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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings per Share
Anti-dilutive stock options and awards/units outstanding (in shares)			605
Potential dilutive ordinary shares	1,500	1,200	1,400
Net Income attributable to UTStarcom Holdings Corp.	$ 4,820	$ 6,981	$ 290
Weighted average shares outstanding-Diluted	36,319	36,176	36,402
Net Income per shares attributable to UTStarcom Holdings Corp.—Diluted	$ 0.13	$ 0.19	$ 0.01
Stock options and awards/units
Earnings per Share
Anti-dilutive stock options and awards/units outstanding (in shares)			605

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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