Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Sponsorship Commitment In February 2021, the Company agreed to a sponsorship agreement with several entities related to the UBS Arena, Belmont Park and the NY Islanders Hockey Club. Pursuant to that agreement, the Company was designated an “Official Electric Transportation Partner of UBS Arena” with various associated marketing and branding rights, including the development of electric vehicle charging stations. The sponsorship agreement had a term of three years with a sponsor fee of approximately $0.5 million per year, of which approximately $0.3 million and $0.2 million were paid in June 2021 and January 2022, respectively. One of the Company’s directors is a co-owner of the NY Islanders Hockey Club. During the second quarter of 2022, the Company exercised its option to terminate the final two years of the agreement and incurred no further sponsor fees. Legal Proceedings The Company is periodically involved in legal proceedings and claims arising in the normal course of business, including proceedings relating to intellectual property, employment and other matters. Management believes the outcome of these proceedings will not have a significant adverse effect on the Company’s financial position, operating results, or cash flows. Securities Class Action Proceedings On March 8, 2021, two putative securities class action complaints were filed against the Company, and certain of its current and former officers and directors in the federal district court for the Southern District of New York. Those cases were ultimately consolidated under C.A. No. 1:21-cv-2002, and a lead plaintiff was appointed in June 2021. On July 20, 2021, an amended complaint was filed alleging that certain public statements made by the defendants between October 2, 2020, and March 2, 2021, violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder. Following negotiations with a mediator, in September 2023, the Company and the plaintiffs agreed on a settlement in principle in the aggregate amount of $19.5 million (the “Settlement Amount”), and on December 6, 2023, the lead plaintiff and the defendants entered into a stipulation and agreement of settlement requiring the Company to pay the Settlement Amount to resolve the class action litigation and the related legal fees and administration costs. Furthermore, on January 18, 2024, the court preliminarily approved the proposed settlement as being fair, reasonable, and adequate, and scheduled a hearing for April 30, 2024, to, among other things, consider whether to approve the proposed settlement. The Company expects the Settlement Amount to be offset by approximately $4.5 million of related loss recoveries from the Company’s directors and officers liability insurance policies with third parties, which the amount is included in prepaid expenses and other current assets on the consolidated balance sheet as of December 31, 2023. The Company accrued for the $19.5 million Settlement Amount as of December 31, 2023 (See Note 7. Accrued Expenses and Other Current Liabilities) and paid the $15.0 million net settlement amount to the settlement claims administrator in February 2024. On September 20, 2021, and October 19, 2021, two class action complaints were filed in the Delaware Court of Chancery against certain of the Company’s current officers and directors, and the Company’s sponsor of its special purpose acquisition company merger, Pivotal Investment Holdings II LLC. These actions were consolidated as in re XL Fleet Corp. (Pivotal) Stockholder Litigation, C.A. No. 2021-0808, and an amended complaint was filed on January 31, 2022. The amended complaint alleges various breaches of fiduciary duty against the Company and/or its officers, several allegedly misleading statements made in connection with the merger, and aiding and abetting breaches of fiduciary duty in connection with the negotiation and approval of the December 21, 2020 merger and organization of Legacy XL to become XL Fleet Corp. The Company believes the allegations asserted in both class action complaints are without merit and is vigorously defending the lawsuit. At this time, the Company is unable to estimate potential losses, if any, related to the lawsuit. Shareholder Derivative Actions On June 23, 2022, the Company received a shareholder derivative complaint filed in the U.S. District Court for the District of Massachusetts, captioned Val Kay derivatively on behalf of nominal defendant XL Fleet Corp., against all current directors and former officers and directors, C.A. No. 1:22-cv-10977. The action was filed by a shareholder purportedly on XL Fleet Corp.’s behalf, and raises claims for