| Summary of Significant Accounting Policies (Policies) | 12 Months Ended |
| Dec. 31, 2022 |
| Accounting Policies [Abstract] | |
| Basis of consolidated financial statement presentation | Basis of consolidated financial statement presentation: The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). The accompanying Consolidated Financial Statements of the Company include the accounts of its wholly owned subsidiaries and variable interest entities, for which the Company was the primary beneficiary. All significant intercompany transactions have been eliminated in consolidation. |
| Use of estimates | Use of estimates: The preparation of financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the balance sheet date, as well as reported amounts of expenses during the reporting period. The Company’s most significant estimates and judgments involve inventory reserves, deferred income taxes, warranty reserves, valuation of share-based compensation, the valuation of warrant liability, useful lives of certain assets and liabilities, the |
| Variable interest entities | Variable interest entities: The Company consolidates any variable interest entity ("VIE") of which it is the primary beneficiary. The Company formed or acquired VIEs which are partially funded by tax equity investors in order to facilitate the funding and monetization of certain attributes associated with solar energy systems. The typical condition for a controlling financial interest ownership is holding a majority of the voting interests of an entity; however, a controlling financial interest may also exist in entities, such as VIEs, through arrangements that do not involve controlling voting interests. A variable interest holder is required to consolidate a VIE if that party has the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company does not consolidate a VIE in which it has a majority ownership interest when the Company is not considered the primary beneficiary. The Company evaluates its relationships with the VIEs on an ongoing basis to determine if it is the primary beneficiary. The Company's investments in Ampere Solar Owner IV, LLC, Volta Solar Owner II, LLC, ORE F4 HoldCo, LLC, ORE F5A HoldCo, LLC, ORE F6 HoldCo, LLC, Sunserve Residential Solar I, LLC, RPV Fund 11 LLC, RPV Fund 13 LLC, Level Solar Fund III LLC and Level Solar Fund IV LLC (collectively, the "Funds") were determined to be variable interests in VIEs. The Company considered the provisions within the contractual arrangements that grant it power to manage and make decisions that affect the operation of the VIEs, including determining the solar energy systems contributed to the VIEs, and the operation and maintenance of the solar energy systems. The Company considers the rights granted to the other investors under the contractual arrangements to be more protective in nature rather than substantive participating rights. As such, the Company was determined to be the primary beneficiary and the assets, liabilities and activities of the Funds are consolidated by the Company. (See Note 12. Redeemable Noncontrolling Interests and Noncontrolling Interests) |
| Redeemable noncontrolling interest and noncontrolling interests | Redeemable noncontrolling interests and noncontrolling interests: The distribution rights and priorities for the Funds as set forth in their respective operating agreements differ from the underlying percentage ownership interests of the members. As a result, the Company allocates income or loss to the noncontrolling interest holders of the Funds utilizing the hypothetical liquidation of book value ("HLBV") method, in which income or loss is allocated based on the change in each member's claim on the net assets at the end of each reporting period, adjusted for any distributions or contributions made during such periods. The HLBV method is commonly applied to investments where cash distribution percentages vary at different points in time and are not directly linked to an equity member's ownership percentage. The HLBV method is a balance sheet-focused approach. Under this method, a calculation is prepared at each reporting date to determine the amount that each member would receive if the entity were to liquidate all of its assets and distribute the resulting proceeds to its creditors and members based on the contractually defined liquidation priorities. The difference between the calculated liquidation distribution amounts at the beginning and the end of the reporting period, after adjusting for capital contributions and distributions, is used to derive each member's share of the income or loss for the period. Factors used in the HLBV calculation include GAAP income (loss), taxable income (loss), capital contributions, investment tax credits, distributions and the stipulated targeted investor return specified in the subsidiaries' operating agreements. Changes in these factors could have a significant impact on the amounts that investors would receive upon a hypothetical liquidation. |
| Concentration of Credit Risk | Concentration of Credit Risk: Financial instruments which potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents. At times, such cash may be in excess of the FDIC limit. At December 31, 2022 and 2021, the Company had cash in excess of the $250,000 federally insured limit. The Company believes it is not exposed to any significant credit risk on cash and cash equivalents. |
