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Goodwill and Identified Intangible Assets (Tables) | 6 Months Ended
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Jun. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the six months ended June 26, 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 | 67 |  |  | (31 | ) |  | 36 |
Balance as of June 26, 2020 | $ | 179,049 |  |  | $ | 60,767 |  |  | $ | 239,816 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets, net (in thousands):
|  |  | June 26, 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 |  | $ | 31,707 |  |  | $ | (31,707 | ) |  | $ | — |  |  | $ | 31,707 |  |  | $ | (30,757 | ) |  | $ | 950 |
Customer relationships/contracts | 0.7 |  | 44,588 |  |  | (42,595 | ) |  | 1,993 |  |  | 44,577 |  |  | (41,092 | ) |  | 3,485 |
Trademarks and trade names | n/a |  | 611 |  |  | (611 | ) |  | — |  |  | 609 |  |  | (583 | ) |  | 26 |
Maintenance agreements and related relationships | n/a |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order backlog | n/a |  | 3,089 |  |  | (3,089 | ) |  | — |  |  | 3,085 |  |  | (3,085 | ) |  | — |
Total identifiable intangibles, net |  |  | $ | 85,495 |  |  | $ | (83,502 | ) |  | $ | 1,993 |  |  | $ | 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 six months ended June 26, 2020 and June 28, 2019 was allocated as follows (in thousands):
| Three months ended |  | Six months ended
| June 26, 2020 |  | June 28, 2019 |  | June 26, 2020 |  | June 28, 2019
Included in cost of revenue | $ | 65 |  |  | $ | 1,295 |  |  | $ | 950 |  |  | $ | 2,590 |
Included in operating expenses | 742 |  |  | 784 |  |  | 1,512 |  |  | 1,572 |
Total amortization expense | $ | 807 |  |  | $ | 2,079 |  |  | $ | 2,462 |  |  | $ | 4,162 |
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 six months) | $ | — |  |  | $ | 1,495 |  |  | $ | 1,495 |
2021 | — |  |  | 498 |  |  | 498 |
Total future amortization expense | $ | — |  |  | $ | 1,993 |  |  | $ | 1,993 |

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