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

Stock Based Compensation (Details)

v3.21.2
Stock Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
2013 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term of stock option     10 years      
Evolv Technologies Holdings, Inc.            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares remained available for future grant 289,195,124   289,195,124   271,350,898 264,360,106
Number of options to purchase common stock     17,130,123   24,558,325  
Intrinsic value of options exercised $ 4,000,000.0 $ 100,000 $ 16,132,000 $ 100,000 $ 75,000  
Weighted average grant-date fair value per share of options granted   $ 0 $ 0.05 $ 0    
Unrecognized compensation expense related to unvested stock options $ 3,600,000   $ 3,600,000   $ 1,000,000.0 $ 500,000
Weighted average period expected of recognition     1 year 6 months   1 year 2 months 12 days 1 year
Evolv Technologies Holdings, Inc. | 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   325,991,899   305,491,899 300,000,000
Number of shares remained available for future grant 5,420,954   5,420,954   2,592,202 26,019,446
Vesting period     4 years   4 years  
Number of options to purchase common stock 0   17,130,123   24,558,325 10,015,850
Evolv Technologies Holdings, Inc. | 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  
Evolv Technologies Holdings, Inc. | Options to purchase common stock            
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
Evolv Technologies Holdings, Inc. | Options to purchase common stock | 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   2,852,300      
Evolv Technologies Holdings, Inc. | Options to purchase common stock | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Intrinsic value of options exercised           $ 100,000