Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net loss	$ (164,801)	$ (130,026)	$ (321,143)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	42,768	62,851	64,907
Stock-based compensation	71,159	70,935	68,257
Amortization of debt discount and issuance costs	3,116	3,620	6,137
Non-cash lease expense	11,815	16,269	16,234
Impairment costs	0	1,948	1,136
Net (gain) loss on IRLCs, forward sales commitments, and loans held for sale	(19)	(1,992)	14,427
Change in fair value of mortgage servicing rights, net	(892)	3,198	(801)
Gain on extinguishment of convertible senior notes	(12,000)	(94,019)	(57,193)
Other	644	(2,113)	3,791
Change in assets and liabilities:
Accounts receivable, net	2,864	3,286	24,411
Inventory	0	114,232	243,948
Prepaid expenses and other assets	(8,229)	6,004	(5,904)
Accounts payable	6,371	(1,323)	(2,472)
Accrued and other liabilities, deferred tax liabilities, and payroll tax liabilities, noncurrent	(5,401)	(19,085)	(46,454)
Lease liabilities	(15,682)	(18,998)	(18,452)
Origination of mortgage servicing rights	(255)	(565)	(3,140)
Proceeds from sale of mortgage servicing rights	30,582	1,457	1,662
Origination of loans held for sale	(3,979,765)	(3,525,987)	(3,949,442)
Proceeds from sale of loans originated as held for sale	3,985,418	3,567,066	4,000,582
Net cash (used in) provided by operating activities	(32,307)	56,758	40,491
Investing activities
Purchases of property and equipment	(11,209)	(12,056)	(21,531)
Purchases of investments	0	(76,866)	(182,466)
Sales of investments	39,225	124,681	17,545
Maturities of investments	6,395	61,723	99,455
Cash paid for acquisition, net of cash, cash equivalents, and restricted cash acquired	0	0	(97,341)
Net cash provided by (used in) investing activities	34,411	97,482	(184,338)
Financing activities
Redemption of convertible preferred stock, net of issuance costs	(40,000)	0	0
Payment of dividends on convertible preferred stock	(367)	0	0
Proceeds from the issuance of common stock pursuant to employee equity plans	6,558	9,613	11,528
Tax payments related to net share settlements on restricted stock units	(2,284)	(16,348)	(7,498)
Borrowings from warehouse credit facilities	4,016,909	3,532,119	3,938,265
Repayments to warehouse credit facilities	(4,022,245)	(3,570,664)	(3,989,407)
Borrowings from secured revolving credit facility	0	0	565,334
Repayments to secured revolving credit facility	0	0	(765,114)
Cash paid for secured revolving credit facility issuance costs	0	0	733
Principal payments under finance lease obligations	(56)	(89)	(855)
Repurchases of convertible senior notes	(106,953)	(241,808)	(83,614)
Repayments of convertible senior notes	0	(23,512)	0
Repayment of term loan principal	2,188	313	0
Extinguishment of convertible senior notes associated with closing of term loan	0	(57,075)	0
Payments of debt issuance costs	(2,482)	(2,338)	0
Proceeds from term loan	125,000	125,000	0
Net cash used in financing activities	(28,108)	(245,415)	(332,094)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(24)	(71)	(94)
Net change in cash, cash equivalents, and restricted cash	(26,028)	(91,246)	(476,035)
Beginning of period	151,000	242,246	718,281
End of period	124,972	151,000	242,246
Supplemental disclosure of cash flow information
Cash paid for interest	36,121	15,589	20,107
Non-cash transactions
Stock-based compensation capitalized in property and equipment	4,302	4,003	3,660
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	124,972	151,000	242,246
Continuing operations
Cash and cash equivalents	124,743	149,759	232,200
Restricted cash	229	1,241	2,406
Total	124,972	151,000	234,606
Discontinued operations
Total cash, cash equivalents, and restricted cash	124,972	151,000	242,246
Properties Segment | Discontinued Operations, Disposed of by Means Other than Sale
Supplemental disclosure of cash flow information
Cash paid for interest	0	0	7,863
Non-cash transactions
Property and equipment additions in accounts payable and accrued liabilities	0	0	1,213
Discontinued operations
Cash and cash equivalents	0	0	7,640
Restricted cash	0	0	0
Total	$ 0	$ 0	$ 7,640