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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, UTStarcom Hong Kong Holdings Ltd - Additional Information (Details) - UTStarcom Hong Kong Holdings Ltd. - Convertible bonds of private company - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 07, 2015 | Aug. 31, 2012 | Dec. 31, 2018 | Dec. 31, 2015 | Dec. 31, 2019
Payments to Acquire Investments |  | $ 20.0 |  |  |
Interest rate of debt securities (as a percent) |  | 6.50% |  |  |
Face amount of convertible debt | $ 20.0 |  |  |  |
Proceeds from sale of bond | $ 10.0 |  |  |  |
Ownership interest upon conversion of preference shares and convertible bonds | 14.00% |  |  |  |
Impairment charge on investment |  |  | $ 0.4 | $ 6.5 |
Carrying amount of the investment |  |  |  |  | $ 3.1

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