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ORGANIZATION AND BASIS OF PRESENTATION - VIE arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Exclusive Consultation and Service Agreement
VIE arrangements
Fees for consultation and service	$ 1,461	$ 6,075	$ 2,139
Equity Disposal Agreement
VIE arrangements
Term of agreement (in years)	10 years
Beijing RYB Technology Development Co., Ltd ("RYB Technology") | Exclusive Consultation and Service Agreement
VIE arrangements
Term of agreement (in years)	10 years
Beijing RYB Technology Development Co., Ltd ("RYB Technology") | Business Operation Agreement
VIE arrangements
Term of agreement (in years)	10 years

X

- Definition

The term of collaborative arrangement, 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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X

- Definition

Amount of fees charged for consultation and services under a collaborative arrangement.

+ 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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