Evolv Technologies Holdings, Inc. Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Company utilized Black-Scholes pricing model (Details)

Stock Based Compensation - Company utilized Black-Scholes pricing model (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) Vote shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Vote shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Common stock warrant liability					$ 1
Stock compensation expense	$ 2,396	$ 403	$ 4,013	$ 525
Sales and marketing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Stock compensation expense	990	$ 41	2,298	$ 81
Finback BDA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Common stock warrant liability	$ 19,600		$ 19,600
Shares issuable upon exercise of warrant \| shares	131,028		131,028
Aggregate intrinsic value of warrants exercisable	$ 1,000		$ 1,000
Number of warrants exercised \| shares			0
Intrinsic value of warrants unvested	18,400		$ 18,400
Finback BDA \| Sales and marketing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Stock compensation expense			$ 1,000
Finback BDA \| Sales and marketing \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Stock compensation expense	$ 100
Finback BDA \| Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| Vote	0.4		0.4
Finback BDA \| Expected term (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| Vote	3.0		3.0
Finback BDA \| Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| Vote	23.9		23.9
Finback BDA \| Expected dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| Vote	0.0		0.0