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Goodwill and Identified Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | (in thousands):
|  | Video |  | Cable Edge |  | Total
Balance as of December 31, 2015 |  | $ | 136,904 |  |  | $ | 60,877 |  |  | $ | 197,781 |
Goodwill from TVN acquisition |  | 41,670 |  |  | — |  |  | 41,670 |
Foreign currency translation adjustment |  | (2,055 | ) |  | (117 | ) |  | (2,172 | )
Balance as of December 31, 2016 |  | $ | 176,519 |  |  | $ | 60,760 |  |  | $ | 237,279 |
Summary of Identified Intangible Assets | The following is a summary of the Company’s identified intangible assets (in thousands):
|  |  | December 31, 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 | 3.2 |  | $ | 31,707 |  |  | $ | (15,216 | ) |  | $ | 16,491 |  |  | $ | 10,987 |  |  | $ | (10,987 | ) |  | $ | — |
Customer relationships/contracts | 4.2 |  | 44,384 |  |  | (32,098 | ) |  | 12,286 |  |  | 29,200 |  |  | (25,752 | ) |  | 3,448 |
Trademarks and tradenames | 3.2 |  | 573 |  |  | (119 | ) |  | 454 |  |  | — |  |  | — |  |  | — |
Maintenance agreements and related relationships | N/A |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (4,851 | ) |  | 649 |
Order Backlog | N/A |  | 3,011 |  |  | (3,011 | ) |  | — |  |  | — |  |  | — |  |  | — |
Total identifiable intangibles |  |  | $ | 85,175 |  |  | $ | (55,944 | ) |  | $ | 29,231 |  |  | $ | 45,687 |  |  | $ | (41,590 | ) |  | $ | 4,097 |
Purchased Intangibles Amortization Expense Allocation | Amortization expense for the identifiable intangible assets for the years ended December 31, 2016, 2015 and 2014 was allocated as follows (in thousands):
| December 31,
| 2016 |  | 2015 |  | 2014
Included in cost of revenue | $ | 4,434 |  |  | $ | 719 |  |  | $ | 13,745 |
Included in operating expenses | 10,402 |  |  | 5,783 |  |  | 6,775 |
Total amortization expense | $ | 14,836 |  |  | $ | 6,502 |  |  | $ | 20,520 |
Schedule of Finite-Lived Intangible Assets, Estimated Future Amortization Expense | The estimated future amortization expense of identifiable intangible assets with definite lives is as follows (in thousands):
| Cost of Revenue |  | Operating Expenses |  | Total
Year ended December 31, |  |  |  |  |
2017 | $ | 5,180 |  |  | $ | 3,092 |  |  | $ | 8,272 |
2018 | 5,180 |  |  | 3,092 |  |  | 8,272 |
2019 | 5,180 |  |  | 3,092 |  |  | 8,272 |
2020 | 951 |  |  | 2,972 |  |  | 3,923 |
2021 | — |  |  | 492 |  |  | 492 |
Total future amortization expense | $ | 16,491 |  |  | $ | 12,740 |  |  | $ | 29,231 |

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