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BASIS OF PRESENTATION, LIQUIDITY - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income (loss) attributable to UTStarcom Holdings Corp. $ (5,828,000) $ (23,676,000) $ (3,913,000)
Accumulated deficit 1,246,207,000 1,240,379,000  
Net cash inflow (used) from operations 19,829,000 (3,400,000) $ (24,147,000)
Cash and cash equivalents 53,797,000 34,221,000  
Subsidiaries | China      
Cash and cash equivalents 12,200,000 $ 12,200,000  
Accumulated profit determined in accordance with accounting standards of a particular country that can be paid as dividends $ 0