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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, Disposal of IPTV Business (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 07, 2015 | Aug. 31, 2012 | Aug. 31, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012
Investment Holdings [Line Items] |  |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  |  | $ 5,336 | $ 16,347 | $ 3,947 |
UTStarcom Hong Kong Holdings Ltd | Convertible bonds of privately-held company |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Principal amount of consideration received |  |  |  | $ 3,500 | 3,500 | $ 20,200 |
Impairment Charge |  |  |  |  | 6,500 |  |
Interest rate of debt securities (as a percent) |  | 6.50% | 6.50% |  |  |  |
Principal amount of debt securities to be converted if P&L run-rate break-even is achieved on or prior to the Maturity Date |  | $ 5,000 | $ 5,000 |  |  |  |
Percentage of outstanding shares to be issued on conversion if operating income break-even is achieved on or prior to the Maturity Date |  | 8.00% |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 20,000 |  |  |  |  |  |
Proceeds from Sale of Available-for-sale Securities, Debt | $ 10,000 |  |  |  |  |  |
Cost Method Investment Ownership Percentage Upon Conversion Of Securities | 14.00% |  |  |  |  |  |
Impairment on investment |  |  |  |  | $ 6,500 |  |
UTStarcom Hong Kong Holdings Ltd | Convertible bonds of privately-held company | Maximum |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Investment In Debt Securities Percentage Of Shares To Be Issued On Conversion At Maturity Date |  | 33.00% |  |  |  |  |
UTStarcom Hong Kong Holdings Ltd | Convertible bonds of privately-held company | Minimum |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Investment In Debt Securities Percentage Of Shares To Be Issued On Conversion At Maturity Date |  | 25.00% |  |  |  |  |
Disposed of by sale, not discontinued operations | IPTV divestiture |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Amount of consideration paid by the Company upon divestiture |  | $ 30,000 |  |  |  |  |
Loss recorded on divestiture |  |  |  |  |  |  | $ 17,500
Disposed of by sale, not discontinued operations | IPTV divestiture | UTStarcom Hong Kong Holdings Ltd | Convertible bonds of privately-held company |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Principal amount of consideration received |  | $ 20,000 | $ 20,000 |  |  |  |

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