| Cash and cash equivalents | Cash and cash equivalents: The Company considers all highly liquid investments with a maturity of three months or less at the time of purchase to be cash equivalents. Cash and cash equivalents include cash held in banks, U.S. Treasury bills and money market accounts. Cash equivalents are carried at cost, which approximates fair value due to their short-term nature. The Company’s cash and cash equivalents are placed with high-credit quality financial institutions and issuers, and at times exceed federally insured limits. To date, the Company has not experienced any credit loss relating to its cash and cash equivalents. |
| Restricted cash | Restricted cash: Restricted cash held at December 31, 2022 of $19.8 million primarily consists of approximately $19.7 million of cash that is subject to restriction due to provisions in the Company's financing agreements and the operating agreements of the Funds that are accounted for as consolidated VIEs. Restricted cash held at December 31, 2021 of $150,000 consists of a bank deposit required for a letter of credit which is reserved for the Company’s California lease. The restricted cash may be subject to depository and collateral account agreements. The carrying amount reported in the Consolidated Balance Sheets for restricted cash approximates fair value. |
| Accounts receivable, net | Accounts receivable, net: Accounts receivable represent amounts due from customers and are stated at the gross invoice amount, net of an allowance for doubtful accounts. The allowance for doubtful accounts is maintained at a level considered adequate to provide for potential account losses on the balance based on Management’s evaluation of the anticipated impact of current economic conditions, changes in the character and size of the balance, past and expected future loss experience, among other pertinent factors. As of December 31, 2022, the Company’s allowance for doubtful accounts was $12.2 million. |
| Inventory, net | Inventory, net: Inventory is comprised of raw materials, work in process and finished goods related to its discontinued Drivetrain and XL Grid businesses. Inventory is stated at the lower of cost or net realizable value. Cost of raw material inventories include the purchase and related costs incurred in bringing the products to their present location and condition. The Company uses consistent methodologies to evaluate inventory for net realizable value and periodically reviews inventories for obsolescence and any inventories identified as slow moving or obsolete are initially reserved for and then written-off. |
| Fair value measurements | Fair value measurements: The fair value of the Company’s financial assets and liabilities reflects Management’s estimate of amounts that the Company would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three-level hierarchy of measurements based upon observable and unobservable inputs is used to arrive at fair value. Observable inputs are developed based on market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about valuation based on the best information available in the circumstances. Depending on the inputs, the Company classifies each fair value measurement as follows: Level 1 : Observable inputs that reflect unadjusted quoted market prices in active markets for identical assets or liabilities that are accessible at the measurement date. Level 2 : Observable inputs other than Level 1 prices, such as quoted market prices for similar assets or liabilities in active markets, quoted market prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 : Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy must be determined based on the lowest level input that is significant to the fair value measurement. An assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and consideration of factors specific to the asset or liability. The Company’s financial instruments consist of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued liabilities, contingent consideration liability, long-term debt, interest rate swaps and warrant liability. The carrying value of cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses approximates fair value because of the short-term nature of those instruments. See Note 13. Fair Value Measurements for additional information on assets and liabilities measured at fair value. |
| Solar energy systems, net and other property and equipment, net | Solar energy systems, net: Solar energy systems, net consists of residential solar energy systems which are subject to Customer Agreements. Solar energy systems are recorded at fair value upon acquisition, less any impairment charges. For all acquired systems, the Company calculates depreciation using the straight-line method over the remaining useful life as of the acquisition date based on a 30-year useful life from the date the asset was placed in service. When a solar energy system is sold or otherwise disposed of, a gain (or loss) is recognized for the amount of cash received in excess of the net book value of the solar energy system (or vice versa) at which time the related solar energy system is removed from the balance sheet. Other property and equipment, net: Other property and equipment, net is stated at cost less accumulated depreciation, or if acquired in a business combination, at fair value as of the date of acquisition. Depreciation is calculated using the straight-line method, based upon the following estimated useful lives: |
