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Segment Reporting Segment Reporting - Net Sales and Operating Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Revenue, Net $ 40,449 $ 45,966 $ 80,660 $ 86,346
Operating Income (Loss) (1,368) (693) (5,838) (4,067)
Net interest and other expense (302) (91) (557) (438)
(Loss) income before income tax expense (1,670) (784) (6,395) (4,505)
Mobile Connectivity and Intertial Navigation Combined [Member]        
Segment Reporting Information [Line Items]        
Operating Income (Loss) 3,000 3,227 3,578 4,290
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Operating Income (Loss) (4,368) (3,920) (9,416) (8,357)
Operating Segments [Member] | Mobile Connectivity [Member]        
Segment Reporting Information [Line Items]        
Revenue, Net 34,034 36,890 68,321 72,155
Operating Income (Loss) 2,638 1,631 3,260 3,621
Operating Segments [Member] | Intertial Navigation [Member]        
Segment Reporting Information [Line Items]        
Revenue, Net 6,415 9,076 12,339 14,191
Operating Income (Loss) $ 362 $ 1,596 $ 318 $ 669