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Segment Reporting - Deprecation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Depreciation $ 3,333 $ 2,511 $ 6,407 $ 4,913
Amortization expense 280 241 556 489
Operating Segments | Mobile connectivity        
Segment Reporting Information [Line Items]        
Depreciation 2,779 2,041 5,300 3,999
Amortization expense 280 241 556 489
Operating Segments | Inertial navigation        
Segment Reporting Information [Line Items]        
Depreciation 384 323 768 616
Amortization expense 0 0 0 0
Unallocated        
Segment Reporting Information [Line Items]        
Depreciation 170 147 339 298
Amortization expense $ 0 $ 0 $ 0 $ 0