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Long-term Debt - Long-term debt (Details)

v3.21.2
Long-term Debt - Long-term debt (Details) - Evolv Technologies Holdings Inc [Member] - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Gross amount of debt $ 43,053 $ 16,550  
Long-term Debt. 42,939 16,432 $ 3,419
Less: Unamortized discount (114) (118)  
Long-term debt, current and noncurrent 42,939 16,432 3,419
Less: Current portion of long-term debt 24,515   3,419
Long-term debt, net of discount 18,424 16,432  
Term loans payable      
Debt Instrument [Line Items]      
Gross amount of debt 10,000 10,000 $ 3,419
Revolving line of credit outstanding      
Debt Instrument [Line Items]      
Gross amount of debt 5,421 3,550  
Convertible note      
Debt Instrument [Line Items]      
Gross amount of debt $ 27,632 $ 3,000