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Segment Reporting - Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Net sales | $ 36,568 | $ 36,376
Operating (loss) income | (7,648) | (6,234)
Net interest and other income (expense) | 1,811 | (307)
Loss from continuing operations before income tax expense (benefit) | (5,837) | (6,541)
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) income | (3,120) | (1,001)
Operating Segments | Mobile Connectivity |  |
Segment Reporting Information [Line Items] |  |
Net sales | 28,896 | 28,914
Operating (loss) income | (2,299) | (1,444)
Operating Segments | Intertial Navigation |  |
Segment Reporting Information [Line Items] |  |
Net sales | 7,672 | 7,462
Operating (loss) income | (821) | 443
Segment Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) income | $ (4,528) | $ (5,233)

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