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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 39,235	$ 38,632	$ 75,270	$ 74,037
Deferred revenue recognized	1,254	1,193	2,590	2,408
Mobile connectivity product sales | Mobile Connectivity | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	6,697	6,731	12,374	13,401
Mobile connectivity product sales | Mobile Connectivity | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	1,371	1,372	2,756	2,622
Mobile connectivity service | Mobile Connectivity
Disaggregation of Revenue [Line Items]
Net sales	22,906	20,901	44,417	41,034
Inertial navigation product | Intertial Navigation
Disaggregation of Revenue [Line Items]
Net sales	6,626	8,059	12,438	14,131
Inertial navigation service | Intertial Navigation
Disaggregation of Revenue [Line Items]
Net sales	$ 1,635	$ 1,569	$ 3,285	$ 2,849

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

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+ References

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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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