Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income	$ 2,821	$ 47,386
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Change in fair value of financial instruments	49,103	(4,167)
Stock-based compensation	55,379	29,808
Gain on loan servicing arrangement, net	(17,732)	(2,102)
Depreciation and amortization	6,135	2,799
Non-cash interest expense	1,537	216
Net changes in operating assets and liabilities:
Purchase of loans for immediate resale	(4,797,036)	(3,414,231)
Proceeds from immediate resale of loans	4,797,036	3,414,231
Purchase of loans held-for-sale	(1,125,765)	(38,311)
Principal payments received for loans held-for-sale	66,790	3,676
Proceeds from sale of loans held-for-sale	634,599	57,183
Other assets	13,196	(19,651)
Operating lease liability and right-of-use asset	5,265	448
Accounts payable	15,079	3,380
Payable to investors	(1,886)	31,446
Accrued expenses and other liabilities	(24,959)	23,785
Net cash provided by (used in) operating activities	(320,438)	135,896
Cash flows from investing activities
Proceeds from sale of loans held-for-investment	83	9,718
Principal payments received for loans held-for-investment	18,524	7,488
Principal payments received for notes receivable and repayments of residual certificates	3,912	6,349
Purchase of loans held-for-investment	(13,876)	(42,548)
Purchase of non-marketable equity security	(1,000)	0
Purchase of property and equipment	(5,578)	(1,997)
Capitalized software costs	(6,829)	(2,148)
Acquisition, net of cash acquired	0	(16,561)
Net cash used in investing activities	(4,764)	(39,699)
Cash flows from financing activities
Payments for repurchase of common stock	(125,042)	0
Proceeds from secondary offering, net of underwriting discounts, commissions, and offering costs	0	263,931
Proceeds from borrowings	261,199	5,831
Taxes paid related to net share settlement of equity awards	0	(236)
Repayments of borrowings	(101,613)	(62,455)
Proceeds from issuance of common stock under employee stock purchase plan	4,431	0
Proceeds from exercise of stock options	9,407	2,932
Net cash provided by financing activities	48,382	210,003
Change in cash and restricted cash	(276,820)	306,200
Cash and restricted cash at beginning of period	1,191,241	311,333
Cash and restricted cash at end of period	914,421	617,533
Supplemental disclosures of cash flow information
Cash paid for interest	4,076	2,527
Cash paid for income taxes	52	1,567
Cash paid for amounts included in the measurement of lease liabilities	4,770	2,132
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	2,997	1,020
Cash and Restricted Cash
Cash	790,431
Restricted cash	123,990
Total cash and restricted cash	$ 914,421	$ 617,533