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Summary of Significant Accounting Policies - Contract acquisition costs (Details)

v3.21.2
Summary of Significant Accounting Policies - Contract acquisition costs (Details) - Evolv Technologies Holdings, Inc. - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Deferred asset $ 3.0     $ 3.0     $ 2.3 $ 0.5
Amortized commissions $ 0.3 $ 0.1 $ 0.0 $ 0.3 $ 0.2 $ 0.1 $ 0.1