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

Long-term Debt - Convertible Notes 2019 (Details)

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Long-term Debt - Convertible Notes 2019 (Details) - Evolv Technologies Holdings Inc [Member] - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended
Oct. 31, 2019
Mar. 31, 2020
Sep. 30, 2019
Feb. 29, 2020
2019 Convertible Notes        
Debt Instrument [Line Items]        
Gross proceeds from issuance     $ 5.5  
Stated 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  
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