<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>536</ContextCount>
  <ElementCount>595</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>149</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - Consolidated Statements of Operations and Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/StatementConsolidatedStatementsOfOperationsAndComprehensiveLoss</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75050 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75060 - Disclosure - Cybersecurity Risk Management, Strategy and Governance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance</Role>
      <ShortName>Cybersecurity Risk Management, Strategy and Governance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995457 - Disclosure - Description of Business and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DescriptionofBusinessandBasisofPresentation</Role>
      <ShortName>Description of Business and Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995467 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995477 - Disclosure - Basic and Diluted Net Loss per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureBasicAndDilutedNetLossPerShare</Role>
      <ShortName>Basic and Diluted Net Loss per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995487 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995497 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/Investments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995507 - Disclosure - Balance Sheet Components</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponents</Role>
      <ShortName>Balance Sheet Components</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995517 - Disclosure - Equipment Subject to Operating Lease, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureEquipmentSubjectToOperatingLeaseNet</Role>
      <ShortName>Equipment Subject to Operating Lease, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995527 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995537 - Disclosure - Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebt</Role>
      <ShortName>Long-Term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995547 - Disclosure - Equity Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityInstruments</Role>
      <ShortName>Equity Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995557 - Disclosure - Equity Incentive Plans and Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensation</Role>
      <ShortName>Equity Incentive Plans and Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995567 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995577 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995587 - Disclosure - Employee Defined-Contribution Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EmployeeDefinedContributionPlans</Role>
      <ShortName>Employee Defined-Contribution Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995597 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/Revenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995617 - Disclosure - Momentus Master Service Agreement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureMomentusMasterServiceAgreement</Role>
      <ShortName>Momentus Master Service Agreement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995627 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995637 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/SummaryofSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995647 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995657 - Disclosure - Basic and Diluted Net Loss per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureBasicAndDilutedNetLossPerShareTables</Role>
      <ShortName>Basic and Diluted Net Loss per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/DisclosureBasicAndDilutedNetLossPerShare</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995667 - Disclosure - Fair Value Measures and Disclosures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/FairValueMeasuresandDisclosuresTables</Role>
      <ShortName>Fair Value Measures and Disclosures (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995687 - Disclosure - Balance Sheet Components (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsTables</Role>
      <ShortName>Balance Sheet Components (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponents</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995697 - Disclosure - Equipment Subject to Operating Lease, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureEquipmentSubjectToOperatingLeaseNetTables</Role>
      <ShortName>Equipment Subject to Operating Lease, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/DisclosureEquipmentSubjectToOperatingLeaseNet</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995707 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/Leases</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995717 - Disclosure - Long-Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebtTables</Role>
      <ShortName>Long-Term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebt</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995727 - Disclosure - Equity Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityInstrumentsTables</Role>
      <ShortName>Equity Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/EquityInstruments</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995737 - Disclosure - Equity Incentive Plans and Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensationTables</Role>
      <ShortName>Equity Incentive Plans and Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensation</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995747 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/IncomeTaxes</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995757 - Disclosure - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/RevenueTables</Role>
      <ShortName>Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/Revenue</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995777 - Disclosure - Description of Business and Basis of Presentation - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DescriptionofBusinessandBasisofPresentationNarrativeDetails</Role>
      <ShortName>Description of Business and Basis of Presentation - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/DescriptionofBusinessandBasisofPresentation</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995787 - Disclosure - Description of Business and Basis of Presentation - Going Concern, and Liquidity and Capital Resources (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DescriptionofBusinessandBasisofPresentationGoingConcernandLiquidityandCapitalResourcesDetails</Role>
      <ShortName>Description of Business and Basis of Presentation - Going Concern, and Liquidity and Capital Resources (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995797 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995807 - Disclosure - Summary of Significant Accounting Policies - Cash and Cash Equivalents and Restricted Cash (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsAndRestrictedCashDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Cash and Cash Equivalents and Restricted Cash (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995817 - Disclosure - Summary of Significant Accounting Policies - Revenue Recognition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Revenue Recognition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995827 - Disclosure - Summary of Significant Accounting Policies - Summary of Revisions to Previously Issued Condensed Consolidated Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfRevisionsToPreviouslyIssuedCondensedConsolidatedBalanceSheetsDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Summary of Revisions to Previously Issued Condensed Consolidated Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995837 - Disclosure - Summary of Significant Accounting Policies - Summary of Revisions to Previously Issued Consolidated Statement of Operations and Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfRevisionsToPreviouslyIssuedConsolidatedStatementOfOperationsAndComprehensiveIncome</Role>
      <ShortName>Summary of Significant Accounting Policies - Summary of Revisions to Previously Issued Consolidated Statement of Operations and Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995847 - Disclosure - Summary of Significant Accounting Policies - Summary of Revisions to Previously Issued Condensed Consolidated Statement of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfRevisionsToPreviouslyIssuedCondensedConsolidatedStatementOfCashFlowsDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Summary of Revisions to Previously Issued Condensed Consolidated Statement of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995857 - Disclosure - Summary of Significant Accounting Policies - Summary of Income Tax Provision previously issued (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfIncomeTaxProvisionPreviouslyIssuedDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Summary of Income Tax Provision previously issued (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995867 - Disclosure - Summary of Significant Accounting Policies - Deferred Tax Assets as restated to from the previously issued (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesDeferredTaxAssetsAsRestatedToFromThePreviouslyIssuedDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Deferred Tax Assets as restated to from the previously issued (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995877 - Disclosure - Basic and Diluted Net Loss per Share - Computation of Basic and Diluted Net Loss Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureBasicAndDilutedNetLossPerShareComputationOfBasicAndDilutedNetLossPerShareDetails</Role>
      <ShortName>Basic and Diluted Net Loss per Share - Computation of Basic and Diluted Net Loss Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995887 - Disclosure - Basic and Diluted Net Loss per Share - Potentially Dilutive Securities Excluded from Computation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureBasicAndDilutedNetLossPerSharePotentiallyDilutiveSecuritiesExcludedFromComputationDetails</Role>
      <ShortName>Basic and Diluted Net Loss per Share - Potentially Dilutive Securities Excluded from Computation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995897 - Disclosure - Fair Value Measures and Disclosures - Assets and Liabilities Measured on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/FairValueMeasuresandDisclosuresAssetsandLiabilitiesMeasuredonRecurringBasisDetails</Role>
      <ShortName>Fair Value Measures and Disclosures - Assets and Liabilities Measured on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995907 - Disclosure - Fair Value Measurements - Changes in Fair Value of Level 3 Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/FairValueMeasurementsChangesinFairValueofLevel3FinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Measurements - Changes in Fair Value of Level 3 Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995917 - Disclosure - Investments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/InvestmentsNarrativeDetails</Role>
      <ShortName>Investments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995927 - Disclosure - Balance Sheet Components - Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsAccountsReceivableDetails</Role>
      <ShortName>Balance Sheet Components - Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995937 - Disclosure - Balance Sheet Components - Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsInventoriesDetails</Role>
      <ShortName>Balance Sheet Components - Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995947 - Disclosure - Balance Sheet Components - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureBalanceSheetComponentsNarrativeDetails</Role>
