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Investments in Other Equity Securities Investments in Other Equity Securities (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Apr. 01, 2016 | Oct. 02, 2015 | Apr. 03, 2015 | Sep. 30, 2016 | Oct. 02, 2015 | Dec. 31, 2015 | Oct. 15, 2015 | Oct. 22, 2014 | Sep. 26, 2014 | Sep. 02, 2014
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost Method Investments Carrying Value |  | $ 4,100,000 |  |  |  | $ 4,100,000 |  | $ 5,400,000 |  |  |  |
Research and development |  | 24,202,000 |  | $ 21,679,000 |  | 74,272,000 | $ 65,824,000 |  |  |  |  |
Prepaid expenses and other current assets |  | 38,519,000 |  |  |  | 38,519,000 |  | 25,003,000 |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  | 1,259,000 |  | $ 0 |  | 2,735,000 | $ 2,505,000 |  |  |  |  |
VJU GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  | 9.90% |  | 19.80% |
Cost Method Investments Original Cost |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 |
Cost-method Investments, Other than Temporary Impairment |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |
Vislink plc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  | 3.30%
Cost Method Investments Original Cost |  |  |  |  |  |  |  |  |  |  |  | $ 3,300,000
Cost Method Investments Carrying Value |  | 500,000 |  |  |  | $ 500,000 |  | 1,800,000 |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax |  |  |  |  |  |  |  | 1,500,000 |  |  |  |
Period Stock Price Below Cost |  |  |  |  |  | 7 months |  |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  | 1,300,000 | $ 1,500,000 |  |  |  |  | $ 0 |  |  |  |
Stock Price Decrease, Percentage |  |  |  |  |  | 70.00% |  |  |  |  |  |
EDC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  | 18.40% |  |
Cost Method Investments Original Cost |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |
Cost-method Investments, Other than Temporary Impairment |  |  |  |  |  | $ 0 |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost Method Investments Carrying Value |  | 3,593,000 |  |  |  | 3,593,000 |  |  |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [1] | 3,593,000 |  |  |  | 3,593,000 |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [1] | 0 |  |  |  | 0 |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost Method Investments Carrying Value |  | 3,593,000 |  |  |  | 3,593,000 |  |  |  |  |  |
Business Acquisition, Transaction Costs | [2] | 100,000 |  |  |  | 100,000 |  |  |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [1],[2] | 3,593,000 |  |  |  | 3,593,000 |  |  |  |  |  |
Cost-method Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost Method Investments Carrying Value |  | 0 |  |  |  | 0 |  |  |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [1] | $ 0 |  |  |  | $ 0 |  |  |  |  |  |
[1] | The Company did not provide financial support to any of its unconsolidated VIEs and as of September 30, 2016, there were no explicit arrangements or implicit variable interests that could require the Company to provide financial support to any of its unconsolidated VIEs.
[2] | The Company’s maximum exposure to loss with respect to EDC as of September 30, 2016 was limited to a total investment cost of $3.6 million, including $0.1 million of transaction costs.

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