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Goodwill and Identified Intangible Assets (Tables) | 3 Months Ended
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Apr. 01, 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 | 39,206 |  |  | — |  |  | 39,206 |
Foreign currency translation adjustment | 933 |  |  | (21 | ) |  | 912 |
As of April 1, 2016 | $ | 177,043 |  |  | $ | 60,856 |  |  | $ | 237,899 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets (in thousands):
|  |  | April 1, 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 | 3.9 |  | $ | 31,488 |  |  | $ | (11,416 | ) |  | $ | 20,072 |  |  | $ | 10,987 |  |  | $ | (10,987 | ) |  | $ | — |
Customer relationships/contracts | 4.4 |  | 48,164 |  |  | (27,286 | ) |  | 20,878 |  |  | 29,200 |  |  | (25,752 | ) |  | 3,448 |
Trademarks and trade names | 3.9 |  | 605 |  |  | (13 | ) |  | 592 |  |  | — |  |  | — |  |  | — |
Maintenance agreements and related relationships | 0.5 |  | 5,500 |  |  | (5,080 | ) |  | 420 |  |  | 5,500 |  |  | (4,851 | ) |  | 649 |
Order Backlog | 0.4 |  | 3,690 |  |  | (615 | ) |  | 3,075 |  |  | — |  |  | — |  |  | — |
In-process R&D | n/a |  | 1,005 |  |  | — |  |  | 1,005 |  |  | — |  |  | — |  |  | — |
Total identifiable intangibles |  |  | $ | 90,452 |  |  | $ | (44,410 | ) |  | $ | 46,042 |  |  | $ | 45,687 |  |  | $ | (41,590 | ) |  | $ | 4,097 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three months ended April 1, 2016 and April 3, 2015 was allocated as follows (in thousands):
| Three months ended
| April 1, 2016 |  | April 3, 2015
Included in cost of revenue | $ | 418 |  |  | $ | 461 |
Included in operating expenses | 2,365 |  |  | 1,446 |
Total amortization expense | $ | 2,783 |  |  | $ | 1,907 |
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 nine months) | $ | 3,844 |  |  | $ | 8,747 |  |  | $ | 12,591 |
2017 | 5,125 |  |  | 4,195 |  |  | 9,320 |
2018 | 5,125 |  |  | 4,195 |  |  | 9,320 |
2019 | 5,125 |  |  | 4,195 |  |  | 9,320 |
2020 | 854 |  |  | 4,006 |  |  | 4,860 |
Thereafter | — |  |  | 631 |  |  | 631 |
Total future amortization expense | $ | 20,073 |  |  | $ | 25,969 |  |  | $ | 46,042 |

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