      <ShortName>Balance Sheet Components - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995957 - Disclosure - Balance Sheet Components - Prepaid expenses and other current assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsPrepaidexpensesandothercurrentassetsDetails</Role>
      <ShortName>Balance Sheet Components - Prepaid expenses and other current assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995967 - Disclosure - Balance Sheet Components - Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsPropertyandEquipmentNetDetails</Role>
      <ShortName>Balance Sheet Components - Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>995977 - Disclosure - Balance Sheet Components - Other Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsOtherAssetsDetails</Role>
      <ShortName>Balance Sheet Components - Other Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>995987 - Disclosure - Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsAccruedExpensesandOtherCurrentLiabilitiesDetails</Role>
      <ShortName>Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>995997 - Disclosure - Balance Sheet Components - Schedule of Fair Value Assumptions Used For Valuation Liablity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureBalanceSheetComponentsScheduleOfFairValueAssumptionsUsedForValuationLiablityDetails</Role>
      <ShortName>Balance Sheet Components - Schedule of Fair Value Assumptions Used For Valuation Liablity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996007 - Disclosure - Balance Sheet Components - Other Noncurrent Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/BalanceSheetComponentsOtherNoncurrentLiabilitiesDetails</Role>
      <ShortName>Balance Sheet Components - Other Noncurrent Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996017 - Disclosure - Equipment Subject to Operating Lease, Net - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureEquipmentSubjectToOperatingLeaseNetNarrativeDetails</Role>
      <ShortName>Equipment Subject to Operating Lease, Net - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996027 - Disclosure - Equipment Subject to Operating Lease, Net - Schedule of Equipment Subject to Operating Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureEquipmentSubjectToOperatingLeaseNetScheduleOfEquipmentSubjectToOperatingLeaseDetails</Role>
      <ShortName>Equipment Subject to Operating Lease, Net - Schedule of Equipment Subject to Operating Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996037 - Disclosure - Equipment Subject to Operating Lease, Net - Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureEquipmentSubjectToOperatingLeaseNetLeasePaymentsDetails</Role>
      <ShortName>Equipment Subject to Operating Lease, Net - Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996047 - Disclosure - Leases - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/LeasesNarrativeDetails</Role>
      <ShortName>Leases - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996057 - Disclosure - Leases - Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/LeasesAssetsandLiabilitiesDetails</Role>
      <ShortName>Leases - Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996067 - Disclosure - Leases - Lease-Related Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/LeasesLeaseRelatedBalancesDetails</Role>
      <ShortName>Leases - Lease-Related Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996077 - Disclosure - Leases - Future Minimum Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/LeasesFutureMinimumLeasePaymentsDetails</Role>
      <ShortName>Leases - Future Minimum Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996097 - Disclosure - Long-Term Debt - Components (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebtComponentsDetails</Role>
      <ShortName>Long-Term Debt - Components (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996107 - Disclosure - Long-Term Debt - Convertible Secured Note (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebtConvertibleSecuredNoteDetails</Role>
      <ShortName>Long-Term Debt - Convertible Secured Note (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996117 - Disclosure - Long-Term Debt - Secured Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebtSecuredNotesDetails</Role>
      <ShortName>Long-Term Debt - Secured Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996127 - Disclosure - Long-Term Debt - 2025 Equipment Loan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebt2025EquipmentLoanDetails</Role>
      <ShortName>Long-Term Debt - 2025 Equipment Loan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996137 - Disclosure - Long-Term Debt - Schedule of Future Minimum Aggregate Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureLongtermDebtScheduleOfFutureMinimumAggregatePaymentsDetails3</Role>
      <ShortName>Long-Term Debt - Schedule of Future Minimum Aggregate Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996147 - Disclosure - Equity Instruments - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureEquityInstrumentsAdditionalInformationDetails</Role>
      <ShortName>Equity Instruments - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996157 - Disclosure - Equity Instruments - Common Stock Reserved for Issuance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityInstrumentsCommonStockReservedforIssuanceDetails</Role>
      <ShortName>Equity Instruments - Common Stock Reserved for Issuance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996167 - Disclosure - Equity Instruments - Warrants for Shares of Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityInstrumentsWarrantsforSharesofStockDetails</Role>
      <ShortName>Equity Instruments - Warrants for Shares of Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996177 - Disclosure - Equity Instruments - Rollforward of Warrant Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureEquityInstrumentsRollforwardOfWarrantLiabilityDetails</Role>
