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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT (RESULTS OF OPERATIONS ) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements |  |  |
Gross profit | $ 33,146 | $ 28,356 | $ 27,868
Operating expenses: |  |  |
Selling, general and administrative | 16,777 | 18,146 | 21,515
Research and development | 9,853 | 8,502 | 11,342
Total operating expenses | 26,630 | 26,648 | 32,857
Operating loss | 6,516 | 1,708 | (4,989)
Interest income | 1,177 | 871 | 557
Interest expense | (48) | (55) | (76)
Other income, net | 2,976 | 2,748 | 3,489
Equity in net income (loss) of affiliated companies | (687) | 984 | (13,954)
Income tax benefit (expense) | 1,263 | 788 | (4,162)
Net income (loss) attributable to UTStarcom Holdings Corp. | 6,981 | 290 | (27,158)
UTSTARCOM HOLDINGS CORP |  |  |
Operating expenses: |  |  |
Selling, general and administrative | 852 | 671 | 928
Total operating expenses | 852 | 671 | 928
Operating loss | (852) | (671) | (928)
Loss before income taxes and equity in loss of affiliated companies | (852) | (671) | (928)
Equity in net income (loss) of affiliated companies | 7,833 | 803 | (26,230)
Net income (loss) attributable to UTStarcom Holdings Corp. | $ 6,981 | $ 132 | $ (27,158)

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