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Segment Reporting - Net Sales and Operating Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 170,761 | $ 160,088 | $ 176,122
Operating income (loss) | $ (1,877) | $ (920) | $ (1,187) | $ (3,180) | $ (1,125) | $ (1,801) | $ (1,368) | $ (4,470) | (7,164) | (8,764) | (1,322)
Net interest and other expense |  |  |  |  |  |  |  |  | (503) | (1,174) | (648)
Loss before income tax expense |  |  |  |  |  |  |  |  | (7,667) | (9,938) | (1,970)
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 9,080 | 7,890 | 15,313
Operating Segments | Mobile Connectivity |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 133,658 | 132,227 | 141,507
Operating income (loss) |  |  |  |  |  |  |  |  | 4,163 | 7,334 | 10,041
Operating Segments | Intertial Navigation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 37,103 | 27,861 | 34,615
Operating income (loss) |  |  |  |  |  |  |  |  | 4,917 | 556 | 5,272
Unallocated, net |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | $ (16,244) | $ (16,654) | $ (16,635)

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