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Revenue from Contracts with Customers (ASC 606) - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Net sales $ 41,837 $ 43,363 $ 82,931 $ 85,655
Mobile connectivity product sales | Mobile connectivity | Transferred at point in time        
Disaggregation of Revenue [Line Items]        
Net sales 5,976 7,292 12,083 13,380
Mobile connectivity product sales | Mobile connectivity | Transferred over time        
Disaggregation of Revenue [Line Items]        
Net sales 644 754 1,100 1,557
Mobile connectivity service | Mobile connectivity        
Disaggregation of Revenue [Line Items]        
Net sales 27,933 25,709 54,521 49,325
Inertial navigation product | Inertial navigation        
Disaggregation of Revenue [Line Items]        
Net sales 6,959 9,223 14,766 20,764
Inertial navigation service | Inertial navigation        
Disaggregation of Revenue [Line Items]        
Net sales $ 325 $ 385 $ 461 $ 629