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GOODWILL AND LONG-LIVED ASSETS - Long-Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets | $ 0 | $ 0 | $ 22,351 | $ 0
Warehouse equipment |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 0 |
Furniture and fixtures |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 413 |
Leasehold improvements |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 7,558 |
Office equipment |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 198 |
Purchased software |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 14 |
Computer hardware |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 2,842 |
Right-of-use assets - Finance leases, net |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 1,318 |
Capitalized software |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 304 |
Internally-developed software |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 2,988 |
Total Property, equipment and software, net |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 15,635 |
Right-of-use assets - operating leases, net |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 19,645 |
Intangible assets, net |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 103 |
Other non-current assets |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 871 |
Long-lived assets |  |  |  |
Schedule of Impaired Long-Lived Assets [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | $ 36,254 |

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- Definition Schedule of Impaired Long-Lived Assets + References No definition available. + Details
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