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

Stock Based Compensation (Details)

v3.21.2
Stock Based Compensation (Details) - Evolv Technologies Holdings Inc [Member] - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares remained available for future grant 290,581,211 2,592,202 271,350,898 264,360,106
Number of options to purchase common stock 17,130,123   24,558,325  
Intrinsic value of options exercised $ 12,123,000.000 $ 100,000 $ 75,000  
Weighted average grant-date fair value per share of options granted $ 0.50 $ 0    
Unrecognized compensation expense related to unvested stock options $ 3,900,000   $ 1,000,000 $ 500,000
Weighted average period expected of recognition 1 year 6 months   1 year 2 months 12 days 1 year
2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock may be issued 325,991,899 305,491,899 305,491,899 300,000,000
Number of shares remained available for future grant 5,272,079   2,592,202 26,019,446
Term of stock option 10 years      
Vesting period 4 years   4 years  
Number of options to purchase common stock 17,130,123   24,558,325 10,015,850
Maximum | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock may be issued     2,852,300  
Term of stock option     10 years  
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options to purchase common stock 6,756,653      
Intrinsic value of options exercised     $ 300,000  
Weighted average grant-date fair value per share of options granted     $ 0.5 $ 0.5
Stock options | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock may be issued 2,852,300      
Stock options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of options exercised       $ 100,000