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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 [Member] - shares
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 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 293,135,368 246,823,116 285,047,696 238,340,660
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 62,597,226 28,743,974 49,679,554 29,488,684
Common Stock Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 2,440,991 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
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 note        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of diluted net loss per share 10,694,000   16,289,000