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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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- 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 + Details
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