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Segment Reporting Segment Reporting - Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue, Net	$ 40,450	$ 45,846	$ 121,110	$ 132,192
Operating Income (Loss)	(1,801)	3,013	(7,639)	(1,054)
Net interest and other expense	(354)	(279)	(911)	(717)
(Loss) income before income tax expense	(2,155)	2,734	(8,550)	(1,771)
Mobile Connectivity and Intertial Navigation Combined [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	2,416	6,682	5,994	10,972
Other Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(4,217)	(3,669)	(13,633)	(12,026)
Operating Segments [Member] | Mobile Connectivity [Member]
Segment Reporting Information [Line Items]
Revenue, Net	32,762	36,453	101,083	108,608
Operating Income (Loss)	2,067	4,556	5,327	8,177
Operating Segments [Member] | Intertial Navigation [Member]
Segment Reporting Information [Line Items]
Revenue, Net	7,688	9,393	20,027	23,584
Operating Income (Loss)	$ 349	$ 2,126	$ 667	$ 2,795

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Net interest (income and expense) and other expense

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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