Revenue from Contracts with Customers (ASC 606) Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 39,311	$ 39,312	$ 115,417	$ 113,349
Deferred revenue recognized	453	1,117	1,360	3,525
Mobile connectivity product sales \| Mobile connectivity \| Transferred at point in time
Disaggregation of Revenue [Line Items]
Net sales	7,540	6,297	22,536	19,698
Mobile connectivity product sales \| Mobile connectivity \| Transferred over time
Disaggregation of Revenue [Line Items]
Net sales	537	1,259	1,507	3,881
Mobile connectivity service \| Mobile connectivity
Disaggregation of Revenue [Line Items]
Net sales	23,565	21,664	67,982	62,698
Inertial navigation product \| Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	6,731	8,811	19,169	22,942
Inertial navigation service \| Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	$ 938	$ 1,281	$ 4,223	$ 4,130

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.

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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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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