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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