Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Nov. 08, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-39417
Entity Registrant Name	Evolv Technologies Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-4473840
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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		151,134,622
Entity Central Index Key	0001805385
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A Common Stock
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
Warrants to purchase one share of Class A common stock
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