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Segment Reporting Net Sales and Operating Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Net sales $ 39,235 $ 38,632 $ 75,270 $ 74,037
Loss from operations (6,833) (2,580) (12,981) (6,412)
Net interest and other income (expense) 780 263 474 (306)
Loss from continuing operations before income tax (benefit) expense (6,053) (2,317) (12,507) (6,718)
Operating Segments        
Segment Reporting Information [Line Items]        
Loss from operations (2,766) 1,321 (3,681) 2,074
Operating Segments | Mobile Connectivity        
Segment Reporting Information [Line Items]        
Net sales 30,974 29,004 59,547 57,057
Loss from operations (2,519) (243) (3,876) 176
Operating Segments | Intertial Navigation        
Segment Reporting Information [Line Items]        
Net sales 8,261 9,628 15,723 16,980
Loss from operations (247) 1,564 195 1,898
Unallocated        
Segment Reporting Information [Line Items]        
Loss from operations $ (4,067) $ (3,901) $ (9,300) $ (8,486)