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Goodwill and Identified Intangible Assets (Tables) | 9 Months Ended
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Sep. 25, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the nine months ended September 25, 2020 were as follows (in thousands):
| Video |  | Cable Access |  | Total
Balance as of December 31, 2019 | $ | 178,982 |  |  | $ | 60,798 |  |  | $ | 239,780 |
Foreign currency translation adjustment, net | 1,662 |  |  | (17 | ) |  | 1,645 |
Balance as of September 25, 2020 | $ | 180,644 |  |  | $ | 60,781 |  |  | $ | 241,425 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets, net (in thousands):
|  |  | September 25, 2020 |  | December 31, 2019
| Weighted Average Remaining Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed core technology | n/a |  | $ | 30,657 |  |  | $ | (30,657 | ) |  | $ | — |  |  | $ | 31,707 |  |  | $ | (30,757 | ) |  | $ | 950 |
Customer relationships/contracts | 0.4 |  | 44,715 |  |  | (43,459 | ) |  | 1,256 |  |  | 44,577 |  |  | (41,092 | ) |  | 3,485 |
Trademarks and trade names | n/a |  | 635 |  |  | (635 | ) |  | — |  |  | 609 |  |  | (583 | ) |  | 26 |
Maintenance agreements and related relationships | n/a |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order backlog | n/a |  | 3,137 |  |  | (3,137 | ) |  | — |  |  | 3,085 |  |  | (3,085 | ) |  | — |
Total identifiable intangibles, net |  |  | $ | 85,694 |  |  | $ | (84,438 | ) |  | $ | 1,256 |  |  | $ | 85,478 |  |  | $ | (81,017 | ) |  | $ | 4,461 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three and nine months ended September 25, 2020 and September 27, 2019 was allocated as follows (in thousands):
| Three months ended |  | Nine months ended
| September 25, 2020 |  | September 27, 2019 |  | September 25, 2020 |  | September 27, 2019
Included in cost of revenue | $ | — |  |  | $ | 1,295 |  |  | $ | 950 |  |  | $ | 3,885 |
Included in operating expenses | 752 |  |  | 785 |  |  | 2,264 |  |  | 2,357 |
Total amortization expense | $ | 752 |  |  | $ | 2,080 |  |  | $ | 3,214 |  |  | $ | 6,242 |
Estimated Future Amortization Expense of Purchased Intangible Assets | The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):
| Cost of Revenue |  | Operating Expenses |  | Total
Year ended December 31, |  |  |  |  |
2020 (remaining three months) | $ | — |  |  | $ | 754 |  |  | $ | 754 |
2021 | — |  |  | 502 |  |  | 502 |
Total future amortization expense | $ | — |  |  | $ | 1,256 |  |  | $ | 1,256 |

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