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Net Loss per Share - Antidilutive effect (Details)

v3.21.2
Net Loss per Share - Antidilutive effect (Details) - Evolv Technologies Holdings, Inc. - shares
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 287,394,115 246,427,699 285,047,696 238,340,660
Options to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 57,173,375 28,348,557 49,679,554 29,488,684
Warrants to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 2,789,589 1,440,991 2,440,991 700,000
Convertible preferred stock (as converted to common stock)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 213,951,905 213,951,905 213,951,905 205,465,730
Warrants to purchase preferred stock (as converted to warrants to purchase common stock)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 2,686,246 2,686,246 2,686,246 2,686,246
Unvested restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 765,000      
Convertible notes (as converted to common stock)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 10,028,000   16,289,000