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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, Aceland Investments Limited (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2010 | Jun. 30, 2011 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |
Debt instrument, maturity date |  | Dec. 31, 2015 |  |  |  |  |
Equity pick up of gain (loss) of an associate |  |  | $ (400) | $ (613) | $ (687) | $ 984 |
ACELAND |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |
Cash paid to acquire investment | $ 2,100 |  |  |  |  |  |
Contribution of equity investment through a shareholder loan |  | $ 7,100 |  |  |  |  |
Equity method investment, ownership interest (as a percent) |  |  |  |  | 35.00% |  |
Investment impairment |  |  |  |  |  |  | $ 1,000
Proceeds from sale, maturity and collection of investments |  |  |  |  |  | 6,700 |
Equity pick up of gain (loss) of an associate |  |  |  | 300 | $ (200) | $ 1,000 |
Carrying amount of the investment |  |  | $ 2,100 | $ 2,100 |  |  |

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