Summary of Significant Accounting Policies - Contract acquisition costs (Details) - Evolv Technologies Holdings Inc [Member] - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Mar. 31, 2021 |
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| Deferred asset | $ 2.3 | $ 0.5 | $ 2.7 |
| Amortized commissions | $ 0.1 | $ 0.1 | |
| X | ||||||||||
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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