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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill Goodwill relates to Parent’s acquisition of Array. At the acquisition date, July 8, 2016, goodwill was $121.6 million. At December 31, 2019 and September 30, 2020 goodwill totaled $69.7 million, net of accumulated impairment of $51.9 million and is not deductible for tax purposes. Other Intangible Assets Other intangible assets consisted of the following (in thousands):
| Estimated Useful Lives (Years) |  | September 30, 2020 |  | December 31, 2019
Amortizable: |  |  |  |  |
Costs: |  |  |  |  |
Developed technology | 14 |  | $ | 203,800 |  |  | $ | 203,800 |
Customer relationship | 10 |  | 89,500 |  |  | 89,500 |
Internal-use software modification | 2.5 |  | 4,356 |  |  | 4,356 |
Total Amortizable Intangibles |  |  | 297,656 |  |  | 297,656 |
Accumulated amortization: |  |  |  |  |
Developed technology |  |  | 61,594 |  |  | 50,676 |
Customer relationship |  |  | 37,869 |  |  | 31,157 |
Internal-use software modification costs |  |  | 3,920 |  |  | 2,613 |
Total Accumulated Amortization |  |  | 103,383 |  |  | 84,446 |
Total Amortizable Intangibles, Net |  |  | 194,273 |  |  | 213,210 |
Non-amortizable costs: |  |  |  |  |
Trade name |  |  | 10,300 |  |  | 10,300 |
Total Other Intangible Assets, Net |  |  | $ | 204,573 |  |  | $ | 223,510 |
Amortization expense related to intangible assets amounted to $6.3 million for the three months ended September 30, 2020 and 2019 and $18.9 million for the nine months ended September 30, 2020 and 2019, respectively. Estimated future annual amortization expense for the above amortizable intangible assets for the remaining periods through December 31, as follows (in thousands):
| Amount
2020 | $ | 6,313 |
2021 | 23,507 |
2022 | 23,507 |
2023 | 23,507 |
2024 | 23,507 |
Thereafter | 93,932 |
| $ | 194,273 |

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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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