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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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