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INTANGIBLE ASSETS AND GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
The Company's intangible assets at December 31, 2022 and 2021 consisted of the following (in thousands):
December 31, 2022Weighted average amortization period
(years)		CostAccumulated
amortization		Net
carrying value
Developed technology7.84$340,380 $212,448 $127,932 
Customer relationships11.86268,140 106,385 161,755 
Trade names3.885,000 4,658 342 
Software licenses3.005,186 487 4,699 
9.51$618,706 $323,978 $294,728 

December 31, 2021Weighted average amortization period
(years)		CostAccumulated
amortization		Net
carrying value
In-process research and development*$34,000 $— $34,000 
Developed technology7.93306,380 181,393 124,987 
Customer relationships11.86268,140 77,653 190,487 
Trade names3.885,000 3,744 1,256 
Internal use software3.00730 730 — 
9.17$614,250 $263,520 $350,730 

* An in-process research and development intangible asset has an indefinite life until the product is generally available, at which time such asset is typically reclassified to developed technology and the Company begins to amortize the asset. In the fourth quarter of 2022, the Company reclassified an in-process research and development intangible asset to developed technology, as the associated products and features related to 5G technology became generally available.
Schedule of estimated future amortization expense for intangible assets
Estimated future amortization expense for the Company's intangible assets at December 31, 2022 was as follows (in thousands):
Years ending December 31,
2023$56,882 
202450,717 
202544,006 
202638,965 
202733,936 
Thereafter70,222 
$294,728 
Schedule of goodwill
The changes in the carrying value of the Company's goodwill in the years ended December 31, 2022 and 2021 were as follows (in thousands):
Cloud and EdgeIP Optical NetworksTotal
Balance at January 1, 2021 (1)
$224,896 $191,996 $416,892 
Impairment of goodwill— (116,000)(116,000)
Balance at December 31, 2021 (1)(2)
224,896 75,996 300,892 
Activity— — — 
Balance at December 31, 2022 (1)(2)
$224,896 $75,996 $300,892 

(1) Balance is presented net of accumulated impairment losses of $167.4 million for the Cloud and Edge segment.
(2) Balance is presented net of an impairment loss of $116.0 million for the IP Optical Networks segment.

The components of goodwill at December 31, 2021 and 2022 were as follows (in thousands):
Cloud and EdgeIP Optical NetworksTotal
Balance at December 31, 2021
  Goodwill$392,302 $191,996 $584,298 
  Accumulated impairment losses(167,406)(116,000)(283,406)
224,896 75,996 300,892 
Balance at December 31, 2022
  Goodwill$392,302 $191,996 $584,298 
  Accumulated impairment losses(167,406)(116,000)(283,406)
$224,896 $75,996 $300,892