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PROPERTY, EQUIPMENT AND SOFTWARE, NET - Schedule of Property, Equipment and Software, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Total property, equipment and software, gross | $ 416,334 | $ 436,384
Less: accumulated depreciation and amortization | (331,050) | (311,434)
Property, equipment and software, net | 85,284 | 124,950
Net carrying amount of internally-developed software | 57,900 | 71,100
Warehouse equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, equipment and software, gross | 0 | 5,144
Furniture and fixtures |  |
Property, Plant and Equipment [Line Items] |  |
Property, equipment and software, gross | 5,005 | 9,113
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, equipment and software, gross | 24,808 | 47,927
Office equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, equipment and software, gross | 676 | 1,735
Purchased software |  |
Property, Plant and Equipment [Line Items] |  |
Property, equipment and software, gross | 435 | 7,207
Computer hardware |  |
Property, Plant and Equipment [Line Items] |  |
Property, equipment and software, gross | 121,307 | 143,118
Internally-developed software |  |
Property, Plant and Equipment [Line Items] |  |
Property, equipment and software, gross | $ 264,103 | $ 222,140

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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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