XML 56 R43.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Investments - Schedule of Fair Value Portfolio of Investments by Geographic Location (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 2,825,738 | $ 2,434,522
United States |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 2,545,973 | 2,138,184
United Kingdom |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 158,491 | 169,407
Netherlands |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 88,174 | 82,925
Canada |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 19,373 | 27,673
Israel |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 9,005 | 8,980
Ireland |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 3,313 | 5,459
Germany |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 924 | 1,894
Other |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 485 | $ 0
Geographic Concentration Risk [Member] | Revenue Benchmark |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 100.00% | 100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | United States |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 90.10% | 87.80%
Geographic Concentration Risk [Member] | Revenue Benchmark | United Kingdom |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 5.60% | 7.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | Netherlands |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 3.10% | 3.40%
Geographic Concentration Risk [Member] | Revenue Benchmark | Canada |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.70% | 1.10%
Geographic Concentration Risk [Member] | Revenue Benchmark | Israel |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.30% | 0.40%
Geographic Concentration Risk [Member] | Revenue Benchmark | Ireland |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.10% | 0.20%
Geographic Concentration Risk [Member] | Revenue Benchmark | Germany |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.10% | 0.10%
Geographic Concentration Risk [Member] | Revenue Benchmark | Other |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.00%

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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 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
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_NL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_IL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_IE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_DE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=htgc_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |