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Senior Securities - Summary of Senior Securities (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Coverage Per Unit | $ 5,643 | $ 6,932 | $ 5,244 | $ 6,906 | $ 11,020 | $ 9,508 | $ 5,812 | $ 5,221 | $ 6,513 | $ 4,056
Asset Coverage Per Unit, Notes | 1,778 | 1,789 | 1,643 | 1,929 | 1,948 | 2,058 | 1,992 | 2,157 | 2,335 | 2,352
Operating Facility |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | 151,943 | 120,671 | 163,169 | 123,890 | 154,480 | 120,454 | 108,498 | 82,000 | 57,000 | 100,500
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Funding Facility I |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  |  |  |  | 158,000 | 212,000 | 175,000 | 175,000
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Funding Facility II |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | 100,000 | 75,000 | 100,000 | 100,000 | 0 | 36,000 |  |  |  |
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |
Merger Sub Facility |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | 47,000 | 60,000 |  |  |  |  |  |  |  |
Asset Coverage Per Unit | 5,643 | 6,932 |  |  |  |  |  |  |  |
Involuntary Liquidating Preference Per Unit | 0 | 0 |  |  |  |  |  |  |  |
SBA Debentures |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | 111,200 | 131,500 | 150,000 | 150,000 | 150,000 | 138,000 | 138,000 | 98,000 | 83,000 | 61,000
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
2019 Convertible Notes |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  |  |  |  |  | 108,000 | 108,000 | 108,000
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
2022 Convertible Notes |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  |  | 140,000 | 140,000 | 140,000 | 140,000 | 140,000 | 140,000
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | $ 0
2022 Notes |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  |  |  | 175,000 | 175,000 | 175,000 | 175,000 |
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | 0 | 0 | $ 0 | $ 0 |
2024 Notes |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  | 250,000 | 250,000 | 250,000 | 250,000 | 200,000 |  |  |
Involuntary Liquidating Preference Per Unit | 0 | 0 | 0 | 0 | 0 | $ 0 | $ 0 |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  | 92,000 |  |  |  |  |  |  |  |
Involuntary Liquidating Preference Per Unit | 0 | 0 |  |  |  |  |  |  |  |
2026 Notes |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | 325,000 | 325,000 | 325,000 | 325,000 | 325,000 |  |  |  |  |
Involuntary Liquidating Preference Per Unit | 0 | 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |
2029 Notes |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | 325,000 | 325,000 |  |  |  |  |  |  |  |
Involuntary Liquidating Preference Per Unit | $ 0 | $ 0 |  |  |  |  |  |  |  |

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