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Segment Reporting Net Sales and Operating Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Net sales $ 36,926 $ 39,730 $ 73,494 $ 76,106
Loss from operations (3,436) (6,679) (11,084) (12,913)
Net interest and other income 53 781 1,864 474
Loss from continuing operations before income tax expense (benefit) (3,383) (5,898) (9,220) (12,439)
Operating Segments        
Segment Reporting Information [Line Items]        
Loss from operations 738 (2,612) (2,382) (3,613)
Operating Segments | Mobile connectivity        
Segment Reporting Information [Line Items]        
Net sales 29,186 31,469 58,082 60,383
Loss from operations 584 (2,365) (1,715) (3,808)
Operating Segments | Inertial navigation        
Segment Reporting Information [Line Items]        
Net sales 7,740 8,261 15,412 15,723
Loss from operations 154 (247) (667) 195
Unallocated        
Segment Reporting Information [Line Items]        
Loss from operations $ (4,174) $ (4,067) $ (8,702) $ (9,300)