<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>236</ContextCount>
  <ElementCount>281</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>61</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Unaudited Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedBalanceSheets</Role>
      <ShortName>Unaudited Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100030 - Statement - Unaudited Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Unaudited Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100040 - Statement - Unaudited Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedStatementsOfOperations</Role>
      <ShortName>Unaudited Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100050 - Statement - Unaudited Consolidated Statements of Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedStatementsOfComprehensiveLoss</Role>
      <ShortName>Unaudited Consolidated Statements of Comprehensive Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100060 - Statement - Unaudited Consolidated Statements of Comprehensive Loss (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedStatementsOfComprehensiveLossParenthetical</Role>
      <ShortName>Unaudited Consolidated Statements of Comprehensive Loss (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100070 - Statement - Unaudited Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedStatementsOfStockholdersEquity</Role>
      <ShortName>Unaudited Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100080 - Statement - Unaudited Consolidated Statements of Stockholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedStatementsOfStockholdersEquityParenthetical</Role>
      <ShortName>Unaudited Consolidated Statements of Stockholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100090 - Statement - Unaudited Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/StatementUnauditedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Unaudited Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Organization and Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndOperations</Role>
      <ShortName>Organization and Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Revenues</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureRevenues</Role>
      <ShortName>Revenues</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Net Loss per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureNetLossPerShare</Role>
      <ShortName>Net Loss per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Restricted cash</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureRestrictedCash</Role>
      <ShortName>Restricted cash</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Property and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNet</Role>
      <ShortName>Property and Equipment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Capitalized Software Development Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCapitalizedSoftwareDevelopmentCosts</Role>
      <ShortName>Capitalized Software Development Costs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Convertible Senior Notes</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureConvertibleSeniorNotes</Role>
      <ShortName>Convertible Senior Notes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Changes in Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureChangesInAccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/DisclosureIntangibleAssets1</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Stock-Based Compensation Expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationExpense</Role>
      <ShortName>Stock-Based Compensation Expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Segment Information and Geographic Data</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAndGeographicData</Role>
      <ShortName>Segment Information and Geographic Data</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Organization and Operations (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndOperationsPolicies</Role>
      <ShortName>Organization and Operations (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Net Loss per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureNetLossPerShareTables</Role>
      <ShortName>Net Loss per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureNetLossPerShare</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstruments</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Restricted cash (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureRestrictedCashTables</Role>
      <ShortName>Restricted cash (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureRestrictedCash</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Property and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNetTables</Role>
      <ShortName>Property and Equipment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNet</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Capitalized Software Development Costs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCapitalizedSoftwareDevelopmentCostsTables</Role>
      <ShortName>Capitalized Software Development Costs (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCapitalizedSoftwareDevelopmentCosts</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Convertible Senior Notes (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureConvertibleSeniorNotesTables</Role>
      <ShortName>Convertible Senior Notes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureConvertibleSeniorNotes</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureLeases</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Changes in Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureChangesInAccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureChangesInAccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Stock-Based Compensation Expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationExpenseTables</Role>
      <ShortName>Stock-Based Compensation Expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationExpense</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Segment Information and Geographic Data (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAndGeographicDataTables</Role>
      <ShortName>Segment Information and Geographic Data (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAndGeographicData</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Revenues - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureRevenuesAdditionalInformationDetail</Role>
      <ShortName>Revenues - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Revenues - Additional Information1 (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureRevenuesAdditionalInformation1Detail</Role>
      <ShortName>Revenues - Additional Information1 (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Net Loss per Share - Summary of Reconciliation of Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureNetLossPerShareSummaryOfReconciliationOfDenominatorUsedInCalculationOfBasicAndDilutedNetLossPerShareDetail</Role>
      <ShortName>Net Loss per Share - Summary of Reconciliation of Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Net Loss per Share - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureNetLossPerShareAdditionalInformationDetail</Role>
      <ShortName>Net Loss per Share - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Net Loss per Share - Schedule of Potentially Dilutive Common Stock Equivalents (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureNetLossPerShareScheduleOfPotentiallyDilutiveCommonStockEquivalentsDetail</Role>
