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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. 31, 2024
 [4]
Dec. 29, 2024
Dec. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]              
Operating revenues $ 70,005 [1] $ 5,536 [1] $ 220,269 [1] $ 20,068 [1]   $ 108,742 $ 87,616
Less:              
Cost of revenues           30,609
Sales commissions 7,534 7,270 24,273 11,691   24,590 31,127
Sales and marketing       3,762      
General and administrative 21,483 18,450 52,382 29,789   76,594 32,099
Operating income (loss) (3,444) (29,970) (5,120) (47,008)   (68,509) (52,358)
Reconciliation of segment loss from continuing operations before income taxes:              
Interest expense       8,230      
Interest income 86 3 102   19 36
Other income (expense), net (4,256) [2] (65,684) [2] (1,724) [2] (66,234) [2]   7,932 [3] (29,862) [3]
Gain on troubled debt restructuring 19,800   19,800   $ 22,337 22,337 [2] [2],[4]
Loss from continuing operations before taxes $ (15,804) $ (77,958) $ (30,099) $ (101,422)   (54,444) (96,217)
Residential Solar Installation [Member]              
Segment Reporting, Revenue Reconciling Item [Line Items]              
Operating revenues           67,460 87,616
Less:              
Cost of revenues           45,266 69,828
Sales commissions           23,388 31,127
Sales and marketing           6,827 6,920
General and administrative           9,805 [5] 32,099 [6]
Operating income (loss)           (17,826) (52,358)
Reconciliation of segment loss from continuing operations before income taxes:              
General corporate expense          
Interest expense          
Interest income          
Other income (expense), net          
Gain on troubled debt restructuring          
Loss from continuing operations before taxes          
New Homes Business [Member]              
Segment Reporting, Revenue Reconciling Item [Line Items]              
Operating revenues           41,282
Less:              
Cost of revenues           23,974
Sales commissions           1,202
Sales and marketing          
General and administrative           3,232 [5] [6]
Operating income (loss)           12,874
Reconciliation of segment loss from continuing operations before income taxes:              
General corporate expense          
Interest expense          
Interest income          
Other income (expense), net          
Gain on troubled debt restructuring          
Loss from continuing operations before taxes          
Reportable Segments [Member]              
Segment Reporting, Revenue Reconciling Item [Line Items]              
Operating revenues           108,742 87,616
Less:              
Cost of revenues           69,240 69,828
Sales commissions           24,590 31,127
Sales and marketing           6,827 6,920
General and administrative           13,037 [5] 32,099 [6]
Operating income (loss)           (4,952) (52,358)
Reconciliation of segment loss from continuing operations before income taxes:              
General corporate expense           (63,557)
Interest expense           (16,223) (14,033)
Interest income           19 36
Other income (expense), net           7,932 (29,862)
Gain on troubled debt restructuring           22,337
Loss from continuing operations before taxes           $ (54,444) $ (96,217)
[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] Includes the following related party transactions (in millions):
[3] 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.
[4] Gain includes $12.5 million with a related party in the fiscal year ended December 29, 2024. Refer to Note 15 - Borrowings and Derivative Liabilities for details.
[5] For the year ended December 29, 2024, depreciation and amortization expense was $2.6 million and $0.1 million for the Residential Solar Installation and New Homes Business reportable segments, respectively.
[6] For the year ended December 31, 2023, depreciation and amortization expense was $0.9 million for the Residential Solar Installation reportable segment.