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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets with Definite Lives (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 No definition available. + Details
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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 + Details
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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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