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GOODWILL AND LONG-LIVED ASSETS - Impairment for Long-lived Assets and Restructuring and Related Charges by Asset Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Finance Lease, Impairment Loss | $ 0 | $ 70 | $ 0 | $ 1,388
Total Property, equipment and software, net | 870 | 261 | 870 | 15,896
Right-of-use assets - operating leases, net | 6,781 | 3,035 | 6,781 | 22,680
Intangible assets, net | 0 | 0 | 0 | 103
Other non-current assets | 0 | 0 | 0 | 871
Total long-lived assets | 7,651 | 3,296 | 7,651 | 39,550
Restructuring and related charges: |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Total long-lived assets | 7,651 | 3,296 | 7,651 | 17,199
Leasehold Improvements |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Property, equipment and software, impairment | 870 | 191 | 870 | 7,749
Computer hardware |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Property, equipment and software, impairment | 0 | 0 | 0 | 2,842
Internally-developed software |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Property, equipment and software, impairment | 0 | 0 | 0 | 2,988
Other Property, equipment and software, net |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Property, equipment and software, impairment | $ 0 | $ 0 | $ 0 | $ 929

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- Definition Amount of impairment loss from right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918425-209957 + Details
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