General form of registration statement for all companies including face-amount certificate companies

Property and Equipment, Net (Details)

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Property and Equipment, Net (Details) - Evolv Technologies Holdings, Inc. - USD ($)
$ in Thousands
 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
Property, Plant and Equipment [Line Items]            
Total property, plant and equipment $ 21,181   $ 21,181   $ 11,843 $ 5,147
Less: Accumulated depreciation and amortization (3,629)   (3,629)   (2,527) (1,461)
Total property, plant and equipment, net 17,552   17,552   9,316 3,686
Depreciation and amortization expense 600 $ 300 1,102 $ 394 1,065 535
Computers and telecom equipment            
Property, Plant and Equipment [Line Items]            
Total property, plant and equipment 217   217   217 217
Lab equipment            
Property, Plant and Equipment [Line Items]            
Total property, plant and equipment 494   494   487 487
Software            
Property, Plant and Equipment [Line Items]            
Total property, plant and equipment 59   59   59 59
Furniture and fixtures            
Property, Plant and Equipment [Line Items]            
Total property, plant and equipment 37   37   37 37
Leasehold improvements            
Property, Plant and Equipment [Line Items]            
Total property, plant and equipment 553   553   95 95
Leased equipment            
Property, Plant and Equipment [Line Items]            
Total property, plant and equipment $ 19,821   $ 19,821   $ 10,948 $ 4,252