<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>274</ContextCount>
  <ElementCount>362</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>111</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995300 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995301 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/CondensedConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995302 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/CondensedConsolidatedBalanceSheetsUnauditedParentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995303 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/CondensedConsolidatedStatementsofOperationsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995304 - Statement - Condensed Consolidated Statements of Mezzanine Equity and Stockholders??? Deficit (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/CondensedConsolidatedStatementsofMezzanineEquityandStockholdersDeficitUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Mezzanine Equity and Stockholders??? Deficit (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995305 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/CondensedConsolidatedStatementsofCashFlowsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995306 - Disclosure - Organization and Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/OrganizationandDescriptionofBusiness</Role>
      <ShortName>Organization and Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995307 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995308 - Disclosure - Reverse Recapitalization</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/ReverseRecapitalization</Role>
      <ShortName>Reverse Recapitalization</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995309 - Disclosure - Revenue Recognition from Contracts with Customers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/RevenueRecognitionfromContractswithCustomers</Role>
      <ShortName>Revenue Recognition from Contracts with Customers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995310 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995311 - Disclosure - Property and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/PropertyandEquipmentNet</Role>
      <ShortName>Property and Equipment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995312 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995313 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995314 - Disclosure - Warrants</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/Warrants</Role>
      <ShortName>Warrants</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995315 - Disclosure - Mezzanine Equity and Stockholders??? Deficit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/MezzanineEquityandStockholdersDeficit</Role>
      <ShortName>Mezzanine Equity and Stockholders??? Deficit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995316 - Disclosure - Net Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/NetLossPerShare</Role>
      <ShortName>Net Loss Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995317 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/StockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995318 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995319 - Disclosure - Commitments, Contingencies, and Indemnification</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/CommitmentsContingenciesandIndemnification</Role>
      <ShortName>Commitments, Contingencies, and Indemnification</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995320 - Disclosure - Segment and Geographic Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SegmentandGeographicInformation</Role>
      <ShortName>Segment and Geographic Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995321 - Disclosure - Defined Contribution Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/DefinedContributionPlan</Role>
      <ShortName>Defined Contribution Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995322 - Disclosure - Subsequent  Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SubsequentEvents</Role>
      <ShortName>Subsequent  Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.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>24</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.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>25</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>996323 - Disclosure - Accounting Policies, by Policy (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/AccountingPoliciesbyPolicyPolicies</Role>
      <ShortName>Accounting Policies, by Policy (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>996324 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>996325 - Disclosure - Reverse Recapitalization (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/ReverseRecapitalizationTables</Role>
      <ShortName>Reverse Recapitalization (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/ReverseRecapitalization</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>996326 - Disclosure - Revenue Recognition from Contracts with Customers (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/RevenueRecognitionfromContractswithCustomersTables</Role>
      <ShortName>Revenue Recognition from Contracts with Customers (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/RevenueRecognitionfromContractswithCustomers</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>996327 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/FairValueMeasurements</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>996328 - Disclosure - Property and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/PropertyandEquipmentNetTables</Role>
      <ShortName>Property and Equipment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/PropertyandEquipmentNet</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>996329 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/Leases</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>996330 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/Debt</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>996331 - Disclosure - Warrants (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/WarrantsTables</Role>
      <ShortName>Warrants (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/Warrants</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>996332 - Disclosure - Mezzanine Equity and Stockholders??? Deficit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/MezzanineEquityandStockholdersDeficitTables</Role>
