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Segment Reporting - Net Sales and Operating Income (Loss) (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]        
Net sales $ 41,837 $ 43,363 $ 82,931 $ 85,655
Loss from operations (2,332) (5,802) (7,040) (9,409)
Net interest and other income (expense), net 1,123 207 1,468 (367)
Loss before income tax expense (benefit) (1,209) (5,595) (5,572) (9,776)
Operating Segments        
Segment Reporting Information [Line Items]        
Loss from operations 3,236 1,225 4,081 2,918
Operating Segments | Mobile connectivity        
Segment Reporting Information [Line Items]        
Net sales 34,553 33,755 67,704 64,262
Loss from operations 4,525 580 5,830 183
Operating Segments | Inertial navigation        
Segment Reporting Information [Line Items]        
Net sales 7,284 9,608 15,227 21,393
Loss from operations (1,289) 645 (1,749) 2,735
Unallocated        
Segment Reporting Information [Line Items]        
Loss from operations $ (5,568) $ (7,027) $ (11,121) $ (12,327)