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

Subsequent Events (Details)

v3.21.2
Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Mar. 05, 2021
Jan. 21, 2021
Jun. 30, 2021
Aug. 31, 2021
Apr. 02, 2021
Feb. 04, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Subsequent Event [Line Items]                  
Shares Issuable Upon Exercise of Warrant                 3,386,246
Purchase price of share       $ 11.50          
Evolv Technologies Holdings, Inc.                  
Subsequent Event [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. | Subsequent events                  
Subsequent Event [Line Items]                  
Shares Issuable Upon Exercise of Warrant         6,756,653        
Warrants exercise price         $ 0.16        
Evolv Technologies Holdings, Inc. | Plan of merger with NHIC and Merger Sub | Subsequent events                  
Subsequent Event [Line Items]                  
Shares considered for exchange ratio 125,000,000                
Maximum number of earnout shares entitled to receive 15,000,000                
Period considered for closing share price 5 years                
Number of trading days considered for calculating the share price 20 days                
Threshold number of consecutive trading days taken for share price 30 days                
Evolv Technologies Holdings, Inc. | Subscription Agreements                  
Subsequent Event [Line Items]                  
Number of shares agreed to sell     30,000,000            
Purchase price of share     $ 10.00            
Aggregate purchase price     $ 300.0            
Evolv Technologies Holdings, Inc. | Subscription Agreements | Subsequent events                  
Subsequent Event [Line Items]                  
Number of shares agreed to sell 30,000,000                
Purchase price of share $ 10.00                
Aggregate purchase price $ 300.0                
Evolv Technologies Holdings, Inc. | 2021 Convertible Notes                  
Subsequent Event [Line Items]                  
Interest rate   8.00%       8.00%      
Evolv Technologies Holdings, Inc. | 2021 Convertible Notes | Subsequent events                  
Subsequent Event [Line Items]                  
Gross proceeds   $ 30.0              
Interest rate   8.00%              
Amount of notes convertible into shares   $ 100.0              
Conversion price as a percentage on price per share   80.00%