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Revenue from Contracts with Customers (ASC 606) Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 43,392	$ 83,493
Mobile Connectivity Product Sales [Member] | Mobile Connectivity [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	6,731	13,401
Mobile Connectivity Product Sales [Member] | Mobile Connectivity [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,372	2,622
Mobile Comm Services Sales [Member] | Mobile Connectivity [Member]
Disaggregation of Revenue [Line Items]
Revenues	25,661	50,490
Inertial Navigation Product Sales [Member] | Intertial Navigation [Member]
Disaggregation of Revenue [Line Items]
Revenues	8,059	14,131
Inertial Navigation Service Sales [Member] | Intertial Navigation [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 1,569	$ 2,849

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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.

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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

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