| Schedule of segment reporting information |
The tables below present significant segment expenses regularly reviewed by the CODM for the three months ended March 31, 2026 and 2025 (in thousands): | | | | | | | Three months ended | | March 31, | | March 31, | | 2026 | | 2025 | Segment revenue: | | | | | | Cloud and Edge | $ | 99,512 | | $ | 107,591 | IP Optical Networks | | 63,094 | | | 73,688 | Revenue | $ | 162,606 | | $ | 181,279 |
| | | | | | | Three months ended | | March 31, | | March 31, | | 2026 | | 2025 | Segment adjusted gross profit: | | | | | | Cloud and Edge | $ | 56,522 | | $ | 67,296 | IP Optical Networks | | 17,935 | | | 20,814 | Total segment adjusted gross profit | | 74,457 | | | 88,110 | | | | | | | Reconciliation of segment adjusted gross profit to gross profit and loss before income taxes | | | | | | Stock-based compensation expense | | (204) | | | (352) | Amortization of acquired technology | | (4,562) | | | (5,388) | Gross profit | | 69,691 | | | 82,370 | | | | | | | Research and development expense | | 44,445 | | | 43,568 | Sales and marketing expense | | 32,269 | | | 31,788 | General and administrative expense | | 16,978 | | | 15,128 | Amortization of acquired intangible assets | | 5,656 | | | 6,155 | Restructuring and related expense | | 2,038 | | | 5,341 | Interest expense, net | | 9,756 | | | 10,500 | Other income, net | | (514) | | | (3,129) | Loss before income taxes | $ | (40,937) | | $ | (26,981) |
| | | | | | | Three months ended | | March 31, | | March 31, | | 2026 | | 2025 | Segment depreciation expense: | | | | | | Cloud and Edge | $ | 2,322 | | $ | 2,353 | IP Optical Networks | | 2,138 | | | 1,116 | Depreciation expense | $ | 4,460 | | $ | 3,469 |
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