XML 91 R80.htm IDEA: XBRL DOCUMENT
v3.23.3

CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of schedule of investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating | $ 116,744 | $ 84,229 | $ 338,065 | $ 221,501 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 2,963,955 |  |
Net Change in Unrealized Appreciation (Depreciation) | (46,240) | (2,089) | (6,277) | (87,147) |
Investments, fair value, ending balance | 3,261,391 |  | 3,261,391 |  | $ 2,963,955
Investment cost | 3,308,894 |  | 3,308,894 |  | 3,005,696
Investments, at fair value: | 3,261,391 |  | 3,261,391 |  | 2,963,955
Control investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | 3,330 | 3,490 |
Realized Gain (Loss) | 0 | 0 | 0 | 0 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 76,458 | 73,504 | 73,504
Gross Additions |  |  | 14,372 | 3,210 |
Net Change in Unrealized Appreciation (Depreciation) | (1,099) | (2,571) | 12,320 | 3,611 |
Investments, fair value, ending balance | $ 103,150 | 80,325 | $ 103,150 | 80,325 | $ 76,458
Investment owned, percent of net assets | 6.24% |  | 6.24% |  | 5.46%
Investment cost | $ 101,643 |  | $ 101,643 |  | $ 87,271
Investments, at fair value: | 103,150 | 80,325 | 103,150 | 80,325 | 76,458
Control investments | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | 2,814 | 2,974 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 68,416 | 65,235 | 65,235
Gross Additions |  |  | 14,372 | 3,210 |
Net Change in Unrealized Appreciation (Depreciation) |  |  | 14,119 | 3,562 |
Investments, fair value, ending balance | $ 96,907 | 72,007 | $ 96,907 | 72,007 | $ 68,416
Investment owned, percent of net assets | 5.87% |  | 5.87% |  | 4.88%
Investment cost | $ 79,230 |  | $ 79,230 |  | $ 64,858
Investments, at fair value: | 96,907 | 72,007 | 96,907 | 72,007 | 68,416
Control investments | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | 516 | 516 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 8,042 | 8,269 | 8,269
Net Change in Unrealized Appreciation (Depreciation) |  |  | (1,799) | 49 |
Investments, fair value, ending balance | $ 6,243 | 8,318 | $ 6,243 | 8,318 | $ 8,042
Investment owned, percent of net assets | 0.37% |  | 0.37% |  | 0.58%
Investment cost | $ 22,413 |  | $ 22,413 |  | $ 22,413
Investments, at fair value: | 6,243 | 8,318 | 6,243 | 8,318 | 8,042
Control investments | Hercules Adviser LLC |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | 1,507 | (1,236) | 9,515 | 9,955 |
Investments, fair value, ending balance | 40,668 | 33,945 | 40,668 | 33,945 |
Investments, at fair value: | 40,668 | 33,945 | 40,668 | 33,945 |
Control investments | Hercules Adviser LLC | Member Units | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 19,153 | 11,990 | 11,990
Net Change in Unrealized Appreciation (Depreciation) |  |  | 9,515 | 9,955 |
Investments, fair value, ending balance | 28,668 | 21,945 | 28,668 | 21,945 | 19,153
Investments, at fair value: | 28,668 | 21,945 | 28,668 | 21,945 | 19,153
Control investments | Coronado Aesthetics, LLC |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | (50) | (22) | (72) | (165) |
Investments, fair value, ending balance | 247 | 400 | 247 | 400 |
Investments, at fair value: | 247 | 400 | 247 | 400 |
Control investments | Coronado Aesthetics, LLC | Common Stock | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 6 | 65 | 65
Net Change in Unrealized Appreciation (Depreciation) |  |  | (4) | (56) |
Investments, fair value, ending balance | 2 | 9 | 2 | 9 | 6
Investments, at fair value: | 2 | 9 | 2 | 9 | 6
Control investments | Coronado Aesthetics, LLC | Preferred Stock | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 313 | 500 | 500
Net Change in Unrealized Appreciation (Depreciation) |  |  | (68) | (109) |
Investments, fair value, ending balance | 245 | 391 | 245 | 391 | 313
Investments, at fair value: | 245 | 391 | 245 | 391 | 313
Control investments | Tectura Corporation |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | (830) | 110 | (1,799) | 49 |
Investments, fair value, ending balance | 6,243 | 8,318 | 6,243 | 8,318 |
Investments, at fair value: | 6,243 | 8,318 | 6,243 | 8,318 |
Control investments | Gibraltar Business Capital, LLC |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | (1,726) | (1,423) | 4,676 | (6,228) |
Investments, fair value, ending balance | 55,992 | 37,662 | 55,992 | 37,662 |
Investments, at fair value: | 55,992 | 37,662 | 55,992 | 37,662 |
Control investments | Gibraltar Business Capital, LLC | Common Stock | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  |  | 1,225 | 1,225
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | (91) |
Investments, fair value, ending balance |  | 1,134 |  | 1,134 |
Investments, at fair value: |  | 1,134 |  | 1,134 |
Control investments | Gibraltar Business Capital, LLC | Preferred Stock | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  |  | 19,393 | 19,393
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | (4,904) |
Investments, fair value, ending balance |  | 14,489 |  | 14,489 |
