General form of registration statement for all companies including face-amount certificate companies

Warrants (Details)

v3.21.2
Warrants (Details) - USD ($)
1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Feb. 28, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]                
Issuance of equity classified warrants           $ 1,336,000    
Evolv Technologies Holdings Inc [Member]                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock 5,127,237 740,991   5,127,237 740,991 5,127,237 5,127,237 3,386,246
Exercise price   $ 0.15     $ 0.15      
Issuance of equity classified warrants       $ 1,000 $ 45,000   $ 112,000 $ 3,000
Evolv Technologies Holdings Inc [Member] | 2019 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock     75,000          
Exercise price     $ 0.09          
Issuance of equity classified warrants     $ 100,000          
Evolv Technologies Holdings Inc [Member] | 2020 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock   740,991     740,991      
Exercise price   $ 0.15     $ 0.15      
Issuance of equity classified warrants   $ 100,000            
Evolv Technologies Holdings Inc [Member] | 2020 JPM Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock 1,000,000         1,000,000 1,000,000  
Exercise price $ 0.16         $ 0.16 $ 0.16  
Issuance of equity classified warrants $ 100,000              
Evolv Technologies Holdings Inc [Member] | Maximum | 2019 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Issuance of equity classified warrants     $ 100,000          
Evolv Technologies Holdings Inc [Member] | Maximum | 2020 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Issuance of equity classified warrants   $ 100,000            
Evolv Technologies Holdings Inc [Member] | Maximum | 2020 JPM Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Issuance of equity classified warrants $ 100,000