| Cover | Mar. 31, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 31, 2022 |
| Entity File Number | 001-39417 |
| Entity Registrant Name | Evolv Technologies Holdings, Inc. |
| Entity Central Index Key | 0001805385 |
| Entity Tax Identification Number | 84-4473840 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 500 Totten Pond Road |
| Entity Address, Address Line Two | 4th Floor |
| Entity Address, City or Town | Waltham |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02451 |
| City Area Code | 781 |
| Local Phone Number | 374-8100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Common Class A [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | EVLV |
| Security Exchange Name | NASDAQ |
| Warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants to purchase one share of Class A common stock |
| Trading Symbol | EVLVW |
| Security Exchange Name | NASDAQ |
