XML 49 R36.htm IDEA: XBRL DOCUMENT
v3.25.2

Consolidated Schedule of Investments (Unaudited) - Investments (Details) (Parentheticals) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
NAV % | 219.40% | 207.60%
Unrestricted Short Term Investments [Member] |  |
NAV % | 18.80% | 8.10%
Restricted Short Term Investments [Member] |  |
NAV % | 1.10% | 1.00%
Investment, Affiliated Issuer, Controlled [Member] |  |
NAV % | 3.70% | 9.50%
Investment, Affiliated Issuer, Controlled [Member] | Debt Securities [Member] |  |
NAV % | 0.30% | 2.30%
Investment, Affiliated Issuer, Controlled [Member] | Other Investments [Member] |  |
NAV % | 0.60% | 1.90%
Investment, Affiliated Issuer, Controlled [Member] | Equity Securities [Member] |  |
NAV % | 2.80% | 5.30%
Investment, Affiliated Issuer, Noncontrolled [Member] | Other Investments [Member] |  |
NAV % | 2.40% | 2.50%
Investment, Affiliated Issuer, Noncontrolled [Member] | Equity Securities [Member] |  |
NAV % | 0.00% | 0.00%
Investment, Affiliated Issuer, Noncontrolled [Member] | Warrant [Member] |  |
NAV % | 0.00% | 0.00%
Investment, Unaffiliated Issuer [Member] |  |
NAV % | 213.30% | 195.60%
Investment, Unaffiliated Issuer [Member] | Debt Securities [Member] |  |
NAV % | 203.80% | 187.70%
Investment, Unaffiliated Issuer [Member] | Debt Securities [Member] | Sustainability Segment [Member] |  |
NAV % | 10.20% | 19.90%
Investment, Unaffiliated Issuer [Member] | Debt Securities [Member] | Life Science Segment [Member] |  |
NAV % | 97.20% | 77.80%
Investment, Unaffiliated Issuer [Member] | Debt Securities [Member] | Technology Sector [Member] |  |
NAV % | 61.00% | 59.00%
Investment, Unaffiliated Issuer [Member] | Debt Securities [Member] | Healthcare Information and Services Segment [Member] |  |
NAV % | 35.40% | 31.00%
Investment, Unaffiliated Issuer [Member] | Other Investments [Member] | Life Science Segment [Member] |  |
NAV % | 0.00% | 0.00%
Investment, Unaffiliated Issuer [Member] | Equity Securities [Member] |  |
NAV % | 1.90% | 2.50%
Investment, Unaffiliated Issuer [Member] | Warrant [Member] |  |
NAV % | 7.60% | 5.40%
Investment, Unaffiliated Issuer [Member] | Warrant [Member] | Sustainability Segment [Member] |  |
NAV % | 0.00% | 0.10%
Investment, Unaffiliated Issuer [Member] | Warrant [Member] | Life Science Segment [Member] |  |
NAV % | 2.10% | 1.90%
Investment, Unaffiliated Issuer [Member] | Warrant [Member] | Technology Sector [Member] |  |
NAV % | 4.40% | 3.10%
Investment, Unaffiliated Issuer [Member] | Warrant [Member] | Healthcare Information and Services Segment [Member] |  |
NAV % | 1.10% | 0.30%

X
- Definition Percentage of investment owned to net assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477439/946-210-55-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=hrzn_UnrestrictedShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=hrzn_RestrictedShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentIssuerAffiliationAxis=us-gaap_InvestmentAffiliatedIssuerControlledMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_OtherInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentIssuerAffiliationAxis=us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentIssuerAffiliationAxis=us-gaap_InvestmentUnaffiliatedIssuerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=hrzn_SustainabilitySegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=hrzn_LifeScienceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_TechnologySectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=hrzn_HealthcareInformationAndServicesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |