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Long-term Debt - Convertible notes 2020 (Details)

v3.21.2
Long-term Debt - Convertible notes 2020 (Details) - Evolv Technologies Holdings, Inc. - 2020 Convertible Notes - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Gross proceeds from issuance $ 2.0      
Stated interest rate 6.00%      
Additional gross proceeds made available upon achievement of the integration milestone $ 2.0      
Minimum gross proceeds from sale of preferred stock required for conversion $ 10.0      
Conversion price as percentage of the price per share paid by the other investors 80.00%      
Embedded derivative fair value $ 1.0      
Initial carrying value 3.0      
Accrued interest, current   $ 0.1 $ 0.1 $ 0.1
Total interest incurred   $ 0.1 $ 0.3 $ 0.1
Series B-1 Preferred Stock        
Debt Instrument [Line Items]        
Minimum gross proceeds from sale of preferred stock required for conversion $ 10.0