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LONG-TERM INVESTMENTS - Equity method investments (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Nov. 30, 2018 USD ($) director	Sep. 30, 2016 USD ($) director	Apr. 30, 2016 USD ($) director	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Equity method investments
Loss from equity method investments | $				$ 291	$ 239	$ 189
Hainan RYB
Equity method investments
Equity method investments, cash consideration invested | $			$ 231
Equity method investments, ownership percentage			51.00%
Number of seats held on the board of directors			3
Total board of director seats			5
Seven Children
Equity method investments
Equity method investments, cash consideration invested | $		$ 301
Equity method investments, ownership percentage		16.00%
Number of seats held on the board of directors		1
Total board of director seats		3
Beijing Da Ai
Equity method investments
Equity method investments, cash consideration invested | $	$ 4,400
Equity method investments, ownership percentage	19.00%
Number of seats held on the board of directors	1
Total board of director seats	3
Unsettled portion of the consideration | $				$ 3,809

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The number of seats held on the board of directors under equity method investment.

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The total number of board of director seats of the entity.

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Amount of payment to acquire investments not yet paid.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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