Segment Reporting and Revenue - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 976,672	$ 1,099,574	$ 1,058,638
Cost of revenue	646,853	790,455	665,419
Gross profit	329,819	309,119	393,219
Technology and development	183,294	178,924	143,481
Marketing	117,863	155,309	136,851
General and administrative	238,790	243,390	208,722
Employee termination costs	7,927	32,353	0
Total operating expenses	547,874	609,976	489,054
(Loss) income from continuing operations	(218,055)	(300,857)	(95,835)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	91,663	51,060	4,611
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(126,392)	(249,797)	(91,224)
Operating Segments | Real estate services
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	618,577	787,076	903,334
Cost of revenue	462,625	608,027	603,320
Gross profit	155,952	179,049	300,014
Technology and development	108,201	105,196	81,588
Marketing	59,746	98,673	98,746
General and administrative	76,851	88,171	84,655
Employee termination costs	0	0
Total operating expenses	244,798	292,040	264,989
(Loss) income from continuing operations	(88,846)	(112,991)	35,025
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	59	(123)	(87)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(88,787)	(113,114)	34,938
Operating Segments | Rentals
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	184,812	155,910	121,877
Cost of revenue	42,086	33,416	21,739
Gross profit	142,726	122,494	100,138
Technology and development	63,934	59,899	41,492
Marketing	53,952	51,064	36,174
General and administrative	94,252	92,728	71,943
Employee termination costs	503	0
Total operating expenses	212,641	203,691	149,609
(Loss) income from continuing operations	(69,915)	(81,197)	(49,471)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	215	1,389	3,301
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(69,700)	(79,808)	(46,170)
Operating Segments | Mortgage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	134,108	132,904	19,818
Cost of revenue	118,178	126,552	26,096
Gross profit	15,930	6,352	(6,278)
Technology and development	2,871	6,034	10,396
Marketing	4,064	4,889	561
General and administrative	25,012	25,680	8,306
Employee termination costs	0	0
Total operating expenses	31,947	36,603	19,263
(Loss) income from continuing operations	(16,017)	(30,251)	(25,541)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	(392)	(114)	3
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(16,409)	(30,365)	(25,538)
Operating Segments | Discontinued Properties Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	1,244	17,783	16,526
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	39,175	23,684	13,609
Cost of revenue	23,964	22,460	14,264
Gross profit	15,211	1,224	(655)
Technology and development	4,504	3,591	2,528
Marketing	60	199	209
General and administrative	4,017	3,307	2,288
Employee termination costs	0	0
Total operating expenses	8,581	7,097	5,025
(Loss) income from continuing operations	6,630	(5,873)	(5,680)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	712	140	2
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	7,342	(5,733)	(5,678)
Corporate overhead
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	0	0	0
Cost of revenue	0	0	0
Gross profit	0	0	0
Technology and development	3,784	4,204	7,477
Marketing	41	484	1,161
General and administrative	38,658	33,504	41,530
Employee termination costs	7,424	32,353
Total operating expenses	49,907	70,545	50,168
(Loss) income from continuing operations	(49,907)	(70,545)	(50,168)
Interest income, interest expense, income tax expense, gain on extinguishment of convertible senior notes, and other expense, net	91,069	49,768	1,392
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 41,162	$ (20,777)	$ (48,776)