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Goodwill and Identified Intangible Assets Goodwill and Identified Intangible Assets Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 segment | Jul. 01, 2016 USD ($) $ / shares | Dec. 31, 2016 USD ($) segment $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 $ / shares
Goodwill [Line Items] |  |  |  |  |  |  |
Market Capitalization |  | $ 235,000,000 |  |  |  | $ 400,000,000 |
Goodwill, Acquired During Period |  |  | $ 41,670,000 |  |  |  |
Number of reportable segments | segment | 2 |  | 2 |  |  |  |
Share Price | $ / shares |  | $ 3.01 | $ 5.00 |  |  | $ 5.10 | $ 5.93
Finite-lived Intangible Assets Acquired |  |  | $ 39,500,000 |  |  |  |
Intangibles, net |  |  | $ 29,231,000 | $ 4,097,000 |  |  |
Number of reporting units |  |  | 2 |  |  |  |
Goodwill |  |  | $ 237,279,000 | 197,781,000 |  |  |
Goodwill, Impairment Loss |  |  | 0 | 0 | $ 0 |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  |  | $ 8,272,000 |  |  |  |
Video [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 67.00% |  |  |  |
Goodwill, Acquired During Period |  |  | $ 41,670,000 |  |  |  |
Goodwill |  |  | $ 176,519,000 | 136,904,000 |  |  |
Cable Edge [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 123.00% |  |  |  |
Goodwill |  |  | $ 60,760,000 | $ 60,877,000 |  |  |
TVN [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) |  |  | 1,600,000 |  |  |  |
Goodwill, Acquired During Period |  |  | 41,700,000 |  |  |  |
Goodwill |  |  | 41,670,000 |  |  |  |
Intangibles |  |  | 41,100,000 |  |  |  |
Developed Technology Rights [Member] | TVN [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 4 years |  |  |  |  |
Intangibles |  |  | $ 21,700,000 |  |  |  |

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