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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)

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