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Segment Reporting - Deprecation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Depreciation expense $ 3,074 $ 2,402
Amortization expense 276 248
Operating Segments | Mobile connectivity    
Segment Reporting Information [Line Items]    
Depreciation expense 2,521 1,958
Amortization expense 276 248
Operating Segments | Inertial navigation    
Segment Reporting Information [Line Items]    
Depreciation expense 384 293
Amortization expense 0 0
Unallocated    
Segment Reporting Information [Line Items]    
Depreciation expense 169 151
Amortization expense $ 0 $ 0