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Goodwill and Identified Intangible Assets (Tables) | 6 Months Ended
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Jun. 28, 2019
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 28, 2019 were as follows (in thousands):
| Video |  | Cable Access |  | Total
Balance as of December 31, 2018 | $ | 179,839 |  |  | $ | 60,779 |  |  | $ | 240,618 |
Foreign currency translation adjustment, net | (282 | ) |  | (1 | ) |  | (283 | )
Balance as of June 28, 2019 | $ | 179,557 |  |  | $ | 60,778 |  |  | $ | 240,335 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets, net (in thousands):
|  |  | June 28, 2019 |  | December 31, 2018
| Weighted Average Remaining Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed core technology | 0.7 |  | $ | 31,708 |  |  | $ | (28,167 | ) |  | $ | 3,541 |  |  | $ | 31,707 |  |  | $ | (25,576 | ) |  | $ | 6,131 |
Customer relationships/contracts | 1.7 |  | 44,628 |  |  | (39,632 | ) |  | 4,996 |  |  | 44,650 |  |  | (38,146 | ) |  | 6,504 |
Trademarks and trade names | 0.7 |  | 618 |  |  | (515 | ) |  | 103 |  |  | 623 |  |  | (441 | ) |  | 182 |
Maintenance agreements and related relationships | n/a |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order backlog | n/a |  | 3,104 |  |  | (3,104 | ) |  | — |  |  | 3,112 |  |  | (3,112 | ) |  | — |
Total identifiable intangibles, net |  |  | $ | 85,558 |  |  | $ | (76,918 | ) |  | $ | 8,640 |  |  | $ | 85,592 |  |  | $ | (72,775 | ) |  | $ | 12,817 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three and six months ended June 28, 2019 and June 29, 2018 was allocated as follows (in thousands):
| Three months ended |  | Six months ended
| June 28, 2019 |  | June 29, 2018 |  | June 28, 2019 |  | June 29, 2018
Included in cost of revenue | $ | 1,295 |  |  | $ | 1,295 |  |  | $ | 2,590 |  |  | $ | 2,590 |
Included in operating expenses | 784 |  |  | 800 |  |  | 1,572 |  |  | 1,604 |
Total amortization expense | $ | 2,079 |  |  | $ | 2,095 |  |  | $ | 4,162 |  |  | $ | 4,194 |
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, |  |  |  |  |
2019 (remaining six months) | $ | 2,590 |  |  | $ | 1,576 |  |  | $ | 4,166 |
2020 | 951 |  |  | 3,023 |  |  | 3,974 |
2021 | — |  |  | 500 |  |  | 500 |
Total future amortization expense | $ | 3,541 |  |  | $ | 5,099 |  |  | $ | 8,640 |

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