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Recapitalization and Contingent Earn-out Shares Liability - Schedule of Recapitalization (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 20, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Recapitalization [Line Items] |  |  |
Cash from NextGen trust, net of redemptions |  | $ 76,145 |
Proceeds from PIPE investment |  | 196,000 | $ 0
Less: fees paid to the underwriters, including NextGen’s IPO underwriters |  | (24,285) |
Less: other transaction costs |  | (31,139) |
Net cash received from the business combination |  | $ 216,721 |
Third party PIPE investors (in shares) |  | 19,600,000 |
Stock issued during period, shares, reverse recapitalization (in shares) | 142,584,621 | 162,184,621 |
NextGen Sponsor And Related Parties |  |  |
Schedule Of Recapitalization [Line Items] |  |  |
Stock issued during period, shares, reverse recapitalization (in shares) |  | 7,613,884 |
Public Shareholders |  |  |
Schedule Of Recapitalization [Line Items] |  |  |
Stock issued during period, shares, reverse recapitalization (in shares) |  | 9,375,000 |
Xos Shareholders |  |  |
Schedule Of Recapitalization [Line Items] |  |  |
Stock issued during period, shares, reverse recapitalization (in shares) |  | 125,595,737 |

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