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Segment Reporting - Net Sales and Operating Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net sales $ 43,363 $ 36,926 $ 85,655 $ 73,494
Loss from operations (5,802) (3,436) (9,409) (11,084)
Net interest and other (expense) income 207 53 (367) 1,864
Loss before income tax expense (benefit) (5,595) (3,383) (9,776) (9,220)
Operating Segments        
Segment Reporting Information [Line Items]        
Loss from operations 1,225 738 2,918 (2,382)
Operating Segments | Mobile connectivity        
Segment Reporting Information [Line Items]        
Net sales 33,755 29,186 64,262 58,082
Loss from operations 580 584 183 (1,715)
Operating Segments | Inertial navigation        
Segment Reporting Information [Line Items]        
Net sales 9,608 7,740 21,393 15,412
Loss from operations 645 154 2,735 (667)
Unallocated        
Segment Reporting Information [Line Items]        
Loss from operations $ (7,027) $ (4,174) $ (12,327) $ (8,702)