Revenue - Schedule of Components of Interest Income and Fair Value Adjustments, Net (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Interest income	[1]	$ 40,845	$ 37,692	$ 144,899	$ 116,923
Interest expense	[1]	(10,818)	(9,414)	(33,002)	(20,828)
Unrealized loss on loans, loan charge-offs, and other fair value adjustments, net		(31,579)	(30,349)	(92,800)	(99,048)
Realized loss on sale of loans, net		(2,950)	(2,955)	(14,565)	(22,255)
Fair value adjustments and realized losses on beneficial interests, net		(948)	(7,172)	(23,158)	(9,127)
Total fair value and other adjustments, net	[1]	(35,477)	(40,476)	(130,523)	(130,430)
Total interest income, interest expense, and fair value adjustments, net		(5,450)	(12,198)	(18,626)	(34,335)
Variable Interest Entity, Primary Beneficiary
Disaggregation of Revenue [Line Items]
Interest income		6,748	10,048	23,086	10,048
Interest expense		(2,272)	(3,754)	(7,546)	(3,754)
Unrealized loss on loans, loan charge-offs, and other fair value adjustments, net		(5,726)	367	(25,643)	367
Total interest income, interest expense, and fair value adjustments, net		$ (1,250)	$ 6,661	$ (10,103)	$ 6,661

[1] Balances for the three and nine months ended September 30, 2023 and 2024 include amounts related to the consolidated securitization. Refer to “Note 2. Revenue” for details.