Segment Reporting Segment Reporting - Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue, Net	$ 40,211	$ 40,380
Operating Income (Loss)	(4,470)	(3,374)
Net interest and other expense	(255)	(347)
(Loss) income before income tax expense	(4,725)	(3,721)
Mobile Connectivity and Intertial Navigation Combined [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	578	1,063
Other Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(5,048)	(4,437)
Operating Segments [Member] \| Mobile Connectivity [Member]
Segment Reporting Information [Line Items]
Revenue, Net	34,287	35,265
Operating Income (Loss)	622	1,990
Operating Segments [Member] \| Intertial Navigation [Member]
Segment Reporting Information [Line Items]
Revenue, Net	5,924	5,115
Operating Income (Loss)	$ (44)	$ (927)

Net interest (income and expense) and other expense

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- Definition

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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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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