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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, Aceland Investments Limited - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2010 | Jun. 30, 2011 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2019
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2015 |  |  |  |  |
Aceland |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Payments to acquire investments |  | $ 2.1 |  |  |  |  |  |
Contribution of equity investment through a shareholder loan |  |  | $ 7.1 |  |  |  |  |
Equity method investment, ownership interest (as a percent) |  |  |  |  |  |  |  | 35.00%
Investment impairment |  |  |  |  |  |  | $ 1.0 |
Proceeds from sale, maturity and collection of investments |  |  |  |  |  | $ 6.7 |  |
Equity pick up of gain (loss) of an associate |  |  |  | $ (0.3) | $ (0.2) | $ 1.0 |  |
Carrying amount of the investment |  |  |  | $ 2.1 |  |  |  |
Short-term investments |  |  |  |  |  |  |  | $ 2.1
Aceland | Other Security Investments [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Gain on other income | $ 0.3 |  |  |  |  |  |  |

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