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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Sales |  |  |  |
Net sales | [1] | $ 15,753 | $ 14,052 | $ 15,921
Cost of net sales |  |  |  |
Cost of net sales |  | 11,363 | 11,385 | 16,996
Gross profit (loss) by Segment |  | 4,390 | 2,667 | (1,075)
Operating expenses: |  |  |  |
Research and development |  | 5,881 | 4,762 | 6,886
Total operating expenses |  | 11,199 | 7,054 | 4,244
Operating loss |  | (6,809) | (4,387) | (5,319)
Interest income |  | 2,208 | 2,154 | 1,136
Other income, net |  | 2,024 | (706) | 1,649
Income tax expense |  | (1,274) | (2,063) | (3,294)
Net loss |  | (3,851) | (5,002) | (5,828)
Comprehensive loss |  | (6,378) | (11,497) | (9,554)
UTSTARCOM HOLDINGS CORP |  |  |  |
Operating expenses: |  |  |  |
Selling, general and administrative |  | 768 | 862 | 769
Total operating expenses |  | 768 | 862 | 769
Operating loss |  | (768) | (862) | (769)
Loss before income taxes and equity in loss of affiliated companies |  | (768) | (862) | (769)
Equity in net loss of affiliated companies |  | (3,083) | (4,140) | (5,059)
Net loss |  | (3,851) | (5,002) | (5,828)
Other comprehensive loss, net of tax |  | (2,527) | (6,495) | (3,726)
Comprehensive loss |  | $ (6,378) | $ (11,497) | $ (9,554)
[1] | Revenue recognized for the years ended December 31, 2023, 2022 and 2021 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.1 million, $0.3 million and $0.4 million, respectively.

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