| Asset retirement obligations | Asset retirement obligations: Customer agreements only require that solar energy systems be removed if: (1) the customer has not renewed the customer agreement or exercised their purchase option and (2) the host customer requests the Company to remove the system. Upon review of the Company's estimate of the probability of required system removal, the Company considered current industry trends and has determined that it is highly probable that the customers will choose to renew their agreements or exercise the buyout option as the systems have an estimated useful life greater than the terms of the customer agreements and would still present value to the customer through cost savings. Therefore, the Company believes that the probability-weighted estimated removal costs are nominal. |
| Business combinations | Business combinations: The Company accounts for the acquisition of a business using the acquisition method of accounting. Amounts paid to acquire a business are allocated to the assets acquired and liabilities assumed based on their fair values at the date of acquisition. The Company determines the fair value of purchase consideration, including contingent consideration, and acquired intangible assets based on valuations that use certain information and assumptions provided by Management. The Company allocates any excess purchase price over the fair value of the net tangible and intangible assets acquired to goodwill. The results of operations of acquired businesses are included in the financial statements from the date of acquisition forward. Acquisition-related costs are expensed in periods in which the costs are incurred. |
| Intangible assets, net | Intangible assets, net: Intangible assets are initially recorded at fair value and stated net of accumulated amortization and impairments. The Company amortizes its intangible assets that have finite lives using either the straight-line method, or if reliably determinable, based on the pattern in which the economic benefit of the asset is expected to be utilized. Amortization is recorded over the estimated useful lives. The Company evaluates the recoverability of its definite lived intangible assets whenever events or changes in circumstances or business conditions indicate that the carrying value of these assets may not be recoverable based on expectations of future undiscounted cash flows for each asset group. If the carrying value of an asset or asset group exceeds its undiscounted cash flows, the Company estimates the fair value of the assets, generally utilizing a discounted cash flow analysis based on the present value of estimated future cash flows to be generated by the assets or asset group using a risk-adjusted discount rate. During 2022, intangible assets consisted of: (i) developed technology acquired during 2019, (ii) sponsorship agreement contracted during 2021, and (iii) customer relationships acquired in the World Energy acquisition in 2021. In the fourth quarter of 2022, the Company determined that there were indicators of impairment for intangible assets in its Drivetrain and XL Grid businesses and determined that the assets were not recoverable. Comparing the carrying value of the assets to the fair value it was determined that the entire balance was impaired and impairment charges of $0.9 million were recognized. |
| Impairment of long-lived assets | Impairment of long-lived assets: The Company reviews long-lived assets, including solar energy systems, property and equipment, and intangible assets with definite lives, for impairment whenever events or changes in circumstances indicate that an asset group’s carrying amount may not be recoverable. The Company groups assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities and evaluate the asset group against the sum of the undiscounted future cash flows. If the undiscounted cash flows do not indicate the carrying amount of the asset group is recoverable, an impairment charge is measured as the amount by which the carrying amount of the asset group exceeds its fair value. |
| Impairment of goodwill | Impairment of goodwill: Goodwill represents the excess of cost over the fair market value of net tangible and identifiable intangible assets of acquired businesses. Goodwill is not amortized but instead is annually tested for impairment, or more frequently if events or circumstances indicate that the carrying amount of goodwill may be impaired. The Company has recorded goodwill in connection with its historical business acquisitions. The Company performs its annual goodwill impairment assessment at October 1 each fiscal year, or more frequently if events or circumstances arise which indicate that goodwill may be impaired. An assessment can be performed by first completing a qualitative assessment on the Company’s single reporting unit. The Company can also bypass the qualitative assessment in any period and proceed directly to the quantitative impairment test, and then resume the qualitative assessment in any subsequent period. Qualitative indicators that may trigger the need for annual or interim quantitative impairment testing include, among other things, deterioration in macroeconomic conditions, declining financial performance, deterioration