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Borrowings - Schedule of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Jun. 23, 2021
--- | --- | --- | ---
2018-2 Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instruments, net of discount | $ 855 | $ 1,226 |
4.875% Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instruments, net of discount | 1,346 | 1,704 | $ 2,430
Deferred financing costs, net | 628 | 818 |
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Deferred financing costs, net | $ 858 | $ 1,107 |

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