Investments, at fair value: |  | 14,489 |  | 14,489 |
Control investments | Gibraltar Business Capital, LLC | Member Units | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 15,244 |  |
Gross Additions |  |  | 4,500 |  |
Net Change in Unrealized Appreciation (Depreciation) |  |  | 1,809 |  |
Investments, fair value, ending balance | 21,553 |  | 21,553 |  | 15,244
Investments, at fair value: | 21,553 |  | 21,553 |  | 15,244
Control investments | Medical Devices & Equipment | Coronado Aesthetics, LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 319 |  |
Investments, fair value, ending balance | 247 |  | 247 |  | 319
Investment cost | 250 |  | 250 |  | 250
Investments, at fair value: | 247 |  | 247 |  | 319
Control investments | Medical Devices & Equipment | Coronado Aesthetics, LLC | Common Stock | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 6 |  |
Investments, fair value, ending balance | $ 2 |  | $ 2 |  | $ 6
Shares | 180,000 |  | 180,000 |  | 180,000
Investment cost | $ 0 |  | $ 0 |  | $ 0
Investments, at fair value: | 2 |  | 2 |  | 6
Control investments | Medical Devices & Equipment | Coronado Aesthetics, LLC | Preferred Stock | Preferred Series A | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 313 |  |
Investments, fair value, ending balance | $ 245 |  | $ 245 |  | $ 313
Shares | 5,000,000 |  | 5,000,000 |  | 5,000,000
Investment cost | $ 250 |  | $ 250 |  | $ 250
Investments, at fair value: | 245 |  | 245 |  | 313
Control investments | Diversified Financial Services | Hercules Adviser LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 31,153 |  |
Investments, fair value, ending balance | 40,668 |  | 40,668 |  | 31,153
Investment cost | 12,035 |  | 12,035 |  | 12,035
Investments, at fair value: | 40,668 |  | 40,668 |  | 31,153
Control investments | Diversified Financial Services | Hercules Adviser LLC | Member Units | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 19,153 |  |
Investments, fair value, ending balance | $ 28,668 |  | $ 28,668 |  | $ 19,153
Shares | 1 |  | 1 |  | 1
Investment cost | $ 35 |  | $ 35 |  | $ 35
Investments, at fair value: | 28,668 |  | 28,668 |  | 19,153
Control investments | Diversified Financial Services | Gibraltar Business Capital, LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 36,944 |  |
Investments, fair value, ending balance | 55,992 |  | 55,992 |  | 36,944
Investment cost | 66,945 |  | 66,945 |  | 52,573
Investments, at fair value: | 55,992 |  | 55,992 |  | 36,944
Control investments | Diversified Financial Services | Gibraltar Business Capital, LLC | Common Stock | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 1,107 |  |
Investments, fair value, ending balance |  |  |  |  | $ 1,107
Shares |  |  |  |  | 830,000
Investment cost |  |  |  |  | $ 1,884
Investments, at fair value: |  |  |  |  | 1,107
Control investments | Diversified Financial Services | Gibraltar Business Capital, LLC | Preferred Stock | Preferred Series A | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 14,137 |  |
Investments, fair value, ending balance |  |  |  |  | $ 14,137
Shares |  |  |  |  | 10,602,752
Investment cost |  |  |  |  | $ 26,122
Investments, at fair value: |  |  |  |  | 14,137
Control investments | Diversified Financial Services | Gibraltar Business Capital, LLC | Member Units | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, ending balance | $ 21,553 |  | $ 21,553 |  |
Shares | 1 |  | 1 |  |
Investment cost | $ 32,506 |  | $ 32,506 |  |
Investments, at fair value: | 21,553 |  | 21,553 |  |
Control investments | Consumer & Business Services | Tectura Corporation | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 8,042 |  |
Investments, fair value, ending balance | 6,243 |  | 6,243 |  | 8,042
Investment cost | 22,413 |  | 22,413 |  | 22,413
Investments, at fair value: | 6,243 |  | 6,243 |  | 8,042
Control investments | Consumer & Business Services | Tectura Corporation | Common Stock | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 0 |  |
Investments, fair value, ending balance | $ 0 |  | $ 0 |  | $ 0
Shares | 414,994,863 |  | 414,994,863 |  | 414,994,863
Investment cost | $ 900 |  | $ 900 |  | $ 900
Investments, at fair value: | 0 |  | 0 |  | 0
Control investments | Consumer & Business Services | Tectura Corporation | Preferred Stock | Preferred Series BB | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 0 |  |
Investments, fair value, ending balance | $ 0 |  | $ 0 |  | $ 0
Shares | 1,000,000 |  | 1,000,000 |  | 1,000,000
Investment cost | $ 0 |  | $ 0 |  | $ 0
Investments, at fair value: | 0 |  | 0 |  | 0
Control investments | Senior Secured Debt | Tectura Corporation | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | 516 | 516 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 8,042 | 8,269 | 8,269
Net Change in Unrealized Appreciation (Depreciation) |  |  | (1,799) | 49 |
Investments, fair value, ending balance | 6,243 | 8,318 | 6,243 | 8,318 | 8,042
Investments, at fair value: | 6,243 | 8,318 | 6,243 | 8,318 | 8,042
