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Nature of the Business and Basis of Presentation - Going Concen (Details) - USD ($)
 2 Months Ended 3 Months Ended 8 Months Ended 11 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Net loss attributable to common stockholders ? basic and diluted $ (2,000) $ (4,082,000)   $ (390,000) $ (11,912,000)    
Cash outflows from operating activities $ 10,000 (749,000)     (454,000)    
Accumulated deficit   (15,994,000)     (11,912,000) $ (11,912,000)  
Evolv Technologies Holdings Inc [Member]              
Net loss attributable to common stockholders ? basic and diluted   (13,755,000) $ (6,430,000)     (27,392,000) $ (19,857,000)
Cash outflows from operating activities   (12,038,000) $ (8,396,000)     (23,254,000) (15,178,000)
Accumulated deficit   $ (107,636,000)     $ (93,881,000) $ (93,881,000) $ (66,489,000)