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Summary of Significant Accounting Policies - Product Warranties (Details)

v3.21.2
Summary of Significant Accounting Policies - Product Warranties (Details) - Evolv Technologies Holdings, Inc. - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Product Warranty Liability [Line Items]    
Warranty accrual $ 0.1 $ 0.1
Minimum    
Product Warranty Liability [Line Items]    
Term of limited assurance warranty on products sales 1 year  
Maximum    
Product Warranty Liability [Line Items]    
Term of limited assurance warranty on products sales 2 years  
Warranty accrual $ 0.1 $ 0.1