Control investments | Senior Secured Debt | Consumer & Business Services | Tectura Corporation | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 0 |  |
Investments, fair value, ending balance | $ 0 |  | $ 0 |  | $ 0
Maturity Date |  |  | 2024-07 |  | 2024-07
Investment, interest rate, paid in kind | 5.00% |  | 5.00% |  | 5.00%
Principal amount | $ 23,703 |  | $ 23,703 |  | $ 10,680
Investment cost | 13,263 |  | 13,263 |  | 240
Investments, at fair value: | 0 |  | 0 |  | 0
Control investments | Unsecured Debt | Hercules Adviser LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | 455 | 393 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 12,000 | 8,850 | 8,850
Gross Additions |  |  |  | 3,150 |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | 0 |
Investments, fair value, ending balance | 12,000 | 12,000 | 12,000 | 12,000 | 12,000
Investments, at fair value: | 12,000 | 12,000 | 12,000 | 12,000 | 12,000
Control investments | Unsecured Debt | Gibraltar Business Capital, LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | 2,359 | 2,581 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 21,700 | 23,212 | 23,212
Gross Additions |  |  | 9,872 | 60 |
Net Change in Unrealized Appreciation (Depreciation) |  |  | 2,867 | (1,233) |
Investments, fair value, ending balance | 34,439 | 22,039 | 34,439 | 22,039 | 21,700
Investments, at fair value: | 34,439 | 22,039 | 34,439 | 22,039 | 21,700
Control investments | Unsecured Debt | Diversified Financial Services | Hercules Adviser LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 12,000 |  |
Investments, fair value, ending balance | $ 12,000 |  | $ 12,000 |  | $ 12,000
Maturity Date |  |  | 2025-06 |  | 2025-06
Investment, interest rate, paid in cash | 5.00% |  | 5.00% |  | 5.00%
Principal amount | $ 12,000 |  | $ 12,000 |  | $ 12,000
Investment cost | 12,000 |  | 12,000 |  | 12,000
Investments, at fair value: | 12,000 |  | 12,000 |  | 12,000
Control investments | Unsecured Debt One | Diversified Financial Services | Gibraltar Business Capital, LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 12,802 |  |
Investments, fair value, ending balance | $ 24,638 |  | $ 24,638 |  | $ 12,802
Maturity Date |  |  | 2026-09 |  | 2026-09
Investment, interest rate, paid in cash | 11.50% |  | 11.50% |  | 14.50%
Principal amount | $ 25,000 |  | $ 25,000 |  | $ 15,000
Investment cost | 24,638 |  | 24,638 |  | 14,715
Investments, at fair value: | 24,638 |  | 24,638 |  | 12,802
Control investments | Unsecured Debt Two | Diversified Financial Services | Gibraltar Business Capital, LLC | Majority Owned Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 8,898 |  |
Investments, fair value, ending balance | $ 9,801 |  | $ 9,801 |  | $ 8,898
Maturity Date |  |  | 2026-09 |  | 2026-09
Investment, interest rate, paid in cash | 11.95% |  | 11.95% |  | 11.50%
Principal amount | $ 10,000 |  | $ 10,000 |  | $ 10,000
Investment cost | 9,801 |  | 9,801 |  | 9,852
Investments, at fair value: | 9,801 |  | 9,801 |  | 8,898
Control investments | Senior Secured Debt One | Consumer & Business Services | Tectura Corporation | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 8,042 |  |
Investments, fair value, ending balance | $ 6,243 |  | $ 6,243 |  | $ 8,042
Maturity Date |  |  | 2024-07 |  | 2024-07
Investment, interest rate, paid in cash | 8.25% |  | 8.25% |  | 8.25%
Principal amount | $ 8,250 |  | $ 8,250 |  | $ 8,250
Investment cost | 8,250 |  | 8,250 |  | 8,250
Investments, at fair value: | 6,243 |  | 6,243 |  | 8,042
Control investments | Senior Secured Debt Two | Consumer & Business Services | Tectura Corporation | Other Control Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  | 0 |  |
Investments, fair value, ending balance |  |  |  |  | $ 0
Maturity Date |  |  |  |  | 2024-07
Investment, interest rate, paid in kind |  |  |  |  | 5.00%
Principal amount |  |  |  |  | $ 13,023
Investment cost |  |  |  |  | 13,023
Investments, at fair value: |  |  |  |  | 0
Affiliate investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) | 0 | (2,014) | 0 | 1,758 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | $ 0 | 4,631 | $ 0 | 4,089 |
Affiliate investments | Pineapple Energy LLC |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) |  | (2,014) |  | (2,014) |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  | 4,631 |  | 4,209 |
Investments, fair value, ending balance |  | 0 |  | 0 |
Investments, at fair value: |  | 0 |  | 0 |
Affiliate investments | Black Crow AI, Inc. affiliates |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) |  | 0 |  | 3,772 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) |  | 0 |  | (120) |
Investments, fair value, ending balance |  | 0 |  | 0 |
Investments, at fair value: |  | 0 |  | 0 |
Investment, Affiliated Issuer, Noncontrolled |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  |  | 1,204 |
Realized Gain (Loss) |  |  |  | 1,758 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  |  | 9,458 | 9,458
Gross reductions |  |  |  | (13,547) |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | 4,089 |
Investments, fair value, ending balance |  | 0 |  | 0 |
