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

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value On Recurring Basis (Details)

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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value On Recurring Basis (Details) - Evolv Technologies Holdings, Inc. - Recurring Basis - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets:      
Total assets measured at fair value $ 7,982    
Liabilities:      
Liabilities of fair value 21,128 $ 1,001 $ 1
Warrants to purchase common stock      
Liabilities:      
Liabilities of fair value 922 1 1
Derivative Liability      
Liabilities:      
Liabilities of fair value 20,206 1,000  
Money market funds      
Assets:      
Total assets measured at fair value 7,982    
Level 1      
Assets:      
Total assets measured at fair value 7,982    
Level 1 | Money market funds      
Assets:      
Total assets measured at fair value 7,982    
Level 3      
Liabilities:      
Liabilities of fair value 21,128 1,001 1
Level 3 | Warrants to purchase common stock      
Liabilities:      
Liabilities of fair value 922 1 $ 1
Level 3 | Derivative Liability      
Liabilities:      
Liabilities of fair value $ 20,206 $ 1,000