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Segment Reporting - Deprecation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Depreciation $ 3,466 $ 3,333 $ 6,839 $ 6,407
Amortization expense 125 280 319 556
Operating Segments | Mobile connectivity        
Segment Reporting Information [Line Items]        
Depreciation 3,003 2,779 5,895 5,300
Amortization expense 125 280 319 556
Operating Segments | Inertial navigation        
Segment Reporting Information [Line Items]        
Depreciation 296 384 604 768
Amortization expense 0 0 0 0
Unallocated        
Segment Reporting Information [Line Items]        
Depreciation 167 170 340 339
Amortization expense $ 0 $ 0 $ 0 $ 0