in the operational environment, or an expectation of selling or disposing of a portion of the reporting unit. Additionally, a significant change in business climate, a loss of a significant customer, increased competition, a sustained decrease in share price, or a decrease in estimated fair value below book value may trigger the need for interim impairment testing of goodwill. If the Company believes that, as a result of its qualitative assessment, it is more likely than not that the fair value of the reporting unit is less than its carrying amount, the quantitative impairment test is required. The quantitative test involves comparing the fair value of the reporting unit with its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, an impairment loss is recorded as a reduction to goodwill with a corresponding charge to earnings in the period the goodwill is determined to be impaired. The income tax effect associated with an impairment of tax-deductible goodwill is also considered in the measurement of the goodwill impairment. Any goodwill impairment is limited to the total amount of goodwill. The Company determines the fair value of its reporting unit using the market approach. Under the market approach method, the Company compared its book value to the fair value of its public float, utilizing the fair value of its common stock on the measurement date. |
| Revenue | Revenue: The Company’s revenue has been derived through three business units: (i) the Residential Solar operations primarily generate revenue through the sale to homeowners of power generated by its residential solar energy systems pursuant to long-term agreements; (ii) the Drivetrain operations generated revenue from the sales of hybrid electric powertrain systems; and (iii) the XL Grid operations generated revenues through turnkey energy efficiency, renewable technology, and other energy solutions. At December 31, 2022, the Drivetrain business and XL Grid business are reported in discontinued operations. Residential Solar Revenues Energy generation - Customers purchase electricity under PPAs or SLAs. Revenue is recognized from contracts with customers as performance obligations are satisfied at a transaction price reflecting an amount of consideration based upon an estimated rate of return which is expressed as the solar rate per kilowatt hour or a flat rate per month as defined in the customer contracts. • PPAs - Under ASC 606, Revenue from Contracts with Customers ("ASC 606") , PPA revenue is recognized when generated based upon the amount of electricity delivered as determined by remote monitoring equipment at solar rates specified under the PPAs. • SLAs - The Company has SLAs, which do not meet the definition of a lease under ASC 842, Leases ("ASC 842"), and are accounted for as contracts with customers under ASC 606. Revenue is recognized on a straight-line basis over the contract term as the obligation to provide continuous access to the solar energy system is satisfied. The amount of revenue recognized may not equal customer cash payments because the performance obligation has been satisfied ahead of cash receipt or evenly as continuous access to the solar energy system has been provided. The differences between revenue recognition and cash payments received are reflected in accounts receivable, other assets or deferred revenue, as appropriate. Solar renewable energy credit s - The Company has contracts with third parties to sell Solar Renewable Energy Credits ("SRECs") generated by the solar energy systems for fixed prices. Certain contracts that meet the definition of a derivative may be exempted as normal purchase or normal sales transactions ("NPNS"). NPNS are contracts that provide for the purchase or sale of something other than a financial instrument or derivative instrument that will be delivered in quantities expected to be used or sold over a reasonable period in the normal course of business. The Company's SREC contracts meet these requirements and are designated as NPNS contracts. Such SRECs are exempted from the derivative accounting and reporting requirements, and the Company recognizes revenues in accordance with ASC 606. The Company recognizes revenue for SRECs based on pricing predetermined within the respective contracts at a point of time when the SRECs are transferred. Government incentives - The Company participates in the Residential Solar Investment Program of Connecticut, which offers a performance-based incentive (“PBI”) for certain of its solar energy systems that are associated with the program (“eligible systems”). PBIs are paid to the Company and recognized as revenue quarterly based on actual per-kilowatt-hour production delivered to the eligible systems. For systems up to 20kW, the Company will be paid a predetermined rate based on the eligible system start date. The program lasts for six years from the eligible systems’ start date. PBI revenue is accounted for under ASC 606 and is earned monthly based upon the actual electricity produced by the system. MSA revenue - The Company earns operating and maintenance revenue from third-party residential solar fund customers at pre-determined rates for various operating and maintenance and asset management services as specified in Maintenance Service Agreements ("MSAs") and Operating Service Agreements ("OSAs"). The MSAs and OSAs contain multiple performance