XML 90 R78.htm IDEA: XBRL DOCUMENT
v3.23.1

Schedule 12-14s - Summary of schedule of investment (Parenthetical) (Details) | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment, Affiliated Issuer, Controlled [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment owned, percent of net assets | [1] | 5.69% | 5.46%
Investment, Affiliated Issuer, Controlled [Member] | Other Control Investments |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment owned, percent of net assets | [1] | 0.52% | 0.58%
Investment, Affiliated Issuer, Controlled [Member] | Majority Owned Control Investments [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment owned, percent of net assets | [1] | 5.17% | 4.88%
Investment, Affiliated Issuer [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment owned, percent of net assets | [1] |  | 5.46%
[1] | * Value as a percent of net assets

X
- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column D)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 + Details
Name: | us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap-supplement_InvestmentIssuerAffiliationAxis=us-gaap-supplement_InvestmentAffiliatedIssuerControlledMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=htgc_OtherControlInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=htgc_MajorityOwnedControlInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap-supplement_InvestmentIssuerAffiliationAxis=us-gaap-supplement_InvestmentAffiliatedIssuerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |