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Senior Secured, Maturity Date March 2025, Prime + 4.70%, Floor rate 7.95%, PIK Interest 1.50%, 4.50% Exit Fee2022-12-310001280784htgc:SeptemberTwoThousandTwentySixNotesMember2023-03-310001280784Debt Investments Software and Babel Street, Senior Secured, Maturity Date December 2027, 3-month SOFR + 7.89%, Floor rate 8.89%2023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:TechnologyMember2022-12-310001280784us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784Debt Investments Drug Discovery & Development and ATAI Life Sciences N.V. Senior Secured, Maturity Date August 2026, Prime + 4.55%, Floor rate 8.55%, 6.95% Exit Fee2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:CoronadoAestheticsLLCMemberus-gaap:CommonStockMemberhtgc:MedicalDevicesAndEquipmentMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784htgc:ElectronicsComputerHardwareMember2022-12-310001280784Debt Investments Drug Discovery & Development and Axsome Therapeutics, Inc. Senior Secured, Maturity Date October 2026, Prime + 5.70%, Floor rate 8.95%, Cap rate 10.70%, 5.31% Exit Fee2022-12-310001280784Equity Investments Surgical Devices and Gynesonics, Inc., Equity, Acquisition Date 2/8/2013, Series Preferred Series D2023-03-310001280784Debt Investments Diversified Financial Services and Gibraltar Business Capital, LLC, Unsecured, Maturity Date September 2026, FIXED 14.50%2022-12-310001280784htgc:TwoThousandThirtyThreeNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001280784Investment Funds & Vehicles Investments (0.26%)2023-03-310001280784Debt Investments Healthcare Services, Other and Better Therapeutics, Inc. Senior Secured, Maturity Date August 2025, Prime + 5.70%, Floor rate 8.95%, 5.95% Exit Fee2023-03-310001280784htgc:LeaseAndLicenseObligationsMember2023-03-310001280784htgc:HerculesAdviserLLCMemberus-gaap:UnsecuredDebtMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2021-12-310001280784Debt Investments Diversified Financial Services and Gibraltar Business Capital, LLC, Unsecured, Maturity Date September 2026, FIXED 11.50%2022-12-310001280784htgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:TechnologyMember2023-03-310001280784Equity Investments Software and Docker, Inc., Equity, Acquisition Date 11/29/2018, Series Common Stock2022-12-310001280784Equity Investments Sustainable and Renewable Technology and Pivot Bio, Inc., Equity, Acquisition Date 6/28/2021, Series Preferred Series D2023-03-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:MemberUnitsMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:MacroFabIncorporationMember2022-12-310001280784Warrant Investments and Drug Discovery & Development and Evofem Biosciences, Inc., Warrant, Acquisition Date 6/11/2014, Common Stock2022-12-310001280784us-gaap:SalesRevenueNetMemberhtgc:UnsecuredMemberhtgc:CollateralTypeConcentrationRiskMember2022-01-012022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:MedicalDevicesAndEquipmentMember2023-01-012023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMember2023-03-310001280784htgc:JuneTwoThousandTwentyFiveNotesMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:TGTherapeuticsIncMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMembersrt:WeightedAverageMember2023-03-310001280784Equity Investments Consumer & Business Services and Oportun, Equity, Acquisition Date 6/28/2013, Series Common Stock2023-03-310001280784htgc:SBADebenturesIssuedOnJuneTwentyFiveTwoThousandAndTwentyOneMember2022-12-310001280784Equity Investments Sustainable and Renewable Technology and Fulcrum Bioenergy, Inc., Equity, Acquisition Date 9/13/2012, Series Preferred Series C-12023-03-310001280784Equity Investments Software and HighRoads, Inc., Equity, Acquisition Date 1/18/2013, Series Common Stock2022-12-310001280784Equity Investments Drug Discovery & Development and HilleVax, Inc, Equity, Acquisition Date 5/3/2022, Series Common Stock2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:MobileSolutionsServicesMember2022-12-310001280784us-gaap:SalesRevenueNetMemberhtgc:InvestmentTypeConcentrationRiskMemberhtgc:InvestmentFundsAndVehiclesMember2022-01-012022-12-310001280784Warrant Investments and Medical Devices & Equipment and Flowonix Medical Incorporated, Warrant, Acquisition Date 9/21/2018, Preferred Series BB2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:OtherControlInvestmentsMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:LoftwareIncMember2023-03-310001280784Warrant Investments and Biotechnology Tools and PathAI, Inc., Warrant, Acquisition Date 12/23/2022, Common Stock2022-12-310001280784Equity Investments Drug Discovery & Development and Dare Biosciences, Inc., Equity, Acquisition Date 1/8/2015, Series Common Stock2022-12-310001280784htgc:PharmaceuticalsMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberhtgc:MeasurementInputCollateralRecoverabilityMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784Debt Investments Drug Discovery & Development and Cellarity, Inc. Senior Secured, Maturity Date June 2026, Prime + 5.70%, Floor rate 8.95%, 3.75% Exit Fee2023-03-310001280784Warrant Investments and Software and Cutover, Inc., Warrant, Acquisition Date 9/21/2022, Common Stock2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:DronedeployIncorporationMember2023-03-310001280784htgc:PIKInterestMember2023-01-012023-03-310001280784htgc:SemiconductorsMember2023-03-310001280784Debt Investments Drug Discovery & Development and Eloxx Pharmaceuticals, Inc. Senior Secured, Maturity Date April 2025, Prime + 6.25%, Floor rate 9.50%, 6.55% Exit Fee2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:PreferredStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-01-012022-03-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:SeniorSecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:CytracomHoldingsLLCMember2022-12-310001280784Warrant Investments and Software and Esme Learning Solutions, Inc., Warrant, Acquisition Date 1/27/2022, Common Stock2023-03-310001280784htgc:TwoThousandThirtyThreeNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-03-310001280784htgc:MarchTwoThousandTwentySixANotesMember2023-01-012023-03-310001280784country:DE2023-03-310001280784htgc:SMBCFacilityMember2023-01-012023-03-310001280784Equity Investments Drug Discovery & Development (1.96%)2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:OmedaHoldingsLlcMember2022-12-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:SBADebenturesMember2022-12-310001280784Debt Investments Electronics & Computer Hardware (1.34%)2022-12-310001280784Equity Investments Medical Devices & Equipment and Gelesis, Inc., Equity, Acquisition Date 11/30/2009, Series Common Stock2023-03-310001280784Warrant Investments and Biotechnology Tools and PathAI, Inc., Warrant, Acquisition Date 12/23/2022, Common Stock2023-03-310001280784htgc:SeptemberTwoThousandTwentySixNotesMemberhtgc:UnusedFacilityOtherFeesMember2022-01-012022-03-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:SeniorSecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784htgc:SeniorSecuredDebtMember2023-03-310001280784Warrant Investments and Software and VideoAmp, Inc., Warrant, Acquisition Date 1/21/2022, Common Stock2022-12-310001280784htgc:PerformanceDeuMember2023-01-012023-03-310001280784Warrant Investments and Drug Discovery & Development and Provention Bio, Inc., Warrant, Acquisition Date 9/15/2022, Common Stock2023-03-310001280784htgc:March2026BNotesMember2023-03-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2023-01-012023-03-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:FebruaryTwoThousandTwentyFiveNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:HerculesAdviserLLCMemberus-gaap:UnsecuredDebtMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784Debt Investments Information Services and Capella Space Corp. Senior Secured, Maturity Date November 2025, Prime + 5.00%, Floor rate 8.25%, PIK Interest 1.10%, 7.00% Exit Fee2023-03-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel1Member2022-12-310001280784us-gaap:WarrantMemberhtgc:WarrantInvestmentMember2023-03-310001280784htgc:AdviserFundsMember2023-01-012023-03-310001280784Warrant Investments and Software and Cloudian, Inc., Warrant, Acquisition Date 11/6/2018, Common Stock2023-03-310001280784Investment Funds & Vehicles Investments and Software and Liberty Zim Co-Invest L.P., Investment Funds & Vehicles, Acquisition Date 7/21/20222023-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:GB2022-01-012022-12-310001280784htgc:PharmaceuticalsMemberhtgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMember2023-03-310001280784Equity Investments (9.56%)2022-12-310001280784us-gaap:CommonStockMember2023-03-310001280784Equity Investments Drug Delivery and PDS Biotechnology Corporation, Equity, Acquisition Date 4/6/2015, Series Common Stock2022-12-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784Debt Investments Healthcare Services, Other (13.98%)2022-12-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMemberus-gaap:MarketApproachValuationTechniqueMember2022-12-310001280784Debt Investments Drug Discovery & Development and Codiak Biosciences, Inc. Senior Secured, Maturity Date October 2025, Prime + 5.00%, Floor rate 8.25%, 5.50% Exit Fee2022-12-310001280784Warrant Investments (2.19%)2022-12-310001280784Investment Funds & Vehicles Investments and Drug Discovery & Development and Forbion Growth Opportunities Fund II C.V., Investment Funds & Vehicles, Acquisition Date 6/23/20222022-12-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:TwoThousandTwentyTwoNotesMember2022-01-012022-03-310001280784us-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:SBADebenturesMember2023-03-310001280784Debt Investments Information Services and Signal Media Limited, Senior Secured, Maturity Date June 2025, Prime + 5.50%, Floor rate 9.00%, Cap rate 12.00%, 3.45% Exit Fee2023-03-310001280784htgc:MUFGBankFacilityMember2022-12-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-12-310001280784Equity Investments Surgical Devices and Gynesonics, Inc., Equity, Acquisition Date 12/18/2018, Series Preferred Series F-12022-12-310001280784Debt Investments Software and Fortified Health Security, Senior Secured, Maturity Date December 2027, 6-month SOFR + 7.79%, Floor rate 8.54%2022-12-310001280784Equity Investments Surgical Devices, Gynesonics, Inc.2022-12-310001280784Debt Investments Drug Discovery & Development and Madrigal Pharmaceutical, Inc. Senior Secured, Maturity Date May 2026, Prime + 2.45%, Floor rate 8.25%, 5.35% Exit Fee2023-03-310001280784Equity Investments Consumer & Business Products and Grove Collaborative, Inc., Equity, Acquisition Date 4/30/2021, Series Common Stock2023-03-310001280784Debt Investments Consumer & Business Services and AppDirect, Inc. Senior Secured, Maturity Date April 2026, Prime + 5.50%, Floor rate 8.75%, 8.29% Exit Fee2022-12-310001280784htgc:February2025NotesMember2020-02-050001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-01-012023-03-310001280784Warrant Investments (2.22%)2023-03-310001280784Warrant Investments and Consumer & Business Products and The Neat Company, Warrant, Acquisition Date 8/13/2014, Common Stock2023-03-310001280784htgc:July2024NotesMember2023-03-310001280784Debt Investments Software and Cutover, Inc., Senior Secured, Maturity Date October 2025, Prime + 5.20%, Floor rate 9.95%, 4.95% Exit Fee2022-12-310001280784htgc:NotesMember2023-03-310001280784us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMember2022-01-012022-12-310001280784Debt Investments Software and Copper CRM, Inc, Senior Secured, Maturity Date March 2025, Prime + 4.50%, Floor rate 8.25%, Cap rate 10.25%, PIK Interest 1.95%, 4.50% Exit Fee2023-03-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:DebtMaturingWithinOneYearMember2023-03-310001280784Debt Investments Software and Eigen Technologies Ltd., Senior Secured, Maturity Date April 2025, Prime + 5.10%, Floor rate 8.35%, 2.95% Exit Fee2022-12-310001280784Warrant Investments and Electronics & Computer Hardware and Locus Robotics Corp., Warrant, Acquisition Date 6/21/2022, Common Stock2022-12-310001280784Equity Investments Healthcare Services, Other and 23andMe, Inc., Equity, Acquisition Date 3/11/2019, Series Common Stock2022-12-310001280784htgc:MUFGBankFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001280784Equity Investments Healthcare Services, Other and Carbon Health Technologies, Inc., Equity, Acquisition Date 3/30/2021, Series Preferred Series C2023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:CollateralTypeConcentrationRiskMemberhtgc:AllAssetsWithNegativePledgeOnIntellectualPropertyMemberhtgc:SeniorSecuredFirstLienMember2023-01-012023-03-310001280784Warrant Investments and Consumer & Business Services and Veem, Inc., Warrant, Acquisition Date 3/31/2022, Common Stock2023-03-310001280784Debt Investments Software and Constructor.io Corporation, Senior Secured, Maturity Date July 2027, 1-month SOFR + 8.44%, Floor rate 9.44%2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:PreferredStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-03-310001280784us-gaap:RestrictedStockUnitsRSUMember2022-01-012022-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMember2023-03-310001280784htgc:AppDirectIncorporationMemberhtgc:DebtInvestmentsMember2023-03-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:MarketComparableCompaniesMember2022-12-310001280784us-gaap:SalesRevenueNetMemberhtgc:CollateralTypeConcentrationRiskMemberhtgc:AllAssetsIncludingIntellectualPropertyMemberhtgc:SeniorSecuredFirstLienMember2023-01-012023-03-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:UnsecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784htgc:DebtInvestmentMember2023-01-012023-03-310001280784Debt Investments Drug Discovery & Development and G1 Therapeutics, Inc. Senior Secured, Maturity Date November 2026, Prime + 5.90%, Floor rate 9.15%, 9.86% Exit Fee2022-12-310001280784htgc:SmbcLcFacilityMember2023-01-130001280784us-gaap:CommonStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784htgc:DiversifiedFinancialServicesMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-12-310001280784Warrant Investments and Consumer & Business Services and Snagajob.com, Inc., Warrant, Acquisition Date 6/30/2016, Preferred Series A2022-12-310001280784Debt Investments Drug Discovery & Development and TG Therapeutics, Inc. Senior Secured, Maturity Date January 2026, Prime + 1.20%, Floor rate 8.95%, PIK Interest 2.25%, 5.69% Exit Fee2023-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:MarketComparableCompaniesMember2023-03-310001280784us-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Equity Investments Diversified Financial Services and Gibraltar Business Capital, LLC, Equity, Acquisition Date 3/1/2018, Series Common Stock2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:InformationServicesMember2023-01-012023-03-310001280784htgc:HealthcareServicesOtherMember2023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:CollateralTypeConcentrationRiskMember2023-01-012023-03-310001280784htgc:OmedaHoldingsLlcMemberhtgc:DebtInvestmentsMember2023-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:DE2022-01-012022-12-310001280784Debt Investments Software and Tact.ai Technologies, Inc., Senior Secured, Maturity Date February 2024, Prime + 4.00%, Floor rate 8.75%, PIK Interest 2.00%, 5.50% Exit Fee2023-03-310001280784us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784htgc:SeniorSecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:CommunicationsAndNetworkingMember2022-01-012022-12-310001280784us-gaap:RestrictedStockMemberus-gaap:CommonStockMember2022-01-012022-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMember2022-12-310001280784Warrant Investments and Consumer & Business Services and Worldremit Group Limited, Warrant, Acquisition Date 8/27/2021, Preferred Series E2023-03-310001280784htgc:DividendDeclaredSixMember2022-08-162022-08-160001280784htgc:AdviserFundsMember2022-01-012022-03-310001280784Debt Investments Consumer & Business Services and Carwow LTD Senior Secured, Maturity Date December 2024, Prime + 4.70%, Floor rate 7.95%, PIK Interest 1.45%, 4.95% Exit Fee2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:UnsecuredDebtMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-03-310001280784htgc:DiversifiedFinancialServicesMember2023-03-310001280784htgc:DebtInvestmentsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMemberhtgc:TechnologyMember2023-03-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:UnsecuredDebtOneMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-01-012023-03-310001280784us-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784Warrant Investments and Software (0.59%)2022-12-310001280784Equity Investments Sustainable and Renewable Technology and Pineapple Energy LLC, Equity, Acquisition Date 12/10/2020, Series Common Stock2022-12-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:US2023-01-012023-03-310001280784Warrant Investments and Communications & Networking and Aryaka Networks, Inc., Warrant, Acquisition Date 6/28/2022, Common