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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 [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Issuance Costs        
Debt issuance costs $ 0.0   $ 0.1 $ 0.0
Amortization of the debt issuance costs $ 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