      <ShortName>Net Loss per Share - Schedule of Potentially Dilutive Common Stock Equivalents (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Fair Value of Financial Instruments - Schedule of Fair Value of Financial Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsScheduleOfFairValueOfFinancialAssetsAndLiabilitiesDetail</Role>
      <ShortName>Fair Value of Financial Instruments - Schedule of Fair Value of Financial Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Fair Value of Financial Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Fair Value of Financial Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Fair Value of Financial Instruments - Summary of Composition of Short and Long Term Investments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfCompositionOfShortAndLongTermInvestmentsDetail</Role>
      <ShortName>Fair Value of Financial Instruments - Summary of Composition of Short and Long Term Investments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Fair Value of Financial Instruments - Summary of Contractual Maturities of Short and Long Term Investments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfContractualMaturitiesOfShortAndLongTermInvestmentsDetail</Role>
      <ShortName>Fair Value of Financial Instruments - Summary of Contractual Maturities of Short and Long Term Investments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureRestrictedCashSummaryOfReconciliationOfCashCashEquivalentsAndRestrictedCashDetail</Role>
      <ShortName>Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNetScheduleOfPropertyAndEquipmentNetDetail</Role>
      <ShortName>Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Property and Equipment, Net - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosurePropertyAndEquipmentNetAdditionalInformationDetail</Role>
      <ShortName>Property and Equipment, Net - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Capitalized Software Development Costs - Summary of Capitalized Software Development Costs, Exclusive of those Recorded within Property and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCapitalizedSoftwareDevelopmentCostsSummaryOfCapitalizedSoftwareDevelopmentCostsExclusiveOfThoseRecordedWithinPropertyAndEquipmentDetail</Role>
      <ShortName>Capitalized Software Development Costs - Summary of Capitalized Software Development Costs, Exclusive of those Recorded within Property and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Capitalized Software Development Costs - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCapitalizedSoftwareDevelopmentCostsAdditionalInformationDetail</Role>
      <ShortName>Capitalized Software Development Costs - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Convertible Senior Notes - Additional Information (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureConvertibleSeniorNotesAdditionalInformationDetail</Role>
      <ShortName>Convertible Senior Notes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Convertible Senior Notes - Schedule of Net Carrying Amount of Liability Component (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureConvertibleSeniorNotesScheduleOfNetCarryingAmountOfLiabilityComponentDetail</Role>
      <ShortName>Convertible Senior Notes - Schedule of Net Carrying Amount of Liability Component (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Convertible Senior Notes - Schedule of Interest Expense (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureConvertibleSeniorNotesScheduleOfInterestExpenseDetail</Role>
      <ShortName>Convertible Senior Notes - Schedule of Interest Expense (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Leases - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureLeasesAdditionalInformationDetail</Role>
      <ShortName>Leases - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Leases - Schedule of Operating Sublease Income Generated under Operating Lease Agreements (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureLeasesScheduleOfOperatingSubleaseIncomeGeneratedUnderOperatingLeaseAgreementsDetail</Role>
      <ShortName>Leases - Schedule of Operating Sublease Income Generated under Operating Lease Agreements (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Commitments and Contingencies - Schedule of Future Minimum Payments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesScheduleOfFutureMinimumPaymentsDetail</Role>
      <ShortName>Commitments and Contingencies - Schedule of Future Minimum Payments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Commitments and Contingencies - Schedule of Future Minimum Payments Under Non-Cancelable Arrangements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfFutureMinimumPaymentsUnderNoncancelableArrangementsDetails</Role>
      <ShortName>Commitments and Contingencies - Schedule of Future Minimum Payments Under Non-Cancelable Arrangements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureChangesInAccumulatedOtherComprehensiveLossChangesInAccumulatedOtherComprehensiveLossDetail</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Intangible Assets - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/DisclosureIntangibleAssetsAdditionalInformationDetails</Role>
      <ShortName>Intangible Assets - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Stock-Based Compensation Expense - Schedule of Stock-Based Compensation Expense by Award Type (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationExpenseScheduleOfStockBasedCompensationExpenseByAwardTypeDetail</Role>
      <ShortName>Stock-Based Compensation Expense - Schedule of Stock-Based Compensation Expense by Award Type (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Stock-Based Compensation Expense - Effect of Stock-Based Compensation on Income by Line Item (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationExpenseEffectOfStockBasedCompensationOnIncomeByLineItemDetail</Role>
      <ShortName>Stock-Based Compensation Expense - Effect of Stock-Based Compensation on Income by Line Item (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Stock-Based Compensation Expense - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureStockBasedCompensationExpenseAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation Expense - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Segment Information and Geographic Data - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAndGeographicDataAdditionalInformationDetail</Role>
      <ShortName>Segment Information and Geographic Data - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Segment Information and Geographic Data - Revenues by Geographical Region (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAndGeographicDataRevenuesByGeographicalRegionDetail</Role>
      <ShortName>Segment Information and Geographic Data - Revenues by Geographical Region (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="hubs-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Segment Information and Geographic Data - Long Lived Assets by Geographical Region (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hubspot.com/20220630/taxonomy/role/Role_DisclosureSegmentInformationAndGeographicDataLongLivedAssetsByGeographicalRegionDetail</Role>
      <ShortName>Segment Information and Geographic Data - Long Lived Assets by Geographical Region (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</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" original="hubs-20220630.htm">hubs-20220630.htm</File>
    <File>hubs-20220630.xsd</File>
    <File>hubs-20220630_cal.xml</File>
    <File>hubs-20220630_def.xml</File>
    <File>hubs-20220630_lab.xml</File>
    <File>hubs-20220630_pre.xml</File>
    <File>hubs-ex31_1.htm</File>
    <File>hubs-ex31_2.htm</File>
    <File>hubs-ex32_1.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2022</BaseTaxonomy>
    <BaseTaxonomy items="712">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
