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

Convertible Preferred Stock - consisted of preferred stock (Details)

v3.21.2
Convertible Preferred Stock - consisted of preferred stock (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Temporary Equity [Line Items]          
Preferred Stock Issued and Outstanding 13,669,161 14,077,350      
Carrying Value $ 136,691,000 $ 140,774,000      
Evolv Technologies Holdings Inc [Member]          
Temporary Equity [Line Items]          
Preferred Stock Authorized 207,390,039 207,390,039   201,898,140  
Preferred Stock Issued and Outstanding 204,703,793 204,703,793 204,703,793 196,217,618 114,375,397
Carrying Value $ 75,877,000 $ 75,877,000 $ 75,877,000 $ 72,883,000 $ 43,441,000
Liquidation Preference $ 77,100,000 $ 77,100,000   $ 74,000,000  
Common Stock Issuable Upon Conversion 213,951,905 213,951,905   205,465,730  
Evolv Technologies Holdings Inc [Member] | Series A-1 Preferred Stock          
Temporary Equity [Line Items]          
Preferred Stock Authorized 67,156,152 67,156,152   67,156,152  
Preferred Stock Issued and Outstanding 64,469,906 64,469,906   64,469,906  
Carrying Value $ 18,394,000 $ 17,910,000   $ 17,910,000  
Liquidation Preference $ 18,000,000 $ 18,000,000   $ 18,000,000  
Common Stock Issuable Upon Conversion 64,469,906 64,469,906   64,469,906  
Evolv Technologies Holdings Inc [Member] | Series A Preferred Stock          
Temporary Equity [Line Items]          
Preferred Stock Authorized 9,233,677 9,233,677   9,233,677  
Preferred Stock Issued and Outstanding 9,233,677 9,233,677   9,233,677  
Carrying Value $ 11,321,000 $ 11,321,000   $ 11,321,000  
Liquidation Preference $ 11,819,000 $ 11,819,000   $ 11,819,000  
Common Stock Issuable Upon Conversion 18,481,789 18,481,789   18,481,789  
Evolv Technologies Holdings Inc [Member] | Series B-1 Preferred Stock          
Temporary Equity [Line Items]          
Preferred Stock Authorized 90,328,396 90,328,396   84,836,497  
Preferred Stock Issued and Outstanding 90,328,396 90,328,396   81,842,221  
Carrying Value $ 31,953,000 $ 31,953,000   $ 28,959,000  
Liquidation Preference $ 32,997,000 $ 32,997,000   $ 29,897,000  
Common Stock Issuable Upon Conversion 90,328,396 90,328,396   81,842,221  
Evolv Technologies Holdings Inc [Member] | Series B Preferred Stock          
Temporary Equity [Line Items]          
Preferred Stock Authorized 40,671,814 40,671,814   40,671,814  
Preferred Stock Issued and Outstanding 40,671,814 40,671,814   40,671,814  
Carrying Value $ 14,209,000 $ 14,209,000   $ 14,209,000  
Liquidation Preference $ 14,284,000 $ 14,284,000   $ 14,284,000  
Common Stock Issuable Upon Conversion 40,671,814 40,671,814   40,671,814