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Revenue from Contracts with Customers (ASC 606) - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from External Customer [Line Items] |  |  |
Total net sales | $ 170,761 | $ 160,088 | $ 176,122
Product |  |  |
Revenue from External Customer [Line Items] |  |  |
Total net sales | 63,277 | 56,968 | 73,075
Service |  |  |
Revenue from External Customer [Line Items] |  |  |
Total net sales | 107,484 | $ 103,120 | $ 103,047
Mobile Connectivity | Service |  |  |
Revenue from External Customer [Line Items] |  |  |
Total net sales | 102,307 |  |
Intertial Navigation | Product |  |  |
Revenue from External Customer [Line Items] |  |  |
Total net sales | 31,926 |  |
Intertial Navigation | Service |  |  |
Revenue from External Customer [Line Items] |  |  |
Total net sales | 5,177 |  |
Transferred at point in time | Mobile Connectivity | Product |  |  |
Revenue from External Customer [Line Items] |  |  |
Total net sales | 26,086 |  |
Transferred over time | Mobile Connectivity | Product |  |  |
Revenue from External Customer [Line Items] |  |  |
Total net sales | $ 5,265 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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