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N-2 - $ / shares | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Cover [Abstract] |  |  |  |
Entity Central Index Key | 0001280784 |  |  |
Amendment Flag | false |  |  |
Securities Act File Number | 814-00702 |  |  |
Document Type | 10-Q |  |  |
Entity Registrant Name | HERCULES CAPITAL, INC. |  |  |
Entity Address, Address Line One | 1 North B Street |  |  |
Entity Address, Address Line Two | Suite 2000 |  |  |
Entity Address, City or Town | San Mateo |  |  |
Entity Address, State or Province | CA |  |  |
Entity Address, Postal Zip Code | 94401 |  |  |
City Area Code | 650 |  |  |
Local Phone Number | 289-3060 |  |  |
Entity Emerging Growth Company | false |  |  |
General Description of Registrant [Abstract] |  |  |  |
Risk Factors [Table Text Block] | ITEM 1A. RISK FACTORS In addition to the risks discussed below, important risk factors that could cause results or events to differ from current expectations are described in Part I, Item 1A “Risk Factors” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 filed with the SEC on February 15, 2024 (the “Annual Report”). Our financial results could be negatively affected if a significant portfolio investment fails to perform as expected. Our total investment in companies may be significant individually or in the aggregate. As a result, if a significant investment in one or more companies fails to perform as expected, our financial results could be more negatively affected, and the magnitude of the loss could be more significant than if we had made smaller investments in more companies. The following table shows the fair value of the totals of investments held in portfolio companies as of March 31, 2024 that represent greater than 5% of our net assets:
(in thousands) | March 31, 2024
| Fair Value |  | Percentage of Net Assets
Axsome Therapeutics, Inc. | 162,009 |  |  | 8.6 | %
Marathon Health, LLC | 152,970 |  |  | 8.1 | %
Phathom Pharmaceuticals, Inc. | 137,489 |  |  | 7.3 | %
SeatGeek, Inc. | 109,969 |  |  | 5.8 | %
Corium, Inc. | 109,343 |  |  | 5.8 | %
Worldremit Group Limited | 97,316 |  |  | 5.2 | %
•Axsome Therapeutics, Inc. is a biopharmaceutical company developing novel therapies for the management of central nervous system disorders for which there are limited treatment options. •Marathon Health, LLC is a provider of employer-sponsored healthcare platform intended to provide convenient and unhurried patient-centered care services. •Phathom Pharmaceuticals, Inc. is a biopharmaceutical company focused on the development and commercialization of novel treatments for gastrointestinal diseases and disorders. •SeatGeek, Inc. is a mobile-focused ticket platform that enables users to buy and sell tickets for live sports, concerts and theater events. •Corium, Inc. develops, engineers, and manufactures drug delivery products and devices that utilize the skin and mucosa as a primary means of transport. •Worldremit Group Limited is a global online money transfer business. Our financial results could be materially adversely affected if these portfolio companies or any of our other significant portfolio companies encounter financial difficulty and fail to repay their obligations or to perform as expected. |  |  |
Share Price | $ 18.45 |  | $ 12.89 |
NAV Per Share | $ 11.63 | $ 11.43 | $ 10.82 | $ 10.53
Significant Portfolio Investment [Member] |  |  |  |
General Description of Registrant [Abstract] |  |  |  |
Risk [Text Block] | Our financial results could be negatively affected if a significant portfolio investment fails to perform as expected. Our total investment in companies may be significant individually or in the aggregate. As a result, if a significant investment in one or more companies fails to perform as expected, our financial results could be more negatively affected, and the magnitude of the loss could be more significant than if we had made smaller investments in more companies. The following table shows the fair value of the totals of investments held in portfolio companies as of March 31, 2024 that represent greater than 5% of our net assets:
(in thousands) | March 31, 2024
| Fair Value |  | Percentage of Net Assets
Axsome Therapeutics, Inc. | 162,009 |  |  | 8.6 | %
Marathon Health, LLC | 152,970 |  |  | 8.1 | %
Phathom Pharmaceuticals, Inc. | 137,489 |  |  | 7.3 | %
SeatGeek, Inc. | 109,969 |  |  | 5.8 | %
Corium, Inc. | 109,343 |  |  | 5.8 | %
Worldremit Group Limited | 97,316 |  |  | 5.2 | %
•Axsome Therapeutics, Inc. is a biopharmaceutical company developing novel therapies for the management of central nervous system disorders for which there are limited treatment options. •Marathon Health, LLC is a provider of employer-sponsored healthcare platform intended to provide convenient and unhurried patient-centered care services. •Phathom Pharmaceuticals, Inc. is a biopharmaceutical company focused on the development and commercialization of novel treatments for gastrointestinal diseases and disorders. •SeatGeek, Inc. is a mobile-focused ticket platform that enables users to buy and sell tickets for live sports, concerts and theater events. •Corium, Inc. develops, engineers, and manufactures drug delivery products and devices that utilize the skin and mucosa as a primary means of transport. •Worldremit Group Limited is a global online money transfer business. Our financial results could be materially adversely affected if these portfolio companies or any of our other significant portfolio companies encounter financial difficulty and fail to repay their obligations or to perform as expected. |  |  |

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