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Segment Reporting - Deprecation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Depreciation	$ 2,624	$ 2,246	$ 7,537	$ 6,453
Amortization expense	251	237	740	732
Operating Segments | Mobile connectivity
Segment Reporting Information [Line Items]
Depreciation	2,160	1,824	6,159	5,163
Amortization expense	251	237	740	732
Operating Segments | Inertial navigation
Segment Reporting Information [Line Items]
Depreciation	318	280	934	874
Amortization expense	0	0	0	0
Unallocated
Segment Reporting Information [Line Items]
Depreciation	146	142	444	416
Amortization expense	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amortization expense

+ References

No definition available.

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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.

+ References

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