Investments, at fair value: |  | 0 |  | 0 |
Investment, Affiliated Issuer, Noncontrolled | Pineapple Energy LLC | Common Stock |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  |  | 591 | 591
Gross reductions |  |  |  | (4,767) |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | 4,176 |
Investments, fair value, ending balance |  | 0 |  | 0 |
Investments, at fair value: |  | 0 |  | 0 |
Investment, Affiliated Issuer, Noncontrolled | Black Crow AI, Inc. affiliates | Preferred Stock |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Realized Gain (Loss) |  |  |  | 3,772 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  |  | 1,120 | 1,120
Gross reductions |  |  |  | (1,000) |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | (120) |
Investments, fair value, ending balance |  | 0 |  | 0 |
Investments, at fair value: |  | 0 |  | 0 |
Investment, Affiliated Issuer, Noncontrolled | Senior Secured Debt | Pineapple Energy LLC |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  |  | 1,204 |
Realized Gain (Loss) |  |  |  | (2,014) |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  |  | 7,747 | 7,747
Gross reductions |  |  |  | (7,780) |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | 33 |
Investments, fair value, ending balance |  | 0 |  | 0 |
Investments, at fair value: |  | 0 |  | 0 |
Investment, Affiliated Issuer And Controlled Issuer |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  |  | 4,694 |
Realized Gain (Loss) |  |  |  | 1,758 |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Investments, fair value, beginning balance |  |  |  | 82,962 | $ 82,962
Gross Additions |  |  |  | 3,210 |
Gross reductions |  |  |  | (13,547) |
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | 7,700 |
Investments, fair value, ending balance |  | 80,325 |  | 80,325 |
Investments, at fair value: |  | $ 80,325 |  | $ 80,325 |

X
- Definition Gross C A additions. + References No definition available. + Details
Name: | htgc_GrossCAAdditions
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross CA reduction. + References No definition available. + Details
Name: | htgc_GrossCaReduction
Namespace Prefix: | htgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment maturity month and year. + References No definition available. + Details
Name: | htgc_InvestmentMaturityMonthAndYear
Namespace Prefix: | htgc_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_GrossInvestmentIncomeOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Rate of interest paid in cash on investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 + Details
Name: | us-gaap_InvestmentInterestRatePaidInCash
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Rate of interest paid in kind on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 2: 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 A)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 3: 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 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 4: 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 A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 + Details
Name: | us-gaap_InvestmentInterestRatePaidInKind
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cost of the investment. + 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//1943274/2147480493/946-210-55-1 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//1943274/2147480524/946-210-50-6 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//1943274/2147480524/946-210-50-6 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-12 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//1943274/2147480524/946-210-50-6 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 Reference 7: 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 8)(a)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 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 11)(a)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 9: 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 5)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 19 -Subparagraph (3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-19 + Details
Name: | us-gaap_InvestmentOwnedAtCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in security owned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-6 Reference 2: 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//1943274/2147480493/946-210-55-1 Reference 3: 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//1943274/2147480524/946-210-50-6 Reference 4: 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//1943274/2147480524/946-210-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-2 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-12 Reference 11: 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//1943274/2147480524/946-210-50-6 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(11)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(2)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 17: 