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Segment Reporting Deprecation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Depreciation	$ 2,511	$ 2,114	$ 4,913	$ 4,207
Amortization expense	241	247	489	495
Operating Segments | Mobile connectivity
Segment Reporting Information [Line Items]
Depreciation	2,041	1,669	3,999	3,339
Amortization expense	241	247	489	495
Operating Segments | Inertial navigation
Segment Reporting Information [Line Items]
Depreciation	323	307	616	594
Amortization expense	0	0	0	0
Unallocated
Segment Reporting Information [Line Items]
Depreciation	147	138	298	274
Amortization expense	$ 0	$ 0	$ 0	$ 0

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- Definition

Amortization expense

+ References

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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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.

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