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

Warrants - fair value of warrants (Details)

v3.21.2
Warrants - fair value of warrants (Details) - USD ($)
3 Months Ended 6 Months Ended 11 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Class of Warrant or Right [Line Items]          
Changes in the fair value of warrants $ 959,000   $ 3,605,000   $ 10,571,000
Evolv Technologies Holdings, Inc.          
Class of Warrant or Right [Line Items]          
Changes in the fair value of warrants $ 185,000 $ 0 $ 921,000 $ 0