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PROPERTY, EQUIPMENT AND SOFTWARE, NET - Long-Lived Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | $ 22,351 | $ 0 | $ 0
Furniture and fixtures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 413 |  |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 8,419 |  |
Office equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 198 |  |
Purchased software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 14 |  |
Computer hardware |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 2,842 |  |
Capitalized software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 304 |  |
Internally-developed software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 2,988 |  |
Total |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | $ 15,178 |  |

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