contribution, as well as claims for breach of fiduciary duty, waste of corporate assets, unjust enrichment, and abuse of control. On December 8, 2023, the parties submitted a joint status report advising the court that they had reached a settlement-in-principle to settle this action, the Reali v. Griffin, et al. action, the Tucci v. Ledecky, et al. action, and a stockholder litigation demand (collectively, the “Derivative Matters”). Plaintiffs filed a motion for preliminary approval of the settlement on March 1, 2024, which is pending a decision from the court. The settlement provides for certain corporate governance enhancements and no monetary payments. Plaintiffs also intend to submit a petition for attorneys’ fees, which defendants intend on opposing. At this time, the Company is unable to estimate potential losses, if any, related to the potential fee petition. In March 2023, two shareholder derivative actions were filed in the U.S. District Court for the District of Delaware (the “Delaware Derivative Actions”). One action is captioned Reali v. Griffin, et al., C.A. No. 1:23-cv-00289 and the other action is captioned Tucci v. Ledecky, et al., C.A. 1:23-cv-00322. These actions were consolidated and captioned In re Spruce Power Holding Corporation Shareholder Derivative Litigation, C.A. No. 1:23-cv-00289. As noted above, the consolidated action is part of a settlement agreement that has been filed in the U.S. District Court for the District of Massachusetts. In August 2023, an additional derivative action was filed in the U.S. District Court for the Southern District of New York, captioned Boyce v. Ledecky, et al., C.A. No. 1:23-cv-8591. On March 11, 2024, all defendants filed motions to dismiss the complaint in its entirety, which are pending before the court. The settlement agreement for the Derivative Matters described above contains a release that would apply to claims in this action if the settlement agreement is approved by the U.S. District Court for the District of Massachusetts. On March 22, 2024, Boyce agreed to voluntarily dismiss the lawsuit. Securities and Exchange Commission Civil Enforcement Action On January 6, 2022, the Company received a subpoena from the Division of Enforcement of the SEC requesting, among other things, information and documents concerning the XL Fleet Corp. business combination with Legacy XL, the Company’s sales pipeline and revenue projections, California Air Resources Board approvals, and other related matters. In June 2023, the SEC proposed an Offer of Settlement for the purpose of resolving the proposed SEC action against the Company. Following negotiations with the SEC staff, in September 2023, the Company reached a settlement with the SEC pursuant to which the Company did not admit or deny the SEC’s allegations regarding the above-referenced issues. In connection with the settlement, in October 2023, the Company (among other things) paid a civil monetary penalty of $11.0 million which, subject to the discretion of the SEC, will be made available to eligible legacy shareholders through a Fair Fund, termed and administered by the SEC. US Bank On February 9, 2023, US Bank, through its affiliate, Firstar Development, LLC (“Firstar”), filed a motion for summary judgment in lieu of a complaint in New York Supreme Court (the trial level in New York) alleging that the Company failed to fulfill its reimbursement obligations under a 2019 tax recapture guaranty agreement between the parties arising from the alleged recapture by the Internal Revenue Service of tax credits taken by Firstar as an investor in the Company’s subsidiary, Ampere Solar Owner I, LLC. On May 23, 2023, the Company reached a settlement agreement with Firstar, as the plaintiff, for $2.3 million whereby the plaintiff discharged all claims filed against the Company. BMZ USA, Inc. On February 11, 2022, BMZ USA Inc. (“BMZ”), a battery manufacturer, sued Legacy XL for breach of contract, alleging that Legacy XL failed to timely purchase the full allotment of batteries required under a certain master supply agreement between the parties. In January 2024, BMZ obtained a judgment for $3.9 million against XL Hybrids, Inc. The Company is appealing the ruling while simultaneously pursuing a settlement. The Company currently estimates the potential loss to be approximately $1.2 million, which has been accrued for as of December 31, 2023 (See Note 7. Accrued Expenses and Other Current Liabilities). Plastic Omnium Plastic Omnium is the assignee of the contractual rights of Actia Corp. under a certain battery purchase order between Legacy XL and Actia Corp. On March 17, 2023, Plastic Omnium sued Legacy XL and the Company for breach