GOODWILL AND INTANGIBLE ASSETS - Intangible Assets with Definite Lives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Intangible assets with definite lives
Gross Carrying Amount	$ 89,229	$ 179,299
Accumulated Amortization	(89,229)	(171,341)
Total	$ 0	$ 7,958
Weighted-Average Useful Life (Years)	5 years 3 months 18 days	4 years 1 month 6 days
Amortization of Intangibles	$ 7,958	$ 13,774	$ 16,097
Technology
Intangible assets with definite lives
Gross Carrying Amount	82,234	82,114
Accumulated Amortization	(82,234)	(74,156)
Total	$ 0	$ 7,958
Weighted-Average Useful Life (Years)	5 years 6 months	5 years 6 months
Service professional relationships
Intangible assets with definite lives
Gross Carrying Amount	$ 5,619	$ 95,858
Accumulated Amortization	(5,619)	(95,858)
Total	$ 0	$ 0
Weighted-Average Useful Life (Years)	2 years 6 months	3 years
Service professional relationships | Ads and Leads
Intangible assets with definite lives
Amortization of Intangibles	$ 90,500
Trade names
Intangible assets with definite lives
Gross Carrying Amount	1,376	$ 1,327
Accumulated Amortization	(1,376)	(1,327)
Total	$ 0	$ 0
Weighted-Average Useful Life (Years)	5 years	5 years