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Segment Reporting - Net Sales and Operating Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Net sales $ 41,094 $ 42,292
Loss from operations (4,708) (3,607)
Net interest and other income (expense), net 345 (574)
Loss before income tax expense (benefit) (4,363) (4,181)
Operating Segments    
Segment Reporting Information [Line Items]    
Loss from operations 845 1,693
Operating Segments | Mobile connectivity    
Segment Reporting Information [Line Items]    
Net sales 33,151 30,507
Loss from operations 1,305 (397)
Operating Segments | Inertial navigation    
Segment Reporting Information [Line Items]    
Net sales 7,943 11,785
Loss from operations (460) 2,090
Unallocated    
Segment Reporting Information [Line Items]    
Loss from operations $ (5,553) $ (5,300)