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INTANGIBLE ASSETS AND GOODWILL (Tables)

12 Months Ended

Dec. 31, 2025

INTANGIBLE ASSETS AND GOODWILL

Schedule of intangible assets

The Company’s intangible assets at December 31, 2025 and 2024 consisted of the following (in thousands):

​	​	​	​	​	​	​	​	​	​	​	​
​	​ ​ ​	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
Trade names	​	3.88	​	​	5,000	​	​	5,000	​	​	—
Software licenses		3.00		​	5,748		​	5,462		​	286
​		​	​	$	619,268	​	$	475,924	​	$	143,344

​

​	​	​	​	​	​	​	​	​	​	​	​
​	​ ​ ​	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 December 31, 2025 was as follows (in thousands):

​	​	​	​
Years ending December 31,	​ ​ ​	​	​
2026	​	$	39,143
2027	​		33,976
2028	​		23,400
2029	​		18,380
2030	​	​	7,723
Thereafter	​	​	20,722
​	​	$	143,344

Schedule of goodwill

The components of goodwill at December 31, 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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