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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, Aceland Investments Limited - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2010 | Jun. 30, 2011 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2019
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2015 |  |  |  |  |  |
Equity in net income (loss) of affiliated companies |  |  |  | $ (400) | $ (613) |  |  |  |
Aceland |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |
Payments to acquire investments |  | $ 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 in net income (loss) of affiliated companies |  |  |  |  | (300) | $ (200) | $ 1,000 |  |
Carrying amount of the investment |  |  |  | $ 2,100 | $ 2,100 |  |  |  |
Short-term investments |  |  |  |  |  |  |  |  | $ 2,100
Aceland | Other Investment |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |
Gain on other income | $ 300 |  |  |  |  |  |  |  |

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