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

Stock Based Compensation - weighted average grant-date fair Additional (Details)

v3.21.2
Stock Based Compensation - weighted average grant-date fair Additional (Details) - $ / shares
Jun. 30, 2021
Jan. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Issuable Upon Exercise of Warrant         3,386,246
Evolv Technologies Holdings, Inc.          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Issuable Upon Exercise of Warrant 5,127,237   5,127,237 740,991  
Warrants exercise price       $ 0.15  
Evolv Technologies Holdings, Inc. | Finback BDA          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Issuable Upon Exercise of Warrant   6,756,653      
Warrants exercise price   $ 0.16