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ASC 606 and Business and Credit Concentrations Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Contracts Revenue	$ 40,101
Mobile Comm Product Sales [Member] | Mobile Connectivity [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Contracts Revenue	6,670
Mobile Comm Product Sales [Member] | Mobile Connectivity [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Contracts Revenue	1,250
Mobile Comm Services Sales [Member] | Mobile Connectivity [Member]
Disaggregation of Revenue [Line Items]
Contracts Revenue	24,829
Inertial Navigation Product Sales [Member] | Intertial Navigation [Member]
Disaggregation of Revenue [Line Items]
Contracts Revenue	6,072
FOG System Sales [Member] | Intertial Navigation [Member]
Disaggregation of Revenue [Line Items]
Contracts Revenue	$ 1,280

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- Definition

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.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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

+ Details

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- Details

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- Details

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- Details

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- Details

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X

- Details

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