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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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