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Income Taxes (Details) - USD ($)	2 Months Ended	3 Months Ended	11 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Components of the Company's loss before income tax expense
Loss before income tax provision	$ (2,000)	$ (4,082,000)	$ (11,912,000)
Provision for income taxes	$ 0	$ 0
Evolv Technologies Holdings Inc [Member]
Components of the Company's loss before income tax expense
United States				$ (27,066,000)	$ (19,238,000)
Foreign				(326,000)	(619,000)
Loss before income tax provision				(27,392,000)	(19,857,000)
Provision for income taxes				$ 0	$ 0

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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