XML 92 R80.htm IDEA: XBRL DOCUMENT
v3.25.3

Commitments and Contingencies - Schedule of Unencumbered Unfunded Commitments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Commitments And Contingencies [Line Items] |  |
Total Unfunded Debt Commitments | $ 437,535 | $ 448,528
Debt investments |  |
Commitments And Contingencies [Line Items] |  |
2025 | 84,424 | 251,941
2026 | 250,676 | 147,840
2027 | 36,649 | 10,553
2028 | 4,547 | 6,040
2029 | 19,731 | 24,149
2030 | 33,276 | 4,176
2031 | 4,840 | 0
Total Unfunded Debt Commitments | 434,143 | 444,699
Investment Funds & Vehicles |  |
Commitments And Contingencies [Line Items] |  |
2030 | 1,775 | 1,757
2032 | 1,617 | 2,072
Total Unfunded Debt Commitments | $ 3,392 | $ 3,829

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | htgc_CommitmentsAndContingenciesLineItems
Namespace Prefix: | htgc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unfunded Commitments Due In Eighth Year + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInEighthYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded commitments due in fifth year. + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInFifthYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded commitments due in fourth year. + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInFourthYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded commitments due in remainder of fiscal year. + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInRemainderOfFiscalYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded commitments due in second year. + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInSecondYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded Commitments Due In Seventh Year + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInSeventhYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded commitments due in sixth year. + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInSixthYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded commitments due in third year. + References No definition available. + Details
Name: | htgc_UnfundedCommitmentsDueInThirdYear
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of financial support committed by investment company to investee that is contractually required but not provided. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-16 + Details
Name: | us-gaap_InvestmentCompanyFinancialCommitmentToInvesteeFutureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialSupportToNonconsolidatedLegalEntityAxis=htgc_DebtInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialSupportToNonconsolidatedLegalEntityAxis=htgc_InvestmentFundsAndVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |