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Segment Reporting (Details Textual) - Sales | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Product Sales Concentration Risk | Mobile Connectivity |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 18.00% | 20.00% | 23.00%
Geographic Concentration Risk | Non-US |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 61.00% | 62.00% | 63.00%
Geographic Concentration Risk | Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage |  |  | 11.00%
Mini-VSAT Broadband Airtime Service | Service Sales Concentration Risk | Mobile Connectivity |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 41.00% | 41.00% | 37.00%
Content and Training Services | Service Sales Concentration Risk | Mobile Connectivity |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 17.00% | 20.00% | 20.00%
FOG-based Guidance and Navigation Systems | Product Sales Concentration Risk | Intertial Navigation |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 16.00% | 13.00% | 10.00%

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