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Segment Reporting - Deprecation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Depreciation $ 3,373 $ 3,074
Amortization expense 194 276
Operating Segments | Mobile connectivity    
Segment Reporting Information [Line Items]    
Depreciation 2,892 2,521
Amortization expense 194 276
Operating Segments | Inertial navigation    
Segment Reporting Information [Line Items]    
Depreciation 308 384
Amortization expense 0 0
Unallocated    
Segment Reporting Information [Line Items]    
Depreciation 173 169
Amortization expense $ 0 $ 0