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Goodwill and Identified Intangible Assets (Tables) | 9 Months Ended
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Sep. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill by reportable segments for the nine months ended September 28, 2018 were as follows (in thousands):
| Video |  | Cable Access |  | Total
Balance as of December 31, 2017 | $ | 182,012 |  |  | $ | 60,815 |  |  | $ | 242,827 |
Foreign currency translation adjustment | (1,297 | ) |  | (18 | ) |  | (1,315 | )
Balance as of September 28, 2018 | $ | 180,715 |  |  | $ | 60,797 |  |  | $ | 241,512 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets, net (in thousands):
|  |  | September 28, 2018 |  | December 31, 2017
| Weighted Average Remaining Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed core technology | 1.4 |  | $ | 31,707 |  |  | $ | (24,281 | ) |  | $ | 7,426 |  |  | $ | 31,707 |  |  | $ | (20,396 | ) |  | $ | 11,311 |
Customer relationships/contracts | 2.4 |  | 44,718 |  |  | (37,431 | ) |  | 7,287 |  |  | 44,819 |  |  | (35,205 | ) |  | 9,614 |
Trademarks and trade names | 1.4 |  | 635 |  |  | (410 | ) |  | 225 |  |  | 654 |  |  | (300 | ) |  | 354 |
Maintenance agreements and related relationships | n/a |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order Backlog | n/a |  | 3,138 |  |  | (3,138 | ) |  | — |  |  | 3,177 |  |  | (3,177 | ) |  | — |
Total identifiable intangibles |  |  | $ | 85,698 |  |  | $ | (70,760 | ) |  | $ | 14,938 |  |  | $ | 85,857 |  |  | $ | (64,578 | ) |  | $ | 21,279 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three and nine months ended September 28, 2018 and September 29, 2017 was allocated as follows (in thousands):
| Three months ended | Nine months ended
| September 28, 2018 |  | September 29, 2017 | September 28, 2018 |  | September 29, 2017
Included in cost of revenue | $ | 1,295 |  |  | $ | 1,295 |  | $ | 3,885 |  |  | $ | 3,885 |
Included in operating expenses | 792 |  |  | 793 |  | 2,396 |  |  | 2,347 |
Total amortization expense | $ | 2,087 |  |  | $ | 2,088 |  | $ | 6,281 |  |  | $ | 6,232 |
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, |  |  |  |  |
2018 (remaining three months) | $ | 1,295 |  |  | $ | 794 |  |  | $ | 2,089 |
2019 | 5,180 |  |  | 3,174 |  |  | 8,354 |
2020 | 951 |  |  | 3,042 |  |  | 3,993 |
2021 | — |  |  | 502 |  |  | 502 |
Total future amortization expense | $ | 7,426 |  |  | $ | 7,512 |  |  | $ | 14,938 |

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