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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income, Convertible Bonds Held of UTStarcom Hong Kong Holdings Ltd. (Details) - UTStarcom Hong Kong Holdings Ltd - Convertible bonds of privately-held company - USD ($) $ in Millions | Apr. 07, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accumulated Other Comprehensive Income |  |  |  |
Amount invested |  | $ 3.5 | $ 3.5 | $ 20.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  | $ 0.2
Proceeds from Sale of Available-for-sale Securities, Debt | $ 10.0 |  |  |
Debt Conversion, Original Debt, Amount | $ 20.0 |  |  |
Ownership interest upon conversion of preference shares and convertible bonds | 14.00% |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | $ 0.2 |  |  |

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