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Summary of Significant Accounting Policies - Operating lease components (Details)

v3.21.2
Summary of Significant Accounting Policies - Operating lease components (Details) - Evolv Technologies Holdings, Inc. - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 25,609 $ 11,844
Product revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 337  
Subscription revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 22,415 10,759
Maintenance revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 2,857 1,085
Less Than 1 Year [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount   3,977
Less Than 1 Year [Member] | Subscription revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount   3,636
Less Than 1 Year [Member] | Maintenance revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount   341
Greater Than 1 Year [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount   7,867
Greater Than 1 Year [Member] | Subscription revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount   7,123
Greater Than 1 Year [Member] | Maintenance revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount   $ 744