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Summary of Significant Accounting Policies - Contingently Issuable Common Stock (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 d $ / shares shares | Dec. 31, 2022 $ / shares
Business Acquisition, Contingent Consideration [Line Items] |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.0001 | $ 0.0001
Unvested restricted stock units |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Vesting period | 3 years |
Share-based Payment Arrangement, Tranche Two |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Number of trading days | d | 20 |
Number of consecutive trading days | d | 30 |
Share-based Payment Arrangement, Tranche Two | Maximum |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Vesting period | 5 years |
Share-based Payment Arrangement, Tranche Two | Minimum |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Share price (in dollars per share) | $ / shares | $ 12.50 |
Share-based Payment Arrangement, Tranche Three |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Vesting period | 5 years |
Number of trading days | d | 20 |
Number of consecutive trading days | d | 30 |
Share-based Payment Arrangement, Tranche Three | Minimum |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Share price (in dollars per share) | $ / shares | $ 15.00 |
Common Class B | Share-based Payment Arrangement, Tranche One |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Shares vested (in shares) | 1,897,500 |
Common Class B | Share-based Payment Arrangement, Tranche Two |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Shares vested (in shares) | 948,750 |
Common Class B | Share-based Payment Arrangement, Tranche Three |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Shares vested (in shares) | 948,750 |
Stock options |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Vesting period | 4 years |
Give Evolv LLC |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Remaining number of founder shares | 517,500 |
NHIC Sub Inc |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Shares outstanding (in shares) | 4,312,500 |
Common stock, par value (in dollars per share) | $ / shares | $ 0.0001 |

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