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Revenue from Contracts with Customers (ASC 606) - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 41,112	$ 39,311	$ 114,606	$ 115,417
Mobile connectivity product sales | Mobile connectivity | Transferred at point in time
Disaggregation of Revenue [Line Items]
Net sales	6,671	7,540	18,737	22,536
Mobile connectivity product sales | Mobile connectivity | Transferred over time
Disaggregation of Revenue [Line Items]
Net sales	549	537	1,778	1,507
Mobile connectivity service | Mobile connectivity
Disaggregation of Revenue [Line Items]
Net sales	24,163	23,565	68,950	67,982
Inertial navigation product | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	9,430	6,731	23,178	19,169
Inertial navigation service | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	$ 299	$ 938	$ 1,963	$ 4,223

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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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