obligations, including routine maintenance, nonroutine maintenance, renewable energy certificate management, inventory management, delinquent account collections and customer account management. Pursuant to ASC 606, the Company has elected the "right to invoice" practical expedient and revenue for these performance obligations are recognized as services are rendered based upon the underlying contractual arrangements. Loan servicing - The Company performs loan servicing functions for third parties in return for a servicing fee. The compensation is based on a percentage of the loans outstanding. The Company has elected the "right to invoice" practical expedient and loan servicing support revenues are recognized as services are rendered based upon the underlying contractual arrangements. The following table presents the detail of the Company’s revenues as recorded in the Consolidated Statements of Operations for the year ended December 31, 2022: (Amounts in thousands) 2022 PPA revenue $ 8,756 SLA revenue 11,270 Solar renewable energy credit revenue 1,576 Government incentives 245 MSA revenue 596 Loan servicing 174 Other revenue 577 Total $ 23,194 Drivetrain and XL Grid Revenues As noted above, the Drivetrain and XL Grid business were included in discontinued operations at December 31, 2022. The Drivetrain products were marketed and sold to end-user fleet customers and channel partners in the United States and Canada. The Company’s XL Grid solutions were marketed and sold to municipalities, corporations and other businesses and principally funded through energy incentives provided through public and private utilities. The XL Grid business primarily consists of the operations acquired through the May 2021 World Energy acquisition. Sales of products and services are subject to economic conditions and may fluctuate based on changes in the industry, trade policies, financial markets, and funded energy incentives. For these businesses, revenue was recognized upon transfer of control to the customer, which occurred when the Company had a present right to payment, legal title had passed to the customer, the customer had the significant risks and rewards of ownership, and where acceptance is not a formality, the customer had accepted the product or service. For the Drivetrain products, in general, transfer of control was upon shipment of the equipment as the terms are FOB shipping point or equivalent and the Company had no other promised goods or services in its contracts with customers. In limited instances, the Company provided installation services to end-user fleet customers related to the purchased hybrid electric powertrain equipment. When provided, these installation services were not distinct within the context of the contract due to the fact that the end-use fleet customer was purchasing a completed modification to its vehicles and therefore, the installation services involved significant integration of the hybrid electric powertrain equipment with the customer’s vehicle. As a result, the hybrid electric powertrain equipment and installation services represented a single performance obligation within these contracts with customers. The Company recognized the revenue for the equipment sale and installation service for Drivetrain products at the same time, which was after the installation is complete. The Company has elected to treat shipping and handling activities related to contracts with channel partner customers for Drivetrain products as costs to fulfill the promise to transfer the associated equipment and not as a separate performance obligation. For XL Grid, in general, transfer of control was upon the acceptance and certification of project completion by both the end customer and the utility who was funding the energy incentives, representing a single performance obligation of the Company. Due to the short-term nature of projects (typically two to three weeks), the Company recognized revenues from all XL Grid activities at a point in time, when persuasive evidence of an arrangement existed, delivery had occurred, the price was fixed or determinable and the Company had the right to payment for the transferred asset. Since the Company generally does not have a right to payment until acceptance and receipt of certification of project completion by both the end customer and the utility who is funding the energy incentives, the Company does not recognize revenue until acceptance and certification occurs. The Company also assessed multiple contracts entered into by the same customer in close proximity to determine if the contracts should be combined for revenue recognition purposes. During the duration of a project for XL Grid, all direct material and labor costs and those indirect costs related to the project were capitalized, and customer deposits were treated as liabilities. Once a project had been completed and the energy efficiency upgrades have been deemed to meet client specifications, capitalized costs were charged to earnings. For both Drivetrain and XL Grid, when the Company’s contracts with customers contained multiple performance obligations, which was infrequent, the contract transaction price was allocated on a relative standalone selling price ("SSP") basis to each performance obligation. The Company determined SSP based on observable selling prices for the sale of its systems. For extended warranties, the Company