      <ShortName>Mezzanine Equity and Stockholders??? Deficit (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/MezzanineEquityandStockholdersDeficit</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>996333 - Disclosure - Net Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/NetLossPerShareTables</Role>
      <ShortName>Net Loss Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/NetLossPerShare</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>996334 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/StockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/StockBasedCompensation</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>996335 - Disclosure - Segment and Geographic Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SegmentandGeographicInformationTables</Role>
      <ShortName>Segment and Geographic Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/SegmentandGeographicInformation</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>996336 - Disclosure - Organization and Description of Business (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/OrganizationandDescriptionofBusinessDetails</Role>
      <ShortName>Organization and Description of Business (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/OrganizationandDescriptionofBusiness</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>996337 - Disclosure - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SummaryofSignificantAccountingPoliciesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/SummaryofSignificantAccountingPoliciesTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>996338 - Disclosure - Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofReconciliationofCashCashEquivalentsandRestrictedCashDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>996339 - Disclosure - Reverse Recapitalization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/ReverseRecapitalizationDetails</Role>
      <ShortName>Reverse Recapitalization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/ReverseRecapitalizationTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>996340 - Disclosure - Reverse Recapitalization - Schedule of Net Proceeds from the Merger (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/ReverseRecapitalizationScheduleofNetProceedsfromtheMergerDetails</Role>
      <ShortName>Reverse Recapitalization - Schedule of Net Proceeds from the Merger (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>996341 - Disclosure - Reverse Recapitalization - Schedule of Merger Impact of Common Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/ReverseRecapitalizationScheduleofMergerImpactofCommonStockDetails</Role>
      <ShortName>Reverse Recapitalization - Schedule of Merger Impact of Common Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>996342 - Disclosure - Revenue Recognition from Contracts with Customers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/RevenueRecognitionfromContractswithCustomersDetails</Role>
      <ShortName>Revenue Recognition from Contracts with Customers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/RevenueRecognitionfromContractswithCustomersTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>996343 - Disclosure - Revenue Recognition from Contracts with Customers - Schedule of Disaggregation of Revenue by Customer Type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/RevenueRecognitionfromContractswithCustomersScheduleofDisaggregationofRevenuebyCustomerTypeDetails</Role>
      <ShortName>Revenue Recognition from Contracts with Customers - Schedule of Disaggregation of Revenue by Customer Type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>996344 - Disclosure - Revenue Recognition from Contracts with Customers - Schedule of Contract Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/RevenueRecognitionfromContractswithCustomersScheduleofContractBalancesDetails</Role>
      <ShortName>Revenue Recognition from Contracts with Customers - Schedule of Contract Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>996345 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/FairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/FairValueMeasurementsTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>996346 - Disclosure - Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/FairValueMeasurementsScheduleofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>996347 - Disclosure - Fair Value Measurements - Schedule of Assumptions Used in Determining Fair Value of Warrant Liabilities and Convertible Promissory Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://merlin.com/20260331/role/FairValueMeasurementsScheduleofAssumptionsUsedinDeterminingFairValueofWarrantLiabilitiesandConvertiblePromissoryNotesDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Assumptions Used in Determining Fair Value of Warrant Liabilities and Convertible Promissory Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>996348 - Disclosure - Fair Value Measurements - Schedule of Company???s Fair Value Measurement Activity Using Unobservable Inputs and Associated Unrealized Losses (Gains) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/FairValueMeasurementsScheduleofCompanysFairValueMeasurementActivityUsingUnobservableInputsandAssociatedUnrealizedLossesGainsDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Company???s Fair Value Measurement Activity Using Unobservable Inputs and Associated Unrealized Losses (Gains) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>996349 - Disclosure - Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/PropertyandEquipmentNetDetails</Role>
      <ShortName>Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/PropertyandEquipmentNetTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>996350 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/PropertyandEquipmentNetScheduleofPropertyandEquipmentNetDetails</Role>
      <ShortName>Property and Equipment, Net - Schedule of Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>996351 - Disclosure - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/LeasesDetails</Role>
      <ShortName>Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/LeasesTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>996352 - Disclosure - Leases - Schedule of Components of Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/LeasesScheduleofComponentsofLeaseExpenseDetails</Role>