of contract, alleging that Legacy XL ordered a total of 1,000 batteries from Plastic Omnium, paid for 455 of those batteries, and then reneged on 545 of those products. While Plastic Omnium admits it never actually delivered the remaining 545 products, it claims it purchased materials to complete the order, and as a result, Legacy XL and the Company are liable for at least approximately $2.5 million. The Company believes the allegations asserted in this action lack substantial merit, and as a result, is vigorously defending the lawsuit. At this time, the Company is unable to estimate potential losses, if any, related to the lawsuit. Master SREC Purchase and Sale Agreement The Company has forward sales agreements, which are related to a certain number of SRECs, to be generated from the Company’s solar energy systems located in Maryland, Massachusetts, Delaware, and New Jersey to be sold at fixed prices over varying terms of up to 20 years. In the event the Company does not deliver such SRECs to the counterparty, the Company could be forced to pay additional penalties and fees as stipulated within the contracts. Guarantees In connection with the acquisition of RPV Holdco 1, LLC, a wholly owned subsidiary of the Company, guaranty agreements were established in May 2020 by and between Spruce Holding Company 1, LLC, Spruce Holding Company 2, LLC, and Spruce Holding Company 3, LLC (“Spruce Guarantors”) and the investor members in certain of the Funds and Prior Funds. The Spruce Guarantors entered into guarantees in favor of the tax equity investors wherein they guaranteed the payment and performance of Solar Service Experts, LLC, a wholly owned subsidiary of the Company, under the Spruce Power 2 Maintenance Services Agreement and the Class B Member under the Limited Liability Company Agreement (“LLCA”). These guaranties are subject to a maximum of the aggregate amount of capital contributions made by the Class A Member under the LLCA. Indemnities and Guarantees During the normal course of business, the Company has made certain indemnities and guarantees under which it may be required to make payments in relation to certain transactions. The duration of the Company’s indemnities and guarantees varies, however the majority of these indemnities and guarantees are limited in duration. Historically, the Company has not been obligated to make significant payments for such obligations, does not anticipate future payments, and as such, no liabilities have been recorded for these indemnities and guarantees as of December 31, 2023 and 2022. ITC Recapture Provisions The IRS may disallow and recapture some, or all, of the ITCs due to improperly calculated basis after a project has been placed in service (“Recapture Event”). If a Recapture Event occurs, the Company is obligated to pay the applicable Class A Member a recapture adjustment, which includes the amounts the Class A Members are required to repay the IRS, including interest and penalties, as well as any third-party legal and accounting fees incurred by the Class A Members in connection with the Recapture Event, as specified in the operating agreements. Such a payment by the Company to the Class A Members is not to be considered a capital contribution to the fund per the operating agreements, nor would it be considered a distribution to the Class A Members. With the exception of the tax matter related to Ampere Solar Owner I, LLC noted above, a Recapture Event was not deemed probable by the Company, therefore no related accrual has been recorded as of December 31, 2023 and 2022. Insurance Claims and Recoveries related to Maui Fires In August 2023, a series of wildfires broke out in Hawaii, predominantly on the island of Maui, resulting in real and personal property and natural resource damage, personal injuries and loss of life and widespread power outages. The Company is currently assessing the impact of these wildfires on its home solar systems and customer contracts in the area; however, the Company has not been able to validate the extent of the related damage due to limited access to the area. Based on the Company’s current assessment, the Company wrote off approximately $0.1 million during the year ended December 31, 2023, which is reflected within gain (loss) on asset disposal in the consolidated statements of operations. No material loss claims have been reported to date or recognized within the consolidated financial statements as of December 31, 2023. In addition, the Company has not recorded any related insurance recoveries as of December 31, 2023. The Company does not expect this event to have a material impact on its financial position, operating results or cash flows.