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Derivative Instruments - Narrative (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
day
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Aug. 20, 2021
USD ($)
shares
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Number of warrants issued (in shares) | shares     1  
Warrants outstanding fair value | $     $ 1,700,000 $ 17,900,000
Exercise price of warrants or rights (in dollars per share)     $ 8.50  
Warrants and rights outstanding, term     5 years  
Threshold consecutive trading days ending on the third day prior to notice of redemption   10 days    
Conversion of interest payable on convertible notes (in shares) | shares     319,411  
Proceeds from exercise of Legacy Xos Preferred Stock warrant | $ $ 2,700,000 $ 2,715,000 $ 0  
Embedded derivative liability on convertible notes | $   $ 0 $ 6,400,000  
Warrant Redemption Scenario One        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Redemption, stock price threshold (in dollars per share)   $ 18.00    
Redemption price (in dollars per share)   $ 0.01    
Redemption notice period   30 days    
Redemption, threshold trading days | day   20    
Redemption, threshold consecutive trading days   30 days    
Redemption period   30 days    
Warrant Redemption Scenario Two        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Redemption, stock price threshold (in dollars per share)   $ 10.00    
Redemption price (in dollars per share)   $ 0.10    
Redemption notice period   30 days    
Reference value (in dollars per share)   $ 18.00    
Common Stock Public Warrants        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Number of warrants issued (in shares) | shares   18,480,973   12,499,964
Warrants outstanding fair value | $   $ 7,400,000    
Exercise price of warrants or rights (in dollars per share)   $ 11.50    
Private Placement Warrants        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Number of warrants issued (in shares) | shares   352,325   6,333,334
Warrants outstanding fair value | $   $ 140,225