Income Taxes - Tax Credit (Details) - Evolv Technologies Holdings, Inc. - Research and development - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Federal | ||
| Tax Credit Carryforward [Line Items] | ||
| Research and development tax credit carryforwards | $ 2.5 | $ 1.2 |
| State | ||
| Tax Credit Carryforward [Line Items] | ||
| Research and development tax credit carryforwards | $ 1.7 | $ 0.8 |
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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