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Revenue from Contracts with Customers (ASC 606) - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | $ 36,568 | $ 36,376
Product |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 13,094 | 13,215
Product | Intertial Navigation |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 6,502 | 5,812
Service |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 23,474 | 23,161
Service | Mobile Connectivity |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 22,304 | 21,511
Service | Intertial Navigation |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 1,170 | 1,650
Transferred at Point in Time | Product | Mobile Connectivity |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 5,986 | 6,922
Transferred over Time | Product | Mobile Connectivity |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | $ 606 | $ 481

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- Definition Amount, including 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 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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