      <ShortName>Equity Instruments - Rollforward of Warrant Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996187 - Disclosure - Equity Instruments - Fair Value Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityInstrumentsFairValueAssumptionsDetails</Role>
      <ShortName>Equity Instruments - Fair Value Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996197 - Disclosure - Equity Instruments - Rollforward of Contingent Earnout Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityInstrumentsRollforwardofContingentEarnoutLiabilitiesDetails</Role>
      <ShortName>Equity Instruments - Rollforward of Contingent Earnout Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996207 - Disclosure - Equity Instruments - Contingent Earnout Liabilities, Fair Value Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityInstrumentsContingentEarnoutLiabilitiesFairValueAssumptionsDetails</Role>
      <ShortName>Equity Instruments - Contingent Earnout Liabilities, Fair Value Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996217 - Disclosure - Equity Incentive Plans and Stock-Based Compensation - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensationNarrativeDetails</Role>
      <ShortName>Equity Incentive Plans and Stock-Based Compensation - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensationTables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996227 - Disclosure - Equity Incentive Plans and Stock-Based Compensation - Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensationStockOptionsDetails</Role>
      <ShortName>Equity Incentive Plans and Stock-Based Compensation - Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996237 - Disclosure - Equity Incentive Plans and Stock-Based Compensation - RSUs Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensationRSUsActivityDetails</Role>
      <ShortName>Equity Incentive Plans and Stock-Based Compensation - RSUs Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996247 - Disclosure - Equity Incentive Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EquityIncentivePlansandStockBasedCompensationStockBasedCompensationExpenseDetails</Role>
      <ShortName>Equity Incentive Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996267 - Disclosure - Income Taxes - Schedule of Recorded Pretax Book Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfRecordedPretaxBookIncomeLossDetails</Role>
      <ShortName>Income Taxes - Schedule of Recorded Pretax Book Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996277 - Disclosure - Income Taxes - Schedule of Income Tax Expense (Benefit) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfIncomeTaxExpenseBenefitDetails</Role>
      <ShortName>Income Taxes - Schedule of Income Tax Expense (Benefit) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996287 - Disclosure - Income Taxes - Schedule of Income Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfIncomeTaxRateReconciliationDetails</Role>
      <ShortName>Income Taxes - Schedule of Income Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996297 - Disclosure - Income Taxes - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails</Role>
      <ShortName>Income Taxes - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996307 - Disclosure - Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfComponentsOfDeferredTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996317 - Disclosure - Income Taxes - Schedule of Reconciliation of Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>Income Taxes - Schedule of Reconciliation of Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996327 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureCommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>93</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996337 - Disclosure - Employee Defined-Contribution Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/EmployeeDefinedContributionPlansDetails</Role>
      <ShortName>Employee Defined-Contribution Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://velo3d.com/20251231/taxonomy/role/EmployeeDefinedContributionPlans</ParentRole>
      <Position>94</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996347 - Disclosure - Revenue - Concentration of Credit Risk and Other Risks and Uncertainties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/RevenueConcentrationofCreditRiskandOtherRisksandUncertaintiesDetails</Role>
      <ShortName>Revenue - Concentration of Credit Risk and Other Risks and Uncertainties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996357 - Disclosure - Revenue - Revenue by Geographic Area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/RevenueRevenuebyGeographicAreaDetails</Role>
      <ShortName>Revenue - Revenue by Geographic Area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>996367 - Disclosure - Revenue - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/RevenueNarrativeDetails</Role>
      <ShortName>Revenue - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>996377 - Disclosure - At-the-Market Offering (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureAtthemarketOfferingAdditionalInformationDetails</Role>
      <ShortName>At-the-Market Offering (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="velo-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>996387 - Disclosure - Momentus Master Service Agreement - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://velo3d.com/20251231/taxonomy/role/DisclosureMomentusMasterServiceAgreementAdditionalInformationDetails</Role>
      <ShortName>Momentus Master Service Agreement - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="velo-20251231.htm">velo-20251231.htm</File>
    <File>velo-20251231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img110392366_0.jpg</File>
    <File>img110392366_1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1673">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="40">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
