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Goodwill and Identified Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | reportable segments for the three months ended March 31, 2017 were as follows (in thousands):
| Video |  | Cable Edge |  | Total
Balance as of December 31, 2016 | $ | 176,519 |  |  | $ | 60,760 |  |  | $ | 237,279 |
Foreign currency translation adjustment | 625 |  |  | 7 |  |  | 632 |
Balance as of March 31, 2017 | $ | 177,144 |  |  | $ | 60,767 |  |  | $ | 237,911 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets (in thousands):
|  |  | March 31, 2017 |  | December 31, 2016
| Weighted Average Remaining Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed core technology | 2.9 |  | $ | 31,708 |  |  | $ | (16,512 | ) |  | $ | 15,196 |  |  | $ | 31,707 |  |  | $ | (15,216 | ) |  | $ | 16,491 |
Customer relationships/contracts | 3.9 |  | 44,433 |  |  | (32,845 | ) |  | 11,588 |  |  | 44,384 |  |  | (32,098 | ) |  | 12,286 |
Trademarks and trade names | 2.9 |  | 582 |  |  | (158 | ) |  | 424 |  |  | 573 |  |  | (119 | ) |  | 454 |
Maintenance agreements and related relationships | N/A |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order Backlog | N/A |  | 3,011 |  |  | (3,011 | ) |  | — |  |  | 3,011 |  |  | (3,011 | ) |  | — |
Total identifiable intangibles |  |  | $ | 85,234 |  |  | $ | (58,026 | ) |  | $ | 27,208 |  |  | $ | 85,175 |  |  | $ | (55,944 | ) |  | $ | 29,231 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three months ended March 31, 2017 and April 1, 2016 was allocated as follows (in thousands):
| Three months ended
| March 31, 2017 |  | April 1, 2016
Included in cost of revenue | $ | 1,295 |  |  | $ | 418 |
Included in operating expenses | 774 |  |  | 2,365 |
Total amortization expense | $ | 2,069 |  |  | $ | 2,783 |
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, |  |  |  |  |
2017 (remaining nine months) | $ | 3,885 |  |  | $ | 2,328 |  |  | $ | 6,213 |
2018 | 5,180 |  |  | 3,104 |  |  | 8,284 |
2019 | 5,180 |  |  | 3,104 |  |  | 8,284 |
2020 | 951 |  |  | 2,983 |  |  | 3,934 |
2021 | — |  |  | 493 |  |  | 493 |
Total future amortization expense | $ | 15,196 |  |  | $ | 12,012 |  |  | $ | 27,208 |

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