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OTHER NON-CURRENT ASSETS (Details) $ in Thousands, ¥ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 26, 2019 CNY (¥) | Mar. 26, 2019 USD ($) | Feb. 05, 2019 CNY (¥) | Feb. 05, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 20, 2018 USD ($) | Dec. 31, 2017 USD ($)
OTHER NON-CURRENT ASSETS |  |  |  |  |  |  |
Rental deposits |  |  |  |  | $ 4,027 |  | $ 3,110
Prepayment for investments |  |  |  |  | 20,021 |  |
Other non-current assets |  |  |  |  | 24,048 |  | $ 3,110
Business combination, cash consideration |  |  |  |  | 5,515 |  |
Loan amount, current |  |  |  |  | $ 582 |  |
Singapore education group | Subsequent events |  |  |  |  |  |  |
OTHER NON-CURRENT ASSETS |  |  |  |  |  |  |
Acquired interest (as a percent) |  |  | 77.00% | 77.00% |  |  |
Consideration transferred |  |  | ¥ 125.0 | $ 14,506 |  |  |
Borrower | Singapore education group | Subsequent events |  |  |  |  |  |  |
OTHER NON-CURRENT ASSETS |  |  |  |  |  |  |
Business combination, cash consideration | ¥ 146.2 | $ 21,400 |  |  |  |  |
Percentage of issued and outstanding shares of common stock | 77.00% | 77.00% |  |  |  |  |
Borrower | Loan agreement |  |  |  |  |  |  |
OTHER NON-CURRENT ASSETS |  |  |  |  |  |  |
Loan amount, current |  |  |  |  |  | $ 14,506 |

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