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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 [Member] - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2020
Oct. 31, 2019
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2021
Dec. 31, 2020
Feb. 29, 2020
2019 Convertible Notes              
Debt Instrument [Line Items]              
Gross proceeds from issuance       $ 5.5      
Interest rate       8.00%      
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       85.00%      
Embedded derivative fair value       $ 0.9      
Initial carrying value       $ 4.6      
2020 Convertible Notes              
Debt Instrument [Line Items]              
Gross proceeds from issuance $ 2.0            
Interest rate 6.00%            
Minimum gross proceeds from sale of preferred stock required for conversion $ 10.0            
Additional proceeds made available $ 2.0            
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  
Total interest incurred         $ 0.1 $ 0.1  
Series B-1 Preferred Stock              
Debt Instrument [Line Items]              
Number of shares issued upon conversion of debt   18,056,296 8,486,175        
Conversion price per share   $ 0.3105 $ 0.3653       $ 0.3653
Series B-1 Preferred Stock | 2019 Convertible Notes              
Debt Instrument [Line Items]              
Number of shares issued upon conversion of debt   18,056,296          
Conversion price per share   $ 0.3105          
Total interest incurred   $ 0.4          
Series B-1 Preferred Stock | 2020 Convertible Notes              
Debt Instrument [Line Items]              
Minimum gross proceeds from sale of preferred stock required for conversion $ 10.0