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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 [Member] - Recurring Basis - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liabilities:      
Liabilities of fair value $ 10,168 $ 1,001 $ 1
Derivative Liability      
Liabilities:      
Liabilities of fair value 9,431 1,000 1
Common Stock Warrant      
Liabilities:      
Liabilities of fair value 737 1  
Level 3      
Liabilities:      
Liabilities of fair value 10,168 1,001 1
Level 3 | Derivative Liability      
Liabilities:      
Liabilities of fair value 9,431 1,000 $ 1
Level 3 | Common Stock Warrant      
Liabilities:      
Liabilities of fair value $ 737 $ 1