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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Sales |  |  |  |
Net sales | [1] | $ 14,052 | $ 15,921 | $ 24,310
Cost of net sales |  |  |  |
Cost of net sales |  | 11,385 | 16,996 | 20,781
Gross profit (loss) by Segment |  | 2,667 | (1,075) | 3,529
Operating expenses: |  |  |  |
Research and development |  | 4,762 | 6,886 | 8,083
Total operating expenses |  | 7,054 | 4,244 | 26,772
Operating loss |  | (4,387) | (5,319) | (23,243)
Interest income |  | 2,154 | 1,136 | 990
Interest expense |  |  |  | (10)
Other income, net |  | (706) | 1,649 | (2,166)
Income tax benefit (expense) |  | (2,063) | (3,294) | 1,782
Net loss |  | (5,002) | (5,828) | (23,676)
Comprehensive loss |  | (11,497) | (9,554) | (22,116)
UTSTARCOM HOLDINGS CORP |  |  |  |
Operating expenses: |  |  |  |
Selling, general and administrative |  | 862 | 769 | 693
Total operating expenses |  | 862 | 769 | 693
Operating loss |  | (862) | (769) | (693)
Loss before income taxes and equity in loss of affiliated companies |  | (862) | (769) | (693)
Equity in net loss of affiliated companies |  | (4,140) | (5,059) | (22,983)
Net loss |  | (5,002) | (5,828) | (23,676)
Other comprehensive income (loss), net of tax |  | (6,495) | (3,726) | 1,560
Comprehensive loss |  | $ (11,497) | $ (9,554) | $ (22,116)
[1] | Revenue recognized for the years ended December 31, 2022, 2021 and 2020 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.3 million, $0.4 million and $1.2 million, respectively.

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