Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net loss		$ (125,826)	$ (197,734)
Adjustments to reconcile net loss to net cash provided by operating activities:
Change in fair value of loans		167,545	131,222
Change in fair value of servicing assets		12,838	16,888
Change in fair value of servicing liabilities		(877)	(1,655)
Change in fair value of beneficial interest assets		(35,825)	9,128
Change in fair value of beneficial interest liabilities		12,633	(848)
Change in fair value of other financial instruments		8,263	(3,418)
Stock-based compensation		103,604	142,273
Gain on loan servicing rights, net		(11,448)	(10,432)
Gain on debt extinguishment		(33,361)	0
Depreciation and amortization		15,850	15,800
Non-cash interest expense		2,156	2,296
Other		(10,874)	(2,260)
Net changes in operating assets and liabilities:
Purchases of loans held-for-sale		(2,626,246)	(2,076,734)
Proceeds from sale of loans held-for-sale		2,613,039	1,875,358
Principal payments received for loans held-for-sale		157,010	139,582
Principal payments received for loans held by consolidated securitization		36,532	12,302
Payments on beneficial interest liabilities		(3,692)	0
Other assets		(2,110)	27
Operating lease liability and right-of-use asset		(600)	1,563
Payable to investors for beneficial interest assets	[1]	0	5,749
Accrued expenses and other liabilities		18,646	(25,220)
Net cash provided by operating activities		297,257	33,887
Cash flows from investing activities
Purchases and originations of loans held-for-investment		(196,580)	(121,294)
Proceeds from sale of loans held-for-investment		0	774
Principal payments received for loans held-for-investment		99,768	78,327
Principal payments received for notes receivable and repayments of residual certificates		4,004	3,556
Purchases of property and equipment		(837)	(1,285)
Capitalized software costs		(5,734)	(9,135)
Acquisition of beneficial interest assets		(63,246)	(39,505)
Proceeds from beneficial interest assets		2,808	0
Net cash used in investing activities		(159,817)	(88,562)
Cash flows from financing activities
Proceeds from warehouse borrowings		297,587	529,494
Proceeds from convertible notes issuance, net of debt issuance costs paid to lender		423,002	0
Payment of debt issuance costs to third party		(1,455)	0
Repayments of warehouse borrowings		(293,179)	(514,792)
Payments for repurchases of convertible notes		(325,344)	0
Purchase of capped calls		(40,883)	0
Settlement of capped calls		580	0
Principal payments made on securitization notes		(42,705)	(10,016)
Payable to investors	[1]	12,990	(50,668)
Proceeds from issuance of securitization notes		0	165,318
Proceeds from issuance of common stock under employee stock purchase plan		7,685	8,431
Proceeds from exercise of stock options		12,281	9,475
Taxes paid related to net share settlement of equity awards		(19)	(6)
Net cash provided by financing activities		50,540	137,236
Change in cash and restricted cash		187,980	82,561
Supplemental disclosures of cash flow information
Cash paid for interest		34,795	22,481
Cash (received) paid for income taxes, net		250	(982)
Supplemental disclosures of non-cash investing and financing activities
Settlement of borrowings in connection with loan sale		(221,749)	0
Beneficial interests obtained in connection with loan sale		45,971	0
Capitalized stock-based compensation expense		2,809	5,890
Issuance costs of new convertible notes		(714)	0
Issuance of line of credit receivable		(30,907)	0
Securities retained under consolidated securitization transaction		0	44,763
Beneficial interest assets included in payable to investors		0	5,749
Cash and Restricted Cash
Cash		445,274
Restricted cash		210,493
Total cash and restricted cash		$ 655,767	$ 615,028

[1] During the nine months ended September 30, 2024, the Company elected to change the presentation of changes in the payable to investors balance on the condensed consolidated statement of cash flows, refer to “Note 1. Description of Business and Significant Accounting Policies” for further details.