Stock2022-12-310001280784htgc:PerformanceAwardsMember2022-01-012022-03-310001280784htgc:PineappleEnergyLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMemberhtgc:SeniorSecuredDebtMember2022-03-310001280784htgc:JuneTwoThousandTwentyFiveNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784Warrant Investments and Consumer & Business Services and Worldremit Group Limited, Warrant, Acquisition Date 2/11/2021, Preferred Series D2022-12-310001280784htgc:IncludingCashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784Warrant Investments and Software and Poplicus, Inc., Warrant, Acquisition Date 5/28/2014, Common Stock2023-03-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:MarchTwoThousandTwentySixANotesMember2022-01-012022-03-310001280784htgc:DebtInvestmentsMemberhtgc:AtaiLifeSciencesNVMember2022-12-310001280784Equity Investments Software and ZeroFox, Inc., Equity, Acquisition Date 5/7/2020, Series Common Stock2023-03-310001280784Debt Investments Software and Kore.ai, Inc., Senior Secured, Maturity Date April 2027, Prime + 1.50%, Floor rate 9.25%, PIK Interest 2.20%, 2.25% Exit Fee2023-03-310001280784Warrant Investments and Software and Aria Systems, Inc., Warrant, Acquisition Date 5/22/2015, Preferred Series G2022-12-310001280784Warrant Investments and Software and Delphix Corp., Warrant, Acquisition Date 10/8/2019, Common Stock2022-12-310001280784Debt Investments Healthcare Services, Other and Better Therapeutics, Inc. Senior Secured, Maturity Date August 2025, Prime + 5.70%, Floor rate 8.95%, 5.95% Exit Fee2022-12-310001280784Debt Investments Drug Discovery & Development and Axsome Therapeutics, Inc. Senior Secured, Maturity Date January 2028 Prime + 2.20%, Floor rate 9.95%, Cap rate 10.70%, 5.93% Exit Fee2023-03-310001280784us-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberhtgc:FulfilSolutionsIncMember2023-03-310001280784htgc:DividendDeclaredFourMember2022-01-012022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:CommunicationsAndNetworkingMember2023-01-012023-03-310001280784Warrant Investments and Consumer & Business Services and Lendio, Inc., Warrant, Acquisition Date 3/29/2019, Preferred Series D2022-12-310001280784Warrant Investments and Software and Brain Corporation, Warrant, Acquisition Date 10/4/2021, Common Stock2022-12-310001280784Equity Investments (8.30%)2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:CarwowLtdMember2023-03-310001280784Equity Investments Consumer & Business Services and Tectura Corporation, Equity, Acquisition Date 6/6/2016, Series Preferred Series BB2023-03-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784us-gaap:RestrictedStockMember2022-01-012022-03-310001280784Debt Investments Manufacturing Technology (2.99%)2022-12-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMember2023-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:ViridianTherapeuticsIncMember2023-03-310001280784us-gaap:IncomeApproachValuationTechniqueMemberhtgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:TechnologyMember2023-03-310001280784htgc:DividendDeclaredTwoMember2023-03-092023-03-090001280784us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-03-310001280784Equity Investments Software, Druva Holdings, Inc.2022-12-310001280784Debt Investments Drug Discovery & Development and BiomX, INC, Senior Secured, Maturity Date September 2025, Prime + 5.70%, Floor rate 8.95%, 6.55% Exit Fee2023-03-310001280784Warrant Investments and Drug Discovery & Development and Phathom Pharmaceuticals, Inc., Warrant, Acquisition Date 9/17/2021, Common Stock2023-03-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:MarchTwoThousandTwentySixANotesMember2023-01-012023-03-310001280784htgc:UnusedFacilityOtherFeesMember2022-01-012022-03-310001280784Equity Investments Software and Contentful Global, Inc., Equity, Acquisition Date 12/22/2020, Series Preferred Series C2022-12-310001280784nvestment Funds & Vehicles Investments and Software and Liberty Zim Co-Invest L.P., Investment Funds & Vehicles, Acquisition Date 7/21/20222022-12-310001280784htgc:DebtInvestmentsMemberhtgc:BabelStreetMember2023-03-310001280784Debt Investments Drug Discovery & Development and Aveo Pharmaceuticals, Inc. Senior Secured, Maturity Date September 2024, Prime + 6.40%, Floor rate 9.65%, Cap rate 15.00%, 6.95% Exit Fee2022-12-310001280784Equity Investments Diversified Financial Services and Hercules Adviser LLC, Equity, Acquisition Date 3/26/2021, Series Member Units2022-12-310001280784htgc:OneMonthLIBORMember2023-03-310001280784Warrant Investments and Electronics & Computer Hardware and Skydio, Inc., Warrant, Acquisition Date 11/08/2021, Common Stock2022-12-310001280784Equity Investments Consumer & Business Services and Total Tectura Corporation2023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:TechnologyMember2023-03-310001280784us-gaap:UnsecuredDebtMember2022-12-310001280784Equity Investments Software and SingleStore, Inc., Equity, Acquisition Date 11/25/2020, Series Preferred Series E2023-03-310001280784htgc:JanuaryTwoThousandTwentySevenNotesMember2023-03-310001280784htgc:March2026BNotesMember2021-03-040001280784htgc:IndustrySubSectorConcentrationRiskMemberhtgc:DiversifiedFinancialServicesMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784Debt Investments Consumer & Business Services and SeatGeek, Inc. Senior Secured, Maturity Date May 2026, Prime + 7.00%, Floor rate 10.50%, PIK Interest 0.50%2023-03-310001280784us-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784htgc:SBADebenturesIssuedOnJulyTwentyEightTwoThousandAndTwentyOneMember2023-03-310001280784Debt Investments Software and ThreatConnect, Inc., Senior Secured, Maturity Date May 2026, 6-month LIBOR + 9.00%, Floor rate 10.00%2022-12-310001280784htgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMember2022-12-310001280784Warrant Investments and Drug Discovery & Development and Paratek Pharmaceuticals, Inc., Warrant, Acquisition Date 8/1/2018, Common Stock2022-12-310001280784htgc:SBADebenturesIssuedOnDecemberTwentyTwoThousandAndTwentyOneMember2023-01-012023-03-310001280784htgc:UnrealizedGainLossMember2023-01-012023-03-310001280784htgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMember2022-12-310001280784Equity Investments Drug Discovery & Development and uniQure B.V., Equity, Acquisition Date 1/31/2019, Series Common Stock2023-03-310001280784htgc:HerculesCapitalFourLPMember2022-12-310001280784Warrant Investments and Consumer & Business Services and Rhino Labs, Inc., Warrant, Acquisition Date 3/12/2021, Common Stock2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:ElectronicsComputerHardwareMember2022-01-012022-12-310001280784Debt Investments Drug Discovery & Development and Century Therapeutics, Inc. Senior Secured, Maturity Date April 2024, Prime + 6.30%, Floor rate 9.55%, 3.95% Exit Fee2022-12-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:SeptemberTwoThousandTwentySixNotesMember2022-12-310001280784htgc:CommunicationsAndNetworkingMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:EnmarkSystemsIncorporationMember2022-12-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784us-gaap-supplement:InvestmentUnaffiliatedIssuerMember2022-01-012022-03-310001280784htgc:June20253YearNotesMember2022-06-230001280784country:IE2023-03-310001280784Debt Investments Drug Discovery & Development and uniQure B.V. Senior Secured, Maturity Date December 2025, Prime + 4.70%, Floor rate 7.95%, 8.03% Exit Fee2023-03-310001280784htgc:SBADebenturesIssuedOnNovemberFifteenTwoThousandAndTwentyOneMember2022-12-310001280784Debt Investments Software and Khoros (p.k.a Lithium Technologies), Senior Secured, Maturity Date January 2024, 3-month SOFR + 8.00%, Floor rate 9.00%2023-03-310001280784Equity Investments Drug Discovery & Development and uniQure B.V., Equity, Acquisition Date 1/31/2019, Series Common Stock2022-12-310001280784Debt Investments Consumer & Business Services and RVShare, LLC, Senior Secured, Maturity Date December 2026, 3-month LIBOR + 5.50%, Floor rate 6.50%, PIK Interest 4.00%2023-03-310001280784Warrant Investments and Information Services and INMOBI Inc., Warrant, Acquisition Date 11/19/2014, Common Stock2022-12-310001280784Warrant Investments and Consumer & Business Services and Provi, Warrant, Acquisition Date 12/22/2022, Common Stock2022-12-310001280784htgc:FebruaryTwoThousandTwentyFiveNotesMember2023-03-310001280784Debt Investments Drug Discovery & Development and enGene, Inc. Senior Secured, Maturity Date July 2025, Prime + 5.00%, Floor rate 8.25%, 6.35% Exit Fee2023-03-310001280784Debt Investments Sustainable and Renewable Technology and Ampion, PBC, Senior Secured, Maturity Date May 2025, Prime + 4.70%, Floor rate 7.95%, PIK Interest 1.45%, 3.95% Exit Fee2022-12-310001280784Debt Investments Drug Discovery & Development and Akero Therapeutics, Inc. Senior Secured, Maturity Date January 2027, Prime + 3.65%, Floor rate 7.65%, 5.85% Exit Fee2023-03-310001280784Debt Investments Biotechnology Tools and PathAI, Inc., Senior Secured, Maturity Date January 2027, Prime + 2.15%, Floor rate 9.15%, 11.21% Exit Fee2023-03-310001280784Warrant Investments and Sustainable and Renewable Technology and Halio, Inc.2022-12-310001280784us-gaap:UnsecuredDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-01-012022-03-310001280784us-gaap:WarrantMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMemberhtgc:ValuationTechniqueMarketAdjustedOpmBacksolveMember2022-12-310001280784Warrant Investments and Software and Eigen Technologies Ltd., Warrant, Acquisition Date 4/13/2022, Common Stock2022-12-310001280784us-gaap:RestrictedStockMemberhtgc:CapitalInExcessOfParValueMember2022-01-012022-03-310001280784us-gaap:WarrantMemberus-gaap:SalesRevenueNetMemberhtgc:InvestmentTypeConcentrationRiskMemberhtgc:WarrantInvestmentMember2023-01-012023-03-310001280784us-gaap:FairValueInputsLevel2Memberus-gaap:CommonStockMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784Warrant Investments and Software and Cloudian, Inc., Warrant, Acquisition Date 11/6/2018, Common Stock2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-03-310001280784htgc:MarchTwoThousandTwentySixANotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784us-gaap:EmployeeStockOptionMember2022-01-012022-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMember2022-01-012022-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-01-012023-03-310001280784htgc:MUFGBankFacilityMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784Equity Investments Drug Delivery and BioQ Pharma Incorporated, Equity, Acquisition Date 12/8/2015, Series Preferred Series D2022-12-310001280784Warrant Investments and Drug Discovery & Development and X4 Pharmaceuticals, Inc., Warrant, Acquisition Date 3/28/2019, Common Stock2023-03-310001280784Warrant Investments and Manufacturing Technology and Xometry, Inc., Warrant, Acquisition Date 5/9/2018, Common Stock2022-12-310001280784Debt Investments Drug Discovery & Development and Redshift Bioanalytics, Inc. Senior Secured, Maturity Date January 2026, Prime + 4.25%, Floor rate 7.50%, 3.80% Exit Fee2022-12-310001280784htgc:CoronadoAestheticsLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:PreferredStockMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784us-gaap:CreditConcentrationRiskMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:GritstoneBioIncMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:PreferredSeriesBBMemberhtgc:TecturaCorporationMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:SkydioIncorporationMember2023-03-310001280784Debt Investments Software and Agilence, Inc. Senior Secured, Maturity Date October 2026, 1-month BSBY + 9.00%, Floor rate 10.00%2022-12-310001280784Equity Investments Drug Discovery & Development and X4 Pharmaceuticals, Inc., Equity, Acquisition Date 11/26/2019, Series Common Stock2022-12-310001280784us-gaap:SalesRevenueNetMemberhtgc:UnsecuredMemberhtgc:CollateralTypeConcentrationRiskMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberhtgc:DemandbaseIncorporationMember2023-03-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:SeptemberTwoThousandTwentySixNotesMember2023-03-310001280784us-gaap:IncomeApproachValuationTechniqueMemberhtgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMember2023-03-310001280784Debt Investments Software and Simon Data, Inc., Senior Secured, Maturity Date March 2027, Prime + 1.00%, Floor rate 8.75%, PIK Interest 1.95%, 2.95% Exit Fee2023-03-310001280784htgc:SBADebenturesIssuedOnNovemberFifteenTwoThousandAndTwentyOneMember2023-01-012023-03-310001280784country:DK2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:RivieraPartnersLLCMember2022-12-310001280784us-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310001280784Warrant Investments and Sustainable and Renewable Technology and Ampion, PBC, Warrant, Acquisition Date 4/15/2022, Common Stock2022-12-310001280784Debt Investments Drug Discovery & Development and Bicycle Therapeutics PLC, Senior Secured, Maturity Date July 2025, Prime + 4.55%, Floor rate 8.05%, Cap rate 9.05%, 5.00% Exit Fee2022-12-310001280784htgc:PharmaceuticalsMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberhtgc:MeasurementInputCollateralRecoverabilityMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784htgc:IncludingCashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784Investments after Cash and Cash Equivalents (209.82%)2023-03-310001280784htgc:OneMonthSofrRateMember2023-03-310001280784Equity Investments and Drug Discovery & Development and Dare Biosciences, Inc., Equity, Acquisition Date 1/8/2015, Series Common Stock2023-03-310001280784Debt Investments Software and Constructor Corporation, Senior Secured, Maturity Date July 2027, 1-month SOFR + 8.44%, Floor rate 9.44%2023-03-310001280784country:IL2023-03-310001280784Equity Investments Drug Delivery and AcelRx Pharmaceuticals, Inc., Equity, Acquisition Date 12/10/2018, Series Common Stock2023-03-310001280784Equity Investments Information Services and Yipit, LLC, Equity, Acquisition Date 12/30/2021, Series Preferred Series E2023-03-310001280784htgc:TwoThousandThirtyThreeNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:SemiconductorsMember2023-01-012023-03-310001280784htgc:DepreciationMemberus-gaap:FairValueInputsLevel3Memberhtgc:WarrantInvestmentMember2023-01-012023-03-310001280784Warrant Investments and Consumer & Business Products (0.17%)2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:CerosIncorporationMember2022-12-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:UnsecuredDebtOneMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-01-012022-12-310001280784Warrant Investments and Medical Devices & Equipment and Intuity Medical, Inc., Warrant, Acquisition Date 12/29/2017, Preferred Series B-12023-03-310001280784Debt Investments Consumer & Business Services and SeatGeek, Inc. Senior Secured, Maturity Date June 2023, Prime + 5.00%, Floor rate 10.50%, PIK Interest 0.50%2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:InformationServicesMember2022-01-012022-12-310001280784Equity Investments Drug Discovery & Development and Tricida, Inc., Equity, Acquisition Date 2/28/2018, Series Common Stock2023-03-310001280784Warrant Investments and Manufacturing Technology (0.30%)2022-12-310001280784Cash & Cash Equivalents and GS Financial Square Government Fund, Cash & Cash Equivalents2023-03-310001280784htgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMember2023-03-310001280784Debt Investments Healthcare Services, Other and Equality Health, LLC, Senior Secured, Maturity Date February 2026, Prime + 6.25%, Floor rate 9.50%, PIK Interest 1.55%2023-03-310001280784htgc:HealthcareServicesOtherMemberhtgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMember2022-01-012022-12-310001280784us-gaap:FairValueInputsLevel1Memberus-gaap:CommonStockMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784us-gaap:FairValueInputsLevel1Memberus-gaap:CommonStockMember2022-12-310001280784Warrant Investments and Consumer & Business Services and Thumbtack, Inc., Warrant, Acquisition Date 5/1/2018, Common Stock2023-03-310001280784Debt Investments Drug Discovery & Development and Locus Biosciences, Inc. Senior Secured, Maturity Date July 2025, Prime + 6.10%, Floor rate 9.35%, 4.95% Exit Fee2022-12-310001280784Equity Investments Consumer & Business Services and Total OfferUp, Inc.2023-03-310001280784Equity Investments Drug Discovery & Development and HilleVax, Inc, Equity, Acquisition Date 5/3/2022, Series Common Stock2022-12-310001280784htgc:DividendDeclaredOneMember2022-01-012022-12-310001280784us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001280784us-gaap:UnsecuredDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784Equity Investments Drug Delivery and Aytu BioScience, Inc., Equity, Acquisition Date 3/28/2014, Series Common Stock2023-03-310001280784htgc:LeaseAndLicenseObligationsMember2022-12-310001280784us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Warrant Investments and Consumer & Business Services and Vida Health, Inc., Warrant, Acquisition Date 3/28/2022, Common Stock2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtTwoMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-12-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:JuneTwoThousandTwentyFiveThreeYearNotesMember2023-03-310001280784htgc:SMBCFacilityMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Warrant Investments and Consumer & Business Services (0.19%)2022-12-310001280784Warrant Investments and Drug Discovery & Development and Valo Health, LLC, Warrant, Acquisition Date 6/15/2020, Common Units2023-03-310001280784htgc:DeferredFeesMember2022-01-012022-12-310001280784Debt Investments Software and Leapwork ApS., Senior Secured, Maturity Date February 2026, Prime + 0.25%, Floor rate 7.25%, PIK Interest 1.95%, 2.70% Exit Fee2023-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784Warrant Investments and Drug Discovery & Development and Fresh Tracks Therapeutics, Inc. (p.k.a. Brickell Biotech, Inc.), Warrant, Acquisition Date 2/18/2016, Common Stock2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:CutoverIncMember2023-03-310001280784Warrant Investments and Consumer & Business Services and Snagajob.com, Inc., Warrant, Acquisition Date 6/30/2016, Preferred Series A2023-03-310001280784Investment Funds & Vehicles Investments and Drug Discovery & Development (0.25%)2022-12-310001280784htgc:CommonStockInvestmentMemberus-gaap:FairValueInputsLevel3Memberhtgc:AppreciationMember2022-01-012022-03-310001280784htgc:DebtInvestmentsMemberhtgc:LeapworkApsMember2023-03-310001280784htgc:HerculesAdviserLLCMemberus-gaap:UnsecuredDebtMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2022-03-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2022-01-012022-03-310001280784Equity Investments Semiconductors (0.01%)2022-12-310001280784Equity Investments Consumer & Business Products and TechStyle, Inc., Equity, Acquisition Date 4/30/2010, Series Common Stock2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-03-310001280784Debt Investments Drug Discovery & Development and Valo Health, LLC, Senior Secured, Maturity Date May 2024, Prime + 6.45%, Floor rate 9.70%, 3.85% Exit Fee2022-12-310001280784htgc:UnvestedRestrictedStockAwardsMember2023-01-012023-03-310001280784Equity Investments Drug Discovery & Development and Valo Health, LLC, Equity, Acquisition Date 10/31/2022, Series Preferred Series C2023-03-310001280784htgc:June20253YearNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2022-01-012022-03-310001280784Warrant Investments and Drug Delivery and Aerami Therapeutics Holdings, Inc., Warrant, Acquisition Date 9/30/2015, Common Stock2022-12-310001280784htgc:SMBCFacilityMembersrt:MaximumMember2023-01-012023-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMember2023-03-310001280784htgc:February2025NotesMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CostApproachValuationTechniqueMember2022-12-310001280784htgc:SixMonthSofrRateMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:YipitLLCMember2023-03-310001280784Equity Investments Diversified Financial Services and Gibraltar Business Capital, LLC, Equity, Acquisition Date 3/1/2018, Series Preferred Series A2023-03-310001280784htgc:CommonGrossProceedsMember2022-01-012022-03-310001280784Warrant Investments and Drug Delivery and Aerami Therapeutics Holdings, Inc., Warrant, Acquisition Date 9/30/2015, Common Stock2023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:InvestmentTypeConcentrationRiskMemberhtgc:InvestmentFundsAndVehiclesMember2023-01-012023-03-310001280784Debt Investments Software and Esme Learning Solutions, Inc., Senior Secured, Maturity Date February 2025, Prime + 5.50%, Floor rate 8.75%, PIK Interest 1.50%, 3.00% Exit Fee2022-12-310001280784us-gaap:WarrantMemberhtgc:WarrantInvestmentMember2022-12-310001280784us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMembersrt:WeightedAverageMemberhtgc:ValuationTechniqueMarketAdjustedOpmBacksolveMember2022-12-310001280784Debt Investments Software and Omeda Holdings, LLC, Senior Secured, Maturity Date July 2027, 3-month SOFR + 8.05%, Floor rate 9.05%2023-03-310001280784Debt Investments Software and Dispatch Technologies, Inc., Senior Secured, Maturity Date April 2028, 3-month SOFR + 8.01%, Floor rate 8.76%2023-03-310001280784Debt Investments Healthcare Services, Other and Carbon Health Technologies, Inc. Senior Secured, Maturity Date March 2025, Prime + 5.60%, Floor rate 8.85%, 4.61% Exit Fee2023-03-310001280784Warrant Investments and Medical Devices & Equipment and Tela Bio, Inc., Warrant, Acquisition Date 3/31/2017, Common Stock2023-03-310001280784us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784Debt Investments Software and 3GTMS, LLC, Senior Secured, Maturity Date February 2025, 3-month LIBOR + 9.27%, Floor rate 10.27%2023-03-310001280784htgc:MUFGBankFacilityMember2022-12-310001280784Debt Investments Drug Discovery & Development and Alladapt Immunotherapeutics Inc. Senior Secured, Maturity Date September 2026, Prime + 3.65%, Floor rate 8.40%, Cap rate 10.90%, 9.09% Exit Fee2023-03-310001280784Warrant Investments and Software and SignPost, Inc., Warrant, Acquisition Date 1/13/2016, Series Junior 1 Preferred2022-12-310001280784Debt Investments Drug Discovery & Development and Iveric Bio, Inc. Senior Secured, Maturity Date August 2027, Prime + 4.00%, Floor rate 8.75%, Cap rate 10.25%, 4.25% Exit Fee2023-03-310001280784Debt Investments Software and Agilence, Inc. Senior Secured, Maturity Date October 2026, 1-month BSBY + 9.00%, Floor rate 10.00%2023-03-310001280784htgc:ConsumerAndBusinessServicesMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:MacroFabIncorporationMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:ZimperiumIncMember2022-12-310001280784Debt Investments Consumer & Business Services and Tectura Corporation, Senior Secured, Maturity Date July 2024, FIXED 8.25%2022-12-3100012807842022-03-090001280784Debt Investments Drug Discovery & Development and Nabriva Therapeutics, Senior Secured, Maturity Date June 2023, Prime + 4.30%, Floor rate 9.80%, 9.95% Exit Fee2022-12-310001280784us-gaap:UnsecuredDebtMember2023-03-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMembersrt:WeightedAverageMember2022-12-310001280784Equity Investments Electronics & Computer Hardware and Locus Robotics Corp., Equity, Acquisition Date 11/17/2022, Series Preferred Series F2023-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMember2022-12-310001280784Warrant Investments and Sustainable and Renewable Technology and Polyera Corporation, Warrant, Acquisition Date 3/24/2015, Preferred Series C2023-03-310001280784htgc:JulyTwoThousandTwentyFourNotesMemberhtgc:UnusedFacilityOtherFeesMember2023-01-012023-03-310001280784htgc:JanuaryTwoThousandTwentySevenNotesMemberhtgc:UnusedFacilityOtherFeesMember2022-01-012022-03-310001280784htgc:DebtInvestmentsMemberhtgc:AlamarBiosciencesIncorporationMember2022-12-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMemberus-gaap:MemberUnitsMember2022-03-310001280784htgc:SeniorSecuredDebtOneMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-01-012023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2022-03-310001280784htgc:DebtInvestmentsMemberhtgc:PhathomPharmaceuticalsIncMember2023-03-310001280784Debt Investments Software and VideoAmp, Inc., Senior Secured, Maturity Date February 2025, Prime + 3.70%, Floor rate 6.95%, PIK Interest 1.25%, 5.25% Exit Fee2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2022-12-310001280784Warrant Investments and Manufacturing Technology and Bright Machines, Inc., Warrant, Acquisition Date 3/31/2022, Common Stock2023-03-310001280784us-gaap:SubsequentEventMemberhtgc:SupplementalDividendMember2023-05-230001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:CoronadoAestheticsLLCMemberus-gaap:CommonStockMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784htgc:SBADebenturesIssuedOnNovemberThirtyTwoThousandAndTwentyOneMember2023-03-310001280784htgc:PineappleEnergyLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMember2022-03-310001280784htgc:DebtInvestmentsMemberhtgc:KuraOncologyIncMember2023-03-310001280784htgc:SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2021-12-310001280784Equity Investments Consumer & Business Services and Total Tectura Corporation2022-12-310001280784Debt Investments Drug Discovery & Development and Viridian Therapeutics, Inc. Senior Secured, Maturity Date October 2026, Prime + 4.20%, Floor rate 7.45%, Cap rate 8.95%, 4.76% Exit Fee2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:HilleVaxIncMember2023-03-310001280784Debt Investments Software and Ceros, Inc., Senior Secured, Maturity Date September 2026, 6-month LIBOR + 8.89%, Floor rate 9.89%2023-03-310001280784Equity Investments Software and Contentful Global, Inc., Equity, Acquisition Date 11/20/2018, Series Preferred Series D2023-03-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:MarketComparableCompaniesMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:SkydioIncorporationMember2022-12-310001280784htgc:PineappleEnergyLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMemberhtgc:SeniorSecuredDebtMember2022-01-012022-03-310001280784Warrant Investments and Manufacturing Technology and Bright Machines, Inc., Warrant, Acquisition Date 3/31/2022, Common Stock2022-12-310001280784Debt Investments Software and Zimperium, Inc., Senior Secured, Maturity Date May 2027, 3-month SOFR + 8.31%, Floor rate 9.31%2022-12-310001280784htgc:DeferredFeesMember2023-01-012023-03-310001280784Warrant Investments and Electronics & Computer Hardware and 908 Devices, Inc., Warrant, Acquisition Date 3/15/2017, Common Stock2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:FlightScheduleProLlcMember2022-12-310001280784Warrant Investments and Software and Demandbase, Inc., Warrant, Acquisition Date 8/2/2021, Common Stock2022-12-310001280784htgc:ControlAndAffiliateInvestmentsMember2022-03-310001280784Warrant Investments and Software and Evernote Corporation, Warrant, Acquisition Date 9/30/2016, Common Stock2022-12-310001280784htgc:HerculesCapitalFourLPMember2020-10-270001280784htgc:StreamlineHealthcareSolutionsMemberhtgc:DebtInvestmentsMember2022-12-310001280784Debt Investments Software and 3GTMS, LLC, Senior Secured, Maturity Date February 2025, 3-month LIBOR + 9.28%, Floor rate 10.28%2022-12-310001280784htgc:SBADebenturesIssuedOnDecemberTwentyTwoThousandAndTwentyOneMember2023-03-310001280784Investments in Securities (208.56%)2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-12-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784Equity Investments Drug Discovery & Development and Tricida, Inc., Equity, Acquisition Date 2/28/2018, Series Common Stock2022-12-310001280784htgc:ForbionGrowthOpportunitiesFundICVMemberhtgc:InvestmentFundsAndVehiclesMember2022-12-310001280784Equity Investments Consumer & Business Services and Tectura Corporation, Acquisition Date 5/23/2018, Series Common Stock2022-12-310001280784htgc:ThreeGTMSLLCMemberhtgc:DebtInvestmentsMember2023-03-310001280784us-gaap:RestrictedStockMemberhtgc:DirectorPlanMember2018-06-280001280784htgc:DebtInvestmentsMemberhtgc:AlchemerLLCMember2023-03-310001280784Warrant Investments and Drug Discovery & Development and Scynexis, Inc., Warrant, Acquisition Date 5/14/2021, Common Stock2022-12-310001280784Debt Investments Consumer & Business Services and Collective Health, Inc.Senior Secured, Maturity Date September 2023, Prime + 4.75%, Floor rate 12.50%2023-03-310001280784Equity Investments Medical Devices & Equipment and Coronado Aesthetics, LLC, Equity, Acquisition Date 10/15/2021, Series Common Units2022-12-310001280784Debt Investments Sustainable and Renewable Technology (0.50%)2022-12-310001280784us-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:SBADebenturesMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMember2022-12-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:UnsecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784Warrant Investments and Drug Discovery & Development and Akero Therapeutics, Inc., Warrant, Acquisition Date 6/15/2022, Common Stock2023-03-310001280784us-gaap:FairValueInputsLevel1Memberus-gaap:CommonStockMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784Equity Investments Healthcare Services, Other (0.21%)2022-12-310001280784Warrant Investments and Software and Fulfil Solutions, Inc., Warrant, Acquisition Date 7/29/2022, Common Stock2023-03-310001280784htgc:MUFGBankFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-03-310001280784htgc:SustainableAndRenewableTechnologyMember2023-03-310001280784Debt Investments Software and 3GTMS, LLC, Senior Secured, Maturity Date February 2025, 3-month LIBOR + 6.57%, Floor rate 7.57%2022-12-310001280784htgc:LastOutWithSecurityInterestInAllOfTheAssetsMemberus-gaap:SalesRevenueNetMemberhtgc:CollateralTypeConcentrationRiskMemberhtgc:SeniorSecuredFirstLienMember2022-01-012022-12-310001280784Equity Investments Software and Palantir Technologies, Equity, Acquisition Date 9/23/2020, Series Common Stock2023-03-310001280784Debt Investments Drug Discovery & Development and Aldeyra Therapeutics, Inc. Senior Secured, Maturity Date October 2024, Prime + 3.10%, Floor rate 8.60%, 8.90% Exit Fee2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:CoronadoAestheticsLLCMemberus-gaap:PreferredStockMemberhtgc:MajorityOwnedControlInvestmentsMember2022-03-310001280784Equity Investments Diversified Financial Services (2.49%)2022-12-310001280784Equity Investments Information Services and Zeta Global Corp., Equity, Acquisition Date 11/20/2007, Series Common Stock2022-12-310001280784Equity Investments Software and HighRoads, Inc., Equity, Acquisition Date 1/18/2013, Series Common Stock2023-03-310001280784Debt Investments Drug Discovery & Development and Corium, Inc. Senior Secured, Maturity Date September 2026, Prime + 5.70%, Floor rate 8.95%, 7.75% Exit Fee2022-12-310001280784Warrant Investments and Drug Discovery & Development and enGene, Inc., Warrant, Acquisition Date 12/30/2021, Preferred Series 32023-03-310001280784htgc:LiabilityClassifiedAwardsMember2023-01-012023-03-310001280784Warrant Investments and Drug Delivery (0.00%)2023-03-310001280784us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784us-gaap:CommonStockMember2021-12-310001280784us-gaap:SubsequentEventMemberhtgc:SupplementalDividendMember2022-03-092023-04-270001280784us-gaap:PreferredStockMemberhtgc:EquityInvestmentsMember2022-12-310001280784Equity Investments Diversified Financial Services and Newfront Insurance Holdings, Inc., Equity, Acquisition Date 9/30/2021, Series Preferred Series D-22022-12-310001280784Equity Investments Software and SingleStore, Inc., Equity, Acquisition Date 8/12/2021, Series Preferred Series F2022-12-310001280784Warrant Investments and Software and The Faction Group LLC, Warrant, Acquisition Date 11/3/2014, Preferred Series AA2023-03-310001280784country:IE2022-12-310001280784Debt Investments Software and 3GTMS, LLC2022-12-310001280784htgc:DividendDeclaredThreeMember2022-05-242022-05-240001280784htgc:JuneTwoThousandTwentyFiveNotesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784Debt Investments Sustainable and Renewable Technology and Ampion, PBC, Senior Secured, Maturity Date May 2025, Prime + 4.70%, Floor rate 7.95%, PIK Interest 1.45%, 3.95% Exit Fee2023-03-310001280784Warrant Investments and Software (0.64%)2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:AlladaptImmunotherapeuticsincMember2022-12-310001280784us-gaap:PreferredStockMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784Debt Investments Drug Discovery & Development and Replimune Group, Inc. Senior Secured, Maturity Date October 2027, Prime + 1.75%, Floor rate 7.25%, Cap rate 9.00%, PIK Interest 1.50%, 4.95% Exit Fee2023-03-310001280784htgc:JulyTwoThousandTwentyFourNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001280784htgc:MediaContentInfoMember2023-03-310001280784htgc:SMBCFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001280784us-gaap:WarrantMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784htgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMember2023-03-310001280784Debt Investments Drug Discovery & Development and Eloxx Pharmaceuticals, Inc. Senior Secured, Maturity Date April 2025, Prime + 6.25%, Floor rate 9.50%, 6.55% Exit Fee2022-12-310001280784htgc:PerformanceVestingAwardsMember2023-01-012023-03-310001280784Warrant Investments and Information Services (0.03%)2023-03-310001280784Debt Investments Information Services and Signal Media Limited, Senior Secured, Maturity Date June 2025, Prime + 5.50%, Floor rate 9.00%, Cap rate 12.00%, 3.45% Exit Fee2022-12-310001280784Equity Investments Drug Discovery & Development and Bicycle Therapeutics PLC, Equity, Acquisition Date 10/5/2020, Series Common Stock2022-12-310001280784htgc:June20253YearNotesMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMemberhtgc:BlackCrowAIIncMember2022-03-310001280784Equity Investments Medical Devices & Equipment, Coronado Aesthetics, LLC2023-03-310001280784Equity Investments Semiconductors (0.02%)2023-03-310001280784Debt Investments Consumer & Business Services and SeatGeek, Inc. Senior Secured, Maturity Date June 2023, Prime + 5.00%, Floor rate 10.50%, PIK Interest 0.50%2023-03-310001280784Debt Investments Drug Discovery & Development and Geron Corporation, Senior Secured, Maturity Date April 2025, Prime + 5.75%, Floor rate 9.00%, 6.55% Exit Fee2023-03-310001280784Equity Investments Surgical Devices and TransMedics Group, Inc., Equity, Acquisition Date 11/7/2012, Series Common Stock2023-03-310001280784Equity Investments Medical Devices & Equipment (0.04%)2023-03-310001280784htgc:CapitalInExcessOfParValueMember2021-12-310001280784Equity Investments Electronics & Computer Hardware and Skydio, Inc., Equity, Acquisition Date 3/8/2022, Series Preferred Series E2023-03-310001280784Equity Investments Consumer & Business Services and OfferUp, Inc., Equity, Acquisition Date 10/25/2016, Series Preferred Series A-12022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784htgc:SixMonthLIBORMember2022-12-310001280784Debt Investments Healthcare Services, Other and Carbon Health Technologies, Inc. Senior Secured, Maturity Date March 2025, Prime + 5.60%, Floor rate 8.85%, 4.61% Exit Fee2022-12-310001280784Debt Investments Healthcare Services, Other and Blue Sprig Pediatrics, Inc. Senior Secured, Maturity Date November 2026, 3-month LIBOR + 5.00%, Floor rate 6.00%, PIK Interest 4.45%2023-03-310001280784Warrant Investments and Consumer & Business Services and Skyword, Inc., Warrant, Acquisition Date 8/23/2019, Preferred Series B2023-03-310001280784htgc:ConsumerAndBusinessServicesMember2022-12-310001280784htgc:JanuaryTwoThousandTwentySevenNotesMember2023-01-012023-03-310001280784htgc:PineappleEnergyLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:CommonStockMember2021-12-310001280784Warrant Investments and Software and Demandbase, Inc., Warrant, Acquisition Date 8/2/2021, Common Stock2023-03-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:TwoThousandThirtyOneAssetBackedNotesMember2022-12-310001280784Debt Investments Software (54.28%)2022-12-310001280784htgc:AdviserFundsMember2022-12-310001280784Equity Investments Consumer & Business Services and Tectura Corporation, Equity, Acquisition Date 6/6/2016, Series Preferred Series BB2022-12-310001280784htgc:June20253YearNotesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Warrant Investments and Consumer & Business Products and TFG Holding, Inc., Warrant, Acquisition Date 6/27/2014, Common Stock2023-03-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:SeniorSecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2022-01-012022-03-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMember2023-03-310001280784htgc:March2026BNotesMember2021-03-042021-03-040001280784Warrant Investments and Medical Devices & Equipment and Flowonix Medical Incorporated2023-03-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-01-012022-03-310001280784htgc:SMBCFacilityMembersrt:MaximumMember2023-03-310001280784Warrant Investments and Software and Bitsight Technologies, Inc., Warrant, Acquisition Date 11/18/2020, Common Stock2023-03-310001280784us-gaap:FairValueInputsLevel2Memberhtgc:TwoThousandThirtyThreeNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784us-gaap:RestrictedStockUnitsRSUMember2023-01-012023-03-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:ConsumerAndBusinessProductsMember2022-01-012022-12-310001280784us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:MarketComparableCompaniesMember2023-03-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784Equity Investments Drug Discovery & Development and NorthSea Therapeutics, Equity, Acquisition Date 12/15/2021, Series Preferred Series C2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:TipaltiSolutionsLtdMember2023-03-310001280784Debt Investments Diversified Financial Services and Next Insurance, Inc, Senior Secured, Maturity Date February 2028, Prime + -1.50%, Floor rate 4.75%, PIK Interest 5.50%2023-03-310001280784us-gaap:SalesRevenueNetMemberus-gaap:UnsecuredDebtMemberhtgc:InvestmentTypeConcentrationRiskMember2023-01-012023-03-310001280784Equity Investments Software and Contentful Global, Inc., Equity, Acquisition Date 12/22/2020, Series Preferred Series C2023-03-310001280784Equity Investments Drug Discovery & Development and Rocket Pharmaceuticals, Ltd., Equity, Acquisition Date 8/22/2007, Series Common Stock2023-03-310001280784htgc:OtherMember2023-03-310001280784Debt Investments Electronics & Computer Hardware and Locus Robotics Corp. Senior Secured, Maturity Date June 2026, Prime + 4.50%, Floor rate 8.00%, 1.00% Exit Fee2023-03-310001280784us-gaap:WarrantMemberus-gaap:SalesRevenueNetMemberhtgc:InvestmentTypeConcentrationRiskMemberhtgc:WarrantInvestmentMember2022-01-012022-12-310001280784htgc:DebtInvestmentsMemberhtgc:DispatchTechnologiesIncMember2022-12-310001280784us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueOtherMember2023-03-310001280784Debt Investments Software and ThreatConnect, Inc., Senior Secured, Maturity Date May 2026, 6-month LIBOR + 9.00%, Floor rate 10.00%2023-03-310001280784Equity Investments Information Services and Planet Labs, Inc., Equity, Acquisition Date 6/21/2019, Series Common Stock2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784htgc:June2025NotesMember2023-01-012023-03-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMember2022-12-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputHypotheticalMarketYieldMemberhtgc:ValuationTechniqueMarketComparableCompaniesMember2022-12-310001280784Warrant Investments and Sustainable and Renewable Technology and Polyera Corporation, Warrant, Acquisition Date 3/24/2015, Preferred Series C2022-12-310001280784us-gaap:FairValueInputsLevel1Memberus-gaap:CommonStockMember2023-03-310001280784htgc:January2027NotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Debt Investments Software and Cybermaxx Intermediate Holdings, Inc.2023-03-310001280784htgc:ExitFeesAmortizationMember2023-01-012023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMemberhtgc:TechnologyMember2022-12-310001280784Warrant Investments and Information Services and INMOBI Inc., Warrant, Acquisition Date 11/19/2014, Common Stock2023-03-310001280784htgc:MUFGBankFacilityMember2023-01-012023-03-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784htgc:KhorosPKLithiumTechnologiesMemberhtgc:DebtInvestmentsMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-01-012022-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784htgc:ControlInvestmentsMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2022-01-012022-03-310001280784Warrant Investments and Drug Discovery & Development and Dermavant Sciences Ltd., Warrant, Acquisition Date 5/31/2019, Common Stock2022-12-310001280784htgc:ControlInvestmentsMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMember2023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:CollateralTypeConcentrationRiskMemberhtgc:AllAssetsWithNegativePledgeOnIntellectualPropertyMemberhtgc:SeniorSecuredFirstLienMember2022-01-012022-12-310001280784htgc:DebtInvestmentsMemberhtgc:AxsomeTherapeuticsIncMember2022-12-310001280784htgc:JuneTwoThousandTwentyFiveThreeYearNotesMember2022-12-310001280784Debt Investments Drug Discovery & Development and Scynexis, Inc. Senior Secured, Maturity Date March 2025, Prime + 5.80%, Floor rate 9.05%, 3.95% Exit Fee2023-03-310001280784Debt Investments Healthcare Services, Other and Oak Street Health, Inc. Senior Secured, Maturity Date October 2027, Prime + 2.45%, Floor rate 7.95%, Cap rate 9.45%, PIK Interest 1.00%, 4.95% Exit Fee2023-03-310001280784Debt Investments Drug Discovery & Development and Finch Therapeutics Group, Inc. Senior Secured, Maturity Date November 2026, Prime + 4.05%, Floor rate 7.55%, Cap rate 8.80%, 5.50% Exit Fee2022-12-310001280784htgc:BiotechnologyToolsMember2023-03-310001280784htgc:SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember2022-12-310001280784Warrant Investments and Manufacturing Technology and Xometry, Inc., Warrant, Acquisition Date 5/9/2018, Common Stock2023-03-310001280784htgc:GeographicLocationMember2023-01-012023-03-310001280784htgc:OtherMember2022-12-310001280784htgc:PerformanceVestingAwardsMember2023-03-310001280784us-gaap:SubsequentEventMemberhtgc:SupplementalDividendMember2023-05-232023-05-230001280784Debt Investments Communications & Networking (7.26%)2022-12-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:FebruaryTwoThousandTwentyFiveNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784Warrant Investments and Manufacturing Technology and MacroFab, Inc., Warrant, Acquisition Date 3/23/2022, Common Stock2023-03-310001280784htgc:DebtInvestmentMember2022-01-012022-03-310001280784Warrant Investments and Software and DroneDeploy, Inc., Warrant, Acquisition Date 6/30/2022, Common Stock2022-12-310001280784htgc:ZappiIncMemberhtgc:DebtInvestmentsMember2023-03-310001280784Debt Investments Drug Discovery & Development and Alladapt Immunotherapeutics Inc. Senior Secured, Maturity Date September 2026, Prime + 3.65%, Floor rate 8.40%, Cap rate 10.90%, 10.60% Exit Fee2022-12-310001280784htgc:June20253YearNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784Equity Investments Information Services (0.40%)2023-03-310001280784Warrant Investments and Software and SingleStore, Inc., Warrant, Acquisition Date 4/28/2020, Preferred Series D2022-12-310001280784Debt Investments Software and ShadowDragon, LLC, Senior Secured, Maturity Date December 2026, 3-month LIBOR + 9.00%, Floor rate 10.00%2022-12-310001280784htgc:SeptemberTwoThousandTwentySixNotesMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-03-310001280784htgc:SecurityTypeMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:YipitLLCMember2022-12-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:MarchTwoThousandTwentySixANotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784Warrant Investments and Software and Mixpanel, Inc., Warrant, Acquisition Date 9/30/2020, Common Stock2022-12-310001280784Equity Investments Diversified Financial Services, Gibraltar Business Capital, LLC2023-03-310001280784us-gaap:CommonStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-01-012022-03-310001280784us-gaap:UnsecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:DebtInvestmentsImminentPayoffsMember2023-03-310001280784htgc:JulyTwoThousandTwentyFourNotesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784us-gaap:PreferredStockMemberus-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMemberhtgc:BlackCrowAIIncMember2022-01-012022-03-310001280784Warrant Investments and Drug Discovery & Development and AmplifyBio, LLC, Warrant, Acquisition Date 12/27/2022, Class A Units2022-12-310001280784Warrant Investments and Drug Discovery & Development and Phathom Pharmaceuticals, Inc., Warrant, Acquisition Date 9/17/2021, Common Stock2022-12-310001280784htgc:SBADebenturesMember2022-01-012022-03-310001280784us-gaap:CommonStockMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784htgc:TwoThousandThirtyThreeNotesMember2023-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMembersrt:WeightedAverageMember2023-03-310001280784us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784htgc:JuneTwoThousandTwentyFiveNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784country:IEus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784htgc:SBADebenturesIssuedOnJanuaryFourteenTwoThousandAndTwentyTwoMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:AkeroTherapeuticsIncMember2022-12-310001280784htgc:AdviserSubsidiaryMember2023-01-012023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-01-012023-03-310001280784htgc:EscrowReceivableMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784htgc:JanuaryTwoThousandTwentySevenNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784Equity Investments Software and SingleStore, Inc., Equity, Acquisition Date 8/12/2021, Series Preferred Series F2023-03-310001280784Debt Investments Drug Discovery & Development and Tarsus Pharmaceuticals, Inc. Senior Secured, Maturity Date February 2027, Prime + 4.45%, Floor rate 8.45%, Cap rate 11.45%, 4.75% Exit Fee2023-03-310001280784Debt Investments Software and Salary.com, LLC, Senior Secured, Maturity Date September 2027, 6-month SOFR + 8.00%, Floor rate 9.00%2022-12-310001280784htgc:PharmaceuticalsMemberhtgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMember2023-03-310001280784Warrant Investments and Consumer & Business Services and RumbleON, Inc., Warrant, Acquisition Date 4/30/2018, Common Stock2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2022-03-310001280784htgc:SBADebenturesIssuedOnJanuaryFourteenTwoThousandAndTwentyTwoMember2023-03-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:SBADebenturesMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:AryakaNetworksIncMember2022-12-310001280784htgc:TwoThousandThirtyThreeNotesMemberhtgc:UnderwritingMember2023-03-310001280784Equity Investments Software and Lightbend, Inc., Equity, Acquisition Date 12/4/2020, Series Common Stock2022-12-310001280784htgc:FeverLabsIncMemberhtgc:DebtInvestmentsMember2023-03-310001280784Warrant Investments and Software and Delphix Corp., Warrant, Acquisition Date 10/8/2019, Common Stock2023-03-310001280784us-gaap:UnsecuredDebtMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784Warrant Investments and Software and Fulfil Solutions, Inc., Warrant, Acquisition Date 7/29/2022, Common Stock2022-12-310001280784Debt Investments Drug Discovery & Development and Hibercell, Inc. Senior Secured, Maturity Date May 2025, Prime + 5.40%, Floor rate 8.65%, 4.95% Exit Fee2023-03-310001280784Equity Investments Drug Discovery & Development and Dynavax Technologies, Equity, Acquisition Date 7/22/2015, Series Common Stock2022-12-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMember2021-12-310001280784Equity Investments Consumer & Business Services and OfferUp, Inc., Equity, Acquisition Date 10/25/2016, Series Preferred Series A-12023-03-310001280784htgc:SeptemberTwoThousandTwentySixNotesMember2022-01-012022-03-310001280784Debt Investments Semiconductors (1.51%)2022-12-310001280784htgc:TarsusPharmaceuticalsIncMemberhtgc:DebtInvestmentsMember2023-03-310001280784Debt Investments Software and Catchpoint Systems, Inc., Senior Secured, Maturity Date June 2026, 3-month SOFR + 8.86%, Floor rate 9.76%2022-12-310001280784htgc:DiversifiedFinancialServicesMember2022-12-310001280784htgc:DiversifiedFinancialServicesMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784Equity Investments Surgical Devices and Gynesonics, Inc., Equity, Acquisition Date 12/18/2018, Series Preferred Series F-12023-03-310001280784Debt Investments Software and Nextroll, Inc., Senior Secured, Maturity Date July 2023, Prime + 3.75%, Floor rate 7.75%, PIK Interest 2.95%, 1.95% Exit Fee2022-12-310001280784Warrant Investments and Consumer & Business Products and TFG Holding, Inc., Warrant, Acquisition Date 6/27/2014, Common Stock2022-12-310001280784Debt Investments Consumer & Business Services and Houzz, Inc. Convertible Debt, Maturity Date May 2028, PIK Interest 5.50%2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:VidaHealthMember2022-12-310001280784Warrant Investments and Consumer & Business Services and Skyword, Inc., Warrant, Acquisition Date 8/23/2019, Preferred Series B2022-12-3100012807842022-01-012022-12-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerMember2022-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:BrainCorporationMember2022-12-310001280784Debt Investments Drug Discovery & Development and Valo Health, LLC, Senior Secured, Maturity Date May 2024, Prime + 6.45%, Floor rate 9.70%, 3.85% Exit Fee2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2022-01-012022-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:CollateralTypeConcentrationRiskMemberhtgc:SeniorSecuredFirstLienMember2022-01-012022-12-310001280784us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001280784Debt Investments Drug Discovery & Development and Unity Biotechnology, Inc. Senior Secured, Maturity Date August 2024, Prime + 6.10%, Floor rate 9.35%, 6.25% Exit Fee2023-03-310001280784us-gaap:RestrictedStockMemberhtgc:CapitalInExcessOfParValueMember2023-01-012023-03-310001280784us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMember2022-12-310001280784Warrant Investments and Drug Discovery & Development and Century Therapeutics, Inc., Warrant, Acquisition Date 9/14/2020, Common Stock2023-03-310001280784Warrant Investments and Medical Devices & Equipment and Flowonix Medical Incorporated2022-12-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:SeptemberTwoThousandTwentySixNotesMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:FulfilSolutionsIncMember2022-12-310001280784Equity Investments Semiconductors and Achronix Semiconductor Corporation, Equity, Acquisition Date 7/1/2011, Series Preferred Series C2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerMemberhtgc:ControlAndAffiliateInvestmentsMember2022-01-012022-03-310001280784htgc:SBADebenturesIssuedOnAugustTwentyTwoThousandAndTwentyOneMember2023-01-012023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:InvestmentTypeConcentrationRiskMemberhtgc:EquityInvestmentsMemberus-gaap:CommonStockMember2023-01-012023-03-310001280784Warrant Investments and Software and Convoy, Inc., Warrant, Acquisition Date 3/30/2022, Common Stock2022-12-310001280784htgc:ManufacturingTechnologyMemberhtgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784htgc:SignalMediaLimitedMemberhtgc:DebtInvestmentsMember2023-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:CA2022-01-012022-12-310001280784us-gaap:CommonStockMember2023-01-012023-03-310001280784htgc:DeferredFeesMember2022-12-310001280784htgc:FebruaryTwoThousandTwentyFiveNotesMemberhtgc:UnusedFacilityOtherFeesMember2022-01-012022-03-310001280784Debt Investments Drug Discovery & Development and Bicycle Therapeutics PLC, Senior Secured, Maturity Date July 2025, Prime + 4.55%, Floor rate 8.05%, Cap rate 9.05%, 5.00% Exit Fee2023-03-310001280784us-gaap:CommonStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784us-gaap:FairValueInputsLevel2Memberus-gaap:CommonStockMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784Equity Investments Drug Discovery & Development, Valo Health LLC2022-12-310001280784Warrant Investments and Media/Content/Info and Fever Labs, Inc., Warrant, Acquisition Date 12/30/2022, Preferred Series E-12022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-01-012023-03-310001280784htgc:IndustrySectorMember2023-01-012023-03-310001280784Equity Investments Drug Discovery & Development and Humanigen, Inc., Equity, Acquisition Date 3/31/2021, Series Common 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Preferred Series 32022-12-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMember2023-03-3100012807842022-12-310001280784Debt Investments Software and Cybermaxx Intermediate Holdings, Inc., Senior Secured, Maturity Date August 2026, 6-month SOFR + 8.63%, Floor rate 9.38%2023-03-310001280784Debt Investments Software and Dashlane, Inc., Senior Secured, Maturity Date July 2025, Prime + 3.05%, Floor rate 7.55%, PIK Interest 1.10%, 6.29% Exit Fee2023-03-310001280784htgc:JulyTwoThousandTwentyFourNotesMember2022-01-012022-03-310001280784us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-03-310001280784us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMember2023-03-310001280784Warrant Investments and Drug Discovery & Development and Kura Oncology, Inc., Warrant, Acquisition Date 11/2/2022, Common Stock2023-03-310001280784htgc:MUFGBankFacilityMember2022-01-012022-03-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMember2022-12-310001280784us-gaap:UnsecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784us-gaap-supplement:InvestmentUnaffiliatedIssuerMember2023-03-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:DrugDeliveryMember2022-01-012022-12-310001280784Warrant Investments and Medical Devices & Equipment and Flowonix Medical Incorporated, Warrant, Acquisition Date 9/21/2018, Preferred Series BB2023-03-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:EscrowReceivableMemberus-gaap:FairValueMeasurementsRecurringMember2023-01-012023-03-310001280784Warrant Investments and Software and Reltio, Inc., Warrant, Acquisition Date 6/30/2020, Common Stock2023-03-310001280784Debt Investments Communications & Networking and Aryaka Networks, Inc. Senior Secured, Maturity Date July 2026, Prime + 3.25%, Floor rate 6.75%, PIK Interest 1.05%, 3.55% Exit Fee2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:AlchemerLLCMember2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:SurgicalDevicesMember2022-01-012022-12-310001280784Warrant Investments and Medical Devices & Equipment and Aspire Bariatrics, Inc., Warrant, Acquisition Date 1/28/2015, Common Stock2023-03-310001280784Debt Investments Consumer & Business Services and Worldremit Group Limited, Senior Secured, Maturity Date February 2025, 3-month LIBOR + 9.25%, Floor rate 10.25%, 3.20% Exit Fee2023-03-310001280784htgc:DividendDeclaredThreeMember2022-01-012022-12-310001280784htgc:September2026NotesMember2023-01-012023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:LogicSourceMember2022-12-3100012807842023-03-310001280784htgc:SBADebenturesMember2023-01-012023-03-310001280784Warrant Investments and Drug Delivery and BioQ Pharma Incorporated, Warrant, Acquisition Date 10/27/2014, Common Stock2023-03-310001280784htgc:JulyTwoThousandTwentyFourNotesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Warrant Investments and Software and Couchbase, Inc., Warrant, Acquisition Date 4/25/2019, Common Stock2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:CoronadoAestheticsLLCMemberus-gaap:CommonStockMemberhtgc:MajorityOwnedControlInvestmentsMember2022-03-310001280784us-gaap:WarrantMembersrt:MinimumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMember2023-03-310001280784htgc:DiscountsAmortizationMember2023-01-012023-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:DE2023-01-012023-03-310001280784htgc:JanuaryTwoThousandTwentySevenNotesMember2022-01-012022-03-310001280784htgc:SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember2023-01-012023-03-310001280784Debt Investments Information Services and Yipit, LLC, Senior Secured, Maturity Date September 2026, 1-month SOFR + 9.14%, Floor rate 10.04%2023-03-310001280784Debt Investments Drug Discovery & Development and Cellarity, Inc. Senior Secured, Maturity Date June 2026, Prime + 5.70%, Floor rate 8.95%, 3.75% Exit Fee2022-12-310001280784htgc:SBADebenturesIssuedOnDecemberTwentyEightTwoThousandAndTwentyOneMember2023-01-012023-03-310001280784htgc:JuneTwoThousandTwentyFiveThreeYearNotesMemberhtgc:UnusedFacilityOtherFeesMember2023-01-012023-03-310001280784Debt Investments Drug Discovery & Development and Unity Biotechnology, Inc. Senior Secured, Maturity Date August 2024, Prime + 6.10%, Floor rate 9.35%, 6.25% Exit Fee2022-12-310001280784us-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:SeptemberTwoThousandTwentySixNotesMember2022-12-310001280784htgc:HerculesCapitalFourLPMember2023-03-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:ConsumerAndBusinessProductsMember2023-01-012023-03-310001280784Warrant Investments and Biotechnology Tools and Alamar Biosciences, Inc., Warrant, Acquisition Date 6/21/2022, Preferred Series B2022-12-310001280784htgc:September2026NotesMember2023-03-310001280784htgc:DividendDeclaredTwoMember2022-01-012022-12-310001280784Warrant Investments and Drug Discovery & Development and X4 Pharmaceuticals, Inc., Warrant, Acquisition Date 12/9/2022, Common Stock2022-12-310001280784htgc:CoronadoAestheticsLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2022-03-310001280784Debt Investments Drug Discovery & Development and Codiak Biosciences, Inc. Senior Secured, Maturity Date October 2025, Prime + 5.00%, Floor rate 8.25%, 5.50% Exit Fee2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:DemandbaseIncorporationMember2022-12-310001280784Warrant Investments and Information Services and NetBase Solutions, Inc., Warrant, Acquisition Date 8/22/2017, Preferred Series 12023-03-310001280784country:IL2022-12-310001280784htgc:InvestmentFundsAndVehiclesMember2022-12-310001280784us-gaap:CommonStockMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784Equity Investments Drug Discovery & Development and Albireo Pharma, Inc., Equity, Acquisition Date 9/14/2020, Series Common Stock2022-12-310001280784htgc:March2026ANotesMember2023-03-310001280784htgc:SumitomoMitsuiBankingCorporationFacilityMember2023-01-012023-03-310001280784Warrant Investments and Software and Leapwork ApS, Warrant, Acquisition Date 1/23/2023, Common Stock2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:OtherControlInvestmentsMember2022-03-310001280784Warrant Investments and Software and Tact.ai Technologies, Inc., Warrant, Acquisition Date 2/13/2020, Common Stock2022-12-310001280784Equity Investments Drug Discovery & Development and NorthSea Therapeutics, Equity, Acquisition Date 12/15/2021, Series Preferred Series C2023-03-310001280784country:GB2023-03-310001280784Warrant Investments and Medical Devices & Equipment and Lucira Health, Inc., Warrant, Acquisition Date 2/4/2022, Common Stock2022-12-310001280784Debt Investments Drug Discovery & Development and Seres Therapeutics, Inc. Senior Secured, Maturity Date October 2024, Prime + 6.40%, Floor rate 9.65%, 4.98% Exit Fee2023-03-310001280784htgc:AdviserSubsidiaryMember2023-03-310001280784htgc:RealizedGainLossMember2023-01-012023-03-310001280784Equity Investments Software and Nextdoor.com, Inc., Equity, Acquisition Date 8/1/2018, Series Common Stock2023-03-310001280784Investment Funds & Vehicles Investments (0.28%)2022-12-310001280784htgc:DebtInvestmentsMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMemberhtgc:TechnologyMember2022-12-310001280784Debt Investments Drug Discovery & Development and Geron Corporation, Senior Secured, Maturity Date October 2024, Prime + 5.75%, Floor rate 9.00%, 6.55% Exit Fee2022-12-310001280784Debt Investments Consumer & Business Services and Thumbtack, Inc. Senior Secured, Maturity Date April 2026, Prime + 4.95%, Floor rate 8.20%, PIK Interest 1.50%, 3.95% Exit Fee2022-12-310001280784htgc:MarchTwoThousandTwentySixBNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310001280784Debt Investments (199.47%)2022-12-310001280784us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2022-12-310001280784htgc:DiversifiedFinancialServicesMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784Equity Investments Software, SingleStore, Inc.2022-12-310001280784Equity Investments Semiconductors and Achronix Semiconductor Corporation, Equity, Acquisition Date 7/1/2011, Series Preferred Series C2022-12-310001280784Warrant Investments and Consumer & Business Services and Worldremit Group Limited, Warrant, Acquisition Date 8/27/2021, Preferred Series E2022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784us-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-03-310001280784htgc:SBADebenturesMember2022-12-310001280784Debt Investments Software and Riviera Partners LLC, Senior Secured, Maturity Date April 2027, 6-month SOFR + 7.53%, Floor rate 8.53%2023-03-310001280784Warrant Investments and Consumer & Business Services and Skyword, Inc.2022-12-310001280784Equity Investments Drug Discovery & Development and Applied Molecular Transport, Equity, Acquisition Date 4/6/2021, Series Common Stock2022-12-310001280784Warrant Investments and Software and Cutover, Inc., Warrant, Acquisition Date 9/21/2022, Common Stock2023-03-310001280784htgc:HerculesCapitalFourLPMember2023-01-012023-03-310001280784htgc:DeferredFeesMember2023-03-310001280784Warrant Investments and Drug Discovery & Development and ADMA Biologics, Inc., Warrant, Acquisition Date 2/24/2014, Common Stock2023-03-310001280784Debt Investments Diversified Financial Services and Hercules Adviser LLC, Unsecured, Maturity Date June 2025, FIXED 5.00%2022-12-310001280784Debt Investments Drug Discovery & Development and Phathom Pharmaceuticals, Inc. Senior Secured, Maturity Date October 2026, Prime + 2.25%, Floor rate 5.50%, PIK Interest 3.35%, 7.50% Exit Fee2023-03-310001280784country:US2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMemberhtgc:AffiliateInvestmentsMember2022-01-012022-03-310001280784Equity Investments Electronics & Computer Hardware and Skydio, Inc., Equity, Acquisition Date 3/8/2022, Series Preferred Series E2022-12-310001280784Warrant Investments and Software and Elation Health, Inc., Warrant, Acquisition Date 9/12/2022, Common Stock2022-12-310001280784htgc:DistributableEarningsLossMember2022-01-012022-03-310001280784Equity Investments Consumer & Business Services and Rhino Labs, Inc., Equity, Acquisition Date 1/24/2022, Series Preferred Series B-22023-03-310001280784us-gaap:IncomeApproachValuationTechniqueMemberhtgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:TechnologyMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:ElationHealthIncMember2022-12-310001280784us-gaap:EquitySecuritiesMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784Investment Funds & Vehicles Investments and Drug Discovery & Development and Forbion Growth Opportunities Fund I C.V., Investment Funds & Vehicles, Acquisition Date 11/16/20202023-03-310001280784country:DE2022-12-310001280784Debt Investments Software and Fortified Health Security, Senior Secured, Maturity Date December 2027, 6-month SOFR + 7.79%, Floor rate 8.54%2023-03-310001280784htgc:FebruaryTwoThousandTwentyFiveNotesMemberhtgc:UnusedFacilityOtherFeesMember2023-01-012023-03-310001280784Warrant Investments and Media/Content/Info 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Equity, Acquisition Date 12/8/2015, Series Preferred Series D2023-03-310001280784htgc:AssetBackedNotesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2022-12-310001280784Equity Investments Software and Druva Holdings, Inc., Equity, Acquisition Date 8/24/2017, Series Preferred Series 32023-03-310001280784Equity Investments Consumer & Business Products and TechStyle, Inc., Equity, Acquisition Date 4/30/2010, Series Common Stock2022-12-310001280784Equity Investments Sustainable and Renewable Technology and Impossible Foods, Inc., Equity, Acquisition Date 5/10/2019, Series Preferred Series E-12023-03-310001280784Warrant Investments and Drug Discovery & Development and Cellarity, Inc., Warrant, Acquisition Date 12/8/2021, Preferred Series B2022-12-310001280784Equity Investments Consumer & Business Services and Tectura Corporation, Equity, Acquisition Date 5/23/2018, Series Common 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Stock2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:UnsecuredDebtMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-01-012023-03-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMembersrt:WeightedAverageMemberhtgc:ValuationTechniqueMarketAdjustedOpmBacksolveMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMember2022-01-012022-03-310001280784Equity Investments Software and Druva Holdings, Inc., Equity, Acquisition Date 10/22/2015, Series Preferred Series 22022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:TecturaCorporationMember2023-01-012023-03-310001280784country:US2022-12-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:MarchTwoThousandTwentySixANotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784htgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMembersrt:MaximumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:SeptemberTwoThousandTwentySixNotesMember2023-03-310001280784htgc:ZappiIncMemberhtgc:DebtInvestmentsMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:UnsecuredDebtMemberhtgc:OtherControlInvestmentsMemberhtgc:GibraltarBusinessCapitalLLCMember2023-01-012023-03-310001280784Warrant Investments and Sustainable and Renewable Technology and Halio, Inc., Warrant, Acquisition Date 4/22/2014, Preferred Series A2022-12-310001280784us-gaap:SalesRevenueNetMemberhtgc:CollateralTypeConcentrationRiskMemberhtgc:SecondLienMember2022-01-012022-12-310001280784htgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784Debt Investments Software and Campaign Monitor Limited, Senior Secured, Maturity Date November 2025, 6-month SOFR + 8.90%, Floor rate 9.90%2022-12-310001280784htgc:SMBCFacilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Debt Investments Software and Zappi, Inc., Senior Secured, Maturity Date December 2027, 3-month SOFR + 8.03%, Floor rate 9.03%2023-03-310001280784Equity Investments Medical Devices & Equipment and ViewRay, Inc., Equity, Acquisition Date 12/16/2013, Series Common Stock2023-03-310001280784htgc:JulyTwoThousandTwentyFourNotesMemberhtgc:UnusedFacilityOtherFeesMember2022-01-012022-03-310001280784htgc:TwoThousandTwentyTwoConvertibleNotesMemberhtgc:UnusedFacilityOtherFeesMember2022-01-012022-03-310001280784htgc:DiversifiedFinancialServicesMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:EscrowReceivableMemberus-gaap:FairValueMeasurementsRecurringMember2022-01-012022-03-310001280784Equity Investments Drug Discovery & Development and Valo Health, LLC, Equity, Acquisition Date 12/11/2020, Series Preferred Series B2022-12-310001280784Warrant Investments and Software and Reltio, Inc., Warrant, Acquisition Date 6/30/2020, Common Stock2022-12-310001280784Debt Investments Software and Esme Learning Solutions, Inc., Senior Secured, Maturity Date February 2025, Prime + 5.50%, Floor rate 8.75%, PIK Interest 1.50%, 3.00% Exit Fee2023-03-310001280784htgc:EquityAndWarrantInvestmentsMember2023-01-012023-03-310001280784Debt Investments Consumer & Business Services and Jobandtalent USA, Inc. Senior Secured, Maturity Date February 2025, 1-month SOFR + 8.86%, Floor rate 9.75%, 3.00% Exit Fee2023-03-310001280784htgc:PharmaceuticalsMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputHypotheticalMarketYieldMemberhtgc:ValuationTechniqueMarketComparableCompaniesMember2023-03-310001280784Warrant Investments and Consumer & Business Services and Worldremit Group Limited, Warrant, Acquisition Date 2/11/2021, Preferred Series D2023-03-310001280784Warrant Investments and Software and The Faction Group LLC, Warrant, Acquisition Date 11/3/2014, Preferred Series 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Services, Veem, Inc.2022-12-310001280784Equity Investments Diversified Financial Services and Hercules Adviser LLC, Equity, Acquisition Date 3/26/2021, Series Member Units2023-03-310001280784Debt Investments Consumer & Business Services and Tectura Corporation, Senior Secured, Maturity Date July 2024 One, PIK Interest 