XML 55 R43.htm IDEA: XBRL DOCUMENT
v3.23.1

Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value |  | $ 3,130,178 |  |  | $ 2,963,955 |  |
Interest Income |  | 99,897 |  | $ 62,252 |  |  |
Fee Income |  | 5,193 |  | 2,905 |  |  |
Total net change in unrealized appreciation (depreciation) |  | 21,105 |  | (36,742) |  |  |
Total net realized gain (loss) |  | 7,960 |  | (2,381) |  |  |
Control & Affiliate Investments |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1] |  |  | 81,107 |  |  |
Investment, Affiliated Issuer [Member] |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value |  |  |  | 81,107 |  |  | $ 82,962
Total net change in unrealized appreciation (depreciation) |  |  |  | 2,207 |  |  |
Total net realized gain (loss) |  |  |  | 3,772 |  |  |
Investment, Affiliated Issuer [Member] | Control & Affiliate Investments |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Interest Income | [1] |  |  | 2,162 |  |  |
Fee Income | [1] |  |  | 16 |  |  |
Total net change in unrealized appreciation (depreciation) | [1] |  |  | 2,207 |  |  |
Total net realized gain (loss) | [1] |  |  | 3,772 |  |  |
Investment, Affiliated Issuer, Controlled [Member] |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value |  | 85,326 | [2] | 76,277 | $ 76,458 | [3] | 73,504
Interest Income |  | 1,116 |  | 1,115 |  |  |
Fee Income |  | 19 |  | 16 |  |  |
Total net change in unrealized appreciation (depreciation) |  | 8,846 |  | 1,454 |  |  |
Total net realized gain (loss) |  | 0 |  | 0 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Control Investments |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1] | 85,326 |  | 76,277 |  |  |
Interest Income | [1] | 1,116 |  | 1,115 |  |  |
Fee Income | [1] | 19 |  | 16 |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | 8,846 |  | 1,454 |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Coronado Aesthetics, LLC |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1] | 256 |  | 614 |  |  |
Interest Income | [1] | 0 |  | 0 |  |  |
Fee Income | [1] | 0 |  | 0 |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | (63) |  | 49 |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital, LLC |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1] | 40,701 |  | 42,622 |  |  |
Interest Income | [1] | 796 |  | 834 |  |  |
Fee Income | [1] | 19 |  | 16 |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | 3,735 |  | (1,227) |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Hercules Adviser LLC |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1] | 36,595 |  | 24,694 |  |  |
Interest Income | [1] | 150 |  | 111 |  |  |
Fee Income | [1] | 0 |  | 0 |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | 5,442 |  | 2,554 |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Tectura Corporation |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1] | 7,774 |  | 8,347 |  |  |
Interest Income | [1] | 170 |  | 170 |  |  |
Fee Income | [1] | 0 |  | 0 |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | (268) |  | 78 |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value |  |  |  | 4,830 |  |  | $ 9,458
Interest Income |  | 0 |  | 1,047 |  |  |
Total net change in unrealized appreciation (depreciation) |  | 0 |  | 753 |  |  |
Total net realized gain (loss) |  | $ 0 |  | 3,772 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Affiliate Investments |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1],[4] |  |  | 4,830 |  |  |
Interest Income | [1],[4] |  |  | 1,047 |  |  |
Fee Income | [1],[4] |  |  | 0 |  |  |
Total net change in unrealized appreciation (depreciation) | [1],[4] |  |  | 753 |  |  |
Total net realized gain (loss) | [1],[4] |  |  | 3,772 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Black Crow AI, Inc. affiliates |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1],[4] |  |  | 0 |  |  |
Interest Income | [1],[4] |  |  | 0 |  |  |
Fee Income | [1],[4] |  |  | 0 |  |  |
Total net change in unrealized appreciation (depreciation) | [1],[4] |  |  | (120) |  |  |
Total net realized gain (loss) | [1],[4] |  |  | 3,772 |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Pineapple Energy LLC |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Total investments, at fair value | [1],[4] |  |  | 4,830 |  |  |
Interest Income | [1],[4] |  |  | 1,047 |  |  |
Fee Income | [1],[4] |  |  | 0 |  |  |
Total net change in unrealized appreciation (depreciation) | [1],[4] |  |  | 873 |  |  |
Total net realized gain (loss) | [1],[4] |  |  | $ 0 |  |  |
[1] | In accordance with Rules 3-09, 4-08(g), and Rule 10-01(b)(1) of Regulation S-X, (“Rule 3-09”, “Rule 4-08(g)”, and “Rule 10-01(b)(1)”, respectively), the Company must determine if its unconsolidated subsidiaries are considered “significant subsidiaries”. As of March 31, 2023 and March 31, 2022, there were no unconsolidated subsidiaries that are considered “significant subsidiaries”.
[2] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[3] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[4] | As of September 30, 2022, Black Crow AI, Inc. and Pineapple Energy LLC were no longer affiliates as defined under the 1940 Act.

X
- References No definition available. + Details
Name: | us-gaap-supplement_FeeIncome
Namespace Prefix: | us-gaap-supplement_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_InterestIncomeOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: 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 C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
Name: | us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
Name: | us-gaap_RealizedInvestmentGainsLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=htgc_ControlAndAffiliateInvestmentsMember
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: |

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_ControlInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=htgc_CoronadoAestheticsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=htgc_GibraltarBusinessCapitalLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=htgc_HerculesAdviserLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=htgc_TecturaCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=htgc_BlackCrowAIIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=htgc_PineappleEnergyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |