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GOODWILL AND LONG-LIVED ASSETS - Long-lived Assets Impairment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | $ 10,883
Right-of-use assets - operating leases, net |  | 10,494
Intangible assets, net |  | 103
Other non-current assets |  | 871
Total long-lived assets | $ 0 | 22,351
Furniture and fixtures |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | 413
Leasehold improvements |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | 2,806
Office equipment |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | 198
Purchased software |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | 14
Computer hardware |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | 2,842
Right-of-use assets - finance leases, net |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | 1,318
Capitalized software |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | 304
Internally-developed software |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Tangible asset impairment |  | $ 2,988

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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