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Summary of Significant Accounting Policies - Debt issuance costs & Accounts receivable, net (Details)

v3.21.2
Summary of Significant Accounting Policies - Debt issuance costs & Accounts receivable, net (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, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Issuance Costs            
Debt issuance costs $ 0.1   $ 0.1   $ 0.1 $ 0.0
Amortization of the debt issuance costs $ 0.1 $ 0.1 $ 0.1 $ 0.1 0.1 0.0
Accounts Receivable, net            
Allowance for doubtful accounts           $ 0.1
Maximum            
Accounts Receivable, net            
Allowance for doubtful accounts         $ 0.1