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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - RESULTS OF OPERATIONS (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Sales |  |  |  |  |
Net sales | [1] |  | $ 24,310 | $ 65,623 | $ 115,944
Cost of net sales |  |  |  |  |
Cost of net sales |  |  | 20,781 | 41,466 | 83,676
Gross profit (loss) by Segment |  |  | 3,529 | 24,157 | 32,268
Operating expenses: |  |  |  |  |
Selling, general and administrative | [2] |  | 18,689 | 15,827 | 15,156
Research and development |  |  | 8,083 | 14,467 | 12,745
Total operating expenses |  |  | 26,772 | 30,294 | 27,901
Operating income (loss) |  |  | (23,243) | (6,137) | 4,367
Interest income |  |  | 990 | 1,337 | 1,749
Interest expense |  |  | (10) | (16) | (47)
Other income, net |  |  | (2,166) | 872 | (644)
Equity in net income (loss) of affiliated companies |  | $ (400) |  |  | (613)
Income tax benefit |  |  | 1,782 | 31 | 378
Net income (loss) and comprehensive income (loss) |  |  | (23,676) | (3,913) | 4,820
UTSTARCOM HOLDINGS CORP |  |  |  |  |
Operating expenses: |  |  |  |  |
Selling, general and administrative |  |  | 693 | 633 | 697
Total operating expenses |  |  | 693 | 633 | 697
Operating income (loss) |  |  | (693) | (633) | (697)
Loss before income taxes and equity in loss of affiliated companies |  |  | (693) | (633) | (697)
Equity in net income (loss) of affiliated companies |  |  | (22,983) | (3,281) | 5,517
Net income (loss) and comprehensive income (loss) |  |  | $ (23,676) | $ (3,914) | $ 4,820
[1] | Revenue recognized in the years ended December 31, 2020, 2019 and 2018 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each respective period was $1.2 million, $2.8 million and $4.0 million, respectively.
[2] | Allowances for credit losses of $9.4 million, $4.4 million and $0.8 million were recognized in the selling expenses in 2020, 2019 and 2018, respectively.

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