Segment Reporting and Revenue - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue(1)	$ 275,556	$ 349,049	$ 489,639	$ 571,865
Cost of revenue	175,366	237,813	331,311	408,980
Gross profit	100,190	111,236	158,328	162,885
Technology and development	47,141	46,822	94,804	92,343
Marketing	33,033	55,922	73,436	98,111
General and administrative	61,765	68,523	131,204	124,664
Restructuring and reorganization	6,106	12,406	7,159	18,115
Total operating expenses	148,045	183,673	306,603	333,233
Loss from continuing operations	(47,855)	(72,437)	(148,275)	(170,348)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	20,643	(2,086)	63,753	(6,123)
Net loss from continuing operations	(27,212)	(74,523)	(84,522)	(176,471)
Net loss	(27,358)	(78,146)	(88,156)	(168,952)
Operating Segments | Real estate services
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue(1)	180,641	251,809	307,937	429,295
Cost of revenue	124,447	177,698	235,941	331,482
Gross profit	56,194	74,111	71,996	97,813
Technology and development	28,044	27,696	56,939	54,435
Marketing	16,004	40,765	41,064	71,608
General and administrative	20,961	24,341	40,579	47,333
Restructuring and reorganization	0	0	0	0
Total operating expenses	65,009	92,802	138,582	173,376
Loss from continuing operations	(8,815)	(18,691)	(66,586)	(75,563)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	0	(123)	0	(123)
Net loss from continuing operations	(8,815)		(66,586)	(75,686)
Net loss		(18,814)
Operating Segments | Rentals
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue(1)	45,356	38,248	88,226	76,292
Cost of revenue	10,427	7,901	20,192	15,094
Gross profit	34,929	30,347	68,034	61,198
Technology and development	16,304	14,871	32,268	29,154
Marketing	15,938	13,086	30,264	24,128
General and administrative	25,305	21,824	51,607	46,015
Restructuring and reorganization	0	0	0	0
Total operating expenses	57,547	49,781	114,139	99,297
Loss from continuing operations	(22,618)	(19,434)	(46,105)	(38,099)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	28	232	73	701
Net loss from continuing operations	(22,590)		(46,032)	(37,398)
Net loss		(19,202)
Operating Segments | Mortgage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue(1)	38,426	53,098	74,915	56,015
Cost of revenue	34,266	46,316	63,479	51,834
Gross profit	4,160	6,782	11,436	4,181
Technology and development	734	1,904	1,377	4,251
Marketing	1,054	1,843	2,034	1,871
General and administrative	6,724	9,450	13,653	10,974
Restructuring and reorganization	0	0	0	0
Total operating expenses	8,512	13,197	17,064	17,096
Loss from continuing operations	(4,352)	(6,415)	(5,628)	(12,915)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	(91)	(35)	(151)	(35)
Net loss from continuing operations	(4,443)		(5,779)	(12,950)
Net loss		(6,450)
Operating Segments | Discontinued Properties Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue(1)	95	4,740	1,244	9,963
Other revenue
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue(1)	11,133	5,894	18,561	10,263
Cost of revenue	6,226	5,898	11,699	10,570
Gross profit	4,907	(4)	6,862	(307)
Technology and development	1,118	1,189	2,342	2,225
Marketing	16	71	26	125
General and administrative	1,044	850	2,097	1,562
Restructuring and reorganization	0	0	0	0
Total operating expenses	2,178	2,110	4,465	3,912
Loss from continuing operations	2,729	(2,114)	2,397	(4,219)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	153	11	268	12
Net loss from continuing operations	2,882		2,665	(4,207)
Net loss		(2,103)
Intercompany eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue(1)	0	0	0	0
Cost of revenue	0	0	0	0
Gross profit	0	0	0	0
Technology and development	941	1,162	1,878	2,278
Marketing	21	157	48	379
General and administrative	7,731	12,058	23,268	18,780
Restructuring and reorganization	6,106	12,406	7,159	18,115
Total operating expenses	14,799	25,783	32,353	39,552
Loss from continuing operations	(14,799)	(25,783)	(32,353)	(39,552)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	20,553	(2,171)	63,563	(6,678)
Net loss from continuing operations	$ 5,754		$ 31,210	$ (46,230)
Net loss		$ (27,954)