determined SSP based on expected cost plus margin. The Company established the margin based on review of market conditions and margins obtained by market participants for similar services. Any allocation of the transaction price required was determined at the contracts’ inception. The transaction price was the amount of consideration to which the Company expected to be entitled in exchange for transferring goods and services to the customer. Revenue was recorded based on the transaction price, which is solely made up of fixed consideration for its products and services. The Company did not adjust transaction price for the effects of a significant financing component when the period between the transfer of the promised good or service to the customer and payment for that good or service by the customer was expected to be one year or less. For all years presented, the Company did not have any significant financing components as no payment terms exceeded one year from the transfer of control. The Company’s sales could in certain instances include non-cash consideration in the form of the customer transferring to the Company, the customer’s rights to cash incentives from programs administered by municipalities related to hybrid vehicle programs that a customer is entitled to as a result of its purchase. The incentives are fixed amounts that are readily determinable. The Company valued the non-cash consideration at its fair value, which generally is the amount of the incentive. Payment terms on invoices ranged from 30 to 60 days. The Company excluded from revenue any sales tax and other government-assessed and imposed taxes on revenue generating activities that were invoiced to customers. Costs to obtain contracts, which principally related to sales commissions, were recognized at the time the liability was incurred and were not material in fiscal year 2022 or 2021. Remaining performance obligations: At December 31, 2022 and 2021, there was approximately $208,000 and $237,000 in deferred revenue related to unsatisfied extended warranty performance obligations, respectively. During the year ended December 31, 2022, the Company recognized revenue of approximately $29,000 from the December 31, 2021 deferred revenue balance. There was no deferred warranty revenue recognized for the year ended December 31, 2021, respectively. Contract Balances: The timing of revenue recognition, billings and cash collections results in billed trade accounts receivable, and deferred revenue (contract liabilities) on the Consolidated Balance Sheets. Costs to obtain a contract: Sales commissions paid to internal sales personnel, as well as associated payroll taxes and retirement plan contributions (together, sales commissions and associated costs) that are incremental to the acquisition of customer contracts, were expensed upon transfer of control of the equipment at the time the related revenues are recognized. Total commission expense recognized during the years ended December 31, 2022 and 2021 was approximately $837,000 and $834,000, respectively. There were no capitalized commissions during the years ended December 31, 2022 and 2021. Cost of Revenues: Cost of revenues - solar energy systems depreciation represents the depreciation expense relating to the solar energy systems. |
| Warranties | Warranties: Customers who purchased the Company's Drivetrain systems were provided limited-assurance-type warranties for equipment and work performed under the contracts. The warranty period typically extends for 3 years following transfer of control of the equipment. The warranties solely relate to correction of product defects during the warranty period, which is consistent with similar warranties offered by competitors. At the time of purchase of the equipment, customers could purchase from the Company an extended warranty for its equipment. The extended warranty commences upon the end of the assurance-based warranty period and is considered a separate performance obligation that represents a stand-ready obligation to perform warranty services after the assurance-type warranty expires. The transaction price allocated to the extended warranty is recognized ratably over the extended warranty period. Customers of XL Grid were provided limited-assurance-type warranties for a term of one year for installation work performed under its contracts. The Company accrues the estimated cost of product warranties for unclaimed charges based on historical experiences and expected results. Should product failure rates and material usage costs differ from these estimated revisions to the estimated warranty liability are required. The Company periodically assesses the adequacy of its recorded product warranty liabilities and adjusts the balances as required. Warranty expense is recorded as a component of discontinued operations. With the Company’s exit from the Drivetrain business and the subsequent sale of World Energy, the Company will not incur any additional warranty obligations and expects the warranty obligation to substantially run-off over the next 24 months. The following is a roll-forward of the Company’s accrued warranty liability: (Amounts in thousands) 2022 2021 Balance at the beginning of the period $ 2,547 $ 1,735 Acquisition date accrual for World Energy acquisition — 25 Accrual for warranties issued 116 346 Accrual of additional warranty obligations — 965 Changes in estimates for preexisting warranties (955) — Warranty fulfillment charges (583) (524) Balance at the end of the period $ 1,125 $ 2,547 The warranty liability is included in Current Liabilities of Discontinued Operations on the Consolidated Balance Sheets. |
