Loss) from continuing operations before income taxes |  | (15,804) |  | (77,958) |  | (30,099) |  |  |  |  |  |  |
Reportable Segment [Member] | Residential Solar Installation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Financial Performance through Reportable Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | 38,579 |  | 5,536 |  | 114,097 |  | 20,068 |  |  |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues |  | 20,984 |  | 8,693 |  | 67,388 |  | 21,834 |  |  |  |  |
Sales commissions |  | 7,479 |  | 7,270 |  | 22,882 |  | 11,691 |  |  |  |  |
Sales and marketing |  | 4,781 |  | 1,093 |  | 19,591 |  | 3,762 |  |  |  |  |
General and administrative |  | 12,240 | [5] | 18,450 | [5] | 32,782 | [2] | 29,789 | [2] |  |  |  |
Operating (loss) income from continuing operations |  | (6,905) |  | (29,970) |  | (28,546) |  | (47,008) |  |  |  |  |
Reconciliation of segment (loss) income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |
Reportable Segment [Member] | New Homes Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Financial Performance through Reportable Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | 27,116 |  |  |  | 101,862 |  |  |  |  |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues |  | 13,329 |  |  |  | 55,930 |  |  |  |  |  |  |
Sales commissions |  | 55 |  |  |  | 1,391 |  |  |  |  |  |  |
Sales and marketing |  | 1,686 |  |  |  | 2,173 |  |  |  |  |  |  |
General and administrative |  | 9,243 | [5] |  | [5] | 19,600 | [2] |  | [2] |  |  |  |
Operating (loss) income from continuing operations |  | 2,803 |  |  |  | 22,768 |  |  |  |  |  |  |
Reconciliation of segment (loss) income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |
Reportable Segment [Member] | Sunder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Financial Performance through Reportable Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | 4,310 |  |  |  | 4,310 |  |  |  |  |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues |  | 3,652 |  |  |  | 3,652 |  |  |  |  |  |  |
Sales commissions |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative |  |  | [5] |  | [5] |  | [2] |  | [2] |  |  |  |
Operating (loss) income from continuing operations |  | 658 |  |  |  | 658 |  |  |  |  |  |  |
Reconciliation of segment (loss) income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Revenue is net of dealer fees attributable to related party of $0.3 million and $1.6 million in the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Revenue is net of dealer fees attributable to related party of $1.6 million in each of the thirteen and thirty-nine week periods ended September 29, 2024. Refer to Note 16 – Related Party Transactions for details.
[2] | In the thirty-nine weeks ended September 28, 2025, depreciation and amortization expense was $3.4 million, $0.9 million and zero for the Residential Solar Installation, New Homes Business and Sunder reportable segments, respectively. In the thirty-nine weeks ended September 29, 2024, depreciation and amortization expense was $1.0 million for the Residential Solar Installation reportable segment.
[3] | Includes the following related party transactions (in millions):
[4] | Includes related party interest expense and amortization of debt issuance costs of $1.8 million and $1.5 million in the thirteen week periods ended September 28, 2025, and September 29, 2024, respectively. Includes related party interest expense and amortization of debt issuance costs of $5.4 million and $5.6 million in the thirty-nine weeks periods ended September 28, 2025, and September 29, 2024, respectively.
[5] | For the thirteen weeks ended September 28, 2025, depreciation and amortization expense was $1.0 million, $0.3 million, and zero for the Residential Solar Installation, New Homes Business and Sunder reportable segments, respectively. For the thirteen weeks ended September 29, 2024, depreciation and amortization expense was $0.3 million for the Residential Solar Installation reportable segment.

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