Variable Interest Entities and Securitizations - Summary of Total Assets and Total Liabilities Associated With Variable Interests in Consolidated VIEs (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Restricted cash	$ 73,234	$ 73,095
Finance receivables at fair value, current	12,501	12,939
Finance receivables held for sale, net	503,546	321,626
Total current assets	952,639	1,220,109
Finance receivables at fair value, noncurrent	336,169	140,235
Other assets	23,527	26,004
Total assets	1,475,422	1,619,027
Current Liabilities:
Current portion of long term debt	172,410	47,239
Warehouse credit facilities	421,268	229,518
Accrued expenses	52,452	76,795
Total current liabilities	856,806	703,320
Securitization debt, net of current portion	454,173	402,154
Other liabilities	17,109	18,183
Total liabilities	1,353,271	1,143,786
Securitization Vehicles
Current Assets:
Restricted cash	28,458	9,023
Finance receivables at fair value, current	10,878	5,336
Other current assets	12,390	2,730
Total current assets	51,726	17,089
Finance receivables at fair value, noncurrent	306,120	72,568
Total assets	357,846	89,657
Current Liabilities:
Current portion of long term debt	163,516	47,239
Accrued expenses	1,286	90
Total current liabilities	164,802	47,329
Securitization debt, net of current portion	150,579	32,590
Other liabilities	3,248	686
Total liabilities	318,629	80,605
Warehouse Facilities
Current Assets:
Restricted cash	20,688	15,654
Finance receivables at fair value, current	947	6,156
Finance receivables held for sale, net	457,185	305,917
Other current assets	12,814	9,004
Total current assets	491,634	336,731
Finance receivables at fair value, noncurrent	23,499	47,024
Other assets	1,759
Total assets	516,892	383,755
Current Liabilities:
Warehouse credit facilities	421,268	229,518
Accrued expenses	2,674	1,439
Total current liabilities	423,942	230,957
Other liabilities	7,127	6,724
Total liabilities	431,069	237,681
Consolidated VIEs
Current Assets:
Restricted cash	49,146	24,677
Finance receivables at fair value, current	11,825	11,492
Finance receivables held for sale, net	457,185	305,917
Other current assets	25,204	11,734
Total current assets	543,360	353,820
Finance receivables at fair value, noncurrent	329,619	119,592
Other assets	1,759	0
Total assets	874,738	473,412
Current Liabilities:
Current portion of long term debt	163,516	47,239
Warehouse credit facilities	421,268	229,518
Accrued expenses	3,960	1,529
Total current liabilities	588,744	278,286
Securitization debt, net of current portion	150,579	32,590
Other liabilities	10,375	7,410
Total liabilities	$ 749,698	$ 318,286