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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 36,926	$ 39,730	$ 73,494	$ 76,106
Mobile connectivity product sales | Mobile connectivity | Transferred at point in time
Disaggregation of Revenue [Line Items]
Net sales	6,080	8,074	12,066	14,996
Mobile connectivity product sales | Mobile connectivity | Transferred over time
Disaggregation of Revenue [Line Items]
Net sales	623	489	1,229	970
Mobile connectivity service | Mobile connectivity
Disaggregation of Revenue [Line Items]
Net sales	22,483	22,906	44,787	44,417
Inertial navigation product | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	7,246	6,626	13,748	12,438
Inertial navigation service | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	$ 494	$ 1,635	$ 1,664	$ 3,285

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No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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