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NET INCOME (LOSS) PER SHARE (Schedule of Computation of Basic and Diluted Net Income Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:      
Net income (loss) attributable to UTStarcom Holdings Corp. $ 6,981 $ 290 $ (27,158)
Denominator:      
Weighted average shares outstanding - Basic 35,467,000 35,806,000 37,003,000
Potentially dilutive common stock equivalents-stock options and restricted stock (in shares) 709,000 596,000  
Weighted average shares outstanding-Diluted 36,176,000 36,402,000 37,003,000
Net Income (loss) per share attributable to UTStarcom Holdings Corp. - Basic $ 0.20 $ 0.01 $ (0.74)
Net income (loss) per share attributable to UTStarcom Holdings Corp.-Diluted $ 0.19 $ 0.01 $ (0.74)
Potential dilutive ordinary shares 1,200,000 1,400,000 0