Summary of Significant Accounting Policies [Abstract]

(b) Cash and 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

(d) Cash and Cash Equivalents

The Company considers all highly liquid securities that mature within three months or less from the original date of purchase to be cash equivalents. The Company maintains the majority of its cash balances with commercial banks in interest bearing accounts. Cash and cash equivalents include cash held in checking and savings accounts and money market accounts consisting of highly liquid securities with maturity dates of three months or less from the original date of purchase. As of December 29, 2024 and December 31, 2023, the Company had cash balances of $13.4 million and $2.6 million, respectively, in excess of federally insured limits.

Contract Assets and Contract Liabilities

(d) Contract liabilities

Contract liabilities consist of deferred revenue and customer advances, which represent consideration received from a customer prior to transferring control of goods or services to the customer under the terms of a sales contract. 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	)

The Company typically invoices its customers upon completion of set milestones, generally upon installation of the solar energy system with the remaining balance invoiced upon passing final building inspection. Standard payment terms to customers range from 30 to 60 days. When the Company receives payment, or when such payment is unconditionally due from a customer prior to delivering goods or services to the customer under the terms of a customer agreement, the Company records this deferred revenue as a contract liability. Most installation projects are completed within 12-months. As such, a significant portion of the Company’s contract liabilities is reflected within current liabilities in the accompanying condensed consolidated balance sheets. Contract liabilities for installation projects expected to be completed beyond 12 months are classified as noncurrent obligations in the accompanying condensed consolidated balance sheets.

(g) Contract Assets and Contract Liabilities

Contract assets consist of unbilled receivables which represent revenue that has been recognized in advance of billing the customer. Contract liabilities consist of deferred revenue and customer advances, which represent consideration received from a customer prior to transferring control of goods or services to the customer under the terms of a sales contract. 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

During the fiscal year ended December 29, 2024, the increase in contract assets of $26.1 million was primarily driven by an increase in residential project sales that have met revenue recognition based on applicable milestones but have not been billed. The increase in contract assets and contract liabilities is primarily attributed to the SunPower Acquisition in fiscal year 2024.

The Company typically invoices its customers upon completion of set milestones, generally upon installation of the solar energy system with the remaining balance invoiced upon passing final building inspection. Standard payment terms to customers range from 30 to 60 days. When the Company receives payment, or when such payment is unconditionally due from a customer prior to delivering goods or services to the customer under the terms of a customer agreement, the Company records this deferred revenue as a contract liability. As installation projects are typically completed within 12-months, the Company’s contract liability is reflected within current liabilities in the accompanying consolidated balance sheets. The amount of revenue recognized during the years ended December 29, 2024, and December 31, 2023, that was included in contract liabilities at the beginning of each period was $3.5 million and $2.1 million, respectively.

Prepaid expenses and other current assets

(f) 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

Changes in related parties

(h) Changes in related parties

Transactions with CRSEF Solis Holdings, LLC and its affiliates (“Carlyle”), have been disclosed as related party transactions until it ceased being a significant shareholder in the Company. Beginning in the thirteen week period ended June 29, 2025, transactions with Carlyle are no longer deemed related party transactions. The Company continues to engage in transactions Carlyle as it is a creditor of the Company’s 12.0% senior unsecured convertible notes. Refer to Note 9 – Borrowings and Derivative Liabilities for additional information.

Polar Multi-Strategy Master Fund (“Polar”) ceased to be a related party, and as a result, beginning in the thirteen week period ended June 29, 2025, transactions with Polar are no longer deemed related party transactions. Transactions previously reported with Polar have been disclosed as related party transactions. The Company continues to have a forward purchase agreement obligation with Polar.

Concentration of Risks

(c) Concentration of Risks

The Company is exposed to credit losses in the event of nonperformance by the counterparties to its financial and derivative instruments. Financial and derivative instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents, restricted cash and cash equivalents, accounts receivable, contract receivables and forward purchase agreement assets. The Company’s cash and cash equivalents are on deposit with major financial institutions. Such deposits may be in excess of insured limits. The Company believes that the financial institutions that hold the Company’s cash are financially sound, and accordingly, minimum credit risk exists with respect to these balances. The Company has not experienced any losses due to institutional failure or bankruptcy. The Company performs credit evaluations of its customers and generally does not require collateral for sales on credit. As of December 29, 2024, no customer had an outstanding balance that represented more than 10% of the total accounts receivable balance. As of December 31, 2023, two customers had an outstanding balance that represented 38% and 16% of the total accounts receivable balance.

Concentration of Customers

The Company defines major customers as those customers who generate revenues that exceed 10% of the Company’s annual net revenues. For the fiscal years ended December 29, 2024 and December 31, 2023, three customers and one customer represented 36% and 55% of gross revenues, respectively, all from the Residential Solar Installation reportable segment.

Concentration of Suppliers

For the fiscal year ended December 29, 2024, the Company expanded its preferred supplier list, as such there was no concentration of suppliers. For the fiscal year ended December 31, 2023, one supplier represented 40% of the Company’s inventory purchases.

