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INTANGIBLE ASSETS AND GOODWILL (Tables) | 9 Months Ended
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Sep. 30, 2025
INTANGIBLE ASSETS AND GOODWILL |
Schedule of intangible assets | The Company’s intangible assets at September 30, 2025 and December 31, 2024 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | amortization | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net
​ | ​ | period |  | ​ | ​ |  | Accumulated |  | carrying
September 30, 2025 |  | (years) | ​ | Cost |  | amortization |  | value
Developed technology | ​ | 7.84 | ​ | $ | 340,380 | ​ | $ | 276,492 | ​ | $ | 63,888
Customer relationships | ​ | 11.86 | ​ | ​ | 268,140 | ​ | ​ | 178,676 | ​ | ​ | 89,464
Trade names | ​ | 3.88 | ​ | ​ | 5,000 | ​ | ​ | 5,000 | ​ | ​ | —
Software licenses |  | 3.00 |  | ​ | 5,748 |  | ​ | 5,348 |  | ​ | 400
​ |  | ​ | ​ | $ | 619,268 | ​ | $ | 465,516 | ​ | $ | 153,752
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | amortization | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net
​ | ​ | period |  | ​ | ​ |  | Accumulated |  | carrying
December 31, 2024 |  | (years) | ​ | Cost |  | amortization |  | value
Developed technology | ​ | 7.84 | ​ | $ | 340,380 | ​ | $ | 262,085 | ​ | $ | 78,295
Customer relationships | ​ | 11.86 | ​ | ​ | 268,140 | ​ | ​ | 160,635 | ​ | ​ | 107,505
Trade names | ​ | 3.88 | ​ | ​ | 5,000 | ​ | ​ | 4,978 | ​ | ​ | 22
Software licenses |  | 3.00 |  | ​ | 5,748 |  | ​ | 4,033 |  | ​ | 1,715
​ |  | ​ | ​ | $ | 619,268 | ​ | $ | 431,731 | ​ | $ | 187,537
Schedule of estimated future amortization expense for intangible assets | ​ Estimated future amortization expense for the Company’s intangible assets at September 30, 2025 was as follows (in thousands):
​ | ​ | ​ | ​
Years ending December 31, |  |  | ​
Remainder of 2025 | ​ | $ | 10,407
2026 | ​ |  | 39,143
2027 | ​ |  | 33,979
2028 | ​ |  | 23,400
2029 | ​ |  | 18,379
2030 | ​ | ​ | 7,722
Thereafter | ​ | ​ | 20,722
​ | ​ | $ | 153,752
Schedule of goodwill | The components of goodwill at both September 30, 2025 and 2024 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
​

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