| Income taxes | Income taxes: The Company accounts for income taxes using the asset and liability method under which deferred tax liabilities and assets are recognized for the expected future tax consequences of temporary differences between financial statement carrying amounts and the tax basis of assets and liabilities and net operating loss and tax credit carryforwards. Deferred income taxes are provided for the temporary differences arising between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, and operating loss carry-forwards and credits. Deferred tax assets and liabilities are measured using enacted rates in effect for the year in which the differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of changes in tax rates is recognized in the Statements of Operations in the period in which the enactment rate changes. The ultimate recovery of deferred tax assets is dependent upon the amount and timing of future taxable income and other factors such as the taxing jurisdiction in which the asset is to be recovered. Deferred tax assets and liabilities are reduced through the establishment of a valuation allowance if, based on available evidence, it is more likely than not that the deferred tax assets will not be realized. Uncertain tax positions taken or expected to be taken in a tax return are accounted for using the more likely than not threshold for financial statement recognition and measurement. The determination as to whether the tax benefit will more likely than not be realized is based upon the technical merits of the tax position as well as consideration of the available facts and circumstances. For the years ended December 31, 2022 and 2021, there were no uncertain tax position taken or expected to be taken in the Company’s tax returns. In the normal course of business, the Company is subject to regular audits by U.S. federal and state and local tax authorities. With few exceptions, the Company is no longer subject to federal, state or local tax examinations by tax authorities in its major jurisdictions for tax years before 2019. However, net operating loss carryforwards remain subject to examination to the extent they are carried forward and impact a year that is open to examination by tax authorities. The Company did not recognize any tax related interest or penalties in the accompanying Consolidated Financial Statements, but would record any such interest and penalties as a component of the provision for income taxes. |
| Share-based compensation | Share-based compensation: The Company grants stock-based awards to certain employees, directors and non-employee consultants. Awards issued under the Company’s stock-based compensation plans include stock options, restricted stock units and restricted stock awards. For transactions in which the Company obtains employee services in exchange for an award of equity instruments, the cost of the services are measured based on the grant date fair value of the award. The Company recognizes the cost over the period during which an employee is required to provide services in exchange for the award, known as the requisite service period (usually the vesting period). Costs related to plans with graded vesting are generally recognized using a straight-line method. Stock Options The Company uses the Black-Scholes option pricing model to determine the fair value of stock-based awards and recognizes the compensation cost on a straight line basis over the requisite service period of the awards for employee, which is typically the four-year vesting period of the award, and effective contract period specified in the award agreement for non-employee. The fair value of common stock is determined based on the closing price of the Company’s common stock on the New York Stock Exchange at each award grant date. The determination of the fair value of share-based payment awards utilizing the Black-Scholes model is affected by the stock price and a number of assumptions, including expected volatility, expected life, risk- free interest rate and expected dividends. The Company does not have a significant history of trading of its common stock as it was not a public company until December 21, 2020, and as such expected volatility was estimated using historical volatilities of comparable public entities. The expected life of the awards is estimated based on a simplified method, which uses the average of the vesting term and the original contractual term. The risk-free interest rate assumption is based on observed interest rates appropriate for the expected life of the awards. The dividend yield assumption is based on history and expectation of paying no dividends. Forfeitures are accounted for as they occur. Restricted Stock Units Restricted stock units generally vest over the requisite service periods (vesting on a straight–line basis). The fair value of a restricted stock unit award is equal to the closing price of the Company’s common stock on the New York Stock Exchange on the grant date. The Company accounts for the forfeiture of equity awards as they occur. |
