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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets with Definite Lives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Intangible assets with definite lives
Gross Carrying Amount	$ 200,456	$ 221,334
Accumulated Amortization	(162,627)	(141,208)
Total	$ 37,829	$ 80,126
Weighted-Average Useful Life (Years)	4 years 1 month 6 days	3 years 9 months 18 days
Service professional relationships
Intangible assets with definite lives
Gross Carrying Amount	$ 97,160	$ 99,651
Accumulated Amortization	(97,000)	(76,445)
Total	$ 160	$ 23,206
Weighted-Average Useful Life (Years)	3 years	2 years 10 months 24 days
Technology
Intangible assets with definite lives
Gross Carrying Amount	$ 83,468	$ 89,095
Accumulated Amortization	(47,144)	(37,721)
Total	$ 36,324	$ 51,374
Weighted-Average Useful Life (Years)	5 years 6 months	5 years 3 months 18 days
Memberships
Intangible assets with definite lives
Gross Carrying Amount	$ 15,900	$ 15,900
Accumulated Amortization	$ (15,900)	(11,940)
Total		$ 3,960
Weighted-Average Useful Life (Years)	3 years	3 years
Customer lists and user base
Intangible assets with definite lives
Gross Carrying Amount	$ 800	$ 14,298
Accumulated Amortization	(192)	(13,590)
Total	$ 608	$ 708
Weighted-Average Useful Life (Years)	8 years	1 year 4 months 24 days
Trade names
Intangible assets with definite lives
Gross Carrying Amount	$ 3,128	$ 2,390
Accumulated Amortization	(2,391)	(1,512)
Total	$ 737	$ 878
Weighted-Average Useful Life (Years)	5 years 7 months 6 days	6 years 9 months 18 days

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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- Definition

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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