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BASIS OF PRESENTATION, LIQUIDITY - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net income (loss) attributable to UTStarcom Holdings Corp. | $ (23,676,000) | $ (3,913,000) | $ 4,820,000
Accumulated deficit | 1,240,379,000 | 1,216,703,000 |
Net cash inflow (used) from operations | (3,400,000) | (24,147,000) | $ (26,106,000)
Cash and cash equivalents | 34,221,000 | 34,966,000 |
Subsidiaries | China |  |  |
Cash and cash equivalents | 12,200,000 | $ 3,100,000 |
Accumulated profit determined in accordance with accounting standards of a particular country that can be paid as dividends | $ 0 |  |

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