5.00%2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:OtherControlInvestmentsMember2022-01-012022-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:CoronadoAestheticsLLCMemberus-gaap:CommonStockMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784htgc:AssetBackedNotesMember2023-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMember2023-03-310001280784Equity Investments Drug Discovery & Development and Savara, Inc., Equity, Acquisition Date 8/11/2015, Series Common Stock2023-03-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:MediaContentInfoMember2022-01-012022-12-310001280784htgc:CoronadoAestheticsLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:SeriesAPreferredStockMemberhtgc:MedicalDevicesAndEquipmentMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2023-03-310001280784htgc:June2025NotesMember2023-03-310001280784htgc:CybermaxxIntermediateHoldingsIncorporationMemberhtgc:DebtInvestmentsMember2023-03-310001280784Equity Investments Consumer & Business Services and Total OfferUp, Inc.2022-12-310001280784Debt Investments Drug Discovery & Development and HilleVax, Inc. Senior Secured, Maturity Date May 2027, Prime + 1.05%, Floor rate 4.55%, Cap rate 6.05%, PIK Interest 2.85%, 7.15% Exit Fee2023-03-310001280784Warrant Investments and Sustainable and Renewable Technology and Ampion, PBC, Warrant, Acquisition Date 4/15/2022, Common Stock2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:CutoverIncMember2022-12-310001280784us-gaap:FairValueInputsLevel3Memberhtgc:EscrowReceivableMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310001280784htgc:PromissoryNotesMemberhtgc:BlackCrowAIIncMember2022-12-310001280784Warrant Investments and Software and Aria Systems, Inc., Warrant, Acquisition Date 5/22/2015, Preferred Series G2023-03-310001280784Equity Investments Drug Discovery & Development and Humanigen, Inc., Equity, Acquisition Date 3/31/2021, Series Common Stock2023-03-310001280784htgc:TwoThousandTwentyTwoConvertibleNotesMember2022-01-012022-03-310001280784Equity Investments Sustainable and Renewable Technology and NantEnergy, LLC, Equity, Acquisition Date 8/31/2013, Series Common Units2023-03-310001280784htgc:SBADebenturesIssuedOnAugustTwentyTwoThousandAndTwentyOneMember2022-12-310001280784Warrant Investments and Consumer & Business Services and Udacity, Inc., Warrant, Acquisition Date 9/25/2020, Common Stock2023-03-310001280784Equity Investments Diversified Financial Services and Newfront Insurance Holdings, Inc., Equity, Acquisition Date 9/30/2021, Series Preferred Series D-22023-03-310001280784us-gaap:WarrantMembersrt:MaximumMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:MadrigalPharmaceuticalIncMember2023-03-310001280784htgc:PharmaceuticalsMemberhtgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMember2022-12-310001280784Equity Investments Sustainable and Renewable Technology and Impossible Foods, Inc., Equity, Acquisition Date 5/10/2019, Series Preferred Series E-12022-12-310001280784Equity Investments Sustainable and Renewable Technology and Pivot Bio, Inc., Equity, Acquisition Date 6/28/2021, Series Preferred Series D2022-12-310001280784Warrant Investments and Software and Dashlane, Inc., Warrant, Acquisition Date 3/11/2019, Common Stock2023-03-310001280784htgc:JuneTwoThousandTwentyFiveNotesMemberhtgc:UnusedFacilityOtherFeesMember2022-01-012022-03-310001280784Warrant Investments and Software and First Insight, Inc., Warrant, Acquisition Date 5/10/2018, Preferred Series B2022-12-310001280784Debt Investments Software and Dashlane, Inc., Senior Secured, Maturity Date July 2025, Prime + 3.05%, Floor rate 7.55%, PIK Interest 1.10%, 4.95% Exit Fee2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:ConstructorIoCorporationMember2022-12-310001280784Debt Investments Sustainable and Renewable Technology and Pineapple Energy LLC, Senior Secured, Maturity Date December 2024, PIK Interest 10.00%2022-12-310001280784htgc:PerformanceDeuMember2022-01-012022-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:GB2023-01-012023-03-310001280784htgc:TwoThousandEighteenMemberus-gaap:RestrictedStockMember2018-06-280001280784Equity Investments Surgical Devices and Gynesonics, Inc., Equity, Acquisition Date 1/18/2007, Series Preferred Series B2022-12-310001280784Debt Investments Manufacturing Technology and Ouster, Inc. Senior Secured, Maturity Date May 2026, Prime + 6.15%, Floor rate 9.40%, 7.45% Exit Fee2022-12-310001280784htgc:ContractualInterestIncomeMember2023-01-012023-03-310001280784htgc:AcceleratedFeeIncomeEarlyRepaymentsMember2022-01-012022-03-310001280784Equity Investments Drug Delivery (0.00%)2023-03-310001280784Warrant Investments and Drug Delivery and PDS Biotechnology Corporation, Warrant, Acquisition Date 8/28/2014, Common Stock2022-12-310001280784htgc:ModernLifeIncMemberhtgc:DebtInvestmentsMember2023-03-310001280784Warrant Investments and Medical Devices & Equipment and Flowonix Medical Incorporated, Warrant, Acquisition Date 11/3/2014, Preferred Series AA2022-12-310001280784htgc:PineappleEnergyLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:CommonStockMember2022-03-310001280784us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:TwoThousandThirtyOneAssetBackedNotesMember2023-03-310001280784htgc:CommunicationsAndNetworkingMember2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:MedicalDevicesAndEquipmentMember2022-01-012022-12-310001280784htgc:SurgicalDevicesMember2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784Warrant Investments and Information Services and Capella Space Corp., Warrant, Acquisition Date 10/21/2021, Common Stock2023-03-310001280784htgc:SeniorSecuredDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784Warrant Investments and Medical Devices & Equipment and Tela Bio, Inc., Warrant, Acquisition Date 3/31/2017, Common Stock2022-12-310001280784Warrant Investments and Sustainable and Renewable Technology and Halio, Inc., Warrant, Acquisition Date 4/7/2015, Preferred Series B2022-12-310001280784Debt Investments Healthcare Services, Other and Equality Health, LLC, Senior Secured, Maturity Date February 2026, Prime + 6.25%, Floor rate 9.50%, PIK Interest 1.55%2022-12-310001280784htgc:SMBCFacilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784htgc:CoronadoAestheticsLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:MajorityOwnedControlInvestmentsMember2021-12-310001280784htgc:DebtInvestmentsMemberhtgc:ThreatConnectIncMember2022-12-310001280784htgc:SBADebenturesIssuedOnDecemberTwentyEightTwoThousandAndTwentyOneMember2022-12-310001280784us-gaap:EstimateOfFairValueFairValueDisclosureMemberhtgc:TwoThousandThirtyOneAssetBackedNotesMember2022-12-310001280784Equity Investments Electronics & Computer Hardware (0.11%)2022-12-310001280784Debt Investments Consumer & Business Services and Provi, Senior Secured, Maturity Date December 2026, Prime + 4.40%, Floor rate 10.65%, 2.95% Exit Fee2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:PreferredStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-03-310001280784Warrant Investments and Surgical Devices and TransMedics Group, Inc., Warrant, Acquisition Date 9/11/2015, Common Stock2022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:MarketComparableCompaniesMember2023-03-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMember2022-12-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:TwoThousandThirtyThreeNotesMember2023-01-012023-03-310001280784htgc:DrugDeliveryMember2023-03-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMembersrt:MaximumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784htgc:September2026NotesMember2021-09-162021-09-160001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784Equity Investments Drug Discovery & Development and Sio Gene Therapies, Inc., Equity, Acquisition Date 2/2/2017, Series Common Stock2023-03-310001280784Debt Investments Communications & Networking and Aryaka Networks, Inc. Senior Secured, Maturity Date July 2026, Prime + 3.25%, Floor rate 6.75%, PIK Interest 1.05%, 3.55% Exit Fee2022-12-310001280784us-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784Equity Investments Medical Devices & Equipment and Flowonix Medical Incorporated, Equity, Acquisition Date 11/3/2014, Series Preferred Series AA2022-12-310001280784Debt Investments Drug Discovery & Development and uniQure B.V. Senior Secured, Maturity Date December 2025, Prime + 4.70%, Floor rate 7.95%, 7.28% Exit Fee2022-12-310001280784Warrant Investments and Drug Discovery & Development and Axsome Therapeutics, Inc., Warrant, Acquisition Date 9/25/2020, Common Stock2022-12-310001280784us-gaap:SubsequentEventMemberhtgc:BaseAndSupplementalDividendMember2023-04-272023-04-270001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784htgc:DiversifiedFinancialServicesMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:SeriesAPreferredStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784Warrant Investments and Drug Delivery and PDS Biotechnology Corporation, Warrant, Acquisition Date 8/28/2014, Common Stock2023-03-310001280784htgc:ServiceVestingAwardsMember2023-01-012023-03-310001280784us-gaap:IncomeApproachValuationTechniqueMemberhtgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMember2022-12-310001280784htgc:SignificantPortfolioInvestmentMember2023-01-012023-03-310001280784Warrant Investments and Medical Devices & Equipment (0.04%)2023-03-310001280784Debt Investments Diversified Financial Services, Gibraltar Business Capital, LLC, Unsecured2022-12-310001280784Debt Investments Drug Discovery & Development and ATAI Life Sciences N.V. Senior Secured, Maturity Date August 2026, Prime + 4.55%, Floor rate 8.55%, 6.95% Exit Fee2023-03-310001280784Warrant Investments and Consumer & Business Products and Whoop, Inc., Warrant, Acquisition Date 6/27/2018, Preferred Series C2022-12-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784Warrant Investments and Communications & Networking and Spring Mobile Solutions, Inc., Warrant, Acquisition Date 4/19/2013, Common Stock2022-12-310001280784htgc:SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember2023-01-012023-03-310001280784htgc:July2024NotesMember2023-01-012023-03-310001280784htgc:PharmaceuticalsMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMember2023-03-310001280784Debt Investments Drug Discovery & Development and Corium, Inc. Senior Secured, Maturity Date September 2026, Prime + 5.70%, Floor rate 8.95%, 7.75% Exit Fee2023-03-310001280784htgc:MUFGBankFacilityMember2023-01-012023-03-310001280784Debt Investments Biotechnology Tools and Alamar Biosciences, Inc. Senior Secured, Maturity Date June 2026, Prime + 3.00%, Floor rate 6.50%, PIK Interest 1.00%, 5.95% Exit Fee2023-03-310001280784htgc:IncludedInCostMember2023-03-310001280784Equity Investments Surgical Devices and Gynesonics, Inc., Equity, Acquisition Date 6/16/2010, Series Preferred Series C2022-12-310001280784Debt Investments Consumer & Business Services and SeatGeek, Inc. Senior Secured, Maturity Date May 2026, Prime + 7.00%, Floor rate 10.50%, PIK Interest 0.50%2022-12-310001280784htgc:SMBCFacilityMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerMember2022-01-012022-03-310001280784Warrant Investments and Drug Discovery & Development and Albireo Pharma, Inc., Warrant, Acquisition Date 6/8/2020, Common Stock2022-12-310001280784us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784Debt Investments Software and ShadowDragon, LLC, Senior Secured, Maturity Date December 2026, 1-month LIBOR + 8.97%, Floor rate 9.97%2023-03-310001280784Warrant Investments and Drug Discovery & Development and TG Therapeutics, Inc., Warrant, Acquisition Date 2/28/2019, Common Stock2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:RivieraPartnersLLCMember2023-03-310001280784htgc:ManufacturingTechnologyMember2023-03-310001280784htgc:SurgicalDevicesMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:DispatchTechnologiesIncMember2023-03-310001280784htgc:SBADebenturesIssuedOnMarchTwentySixTwoThousandAndTwentyOneMember2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:SemiconductorsMember2022-01-012022-12-310001280784htgc:EquityAndWarrantInvestmentsMember2022-01-012022-03-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:SoftwareMember2023-01-012023-03-310001280784htgc:TwoThousandThirtyThreeNotesMember2022-12-310001280784Warrant Investments and Consumer & Business Products and Whoop, Inc., Warrant, Acquisition Date 6/27/2018, Preferred Series C2023-03-310001280784htgc:MarchTwoThousandTwentySixBNotesMember2022-01-012022-03-310001280784Warrant Investments and Consumer & Business Services and SeatGeek, Inc., Warrant, Acquisition Date 6/12/2019, Common Stock2023-03-310001280784Debt Investments Software and Mobile Solutions Services, Senior Secured, Maturity Date December 2025, 3-month LIBOR + 9.06%, Floor rate 10.06%2023-03-310001280784Equity Investments Drug Discovery & Development and Valo Health, LLC, Equity, Acquisition Date 10/31/2022, Series Preferred Series C2022-12-310001280784htgc:TwoThousandThirtyOneAssetBackedNotesMember2023-03-310001280784htgc:SignalMediaLimitedMemberhtgc:DebtInvestmentsMember2022-12-310001280784Warrant Investments and Software and SingleStore, Inc., Warrant, Acquisition Date 4/28/2020, Preferred Series D2023-03-310001280784Debt Investments Drug Discovery & Development and Replimune Group, Inc. Senior Secured, Maturity Date October 2027, Prime + 1.75%, Floor rate 7.25%, Cap rate 9.00%, PIK Interest 1.50%, 4.95% Exit Fee2022-12-310001280784Equity Investments Drug Discovery & Development and Avalo Therapeutics, Inc., Equity, Acquisition Date 8/19/2014, Series Common Stock2023-03-310001280784Warrant Investments and Software and Nuvolo Technologies Corporation, Warrant, Acquisition Date 3/29/2019, Common Stock2022-12-310001280784Debt Investments Diversified Financial Services and Hercules Adviser LLC, Unsecured, Maturity Date June 2025, FIXED 5.00%2023-03-310001280784Equity Investments Software (2.07%)2022-12-310001280784Equity Investments Drug Discovery & Development and Concert Pharmaceuticals, Inc., Equity, Acquisition Date 2/13/2019, Series Common Stock2022-12-310001280784Debt Investments Drug Discovery & Development and Locus Biosciences, Inc. Senior Secured, Maturity Date July 2025, Prime + 6.10%, Floor rate 9.35%, 4.95% Exit Fee2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-01-012022-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:CA2023-01-012023-03-310001280784Debt Investments Manufacturing Technology and Bright Machines, Inc. Senior Secured, Maturity Date April 2025, Prime + 4.00%, Floor rate 9.50%, 5.00% Exit Fee2023-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:IL2022-01-012022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784Debt Investments Drug Discovery & Development and Redshift Bioanalytics, Inc. Senior Secured, Maturity Date January 2026, Prime + 4.25%, Floor rate 7.50%, 3.80% Exit Fee2023-03-310001280784htgc:DebtInvestmentsMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMemberhtgc:TechnologyMember2023-03-310001280784htgc:InvestmentFundsAndVehiclesMember2023-03-310001280784Warrant Investments and Drug Discovery & Development and Axsome Therapeutics, Inc., Warrant, Acquisition Date 9/25/2020, Common Stock2023-03-310001280784htgc:AdviserSubsidiaryMember2022-01-012022-03-310001280784Debt Investments Software and Cybermaxx Intermediate Holdings, Inc., Senior Secured, Maturity Date August 2026, 6-month SOFR + 12.36%, Floor rate 13.11%2023-03-310001280784Warrant Investments and Healthcare Services, Other (0.00%)2022-12-3100012807842021-12-310001280784Debt Investments Software and Catchpoint Systems, Inc., Senior Secured, Maturity Date June 2026, 3-month SOFR + 8.86%, Floor rate 9.76%2023-03-310001280784htgc:SeniorSecuredDebtOneMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-01-012022-12-310001280784Equity Investments Surgical Devices, Gynesonics, Inc.2023-03-310001280784Debt Investments Drug Discovery & Development and BridgeBio Pharma, Inc. Senior Secured, Maturity Date November 2026, FIXED 9.00%, 2.00% Exit Fee2022-12-310001280784Equity Investments Medical Devices & Equipment and Flowonix Medical Incorporated, Equity, Acquisition Date 11/3/2014, Series Preferred Series AA2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:PreferredSeriesBBMemberhtgc:TecturaCorporationMember2022-12-310001280784htgc:MUFGBankFacilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784htgc:JulyTwoThousandTwentyFourNotesMember2023-03-310001280784Equity Investments Consumer & Business Services (0.57%)2022-12-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:DebtMaturingWithinOneYearMember2022-12-310001280784Warrant Investments and Sustainable and Renewable Technology and IngredientWerks Holdings, Inc. (p.k.a Agrivida, Inc.), Warrant, Acquisition Date 6/20/2013, Preferred Series D2023-03-310001280784Debt Investments Drug Discovery & Development and Madrigal Pharmaceutical, Inc. Senior Secured, Maturity Date May 2026, Prime + 3.95%, Floor rate 7.45%, 5.35% Exit Fee2022-12-310001280784Warrant Investments and Software and Mixpanel, Inc., Warrant, Acquisition Date 9/30/2020, Common Stock2023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:TechnologyMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-12-310001280784Debt Investments Diversified Financial Services (3.10%)2023-03-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:UnsecuredDebtMemberhtgc:MajorityOwnedControlInvestmentsMember2023-01-012023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2021-12-310001280784Warrant Investments and Information Services (0.04%)2022-12-3100012807842023-04-260001280784Warrant Investments and Software and Couchbase, Inc., Warrant, Acquisition Date 4/25/2019, Common Stock2022-12-310001280784htgc:SBADebenturesIssuedOnDecemberTwentyTwoThousandAndTwentyOneMember2022-12-310001280784Debt Investments Software and Annex Cloud, Senior Secured, Maturity Date February 2027, 1-month BSBY + 8.99%, Floor rate 9.99%2023-03-310001280784htgc:PharmaceuticalsMemberhtgc:DebtInvestmentsMemberhtgc:MeasurementInputCollateralRecoverabilityMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMember2023-03-310001280784htgc:MarchTwoThousandTwentySixBNotesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784htgc:CommonOfferingExpensesMember2022-01-012022-03-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:DrugDiscoveryAndDevelopmentMember2023-01-012023-03-310001280784us-gaap:CreditConcentrationRiskMember2023-03-310001280784Warrant Investments and Consumer & Business Services and Thumbtack, Inc., Warrant, Acquisition Date 5/1/2018, Common Stock2022-12-310001280784htgc:CapitalInExcessOfParValueMember2022-01-012022-03-310001280784Warrant Investments and Consumer & Business Services and Houzz, Inc., Warrant, Acquisition Date 10/29/2019, Common Stock2023-03-310001280784Warrant Investments and Consumer & Business Services and Udacity, Inc., Warrant, Acquisition Date 9/25/2020, Common Stock2022-12-310001280784Debt Investments Drug Discovery & Development and Tarsus Pharmaceuticals, Inc. Senior Secured, Maturity Date February 2027, Prime + 5.20%, Floor rate 8.45%, 4.75% Exit Fee2022-12-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMemberus-gaap:MemberUnitsMember2022-12-310001280784Warrant Investments and Software and Automation Anywhere, Inc., Warrant, Acquisition Date 9/23/2022, Common Stock2022-12-310001280784htgc:AssetBackedNotesMember2022-06-220001280784Equity Investments Medical Devices & Equipment and Coronado Aesthetics, LLC, Equity, Acquisition Date 10/15/2021, Series Preferred Series A-22023-03-310001280784us-gaap:EmployeeStockOptionMember2022-01-012022-03-310001280784Debt Investments Consumer & Business Services and Tectura Corporation, Senior Secured, Maturity Date July 2024 One, PIK Interest 5.00%2023-03-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMemberhtgc:TechnologyMember2023-03-310001280784Warrant Investments and Consumer & Business Products and Savage X Holding, LLC, Warrant, Acquisition Date 6/27/2014, Class A Units2022-12-310001280784Warrant Investments and Sustainable and Renewable Technology and IngredientWerks Holdings, Inc. (p.k.a Agrivida, Inc.), Warrant, Acquisition Date 6/20/2013, Preferred Series D2022-12-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:DK2023-01-012023-03-310001280784Warrant Investments and Software and DroneDeploy, Inc., Warrant, Acquisition Date 6/30/2022, Common Stock2023-03-310001280784Debt Investments Software and LogicSource, Senior Secured, Maturity Date July 2027, 3-month SOFR + 8.93%, Floor rate 9.93%2022-12-310001280784us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:MeasurementInputDiscountRateMember2022-12-310001280784htgc:DebtInvestmentsMember2022-12-310001280784htgc:MUFGBankFacilityMember2023-03-310001280784htgc:SBADebenturesIssuedOnJulyTwentyEightTwoThousandAndTwentyOneMember2022-12-310001280784htgc:SMBCFacilityMemberhtgc:UnusedFacilityOtherFeesMember2023-01-012023-03-310001280784Equity Investments Software, Druva Holdings, Inc.2023-03-310001280784Equity Investments Electronics & Computer Hardware (0.09%)2023-03-310001280784Equity Investments Software (1.66%)2023-03-310001280784Warrant Investments and Consumer & Business Products and Savage X Holding, LLC, Warrant, Acquisition Date 6/27/2014, Class A Units2023-03-310001280784Debt Investments Drug Discovery & Development and Century Therapeutics, Inc. Senior Secured, Maturity Date April 2024, Prime + 6.30%, Floor rate 9.55%, 3.95% Exit Fee2023-03-310001280784Debt Investments Software and Alchemer LLC, Senior Secured, Maturity Date May 2028, 1-month SOFR + 7.89%, Floor rate 8.89%2022-12-310001280784us-gaap:SalesRevenueNetMemberus-gaap:UnsecuredDebtMemberhtgc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2023-03-310001280784us-gaap:UnsecuredDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-01-012023-03-310001280784Equity Investments Consumer & Business Services and Nerdy Inc., Equity, Acquisition Date 9/17/2021, Series Common Stock2023-03-310001280784htgc:IncludedInCostMember2023-01-012023-03-310001280784htgc:AcceleratedFeeIncomeEarlyRepaymentsMember2023-01-012023-03-310001280784htgc:SBADebenturesIssuedOnMarchTwentySixTwoThousandAndTwentyOneMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberhtgc:VidaHealthMember2023-03-310001280784Equity Investments Surgical Devices and TransMedics Group, Inc., Equity, Acquisition Date 11/7/2012, Series Common Stock2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:UnsecuredDebtMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2021-12-310001280784Warrant Investments and Manufacturing Technology and MacroFab, Inc., Warrant, Acquisition Date 3/23/2022, Common Stock2022-12-310001280784Warrant Investments and Electronics & Computer Hardware (0.07%)2023-03-310001280784Equity Investments Drug Delivery and PDS Biotechnology Corporation, Equity, Acquisition Date 4/6/2015, Series Common Stock2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:TipaltiSolutionsLtdMember2022-12-310001280784us-gaap:EmployeeStockOptionMember2023-01-012023-03-310001280784htgc:CoronadoAestheticsLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:CommonStockMemberhtgc:MajorityOwnedControlInvestmentsMember2023-01-012023-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784htgc:TwoThousandTwentyTwoNotesMember2022-01-012022-03-310001280784Debt Investments Media/Content/Info and Fever Labs, Inc. Senior Secured, Maturity Date December 2025, Prime + 3.50%, Floor rate 9.00%, 2.98% Exit Fee2023-03-310001280784Debt Investments Drug Discovery & Development (78.49%)2023-03-310001280784Debt Investments Drug Discovery & Development and Kura Oncology, Inc. Senior Secured, Maturity Date November 2027, Prime + 2.40%, Floor rate 8.65%, 15.13% Exit Fee2023-03-310001280784Debt Investments Software and Ikon Science Limited, Senior Secured, Maturity Date October 2024, 3-month Eurodollar + 9.00%, Floor rate 10.00%2023-03-310001280784Equity Investments Surgical Devices and Gynesonics, Inc., Equity, Acquisition Date 6/16/2010, Series Preferred Series C2023-03-310001280784us-gaap:EmployeeStockOptionMember2023-01-012023-03-310001280784htgc:PharmaceuticalsMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMember2022-12-310001280784Debt Investments Software and Enmark Systems, Inc., Senior Secured, Maturity Date September 2026, 3-month LIBOR + 6.77%, Floor rate 7.77%, PIK Interest 2.16%2022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMembersrt:MinimumMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784Warrant Investments and Consumer & Business Services and Provi, Warrant, Acquisition Date 12/22/2022, Common Stock2023-03-310001280784htgc:MarchTwoThousandTwentySixBNotesMember2023-01-012023-03-310001280784Debt Investments Software and Flight Schedule Pro, LLC, Senior Secured, Maturity Date October 2027, 1-month SOFR + 7.80%, Floor rate 8.70%2023-03-310001280784us-gaap:WarrantMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMemberhtgc:ValuationTechniqueMarketAdjustedOpmBacksolveMember2022-12-310001280784Equity Investments Consumer & Business Services (0.56%)2023-03-310001280784Warrant Investments and Consumer & Business Services and Modern Life, Inc., Warrant, Acquisition Date 3/30/2022, Common Stock2023-03-310001280784htgc:JuneTwoThousandTwentyFiveNotesMember2022-01-012022-03-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMemberus-gaap:MemberUnitsMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:AkeroTherapeuticsIncMember2023-03-310001280784Warrant Investments and Communications & Networking (0.01%)2023-03-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputHypotheticalMarketYieldMemberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMemberhtgc:TechnologyMember2023-03-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2022-03-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMember2023-03-310001280784htgc:TwoThousandThirtyOneAssetBackedNotesMember2023-03-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310001280784Debt Investments Consumer & Business Services, SeatGeek, Inc.2023-03-3100012807842022-01-012022-03-310001280784Equity Investments Drug Discovery & Development and Rocket Pharmaceuticals, Ltd., Equity, Acquisition Date 8/22/2007, Series Common Stock2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:OtherControlInvestmentsMember2021-12-310001280784htgc:DiversifiedFinancialServicesMemberhtgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784Equity Investments Drug Discovery & Development and Hibercell, Inc., Equity, Acquisition Date 5/7/2021, Series Preferred Series B2022-12-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:DK2022-01-012022-12-310001280784Debt Investments Drug Discovery & Development and Akero Therapeutics, Inc. Senior Secured, Maturity Date January 2027, Prime + 3.65%, Floor rate 7.65%, 5.85% Exit Fee2022-12-310001280784Debt Investments Drug Discovery & Development and Phathom Pharmaceuticals, Inc. Senior Secured, Maturity Date October 2026, Prime + 2.25%, Floor rate 5.50%, PIK Interest 3.35%, 7.50% Exit Fee2022-12-310001280784Debt Investments Consumer & Business Services (30.59%)2022-12-310001280784htgc:DividendDeclaredTwoMember2023-01-012023-03-310001280784Equity Investments Drug Discovery & Development and Axsome Therapeutics, Inc., Equity, Acquisition Date 5/9/2022, Series Common Stock2022-12-310001280784Equity Investments Diversified Financial Services and Gibraltar Business Capital, LLC, Equity, Acquisition Date 3/1/2018, Series Common Stock2023-03-310001280784us-gaap:SubsequentEventMemberhtgc:BaseDividendMember2023-05-162023-05-160001280784us-gaap:WarrantMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMember2023-03-310001280784htgc:SpilloveramountpershareMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:PathaiIncMember2023-03-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:SBADebenturesMember2023-01-012023-03-310001280784Debt Investments Diversified Financial Services and Gibraltar Business Capital, LLC, Unsecured, Maturity Date September 2026, FIXED 11.50%2023-03-310001280784htgc:DistributableEarningsLossMember2021-12-310001280784htgc:ThreeMonthSOFRMember2023-03-310001280784htgc:MarchTwoThousandTwentySixANotesMember2022-01-012022-03-310001280784htgc:DebtInvestmentsMemberhtgc:TGTherapeuticsIncMember2023-03-310001280784htgc:IndustrySubSectorConcentrationRiskMemberhtgc:ManufacturingTechnologyMemberus-gaap:SalesRevenueNetMember2022-01-012022-12-310001280784htgc:DividendDeclaredOneMember2023-01-012023-03-310001280784Equity Investments Consumer & Business Products and Grove Collaborative, Inc., Equity, Acquisition Date 4/30/2021, Series Common Stock2022-12-310001280784Debt Investments Software and Cybermaxx Intermediate Holdings, Inc., Senior Secured, Maturity Date August 2026, 6-month SOFR + 9.53%, Floor rate 10.28%2022-12-310001280784Debt Investments Drug Discovery & Development and TG Therapeutics, Inc. Senior Secured, Maturity Date January 2026, Prime + 2.15%, Floor rate 5.40%, PIK Interest 3.45%, 5.95% Exit Fee2022-12-310001280784Warrant Investments and Software and SignPost, Inc., Warrant, Acquisition Date 1/13/2016, Series Junior 1 Preferred2023-03-310001280784Debt Investments Media/Content/Info (0.66%)2023-03-310001280784htgc:TwoThousandThirtyOneAssetBackedNotesMember2022-12-310001280784htgc:ConvertibleNoteDiscountsAmortizationMember2022-01-012022-03-310001280784Warrant Investments and Consumer & Business Products and TechStyle, Inc., Warrant, Acquisition Date 7/16/2013, Preferred Series B2022-12-310001280784Warrant Investments and Software and Cloudpay, Inc., Warrant, Acquisition Date 4/10/2018, Preferred Series B2023-03-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMember2022-12-310001280784country:DK2022-12-310001280784htgc:DepreciationMemberus-gaap:FairValueInputsLevel3Memberhtgc:PreferredStockInvestmentMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784htgc:FebruaryTwoThousandTwentyFiveNotesMember2022-01-012022-03-310001280784htgc:SixMonthLIBORMember2023-03-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:TwoThousandThirtyOneAssetBackedNotesMember2023-03-310001280784htgc:DiversifiedFinancialServicesMemberus-gaap:UnsecuredDebtMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784htgc:EscrowReceivableMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784us-gaap:WarrantMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-03-310001280784Warrant Investments and Sustainable and Renewable Technology and Halio, Inc., Warrant, Acquisition Date 4/7/2015, Preferred Series B2023-03-310001280784Equity Investments Drug Discovery & Development and Valo Health, LLC, Equity, Acquisition Date 12/11/2020, Series Preferred Series B2023-03-310001280784htgc:HealthcareServicesOtherMemberhtgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784us-gaap:UnsecuredDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310001280784Warrant Investments and Sustainable and Renewable Technology and Halio, Inc., Warrant, Acquisition Date 4/22/2014, Preferred Series A2023-03-310001280784htgc:StreamlineHealthcareSolutionsMemberhtgc:DebtInvestmentsMember2023-03-310001280784Equity Investments Consumer & Business Products (0.04%)2022-12-310001280784htgc:SBADebenturesMember2023-03-310001280784htgc:PharmaceuticalsMemberhtgc:DebtInvestmentsMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtTwoMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2022-01-012022-12-310001280784Warrant Investments and Consumer & Business Services and Worldremit Group Limited2022-12-310001280784Warrant Investments and Communications & Networking and Spring Mobile Solutions, Inc., Warrant, Acquisition Date 4/19/2013, Common Stock2023-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberhtgc:MarketComparableCompaniesMember2022-12-310001280784htgc:SustainableAndRenewableTechnologyMemberhtgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMember2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:OtherControlInvestmentsMember2023-01-012023-03-310001280784Equity Investments Software, Contentful Global, Inc.2023-03-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2023-03-310001280784htgc:SixPointTwoFiveNotesDueTwoThousandThirtyThreeMember2023-01-012023-03-310001280784country:NLus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-03-310001280784us-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-01-012022-03-310001280784Warrant Investments and Drug Discovery & Development and ADMA Biologics, Inc., Warrant, Acquisition Date 2/24/2014, Common Stock2022-12-310001280784Debt Investments Software and Elation Health, Inc., Senior Secured, Maturity Date March 2026, Prime + 4.25%, Floor rate 9.00%, PIK Interest 1.95%, 3.95% Exit Fee2022-12-310001280784htgc:MarchTwoThousandTwentySixBNotesMember2023-03-310001280784us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputTangibleBookValueMultipleMembersrt:WeightedAverageMemberhtgc:MarketComparableCompaniesMember2022-12-310001280784Warrant Investments and Drug Delivery and BioQ Pharma Incorporated, Warrant, Acquisition Date 10/27/2014, Common Stock2022-12-310001280784htgc:CoronadoAestheticsLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMember2023-01-012023-03-310001280784htgc:JanuaryTwoThousandTwentySevenNotesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784htgc:FeverLabsIncMemberhtgc:DebtInvestmentsMember2022-12-310001280784htgc:CapitalInExcessOfParValueMember2023-01-012023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:PreferredStockMemberhtgc:GibraltarBusinessCapitalLLCMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784htgc:MediaContentInfoMember2022-12-310001280784Debt Investments Consumer & Business Services and Carwow LTD Senior Secured, Maturity Date December 2024, Prime + 4.70%, Floor rate 7.95%, PIK Interest 1.45%, 4.95% Exit Fee2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:CerosIncorporationMember2023-03-310001280784Investment Funds & Vehicles Investments and Drug Discovery & Development and Forbion Growth Opportunities Fund I C.V., Investment Funds & Vehicles, Acquisition Date 11/16/20202022-12-310001280784Debt Investments Consumer & Business Services and Udacity, Inc. Senior Secured, Maturity Date September 2024, Prime + 4.50%, Floor rate 7.75%, PIK Interest 2.00%, 3.00% Exit Fee2023-03-310001280784Equity Investments Sustainable and Renewable Technology and Fulcrum Bioenergy, Inc., Equity, Acquisition Date 9/13/2012, Series Preferred Series C-12022-12-310001280784Debt Investments Information Services (3.71%)2023-03-310001280784Debt Investments Consumer & Business Services