| INTANGIBLE ASSETS AND GOODWILL |
(4) INTANGIBLE ASSETS AND GOODWILL The Company’s intangible assets at March 31, 2026 and December 31, 2025 consisted of the following (in thousands): | | | | | | | | | | | | | | Weighted | | | | | | | | | | average | | | | | | | | | | | | amortization | | | | | | | | Net | | | period | | | | | Accumulated | | carrying | March 31, 2026 | | (years) | | Cost | | amortization | | value | Developed technology | | 7.84 | | $ | 340,380 | | $ | 285,357 | | $ | 55,023 | Customer relationships | | 11.86 | | | 268,140 | | | 190,118 | | | 78,022 | Software licenses | | 3.00 | | | 6,855 | | | 5,667 | | | 1,188 | Trade names | | 3.88 | | | 5,000 | | | 5,000 | | | — | | | | | $ | 620,375 | | $ | 486,142 | | $ | 134,233 |
| | | | | | | | | | | | | | Weighted | | | | | | | | | | average | | | | | | | | | | | | amortization | | | | | | | | Net | | | period | | | | | Accumulated | | carrying | December 31, 2025 | | (years) | | Cost | | amortization | | value | Developed technology | | 7.84 | | $ | 340,380 | | $ | 281,000 | | $ | 59,380 | Customer relationships | | 11.86 | | | 268,140 | | | 184,462 | | | 83,678 | Software licenses | | 3.00 | | | 5,748 | | | 5,462 | | | 286 | Trade names | | 3.88 | | | 5,000 | | | 5,000 | | | — | | | | | $ | 619,268 | | $ | 475,924 | | $ | 143,344 |
Estimated future amortization expense for the Company’s intangible assets at March 31, 2026 was as follows (in thousands): | | | Years ending December 31, | | | Remainder of 2026 | $ | 29,292 | 2027 | | 34,347 | 2028 | | 23,769 | 2029 | | 18,380 | 2030 | | 7,723 | 2031 | | 5,927 | Thereafter | | 14,795 | | $ | 134,233 |
There were no changes to the carrying value of the Company’s goodwill in the three months ended March 31, 2026. The components of goodwill at both March 31, 2026 and December 31, 2025 were as follows (in thousands): | | | | | | | | | | Cloud and | | IP Optical | | | | | Edge | | Networks | | Total | Goodwill | $ | 392,302 | | $ | 191,996 | | $ | 584,298 | Accumulated impairment losses | | (167,406) | | | (116,000) | | | (283,406) | | $ | 224,896 | | $ | 75,996 | | $ | 300,892 |
|