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Investments in Equity Securities (Details) (USD $) | Sep. 26, 2014 | Dec. 31, 2013 | Sep. 26, 2014 VJU GmbH [Member] | Sep. 02, 2014 Vislink plc [Member] | Sep. 26, 2014 Cost-method Investments [Member] Variable Interest Entity, Not Primary Beneficiary [Member] VJU GmbH [Member] | Sep. 26, 2014 Research and development expense [Member] Variable Interest Entity, Not Primary Beneficiary [Member] VJU GmbH [Member]
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Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 19.80% | 3.30% |  |
Cost Method Investments Original Cost |  |  | $ 2,500,000 | $ 3,300,000 |  |
Prepaid expenses and other current assets | 26,852,000 | 21,521,000 |  | 3,300,000 |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  |  |  |  | 2,500,000 | 100,000
Cost Method Investments Carrying Value |  |  |  | $ 3,100,000 |  |

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