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

Fair Value Measurements - Additional Information (Details)

v3.21.2
Fair Value Measurements - Additional Information (Details) - Evolv Technologies Holdings Inc [Member] - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair value assets of transfer level 1 to level 2       $ 0 $ 0 $ 0
Fair value assets of transfer level 2 to level 1       0 0 0
Fair value assets of transfer level 1 to level 3       0 0 0
Fair value liabilities of transfer level 1 to level 2       0 0 0
Fair value liabilities of transfer level 2 to level 1       0 0 0
Fair value liabilities of transfer level 1 to level 3       $ 0 $ 0 $ 0
2020 Convertible Notes            
Valuation of Embedded Derivative Liability            
Probability of completing the specified financing   100.00%        
Percentage of coversion price per share of securities by investors   80.00%        
Percentage of conversion option was deemed at fair value of capital stock   20.00%   20.00%    
Fair value of the embedded derivative at issuance   $ 1,000   $ 1,000    
2021 Convertible Notes            
Valuation of Embedded Derivative Liability            
Percentage of coversion price per share of securities by investors 80.00%   95.00%      
Percentage of conversion option was deemed at fair value of capital stock 20.00%          
Fair value of the embedded derivative at issuance $ 7,000          
Embedded derivative liability     $ 8,400