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Goodwill and Identified Intangible Assets (Tables) | 3 Months Ended
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Mar. 29, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three months ended March 29, 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 | (786 | ) |  | 16 |  |  | (770 | )
Balance as of March 29, 2019 | $ | 179,053 |  |  | $ | 60,795 |  |  | $ | 239,848 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets, net (in thousands):
|  |  | March 29, 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 | 0.9 |  | $ | 31,707 |  |  | $ | (26,871 | ) |  | $ | 4,836 |  |  | $ | 31,707 |  |  | $ | (25,576 | ) |  | $ | 6,131 |
Customer relationships/contracts | 1.9 |  | 44,583 |  |  | (38,855 | ) |  | 5,728 |  |  | 44,650 |  |  | (38,146 | ) |  | 6,504 |
Trademarks and trade names | 0.9 |  | 610 |  |  | (470 | ) |  | 140 |  |  | 623 |  |  | (441 | ) |  | 182 |
Maintenance agreements and related relationships | n/a |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order backlog | n/a |  | 3,087 |  |  | (3,087 | ) |  | — |  |  | 3,112 |  |  | (3,112 | ) |  | — |
Total identifiable intangibles |  |  | $ | 85,487 |  |  | $ | (74,783 | ) |  | $ | 10,704 |  |  | $ | 85,592 |  |  | $ | (72,775 | ) |  | $ | 12,817 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three months ended March 29, 2019 and March 30, 2018 was allocated as follows (in thousands):
| Three months ended
| March 29, 2019 |  | March 30, 2018
Included in cost of revenue | $ | 1,295 |  |  | $ | 1,295 |
Included in operating expenses | 788 |  |  | 804 |
Total amortization expense | $ | 2,083 |  |  | $ | 2,099 |
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 nine months) | $ | 3,885 |  |  | $ | 2,356 |  |  | $ | 6,241 |
2020 | 951 |  |  | 3,014 |  |  | 3,965 |
2021 | — |  |  | 498 |  |  | 498 |
Total future amortization expense | $ | 4,836 |  |  | $ | 5,868 |  |  | $ | 10,704 |

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