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Segment Reporting - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |
Depreciation | $ 10,659 | $ 8,798
Amortization expense | 1,004 | 980
Operating Segments | Mobile Connectivity |  |
Segment Reporting Information [Line Items] |  |
Depreciation | 8,726 | 7,084
Amortization expense | 1,004 | 980
Operating Segments | Intertial Navigation |  |
Segment Reporting Information [Line Items] |  |
Depreciation | 1,325 | 1,155
Amortization expense | 0 | 0
Unallocated, net |  |
Segment Reporting Information [Line Items] |  |
Depreciation | 608 | 559
Amortization expense | $ 0 | $ 0

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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