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v3.25.4

OPERATING SEGMENT INFORMATION (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 USD ($) segment | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
OPERATING SEGMENT INFORMATION |  |  |
Number of operating segments | segment | 2 |  |
Number of reportable segments | segment | 2 |  |
Revenue | $ 844,556 | $ 833,881 | $ 826,339
Gross profit | 420,706 | 439,512 | 408,083
Research and development expense | 178,872 | 179,941 | 190,660
Sales and marketing expense | 133,075 | 137,830 | 137,460
General and administrative expense | 64,239 | 68,740 | 54,962
Amortization of acquired intangible assets | 23,849 | 25,969 | 28,601
Acquisition-, disposal- and integration-related expense | 4,337 |  | 4,476
Restructuring and related | 19,658 | 10,160 | 16,209
Interest expense, net | 44,011 | 33,821 | 27,320
Other (income) expense, net | (2,226) | 29,119 | 3,768
Loss before income taxes | (45,109) | (46,068) | (55,373)
Segment depreciation expense: |  |  |
Depreciation expense | 16,728 | 13,539 | 14,105
Operating segment |  |  |
OPERATING SEGMENT INFORMATION |  |  |
Revenue | 844,556 | 833,881 | 826,339
Cost of revenue | 423,850 | 394,369 | 418,256
Total segment adjusted gross profit | 442,010 | 466,030 | 439,030
Reconciling items |  |  |
OPERATING SEGMENT INFORMATION |  |  |
Stock-based compensation expense | (960) | (1,625) | (2,657)
Amortization of acquired technology | (20,344) | (24,893) | (28,290)
Cloud and Edge |  |  |
Segment depreciation expense: |  |  |
Depreciation expense | 9,554 | 9,337 | 9,798
Cloud and Edge | Operating segment |  |  |
OPERATING SEGMENT INFORMATION |  |  |
Revenue | 511,430 | 505,157 | 477,647
Cost of revenue | 188,355 | 175,940 | 177,629
Total segment adjusted gross profit | 326,717 | 338,194 | 314,594
IP Optical Networks |  |  |
Segment depreciation expense: |  |  |
Depreciation expense | 7,174 | 4,202 | 4,307
IP Optical Networks | Operating segment |  |  |
OPERATING SEGMENT INFORMATION |  |  |
Revenue | 333,126 | 328,724 | 348,692
Cost of revenue | 235,495 | 218,429 | 240,627
Total segment adjusted gross profit | $ 115,293 | $ 127,836 | $ 124,436

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