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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 [Member] - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations $ 13,081 $ 11,844
Product revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 94  
Subscription revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 11,849 10,759
Maintenance revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 1,138 $ 1,085
2021-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 4,508  
2021-01-01 | Product revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 43  
2021-01-01 | Subscription revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 4,119  
2021-01-01 | Maintenance revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 346  
2022-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 8,573  
2022-01-01 | Product revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 51  
2022-01-01 | Subscription revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations 7,730  
2022-01-01 | Maintenance revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining Performance Obligations $ 792