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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term investments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investments | $ 5,224 | $ 5,856
Cost Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investments | 3,129 | 3,499
Equity Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investments | 2,095 | 2,357
UTStarcom Hong Kong Holdings Ltd. | Cost Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investments | 3,129 | 3,499
ACELAND | Equity Method Investments |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |
Total investments | $ 2,095 | $ 2,357

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