Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net loss	$ (130,026)	$ (321,143)	$ (109,613)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	62,851	64,907	46,906
Stock-based compensation	70,935	68,257	54,722
Amortization of debt discount and issuance costs	3,620	6,137	4,989
Non-cash lease expense	16,269	16,234	11,630
Impairment costs	1,948	1,136	0
Net (gain) loss on IRLCs, forward sales commitments, and loans held for sale	(1,992)	14,427	815
Change in fair value of mortgage servicing rights, net	3,198	(801)	0
Gain on extinguishment of convertible senior notes	(94,019)	(57,193)	0
Other	(2,113)	3,791	(4,227)
Change in assets and liabilities:
Accounts receivable, net	3,286	24,411	(7,149)
Inventory	114,232	243,948	(309,063)
Prepaid expenses and other assets	6,004	(5,904)	(12,248)
Accounts payable	(1,323)	(2,472)	3,059
Accrued and other liabilities, deferred tax liabilities, and payroll tax liabilities, noncurrent	(19,085)	(46,454)	25,791
Lease liabilities	(18,998)	(18,452)	(13,268)
Origination of mortgage servicing rights	(565)	(3,140)	0
Proceeds from sale of mortgage servicing rights	1,457	1,662	0
Origination of loans held for sale	(3,525,987)	(3,949,442)	(986,982)
Proceeds from sale of loans originated as held for sale	3,567,066	4,000,582	993,070
Net cash provided by (used in) operating activities	56,758	40,491	(301,568)
Investing activities
Purchases of property and equipment	(12,056)	(21,531)	(27,492)
Purchases of investments	(76,866)	(182,466)	(146,274)
Sales of investments	124,681	17,545	98,687
Maturities of investments	61,723	99,455	106,773
Cash paid for acquisition, net of cash, cash equivalents, and restricted cash acquired	0	(97,341)	(608,000)
Net cash provided by (used in) investing activities	97,482	(184,338)	(576,306)
Financing activities
Proceeds from the issuance of common stock pursuant to employee equity plans	9,613	11,528	22,772
Tax payments related to net share settlements on restricted stock units	(16,348)	(7,498)	(27,066)
Borrowings from warehouse credit facilities	3,532,119	3,938,265	942,993
Repayments to warehouse credit facilities	(3,570,664)	(3,989,407)	(948,979)
Borrowings from secured revolving credit facility	0	565,334	624,828
Repayments to secured revolving credit facility	0	(765,114)	(448,996)
Cash paid for secured revolving credit facility issuance costs	0	733	527
Proceeds from issuance of convertible senior notes, net of issuance costs	0	0	561,529
Purchases of capped calls related to convertible senior notes	0	0	(62,647)
Conversions of convertible senior notes	0	0	(2,159)
Principal payments under finance lease obligations	(89)	(855)	(796)
Repurchases of convertible senior notes	(241,808)	(83,614)	0
Repayments of convertible senior notes	(23,512)	0	0
Repayment of term loan principal	313	0	0
Extinguishment of convertible senior notes associated with closing of term loan	(57,075)	0	0
Payments of debt issuance costs	(2,338)	0	0
Proceeds from term loan	125,000	0	0
Other financing payables	0	0	(10,611)
Net cash (used in) provided by financing activities	(245,415)	(332,094)	650,341
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(71)	(94)	(6)
Net change in cash, cash equivalents, and restricted cash	(91,246)	(476,035)	(227,539)
Beginning of period	242,246	718,281	945,820
End of period	151,000	242,246	718,281
Supplemental disclosure of cash flow information
Cash paid for interest	15,589	20,107	7,592
Non-cash transactions
Stock-based compensation capitalized in property and equipment	4,003	3,660	4,059
Property and equipment additions in accounts payable and accrued liabilities	34	99	659
Leasehold improvements paid directly by lessor	20	118	1,334
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	151,000	242,246	718,281
Continuing operations
Cash and cash equivalents	149,759	232,200	571,384
Restricted cash	1,241	2,406	5,244
Total	151,000	234,606	576,628
Discontinued operations
Total cash, cash equivalents, and restricted cash	151,000	242,246	718,281
Properties Segment | Discontinued Operations, Disposed of by Means Other than Sale
Supplemental disclosure of cash flow information
Cash paid for interest	0	7,863	3,946
Non-cash transactions
Property and equipment additions in accounts payable and accrued liabilities	0	1,213	1,782
Discontinued operations
Cash and cash equivalents	0	7,640	19,619
Restricted cash	0	0	122,034
Total	$ 0	$ 7,640	$ 141,653