Inventories

(h) Inventories

Inventories consist of solar panels and the components of solar energy systems all of which is classified as finished goods within current assets at December 29, 2024 and December 31, 2023. Inventory is valued using the average cost method. The Company identifies inventory which is considered obsolete or in excess of anticipated demand based on a consideration of marketability and product life cycle stage, component cost trends, demand forecasts, historical revenues, and assumptions about future demand and market conditions, and such inventory has been adjusted to its lower of cost or net realizable value.

Internal-Use Software

(k) Internal-Use Software

The Company capitalizes costs to develop its internal-use software when preliminary development efforts are successfully completed, management has authorized and committed project funding, it is probable that the project will be completed, and the software will be utilized as intended. These costs include personnel and related employee benefits and expenses for employees who are directly associated with and who devote time to software projects, and external direct costs of materials and services consumed in developing or obtaining software. Costs incurred prior to meeting these criteria, together with costs incurred for training and maintenance, are expensed as incurred. Costs incurred for enhancements that are expected to provide additional material functionality are capitalized and amortized over the estimated useful life of the related upgrade. During the fiscal years ended December 29, 2024 and December 31, 2023, the Company capitalized $1.2 million and $1.9 million, respectively, of internal-use software development costs. The remaining unamortized balance as of December 29, 2024 and December 31, 2023, of $0.2 million and $3.8 million, respectively, is included in property and equipment, net within the accompanying consolidated balance sheets.

Advertising and Promotional Expenses

(m) Advertising and Promotional Expenses

Advertising and promotional costs are expensed as incurred and included in sales and marketing expense in the accompanying consolidated statements of operations and comprehensive loss. Advertising costs were not material for the fiscal years ended December 29, 2024 and December 31, 2023.

Goodwill

(o) Goodwill

The Company tests goodwill at the reporting unit level for impairment annually on the first day of the fourth quarter, or more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of the reporting unit below its carrying amount.

The Company may elect to perform a qualitative assessment that considers economic, industry and company-specific factors. If, after completing the assessment, it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying value, the Company proceeds to a quantitative test. Quantitative testing requires a comparison of the fair value of each reporting unit to its carrying value. If the carrying value of the reporting unit exceeds its fair value, goodwill impairment is measured as the amount by which the reporting unit’s carrying value exceeds its fair value, not to exceed the carrying value of goodwill.

Impairment of Long-Lived Assets

(q) Impairment of Long-Lived Assets

Long-lived assets, such as property and equipment, ROU assets, and intangible assets subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group to be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying value. If the carrying value of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying value exceeds its fair value. Fair value is determined through various valuation techniques including discounted cash flow models, and quoted market values, as considered necessary.

The Company recognized an impairment loss in the fiscal year ended December 29, 2024 as disclosed in Note 9 - Property and equipment, net. There were no impairment charges recorded in continuing operations for the fiscal year ended December 31, 2023.

Stock-Based Compensation

(s) Stock-Based Compensation

The Company recognizes stock-based compensation expense over the requisite service period on a straight- line basis for all stock-based payments that are expected to vest to employees, non-employees and directors, including grants of employee stock options and other stock-based awards. Equity-classified awards issued to employees, non-employees such as consultants and non-employee directors are measured at the grant-date fair value of the award. Forfeitures are recognized as they occur. For accounting purposes, the Company estimates grant-date fair value of stock options using the Black-Scholes option pricing model. The Black-Scholes option pricing model requires the input of highly subjective assumptions, including the fair value of the underlying common stock as of the grant date, the expected term of the option, the expected volatility of the price of the Company’s common stock and expected dividend yield.

Net Loss Per Share

(u) Net Loss Per Share

The Company computes net loss per share following ASC 260, Earnings Per Share. Basic net loss per share is measured as the loss attributable to common stockholders divided by the weighted average common shares outstanding during periods with undistributed losses. Diluted net loss per share of common stock is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method and if-converted method, as applicable. Securities that potentially have an anti-dilutive effect (i.e., those that increase income per share or decrease loss per share) are excluded from the diluted loss per share calculation.

Warrant Liabilities

(w) Warrant Liabilities

The Company accounts for its warrant liabilities in accordance with the guidance in ASC 815-40, Derivatives and Hedging - Contracts in Entity’s Own Equity, under which the warrants that do not meet the criteria for equity classification and must be recorded as liabilities. The warrant liabilities are measured at fair value at inception and at each reporting date in accordance with the guidance in ASC 820, Fair Value Measurement, with any subsequent changes in fair value recognized in Other income (expense), net on the consolidated statements of operations and comprehensive loss. Refer to Note 5 - Fair Value Measurements and Note 14 - Warrants.

Recently Adopted Accounting Pronouncements

(y) Recently Adopted Accounting Pronouncements

In November 2023, the FASB issued ASU No. 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” (“ASU 2023-07”). The ASU expands public entities’ segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the CODM and included within each reported measure of segment profit or loss, an amount and description of its composition for other segment items, and interim disclosures of a reportable segment’s profit or loss and assets. This guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and requires retrospective adoption. The Company adopted ASU 2023-07 in its fourth quarter of 2024 using a retrospective transition method. See Note 22 - Segment Information - for the Company’s disclosures reflecting the adoption.