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LONG-TERM INVESTMENTS - Equity method investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
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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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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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