      <ShortName>Leases - Schedule of Components of Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996353 - Disclosure - Leases - Schedule of Future Minimum Operating Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/LeasesScheduleofFutureMinimumOperatingLeaseExpenseDetails</Role>
      <ShortName>Leases - Schedule of Future Minimum Operating Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996354 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/DebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/DebtTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996355 - Disclosure - Debt - Schedule of Outstanding Long Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/DebtScheduleofOutstandingLongTermDebtDetails</Role>
      <ShortName>Debt - Schedule of Outstanding Long Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996356 - Disclosure - Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/WarrantsDetails</Role>
      <ShortName>Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/WarrantsTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996357 - Disclosure - Warrants - Schedule of Warrants to Purchase Common Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/WarrantsScheduleofWarrantstoPurchaseCommonStockDetails</Role>
      <ShortName>Warrants - Schedule of Warrants to Purchase Common Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996358 - Disclosure - Mezzanine Equity and Stockholders??? Deficit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/MezzanineEquityandStockholdersDeficitDetails</Role>
      <ShortName>Mezzanine Equity and Stockholders??? Deficit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/MezzanineEquityandStockholdersDeficitTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996359 - Disclosure - Mezzanine Equity and Stockholders??? Defici - Schedule of Conversion Redeemable Convertible Preferred Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/MezzanineEquityandStockholdersDeficiScheduleofConversionRedeemableConvertiblePreferredStockDetails</Role>
      <ShortName>Mezzanine Equity and Stockholders??? Defici - Schedule of Conversion Redeemable Convertible Preferred Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996360 - Disclosure - Net Loss Per Share - Schedule of Basic and Diluted Net Loss Computations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/NetLossPerShareScheduleofBasicandDilutedNetLossComputationsDetails</Role>
      <ShortName>Net Loss Per Share - Schedule of Basic and Diluted Net Loss Computations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996361 - Disclosure - Net Loss Per Share - Schedule of Dilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/NetLossPerShareScheduleofDilutiveCommonStockEquivalentsExcludedfromComputationofDilutedNetLossPerShareDetails</Role>
      <ShortName>Net Loss Per Share - Schedule of Dilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996362 - Disclosure - Stock-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/StockBasedCompensationDetails</Role>
      <ShortName>Stock-Based Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/StockBasedCompensationTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996363 - Disclosure - Stock-Based Compensation - Schedule of Stock Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/StockBasedCompensationScheduleofStockOptionActivityDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Stock Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996364 - Disclosure - Stock-Based Compensation - Schedule of Fair Value of The Stock-Based Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/StockBasedCompensationScheduleofFairValueofTheStockBasedAwardsDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Fair Value of The Stock-Based Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996365 - Disclosure - Stock-Based Compensation - Schedule of Consolidated Statements of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/StockBasedCompensationScheduleofConsolidatedStatementsofOperationsDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Consolidated Statements of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996366 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/IncomeTaxes</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996367 - Disclosure - Segment and Geographic Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SegmentandGeographicInformationDetails</Role>
      <ShortName>Segment and Geographic Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/SegmentandGeographicInformationTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996368 - Disclosure - Segment and Geographic Information - Schedule of Significant Segment Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SegmentandGeographicInformationScheduleofSignificantSegmentExpensesDetails</Role>
      <ShortName>Segment and Geographic Information - Schedule of Significant Segment Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996369 - Disclosure - Segment and Geographic Information - Schedule of Information Net Sales and Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SegmentandGeographicInformationScheduleofInformationNetSalesandPropertyandEquipmentDetails</Role>
      <ShortName>Segment and Geographic Information - Schedule of Information Net Sales and Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996370 - Disclosure - Defined Contribution Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/DefinedContributionPlanDetails</Role>
      <ShortName>Defined Contribution Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://merlin.com/20260331/role/DefinedContributionPlan</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="ea0289176-10q_merlin.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996371 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://merlin.com/20260331/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</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-Q" isDefinitelyFs="true" isUsgaap="true" original="ea0289176-10q_merlin.htm">ea0289176-10q_merlin.htm</File>
    <File>mrln-20260331.xsd</File>
    <File>mrln-20260331_cal.xml</File>
    <File>mrln-20260331_def.xml</File>
    <File>mrln-20260331_lab.xml</File>
    <File>mrln-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="753">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
