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Nature of the Business and Basis of Presentation - Proposed Merger (Details) - Evolv Technologies Holdings Inc [Member]	3 Months Ended
	Mar. 31, 2021
Exchange Ratio	0.378
As previously reported
Exchange Ratio	0.382

X

- Definition

Represents the exchange ratio that was initially estimated as of the date of the execution of the Merger Agreement.

+ References

No definition available.

+ Details

Name:	evlv_ExchangeRatio
Namespace Prefix:	evlv_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=evlv_EvolvTechnologiesHoldingsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: