Revenue - Schedule of Components of Interest Income and Fair Value Adjustments, Net (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Interest income	[1]	$ 52,883	$ 33,916	$ 104,054	$ 79,231
Interest expense	[1]	(11,470)	(4,282)	(22,184)	(11,414)
Unrealized loss on loans, loan charge-offs, and other fair value adjustments, net		(31,949)	(24,154)	(61,542)	(68,698)
Realized loss on sale of loans, net		(4,511)	(11,447)	(11,615)	(19,300)
Fair value adjustments and realized losses on beneficial interests, net		(7,855)	(1,956)	(21,889)	(1,956)
Total fair value and other adjustments, net	[1]	(44,315)	(37,557)	(95,046)	(89,954)
Total interest income, interest expense, and fair value adjustments, net		(2,902)	(7,923)	(13,176)	(22,137)
Variable Interest Entity, Primary Beneficiary
Disaggregation of Revenue [Line Items]
Interest income		7,714	0	16,338	0
Interest expense		(2,514)	0	(5,274)	0
Unrealized loss on loans, loan charge-offs, and other fair value adjustments, net		(9,266)	0	(19,917)	0
Total interest income, interest expense, and fair value adjustments, net		$ (4,066)	$ 0	$ (8,853)	$ 0

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