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Borrowings - Schedule of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Jun. 23, 2021
2018-2 Secured Notes
Debt Instrument [Line Items]
Debt instruments, net of original issue discount	$ 0	$ 712
4.875% Notes Due 2026
Debt Instrument [Line Items]
Debt instruments, net of original issue discount	700	1,200	$ 2,400
Debt instruments, net of deferred financing costs and original issue discount	1,017	1,786
Deferred financing costs, net	300	600
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility
Debt Instrument [Line Items]
Deferred financing costs, net	$ 1,322	$ 775

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