Revenue - Schedule of Components of Interest Income and Fair Value Adjustments, Net (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Interest income	[1]	$ 168,996	$ 105,580	$ 20,634
Interest expense	[1]	(34,894)	(10,843)	(3,274)
Unrealized gain (loss) on loans, loan charge-offs, and other fair value adjustments, net		(130,440)	(101,422)	1,894
Realized gain (loss) on sale of loans, net		(24,042)	(58,143)	28,060
Fair value losses on beneficial interests		(26,489)	0	0
Total fair value and other adjustments, net	[1]	(180,971)	(159,565)	29,954
Total interest income, interest expense, and fair value adjustments, net		(46,869)	(64,828)	47,314
Variable Interest Entity, Primary Beneficiary
Disaggregation of Revenue [Line Items]
Interest income		19,697	0	0
Interest expense		(6,733)	0	0
Unrealized gain (loss) on loans, loan charge-offs, and other fair value adjustments, net		(5,496)	0	0
Total interest income, interest expense, and fair value adjustments, net		$ 7,468	$ 0	$ 0

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