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)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 18: 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 A)(Footnote 1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 19: 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//1943274/2147480032/946-320-S99-1 Reference 20: 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 6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 21: 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)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 22: 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//1943274/2147480032/946-320-S99-3 Reference 23: 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//1943274/2147480032/946-320-S99-3 Reference 24: 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 7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 25: 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 9)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 26: 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)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 27: 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 A)(Footnote 1)(b)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 28: 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 A)(Footnote 1)(b)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 29: 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 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 30: 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//1943274/2147480032/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of principal of investment owned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-6 Reference 2: 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//1943274/2147480493/946-210-55-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 4: 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 B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 5: 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 B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 6: 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 B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedBalancePrincipalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of shares of investment owned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-6 Reference 2: 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//1943274/2147480493/946-210-55-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 4: 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 B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 5: 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 B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 6: 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 B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedBalanceShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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//1943274/2147480493/946-210-55-1 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//1943274/2147480524/946-210-50-6 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//1943274/2147480524/946-210-50-6 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//1943274/2147480524/946-210-50-1 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//1943274/2147480524/946-210-50-6 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//1943274/2147480032/946-320-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//1943274/2147480032/946-320-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//1943274/2147480032/946-320-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//1943274/2147480032/946-320-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//1943274/2147480032/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_InvestmentsInAndAdvancesToAffiliatesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 + Details
Name: | us-gaap_RealizedInvestmentGainsLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- Details
Name: | srt_StatementGeographicalAxis=htgc_OtherControlInvestmentsMember
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: | us-gaap_StatementEquityComponentsAxis=us-gaap_MemberUnitsMember
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: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
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: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=htgc_GibraltarAcquisitionLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=htgc_PreferredSeriesBBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=htgc_SeniorSecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=htgc_UnsecuredDebtOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=htgc_UnsecuredDebtTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=htgc_SeniorSecuredDebtOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=htgc_SeniorSecuredDebtTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentIssuerAffiliationAxis=us-gaap_InvestmentAffiliatedIssuerMember
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: |

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