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INTANGIBLE ASSETS AND GOODWILL | 3 Months Ended
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Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
INTANGIBLE ASSETS AND GOODWILL | INTANGIBLE ASSETS AND GOODWILL The Company's intangible assets at March 31, 2022 and December 31, 2021 consisted of the following (in thousands):
March 31, 2022 | Weighted average amortization period (years) |  | Cost |  | Accumulated amortization |  | Net carrying value
In-process research and development | * |  | $ | 34,000 |  |  | $ | — |  |  | $ | 34,000 |
Developed technology | 7.93 |  | 306,380 |  |  | 189,660 |  |  | 116,720 |
Customer relationships | 11.86 |  | 268,140 |  |  | 84,651 |  |  | 183,489 |
Trade names | 3.88 |  | 5,000 |  |  | 4,021 |  |  | 979 |
Internal use software | 3.00 |  | 730 |  |  | 730 |  |  | — |
| 9.17 |  | $ | 614,250 |  |  | $ | 279,062 |  |  | $ | 335,188 |
December 31, 2021 | Weighted average amortization period (years) |  | Cost |  | Accumulated amortization |  | Net carrying value
In-process research and development | * |  | $ | 34,000 |  |  | $ | — |  |  | $ | 34,000 |
Developed technology | 7.93 |  | 306,380 |  |  | 181,393 |  |  | 124,987 |
Customer relationships | 11.86 |  | 268,140 |  |  | 77,653 |  |  | 190,487 |
Trade names | 3.88 |  | 5,000 |  |  | 3,744 |  |  | 1,256 |
Internal use software | 3.00 |  | 730 |  |  | 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. Estimated future amortization expense for the Company's intangible assets at March 31, 2022 was as follows (in thousands):
Years ending December 31, |
Remainder of 2022 | $ | 44,907 |
2023 | 53,966 |
2024 | 46,899 |
2025 | 40,338 |
2026 | 36,489 |
2027 | 31,634 |
Thereafter | 80,955 |
| $ | 335,188 |
There were no changes to the carrying value of the Company's goodwill in the three months ended March 31, 2022 or 2021. The components of goodwill at March 31, 2022 and March 31, 2021 were as follows (in thousands):
| Cloud and Edge |  | IP Optical Networks |  | Total
Balance at March 31, 2022 |  |  |  |  |
Goodwill | $ | 392,302 |  |  | $ | 191,996 |  |  | $ | 584,298 |
Accumulated impairment losses | (167,406) |  |  | (116,000) |  |  | (283,406) |
| $ | 224,896 |  |  | $ | 75,996 |  |  | $ | 300,892 |
Balance at March 31, 2021 |  |  |  |  |
Goodwill | $ | 392,302 |  |  | $ | 191,996 |  |  | $ | 584,298 |
Accumulated impairment losses | (167,406) |  |  | — |  |  | (167,406) |
| $ | 224,896 |  |  | $ | 191,996 |  |  | $ | 416,892 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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