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Segment Reporting - Net Sales and Operating Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Net sales $ 41,112 $ 39,311 $ 114,606 $ 115,417
Loss from operations (503) (4,858) (11,587) (17,771)
Net interest and other (expense) income (143) 1,058 1,721 1,532
Loss from continuing operations before income tax (benefit) expense (646) (3,800) (9,866) (16,239)
Operating Segments        
Segment Reporting Information [Line Items]        
Loss from operations 3,693 (438) 1,311 (4,051)
Operating Segments | Mobile connectivity        
Segment Reporting Information [Line Items]        
Net sales 31,383 31,642 89,465 92,025
Loss from operations 2,285 (267) 570 (4,075)
Operating Segments | Inertial navigation        
Segment Reporting Information [Line Items]        
Net sales 9,729 7,669 25,141 23,392
Loss from operations 1,408 (171) 741 24
Unallocated        
Segment Reporting Information [Line Items]        
Loss from operations $ (4,196) $ (4,420) $ (12,898) $ (13,720)