Description of Business	12 Months Ended
Description of Business	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Xos, Inc. and its wholly owned subsidiaries (collectively, the “Company” or “Xos”) is a mobility solutions company manufacturing Class 5 to 8 battery-electric commercial vehicles and facilitating fleet operations both with fleet owners’ transition from traditional internal combustion engine vehicles to electric vehicles and their continued fleet operations, including assisting fleet owners with their transition from traditional internal combustion engine vehicles to electric vehicles through our subscription package that provides fleet owners with services for services such as vehicle maintenance and financing for a fixed monthly fee. Xos developed the X-Platform (its proprietary, purpose-built vehicle chassis platform) and the X-Pack (its proprietary battery system) specifically for the medium- and heavy-duty commercial vehicle segment with a focus on last-mile commercial fleet operations. Xos’ “Fleet-as-a-Service” package offers customers a comprehensive suite of commercial products and services to facilitate electric fleet operations and seamlessly transition their traditional combustion-engine fleets to battery-electric vehicles. Business Combination Xos, Inc. was initially incorporated on July 29, 2020 as a Cayman Islands exempted company under the name “NextGen Acquisition Corporation” (“NextGen”). On August 20, 2021, the transactions contemplated by the Agreement and Plan of Merger, as amended on May 14, 2021, by and among NextGen, Sky Merger Sub I, Inc., a Delaware corporation and a direct wholly owned subsidiary of NextGen (“Merger Sub”), and Xos, Inc., a Delaware corporation (now known as Xos Fleet, Inc., “Legacy Xos”), were consummated (the “Closing”), whereby Merger Sub merged with and into Legacy Xos, the separate corporate existence of Merger Sub ceased and Legacy Xos became the surviving corporation and a wholly owned subsidiary of NextGen (such transaction the “Merger” and, collectively with the Domestication, the “Business Combination”). As a result, Xos became the publicly traded entity listed on the Nasdaq Global Market. Emerging Growth Company Section 102(b)(1) of the Jumpstart Our Business Startups Act (“JOBS Act”) exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a registration statement declared effective pursuant to the Securities Act of 1933, as amended (the “Securities Act”), or do not have a class of securities registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard, until such time the Company is no longer considered to be an emerging growth company. At times, the Company may elect to early adopt a new or revised standard. Risks and Uncertainties COVID-19 and actions taken to mitigate its spread have had and are expected to continue to have an adverse impact on the economies and financial markets of many countries, including the areas in which the Company operates. As the COVID-19 pandemic continues to evolve, the Company believes the extent of the impact to its business, operating results, cash flows, liquidity and financial condition will be primarily driven by the severity and duration of the COVID-19 pandemic, the pandemic’s impact on the United States and global economies and the timing, scope and effectiveness of federal, state and local governmental responses to the pandemic. Those primary drivers are beyond the Company’s knowledge and control, and as a result, at this time the Company is unable to predict the cumulative impact, both in terms of severity and duration, that the COVID-19 pandemic will have on its business, operating results, cash flows and financial condition. However, the impact of the COVID-19 pandemic could be material if the current circumstances continue to exist for a prolonged period of time or worsen. Additionally, recent geopolitical events, such as the recent military conflict between Russia and Ukraine, may increase the severity of supply chain disruptions and further hinder our ability to source inventory for our vehicles. The conflict continues to evolve and its ultimate impact on the Company is uncertain, but a prolonged conflict may have a material negative impact on the Company’s business, operating results, cash flows, liquidity and financial condition. Although the Company has used the best current information available to it in its estimates, actual results could materially differ from the estimates and assumptions developed by management. Supply Chain Disruptions Negative global economic conditions, which the COVID-19 pandemic has contributed to, has impacted the Company’s ability to source certain critical inventory items. The series of restrictions imposed and the speed and nature of the recovery in response to the pandemic have placed burdens on the Company’s supply chain management, such as the semiconductor chip and battery cell shortage and supply limitations on vehicle bodies and aluminum. Despite supply chain disruptions, the Company has continued to source inventory for its vehicles and its purchasing team has been working with vendors to find alternative solutions to areas where there are supply chain constraints, and where appropriate and critical, has placed orders in advance of projected need to ensure inventory is able to be delivered in time for production plans.