| Derivative instruments and hedging activities | Derivative instruments and hedging activities: The Company utilizes interest rate swaps to manage interest rate risk on existing and planned future debt issuances. The fair value of all derivative instruments are recognized as assets or liabilities at the balance sheet date on the Consolidated Balance Sheets. The fair value of the interest rate swaps are calculated by discounting the future net cash flows to the present value based on the terms and conditions of the agreements and the forward interest rate curves. As these inputs are based on observable data and valuations of similar instruments, the interest rate derivatives are primarily categorized in Level 2 in the fair value hierarchy. |
| Warrant Liabilities | Warrant Liabilities: As of December 31, 2022 and 2021, the Company has outstanding private warrants it assumed with the December 2020 merger of Pivotal and Legacy XL. With the merger, the Company assumed private placement warrants to purchase 4,233,333 shares of common stock, with an exercise price of $11.50 per share. The warrants do not meet the criteria for equity classification and must be recorded as liabilities. As the warrants meet the definition of a derivative, they were measured at fair value at inception and at each reporting date with changes in fair value recognized in the Consolidated Statements of Operations. The Private Warrants were valued using a Black-Scholes model, with significant inputs consisting of risk-free interest rate, remaining term, expected volatility, exercise price, and the Company’s stock price. |
| Segment Reporting | Segment Reporting: Segment reporting is based on the “management approach,” following the method that management organizes the company’s reportable segments for which separate financial information is made available to, and evaluated regularly by, the Company’s chief operating decision maker (“CODM”) in allocating resources and in assessing performance. The Company’s CODM is its Chief Executive Officer. The Company’s CODM does not evaluate operating segments using asset or liability information. With the acquisition of Legacy Spruce Power, the Company had three reportable segments, (i) Residential Solar, (ii) Drivetrain and (iii) XL Grid, and separately calculated the costs of its corporate operations. In the fourth quarter of 2022, the Company determined that the Drivetrain and XL Grid operations were discontinued operations which resulted in the Company having one operating segment. As of December 31, 2022, the Company’s Residential Solar segment owns and |
| Engineering, research and development expense | Engineering, research and development expense: Engineering, research and development costs, which are primarily related to the Company's Drivetrain business, were expensed as incurred and include, but are not limited to, costs incurred in performing research and development activities, including salaries, benefits, facilities, research-related overhead, sponsored research costs, contracted services, license fees, and other external costs. |
| Net income (loss) per share | Net income (loss) per share: Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares of common stock outstanding during the period, without consideration for potentially dilutive securities. Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares of common stock and potentially dilutive securities outstanding during the period determined using the treasury-stock and if-converted methods. For purposes of the diluted income (loss) per share calculation, stock options, restricted stock units, restricted stock and warrants are considered to be potentially dilutive securities. Potentially dilutive securities are excluded from the calculation of diluted income (loss) per share when their effect would be anti-dilutive. |
| Related parties | Related parties: A party is considered to be related to the Company if the party directly or indirectly or through one or more intermediaries, controls, is controlled by, or is under common control with the Company. Related parties also include principal owners of the Company, its Management, members of the immediate families of principal owners of the Company and its management and other parties with which the Company may deal if one party controls or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests. A party which can significantly influence the management or operating policies of the transacting parties or if it has an ownership interest in one of the transacting parties and can significantly influence the other to an extent that one or more of the transacting parties might be prevented from fully pursuing its own separate interests is also a related party. |
| Recent accounting pronouncements issued and adopted | Recent accounting pronouncements issued and adopted: In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments , ("ASU 2016-13”) which, together with subsequent amendments, amends the requirement on the measurement and recognition of expected credit losses for financial assets held to replace the incurred loss model for financial assets measured at amortized cost and require entities to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. ASU 2016-13 is effective for the Company beginning January 1, 2023. The adoption of ASU 2016-13 is not expected to have a material impact on the Company’s Consolidated Financial Statements. |
