Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net income (loss)	$ (53,402)	$ 76,499
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Change in fair value of financial instruments	71,056	(5,839)
Stock-based compensation	92,035	50,125
Gain on loan servicing arrangement, net	(23,770)	(4,223)
Depreciation and amortization	9,859	4,984
Non-cash interest expense	2,294	990
Net changes in operating assets and liabilities:
Purchase of loans for immediate resale	(5,519,116)	(5,872,988)
Proceeds from immediate resale of loans	5,519,116	5,872,988
Purchase of loans held-for-sale	(1,459,528)	(80,305)
Principal payments received for loans held-for-sale	104,049	4,398
Proceeds from sale of loans held-for-sale	854,991	90,537
Other assets	8,719	(22,806)
Operating lease liability and right-of-use asset	7,695	1,028
Accounts payable	3,446	(4,556)
Payable to investors	(13,754)	38,811
Accrued expenses and other liabilities	(25,494)	29,854
Net cash provided by (used in) operating activities	(421,804)	179,497
Cash flows from investing activities
Proceeds from sale of loans held-for-investment	11,993	10,793
Principal payments received for loans held-for-investment	27,711	14,722
Principal payments received for notes receivable and repayments of residual certificates	5,508	9,115
Purchase of loans held-for-investment	(55,294)	(92,738)
Purchase of non-marketable equity security	(1,000)	(40,000)
Purchase of property and equipment	(7,088)	(4,956)
Capitalized software costs	(10,842)	(4,476)
Acquisition, net of cash acquired	0	(16,561)
Net cash used in investing activities	(29,012)	(124,101)
Cash flows from financing activities
Repurchases of common stock	(150,070)	0
Proceeds from secondary offering, net of underwriting discounts, commissions, and offering costs	0	263,931
Proceeds from borrowings	430,270	667,081
Payment of debt issuance costs	0	(15,727)
Purchase of capped calls	0	(58,523)
Taxes paid related to net share settlement of equity awards	(8)	(236)
Repayments of borrowings	(209,079)	(65,412)
Proceeds from issuance of common stock under employee stock purchase plan	7,662	4,145
Proceeds from exercise of stock options	10,726	9,773
Net cash provided by financing activities	89,501	805,032
Change in cash and restricted cash	(361,315)	860,428
Cash and restricted cash at beginning of period	1,191,241	311,333
Cash and restricted cash at end of period	829,926	1,171,761
Supplemental disclosures of cash flow information
Cash paid for interest	7,952	2,796
Cash paid for income taxes	206	2,247
Cash paid for amounts included in the measurement of lease liabilities	7,967	3,279
Supplemental disclosures of non-cash investing and financing activities
Issuance of common stock in connection with acquisition	0	80,256
Capitalized stock-based compensation expense	4,547	2,120
Cash and Restricted Cash
Cash	683,970
Restricted cash	145,956
Total cash and restricted cash	$ 829,926	$ 1,171,761