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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)

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