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Borrowings - Schedule of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Jun. 23, 2021
2018-2 Secured Notes
Debt Instrument [Line Items]
Debt instruments, net of original issue discount		$ 712
4.875% Notes due 2026
Debt Instrument [Line Items]
Debt instruments, net of original issue discount	$ 800	1,200	$ 2,400
Deferred financing costs and original issue discount, net	1,208	1,786
Deferred financing costs, net	400	600
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility
Debt Instrument [Line Items]
Deferred financing costs, net	$ 1,352	$ 775

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