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Segment Reporting - Net Sales and Operating Income (Loss) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Net sales   $ 171,767,000 $ 158,733,000
Operating income (loss)   (17,946,000) (22,937,000)
Net interest and other income   8,075,000 1,171,000
Loss before income tax (benefit) expense   (9,871,000) (21,766,000)
Impairment charge to goodwill and intangibles $ 10,490,000 0 10,490,000
Operating Segments      
Segment Reporting Information [Line Items]      
Operating income (loss)   4,398,000 (5,272,000)
Operating Segments | Mobile Connectivity      
Segment Reporting Information [Line Items]      
Net sales   133,911,000 119,453,000
Operating income (loss)   2,749,000 (10,071,000)
Operating Segments | Intertial Navigation      
Segment Reporting Information [Line Items]      
Net sales   37,856,000 39,280,000
Operating income (loss)   1,649,000 4,799,000
Unallocated, net      
Segment Reporting Information [Line Items]      
Operating income (loss)   $ (22,344,000) $ (17,665,000)