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Goodwill and Identified Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The following table presents goodwill by reportable segments (in thousands):
| Video |  | Cable Edge |  | Total
As of December 31, 2015 | $ | 136,904 |  |  | $ | 60,877 |  |  | $ | 197,781 |
Preliminary estimate of goodwill from TVN acquisition | 41,670 |  |  | — |  |  | 41,670 |
Foreign currency translation adjustment | 515 |  |  | (86 | ) |  | 429 |
As of September 30, 2016 | $ | 179,089 |  |  | $ | 60,791 |  |  | $ | 239,880 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets (in thousands):
|  |  | September 30, 2016 |  | December 31, 2015
| Weighted Average Remaining Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed core technology | 3.4 |  | $ | 33,057 |  |  | $ | (14,112 | ) |  | $ | 18,945 |  |  | $ | 10,987 |  |  | $ | (10,987 | ) |  | $ | — |
Customer relationships/contracts | 4.4 |  | 44,659 |  |  | (31,004 | ) |  | 13,655 |  |  | 29,200 |  |  | (25,752 | ) |  | 3,448 |
Trademarks and trade names | 3.4 |  | 610 |  |  | (89 | ) |  | 521 |  |  | — |  |  | — |  |  | — |
Maintenance agreements and related relationships | N/A |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (4,851 | ) |  | 649 |
Order Backlog | N/A |  | 3,661 |  |  | (3,661 | ) |  | — |  |  | — |  |  | — |  |  | — |
Total identifiable intangibles |  |  | $ | 87,487 |  |  | $ | (54,366 | ) |  | $ | 33,121 |  |  | $ | 45,687 |  |  | $ | (41,590 | ) |  | $ | 4,097 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three and nine months ended September 30, 2016 and October 2, 2015 was allocated as follows (in thousands):
| Three months ended |  | Nine months ended
| September 30, 2016 |  | October 2, 2015 |  | September 30, 2016 |  | October 2, 2015
Included in cost of revenue | $ | 1,380 |  |  | $ | 86 |  |  | $ | 3,105 |  |  | $ | 633 |
Included in operating expenses | 3,009 |  |  | 1,446 |  |  | 9,606 |  |  | 4,338 |
Total amortization expense | $ | 4,389 |  |  | $ | 1,532 |  |  | $ | 12,711 |  |  | $ | 4,971 |
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, |  |  |  |  |
2016 (remaining three months) | $ | 1,380 |  |  | $ | 811 |  |  | $ | 2,191 |
2017 | 5,517 |  |  | 3,244 |  |  | 8,761 |
2018 | 5,517 |  |  | 3,244 |  |  | 8,761 |
2019 | 5,517 |  |  | 3,244 |  |  | 8,761 |
2020 | 1,014 |  |  | 3,117 |  |  | 4,131 |
Thereafter | — |  |  | 516 |  |  | 516 |
Total future amortization expense | $ | 18,945 |  |  | $ | 14,176 |  |  | $ | 33,121 |

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