Fair Value Measurements - Sensitivity Analysis of Loans Held for Investment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment at fair value	$ 262,190	$ 925,938
Loans Held for Investment | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment at fair value	262,190	925,938
Discount rates, impact of 100 basis point increase	(1,957)	(7,471)
Discount rates, impact of 200 basis point increase	(3,888)	(14,830)
Expected credit loss rates on underlying loans, 10% adverse change	(1,753)	(5,574)
Expected credit loss rates on underlying loans, 20% adverse change	(3,595)	(11,307)
Expected prepayment rates, 10% adverse change	(857)	(4,311)
Expected prepayment rates, 20% adverse change	$ (1,675)	$ (7,480)
Loans Held for Investment | Fair Value, Measurements, Recurring | Expected weighted-average life
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected remaining weighted-average life (in years)	10 months 24 days	10 months 24 days