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Segment Reporting - Net Sales and Operating Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Net sales $ 42,292 $ 36,568
Operating (loss) income (3,607) (7,648)
Net interest and other (expense) income (574) 1,811
Loss before income tax (benefit) expense (4,181) (5,837)
Operating Segments    
Segment Reporting Information [Line Items]    
Operating (loss) income 1,693 (3,120)
Operating Segments | Mobile connectivity    
Segment Reporting Information [Line Items]    
Net sales 30,507 28,896
Operating (loss) income (397) (2,299)
Operating Segments | Inertial navigation    
Segment Reporting Information [Line Items]    
Net sales 11,785 7,672
Operating (loss) income 2,090 (821)
Unallocated    
Segment Reporting Information [Line Items]    
Operating (loss) income $ (5,300) $ (4,528)