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Debt - Schedule of Available and Outstanding Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 10, 2025 | Feb. 05, 2025 | Dec. 31, 2024 | Nov. 26, 2024 | Jul. 09, 2024 | Jun. 23, 2022 | Jun. 22, 2022 | Jan. 20, 2022 | Sep. 16, 2021 | Mar. 04, 2021 | Nov. 04, 2020 | Oct. 27, 2020 | Jun. 03, 2020 | Feb. 05, 2020 | Sep. 24, 2018
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | $ 2,564,345 |  |  | $ 2,329,475 |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  | 1,999,351 |  |  | 1,783,265 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 1,976,623 |  |  | 1,768,955 |  |  |  |  |  |  |  |  |  |  |  |
SMBC LC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SBA Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available | [1] | 350,000 |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding | [1] | 295,000 |  |  | 279,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value | [1] | 287,049 |  |  | 271,371 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 350,000 |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |
SBA Debentures | HC IV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 175,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 175,000 |  |  | 175,000 |  |  |  |  |  |  |  |  | $ 175,000 |  |  |
SBA Debentures | Hercules SBIC V, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 175,000 |  |  | 175,000 |  | $ 175,000 |  |  |  |  |  |  |  |  |  |
February 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 0 |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  | $ 50,000 |
Principal Outstanding |  | 0 |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 0 |  |  | 49,981 |  |  |  |  |  |  |  |  |  |  |  |
June 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 70,000 |  |  | 70,000 |  |  |  |  |  |  |  |  |  | $ 70,000 |  |
Principal Outstanding |  | 70,000 |  |  | 70,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 69,960 |  |  | 69,919 |  |  |  |  |  |  |  |  |  |  |  |
June 2025 3-Year Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000 |  |  | 50,000 |  |  | $ 50,000 |  |  |  |  |  |  |  |  |
Principal Outstanding |  | 50,000 |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,965 |  |  | 49,926 |  |  |  |  |  |  |  |  |  |  |  |
March 2026 A Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000 |  |  | 50,000 |  |  |  |  |  |  |  | $ 50,000 |  |  |  |
Principal Outstanding |  | 50,000 |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,913 |  |  | 49,889 |  |  |  |  |  |  |  |  |  |  |  |
March 2026 B Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000 |  |  | 50,000 |  |  |  |  |  |  | $ 50,000 |  |  |  |  |
Principal Outstanding |  | 50,000 |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,905 |  |  | 49,880 |  |  |  |  |  |  |  |  |  |  |  |
September 2026 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 325,000 |  |  | 325,000 |  |  |  |  |  | $ 325,000 |  |  |  |  |  |
Principal Outstanding |  | 325,000 |  |  | 325,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 323,566 |  |  | 323,321 |  |  |  |  |  |  |  |  |  |  |  |
January 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 350,000 |  |  | 350,000 |  |  |  |  | $ 350,000 |  |  |  |  |  |  |
Principal Outstanding |  | 350,000 |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 347,598 |  |  | 347,265 |  |  |  |  |  |  |  |  |  |  |  |
2028 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 287,500 | $ 287,500 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  | 287,500 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 278,503 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
2031 Asset-Backed Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 116,845 |  |  | 119,475 |  |  |  | $ 150,000 |  |  |  |  |  |  |  |
Principal Outstanding |  | 116,845 |  |  | 119,475 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 116,272 |  |  | 118,769 |  |  |  |  |  |  |  |  |  |  |  |
2033 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 40,000 |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  | $ 40,000
Principal Outstanding |  | 40,000 |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 39,070 |  |  | 39,043 |  |  |  |  |  |  |  |  |  |  |  |
MUFG Bank Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 400,000 |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  | 105,000 |  |  | 116,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 105,000 |  |  | 116,000 |  |  |  |  |  |  |  |  |  |  |  |
SMBC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available | [2],[3] | 475,000 |  |  | 475,000 |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding | [2],[3] | 260,006 |  |  | 283,790 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value | [2],[3] | 259,822 |  |  | 283,591 |  |  |  |  |  |  |  |  |  |  |  |
SMBC Facility | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 25,000 |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  | 25,000 |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 24,800 |  |  | 24,800 |  |  |  |  |  |  |  |  |  |  |  |
SMBC Facility | SMBC LC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 175,000 |  | $ 175,000 | $ 175,000 |  |  |  |  |  |  |  |  |  |  |  |
SMBC Facility | SMBC LC Facility | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
[1] | As of March 31, 2025 and December 31, 2024, the total available debt under the SBA Debentures was $350.0 million, of which $175.0 million was available to HC IV and $175.0 million was available to SBIC V. (5)In November 2024, the Company amended its SMBC Facility and converted a portion of the existing revolver facility into a term loan facility in connection therewith. As of March 31, 2025, the term loan portion of the SMBC Facility for total available, outstanding principal, and carrying value was $25.0 million, $25.0 million, and $24.8 million respectively. As of December 31, 2024, the term loan portion of the SMBC Facility for total available, outstanding principal, and carrying value was $25.0 million, $25.0 million, and $24.8 million respectively.
[2] | In November 2024, the Company amended its SMBC Facility and converted a portion of the existing revolver facility into a term loan facility in connection therewith. As of March 31, 2025, the term loan portion of the SMBC Facility for total available, outstanding principal, and carrying value was $25.0 million, $25.0 million, and $24.8 million respectively. As of December 31, 2024, the term loan portion of the SMBC Facility for total available, outstanding principal, and carrying value was $25.0 million, $25.0 million, and $24.8 million respectively.
[3] | “Total Available” includes $175.0 million of available commitment through the letter of credit facility as of March 31, 2025 and December 31, 2024.

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