Revenue - Schedule of Components of Interest Income and Fair Value Adjustments, Net (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Interest income	[1]	$ 204,230	$ 186,360	$ 168,996
Interest expense	[1]	(31,664)	(40,433)	(34,894)
Unrealized loss on loans, loan charge-offs, and other fair value adjustments, net		(83,088)	(111,175)	(130,440)
Realized loss on sale of loans, net		(12,237)	(15,983)	(24,042)
Fair value adjustments and realized gains (losses) on beneficial interests, net		16,605	(17,707)	(26,489)
Total fair value and other adjustments, net	[1]	(78,720)	(144,865)	(180,971)
Total interest income, interest expense, and fair value adjustments, net		93,846	1,062	(46,869)
Variable Interest Entity, Primary Beneficiary
Disaggregation of Revenue [Line Items]
Interest income		16,593	28,968	19,697
Interest expense		(6,313)	(9,598)	(6,733)
Unrealized loss on loans, loan charge-offs, and other fair value adjustments, net		(11,114)	(29,396)	(5,496)
Total interest income, interest expense, and fair value adjustments, net		$ (834)	$ (10,026)	$ 7,468

[1] Balances for the years ended December 31, 2023, 2024 and 2025 include amounts related to the consolidated securitization. Refer to “Note 2. Revenue” for details.