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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Acquired intangible assets, net (Details) |  | 12 Months Ended
--- | --- | ---
Dec. 10, 2018 | Dec. 31, 2019
Technology Platform |  |
Acquired intangible assets, net |  |
Useful lives | 5 years |
Technology Platform | Minimum |  |
Acquired intangible assets, net |  |
Useful lives |  | 3 years
Technology Platform | Maximum |  |
Acquired intangible assets, net |  |
Useful lives |  | 5 years
Members |  |
Acquired intangible assets, net |  |
Useful lives |  | 4 years
Branding |  |
Acquired intangible assets, net |  |
Useful lives | 10 years | 10 years
In-progress Orders |  |
Acquired intangible assets, net |  |
Useful lives | 1 month 6 days | 1 month 6 days

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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