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

Warrants - Preferred stock and common stock outstanding (Details)

v3.21.2
Warrants - Preferred stock and common stock outstanding (Details) - $ / shares
Jun. 30, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]        
Shares Issuable Upon Exercise of Warrant       3,386,246
March 17, 2014        
Class of Warrant or Right [Line Items]        
Contractual Term       10 years
Shares Issuable Upon Exercise of Warrant       250,000
Warrants exercise price       $ 0.09
September 28, 2016        
Class of Warrant or Right [Line Items]        
Contractual Term       10 years
Shares Issuable Upon Exercise of Warrant       2,686,246
Warrants exercise price       $ 0.001
July 5, 2017        
Class of Warrant or Right [Line Items]        
Contractual Term       10 years
Shares Issuable Upon Exercise of Warrant       375,000
Warrants exercise price       $ 0.09
February 12, 2019        
Class of Warrant or Right [Line Items]        
Contractual Term       10 years
Shares Issuable Upon Exercise of Warrant       75,000
Warrants exercise price       $ 0.09
Evolv Technologies Holdings, Inc.        
Class of Warrant or Right [Line Items]        
Shares Issuable Upon Exercise of Warrant 5,127,237 5,127,237 740,991  
Warrants exercise price     $ 0.15  
Evolv Technologies Holdings, Inc. | March 17, 2014        
Class of Warrant or Right [Line Items]        
Contractual Term 10 years 10 years    
Shares Issuable Upon Exercise of Warrant 250,000 250,000    
Warrants exercise price $ 0.09 $ 0.09    
Evolv Technologies Holdings, Inc. | September 28, 2016        
Class of Warrant or Right [Line Items]        
Contractual Term 10 years 10 years    
Shares Issuable Upon Exercise of Warrant 2,686,246 2,686,246    
Warrants exercise price $ 0.001 $ 0.001    
Evolv Technologies Holdings, Inc. | July 5, 2017        
Class of Warrant or Right [Line Items]        
Contractual Term 10 years 10 years    
Shares Issuable Upon Exercise of Warrant 375,000 375,000    
Warrants exercise price $ 0.09 $ 0.09    
Evolv Technologies Holdings, Inc. | February 12, 2019        
Class of Warrant or Right [Line Items]        
Contractual Term 10 years 10 years    
Shares Issuable Upon Exercise of Warrant 75,000 75,000    
Warrants exercise price $ 0.09 $ 0.09    
Evolv Technologies Holdings, Inc. | March 30, 2020        
Class of Warrant or Right [Line Items]        
Contractual Term 10 years 10 years    
Shares Issuable Upon Exercise of Warrant 740,991 740,991    
Warrants exercise price $ 0.15 $ 0.15    
Evolv Technologies Holdings, Inc. | December 3, 2020        
Class of Warrant or Right [Line Items]        
Contractual Term 10 years 10 years    
Shares Issuable Upon Exercise of Warrant 1,000,000 1,000,000    
Warrants exercise price $ 0.16 $ 0.16