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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 |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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