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

Summary of Significant Accounting Policies - Property and equipment (Details)

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Summary of Significant Accounting Policies - Property and equipment (Details) - Evolv Technologies Holdings Inc [Member]
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Lease term 4 years 4 years
Computers and telecommunications equipment    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 3 years 3 years
Lab equipment    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 5 years 5 years
Software    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 4 years 4 years
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 5 years 5 years
Leased equipment    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 7 years 7 years