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

Summary of Significant Accounting Policies - Stock-based compensation (Details)

v3.21.2
Summary of Significant Accounting Policies - Stock-based compensation (Details) - Evolv Technologies Holdings Inc [Member] - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted   17,130,123   24,558,325  
Stock compensation expense   $ 1,082 $ 62 $ 662 $ 264
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted   6,756,653      
Stock compensation expense   $ 203 $ 62 $ 100  
Stock options | Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted 1,481,982     1,481,982  
Stock compensation expense       $ 100