and Skyword, Inc. Senior Secured, Maturity Date November 2026, Prime + 2.75%, Floor rate 9.25%, PIK Interest 1.75%, 3.00% Exit Fee2022-12-310001280784htgc:RoyaltyContractMemberhtgc:PhathomPharmaceuticalsIncMember2022-12-310001280784us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputTangibleBookValueMultipleMemberhtgc:MarketComparableCompaniesMember2023-03-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001280784Debt Investments Software and Elation Health, Inc., Senior Secured, Maturity Date March 2026, Prime + 4.25%, Floor rate 9.00%, PIK Interest 1.95%, 3.95% Exit Fee2023-03-310001280784Warrant Investments and Medical Devices & Equipment and Flowonix Medical Incorporated, Warrant, Acquisition Date 11/3/2014, Preferred Series AA2023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:AllAssetsIncludingIntellectualPropertyMemberhtgc:CollateralTypeConcentrationRiskMemberhtgc:SeniorSecuredFirstLienMember2022-01-012022-12-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:FebruaryTwoThousandTwentyFiveNotesMember2023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:SustainableAndRenewableTechnologyMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMember2023-03-310001280784htgc:UnfundedDebtCommitmentsMember2023-01-012023-03-310001280784htgc:MarchTwoThousandTwentySixBNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310001280784Warrant Investments and Drug Discovery & Development and Kineta, Inc., Warrant, Acquisition Date 12/20/2019, Common Stock2022-12-310001280784Warrant Investments and Consumer & Business Services and Snagajob.com, Inc., Warrant, Acquisition Date 4/20/2020, Common Stock2023-03-310001280784htgc:AdviserSubsidiaryMember2022-03-310001280784htgc:DepreciationMemberus-gaap:FairValueInputsLevel3Memberhtgc:PreferredStockInvestmentMember2022-01-012022-03-310001280784Equity Investments Drug Discovery & Development and Tarsus Pharmaceuticals, Inc., Equity, Acquisition Date 5/5/2022, Series Common Stock2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:CoronadoAestheticsLLCMemberus-gaap:PreferredStockMemberhtgc:MajorityOwnedControlInvestmentsMember2021-12-310001280784htgc:DebtInvestmentsMemberhtgc:ThreatConnectIncMember2023-03-310001280784htgc:SeniorSecuredDebtMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:BabelStreetMember2022-12-310001280784Warrant Investments and Electronics & Computer Hardware and Locus Robotics Corp., Warrant, Acquisition Date 6/21/2022, Common Stock2023-03-310001280784us-gaap:WarrantMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputMarketEquityAdjustmentMembersrt:WeightedAverageMember2023-03-310001280784Equity Investments Sustainable and Renewable Technology and Modumetal, Inc., Equity, Acquisition Date 6/1/2015, Series Common Stock2023-03-310001280784Debt Investments Consumer & Business Services and Provi, Senior Secured, Maturity Date December 2026, Prime + 4.40%, Floor rate 10.65%, 2.95% Exit Fee2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:ConsumerAndBusinessServicesMember2022-01-012022-12-310001280784Warrant Investments and Software and Lightbend, Inc., Warrant, Acquisition Date 2/14/2018, Preferred Series 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Fee2023-03-310001280784us-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MarketComparableCompaniesMember2022-12-310001280784Equity Investments Surgical Devices and Gynesonics, Inc., Equity, Acquisition Date 7/14/2015, Series Preferred Series E2023-03-310001280784htgc:DiscountsAmortizationMember2022-01-012022-03-310001280784htgc:JanuaryTwoThousandTwentySevenNotesMember2022-12-310001280784htgc:InvestmentFundsAndVehiclesMember2023-03-310001280784Warrant Investments and Consumer & Business Services and Skyword, Inc., Warrant, Acquisition Date 11/14/2022, Common 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Gynesonics, Inc., Equity, Acquisition Date 7/14/2015, Series Preferred Series E2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:LocusRoboticsCorporationMember2022-12-310001280784Debt Investments Semiconductors and Fungible, Inc. Senior Secured, Maturity Date December 2024, Prime + 5.00%, Floor rate 8.25%, 4.95% Exit Fee2022-12-310001280784Equity Investments Software and Druva Holdings, Inc., Equity, Acquisition Date 8/24/2017, Series Preferred Series 32022-12-310001280784Warrant Investments and Information Services and Capella Space Corp., Warrant, Acquisition Date 10/21/2021, Common Stock2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:CoronadoAestheticsLLCMemberus-gaap:SeriesAPreferredStockMemberhtgc:MedicalDevicesAndEquipmentMemberhtgc:MajorityOwnedControlInvestmentsMember2022-12-310001280784Warrant Investments and Drug Discovery & Development and Madrigal Pharmaceutical, Inc., Warrant, Acquisition Date 5/9/2022, Common Stock2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:MobileSolutionsServicesMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtMemberhtgc:ConsumerAndBusinessServicesMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-03-310001280784htgc:NotesMember2018-09-240001280784us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-03-310001280784Debt Investments Consumer & Business Services and Rhino Labs, Inc. Senior Secured, Maturity Date March 2024, Prime + 5.50%, Floor rate 8.75%, PIK Interest 2.25%2022-12-310001280784htgc:IndustrySubSectorConcentrationRiskMemberus-gaap:SalesRevenueNetMemberhtgc:BiotechnologyToolsMember2022-01-012022-12-310001280784Warrant Investments and Information Services and Signal Media Limited, Warrant, Acquisition Date 6/29/2022, Common Stock2022-12-310001280784Equity Investments Software and Druva Holdings, Inc., Equity, Acquisition Date 10/22/2015, Series Preferred Series 22023-03-310001280784Debt Investments Software and Riviera Partners LLC, Senior Secured, Maturity Date April 2027, 6-month SOFR + 7.53%, Floor rate 8.53%2022-12-310001280784us-gaap:FairValueInputsLevel3Memberus-gaap:DebtMemberhtgc:AppreciationMember2022-01-012022-03-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:TwoThousandThirtyThreeNotesMember2022-01-012022-03-310001280784htgc:TwoThousandThirtyThreeNotesMember2022-01-012022-03-310001280784Debt Investments Healthcare Services, Other and Blue Sprig Pediatrics, Inc. 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Senior Secured, Maturity Date March 2026, Prime + 4.35%, Floor rate 7.60%, PIK Interest 1.25%, 4.50% Exit Fee2022-12-310001280784us-gaap:CommonStockMemberhtgc:EquityInvestmentsMember2023-03-310001280784htgc:AdviserFundsMember2023-03-310001280784Warrant Investments and Drug Discovery & Development and Scynexis, Inc., Warrant, Acquisition Date 5/14/2021, Common Stock2023-03-310001280784htgc:MeasurementInputsProbabilityWeightingOfAlternativeOutcomesMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMember2022-12-310001280784Equity Investments Diversified Financial Services (2.75%)2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:ThumbtackIncorporationMember2022-12-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMemberhtgc:MeasurementInputHypotheticalMarketYieldMembersrt:WeightedAverageMemberhtgc:TechnologyMember2022-12-310001280784us-gaap:EquitySecuritiesMemberhtgc:ValuationTechniqueOtherMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:PreferredStockMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2023-01-012023-03-310001280784Investments (208.82%)2023-03-310001280784Warrant Investments and Diversified Financial Services (0.01%)2023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMemberhtgc:TechnologyMember2023-03-310001280784htgc:JulyTwoThousandTwentyFourNotesMember2022-12-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:MarchTwoThousandTwentySixBNotesMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberhtgc:AlladaptImmunotherapeuticsincMember2023-03-310001280784Warrant Investments and Surgical Devices and TransMedics Group, Inc., Warrant, Acquisition Date 9/11/2015, Common Stock2023-03-310001280784htgc:JuneTwoThousandTwentyFiveThreeYearNotesMember2023-03-310001280784htgc:CommonStockParValueZeroPointZeroZeroOnePerShareMember2023-01-012023-03-310001280784Equity Investments Consumer & Business Services and DoorDash, Inc., Equity, Acquisition Date 12/20/2018, Series Common Stock2023-03-310001280784Warrant Investments and Sustainable and Renewable Technology and Fulcrum Bioenergy, Inc., Warrant, Acquisition Date 4/30/2013, Preferred Series C-12022-12-310001280784Equity Investments and Drug Discovery & Development and BridgeBio Pharma, Inc., Equity, Acquisition Date 6/21/2018, Series Common Stock2022-12-310001280784htgc:RecurringFeeIncomeMember2023-01-012023-03-310001280784htgc:SBADebenturesIssuedOnNovemberThirtyTwoThousandAndTwentyOneMember2023-01-012023-03-310001280784htgc:DebtInvestmentsMemberus-gaap:FairValueInputsLevel3Member2023-03-310001280784us-gaap:RevolvingCreditFacilityMember2022-01-012022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerNoncontrolledMember2023-01-012023-03-310001280784htgc:JuneTwoThousandTwentyFiveThreeYearNotesMember2023-01-012023-03-310001280784htgc:OtherInterestIncomeMember2023-01-012023-03-310001280784Warrant Investments and Drug Discovery & Development and Dermavant Sciences Ltd., Warrant, Acquisition Date 5/31/2019, Common Stock2023-03-310001280784Warrant Investments and Electronics & Computer Hardware and Skydio, Inc., Warrant, Acquisition Date 11/08/2021, Common Stock2023-03-310001280784htgc:SoftwareMember2023-03-310001280784Equity Investments Drug Discovery & Development and BridgeBio Pharma, Inc., Equity, Acquisition Date 6/21/2018, Series Common Stock2023-03-310001280784Equity Investments Consumer & Business Services and Nerdy Inc., Equity, Acquisition Date 9/17/2021, Series Common Stock2022-12-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:MajorityOwnedControlInvestmentsMember2021-12-310001280784us-gaap:SubsequentEventMemberhtgc:BaseDividendMember2023-05-230001280784Debt Investments Consumer & Business Services and Modern Life, Inc. Senior Secured, Maturity Date February 2027, Prime + 2.75%, Floor rate 8.75%, 5.00% Exit Fee2023-03-310001280784htgc:BiotechnologyToolsMember2022-12-310001280784us-gaap:WarrantMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMember2023-03-310001280784us-gaap:WarrantMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784htgc:DividendDeclaredEightMember2022-01-012022-12-310001280784htgc:DebtInvestmentsMemberhtgc:ProventionBioIncMember2022-12-310001280784Equity Investments Software and Black Crow AI, Inc. affiliates, Equity, Acquisition Date 3/24/2021, Series Preferred Note2022-12-310001280784Equity Investments Consumer & Business Services and Uber Technologies, Inc., Acquisition Date 12/1/2020, Series Common Stock2022-12-310001280784htgc:MarchTwoThousandTwentySixBNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-03-310001280784htgc:UnusedFacilityOtherFeesMemberhtgc:JanuaryTwoThousandTwentySevenNotesMember2023-01-012023-03-310001280784htgc:SBADebenturesIssuedOnJuneTwentyFiveTwoThousandAndTwentyOneMember2023-03-310001280784Equity Investments Drug Delivery and Aytu BioScience, Inc., Equity, Acquisition Date 3/28/2014, Series Common Stock2022-12-310001280784Equity Investments Surgical Devices (0.24%)2023-03-310001280784htgc:CapitalInExcessOfParValueMember2022-03-310001280784htgc:CapitalInExcessOfParValueMember2023-03-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMembersrt:WeightedAverageMember2022-12-310001280784Equity Investments Consumer & Business Services and Lyft, Inc., Equity, Acquisition Date 12/26/2018, Series Common Stock2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Memberhtgc:TechnologyMember2023-03-310001280784htgc:HerculesAdviserLLCMemberus-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberus-gaap:UnsecuredDebtMemberhtgc:MajorityOwnedControlInvestmentsMember2023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:InvestmentTypeConcentrationRiskMemberhtgc:SeniorSecuredDebtMember2023-01-012023-03-310001280784Warrant Investments and Surgical Devices and Gynesonics, Inc., Warrant, Acquisition Date 1/16/2013, Preferred Series C2022-12-310001280784Warrant Investments and Medical Devices & Equipment (0.07%)2022-12-310001280784us-gaap:FairValueInputsLevel1Memberus-gaap:MoneyMarketFundsMemberus-gaap:FairValueMeasurementsRecurringMember2023-03-310001280784htgc:SemiconductorsMember2022-12-310001280784htgc:HealthcareServicesOtherMember2022-12-310001280784Debt Investments Software and Enmark Systems, Inc., Senior Secured, Maturity Date September 2026, 3-month LIBOR + 6.76%, Floor rate 7.76%, PIK Interest 2.15%2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:MeasurementInputHypotheticalMarketYieldMemberhtgc:ValuationTechniqueMarketComparableCompaniesMember2023-03-310001280784htgc:DistributableEarningsLossMember2022-03-310001280784us-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMembercountry:IL2023-01-012023-03-310001280784Debt Investments Software and Convoy, Inc., Senior Secured, Maturity Date March 2026, Prime + 3.20%, Floor rate 6.45%, PIK Interest 1.95%, 4.55% Exit Fee2023-03-310001280784htgc:SMBCFacilityMember2023-03-310001280784Equity Investments Drug Discovery & Development and Applied Molecular Transport, Equity, Acquisition Date 4/6/2021, Series Common Stock2023-03-310001280784us-gaap:SalesRevenueNetMemberhtgc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001280784Debt Investments Information 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1/18/2007, Series Preferred Series B2023-03-310001280784country:CA2022-12-310001280784us-gaap:CarryingReportedAmountFairValueDisclosureMemberhtgc:JanuaryTwoThousandTwentySevenNotesMember2023-03-310001280784htgc:SustainableAndRenewableTechnologyMember2022-12-310001280784Debt Investments Sustainable and Renewable Technology and Pineapple Energy LLC, Senior Secured, Maturity Date December 2024, PIK Interest 10.00%2023-03-310001280784htgc:TaxableSubsidiaryMember2022-01-012022-12-310001280784htgc:MeasurementInputPremiumDiscountMemberhtgc:DebtInvestmentsMemberhtgc:LowerMiddleMarketMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberhtgc:ValuationTechniqueMarketComparableCompaniesMember2022-12-310001280784Debt Investments Electronics & Computer Hardware (1.27%)2023-03-310001280784Debt Investments Drug Discovery & Development and G1 Therapeutics, Inc. Senior Secured, Maturity Date November 2026, Prime + 5.90%, Floor rate 9.15%, 9.86% Exit Fee2023-03-310001280784htgc:SBADebenturesIssuedOnNovemberFifteenTwoThousandAndTwentyOneMember2023-03-310001280784us-gaap-supplement:InvestmentAffiliatedIssuerControlledMemberhtgc:SeniorSecuredDebtMemberhtgc:OtherControlInvestmentsMemberhtgc:TecturaCorporationMember2021-12-310001280784us-gaap:EquitySecuritiesMemberhtgc:ValuationTechniqueLiquidationMemberus-gaap:FairValueInputsLevel3Member2022-12-310001280784htgc:DividendDeclaredSixMember2022-01-012022-12-310001280784Warrant Investments and Drug Discovery & Development and Century Therapeutics, Inc., Warrant, Acquisition Date 9/14/2020, Common Stock2022-12-310001280784Debt Investments Healthcare Services, Other and Oak Street Health, Inc. Senior Secured, Maturity Date October 2027, Prime + 2.45%, Floor rate 7.95%, Cap rate 9.45%, PIK Interest 1.00%, 4.95% Exit Fee2022-12-310001280784Equity Investments Consumer & Business Services and Carwow LTD, Equity, Acquisition Date 12/15/2021, Series Preferred Series D-42023-03-310001280784Warrant Investments and Drug Discovery & Development and Myovant Sciences, Ltd., Warrant, Acquisition Date 10/16/2017, Common Stock2022-12-310001280784Debt Investments Software and Dispatch Technologies, Inc., Senior Secured, Maturity Date April 2028, 3-month SOFR + 8.01%, Floor rate 8.76%2022-12-310001280784Warrant Investments and Semiconductors and Fungible, Inc., Warrant, Acquisition Date 12/16/2021, Common Stock2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:BrainCorporationMember2023-03-310001280784Debt Investments Software and Alchemer LLC, Senior Secured, Maturity Date May 2028, 1-month SOFR + 8.14%, Floor rate 9.14%2023-03-310001280784Debt Investments Consumer & Business Services and Rhino Labs, Inc. Senior Secured, Maturity Date March 2024, Prime + 5.50%, Floor rate 8.75%, PIK Interest 2.25%2023-03-310001280784Debt Investments Drug Discovery & Development and Kura Oncology, Inc. 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Senior Secured, Maturity Date October 2026, Prime + 4.20%, Floor rate 7.45%, Cap rate 8.95%, 6.00% Exit Fee2023-03-310001280784Equity Investments Consumer & Business Products (0.03%)2023-03-310001280784htgc:DebtInvestmentsMemberhtgc:ProventionBioIncMember2023-03-310001280784Warrant Investments and Medical Devices & Equipment and Outset Medical, Inc., Warrant, Acquisition Date 9/27/2013, Common Stock2022-12-310001280784htgc:DebtInvestmentsMemberhtgc:NuvoloTechnologiesCorporationMember2023-03-310001280784htgc:MedicalDevicesAndEquipmentMember2023-03-310001280784htgc:LiabilityClassifiedAwardsMember2022-03-310001280784Warrant Investments and Drug Discovery & Development and Tricida, Inc., Warrant, Acquisition Date 3/27/2019, Common Stock2023-03-310001280784Debt Investments Drug Discovery & Development and Provention Bio, Inc. 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