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Revenue from Contracts with Customers (ASC 606) - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]    
Total net sales $ 171,767 $ 158,733
Product    
Revenue from External Customer [Line Items]    
Total net sales 66,870 64,619
Service    
Revenue from External Customer [Line Items]    
Total net sales 104,897 94,114
Mobile Connectivity | Service    
Revenue from External Customer [Line Items]    
Total net sales 103,899 91,590
Intertial Navigation | Product    
Revenue from External Customer [Line Items]    
Total net sales 36,858 36,756
Intertial Navigation | Service    
Revenue from External Customer [Line Items]    
Total net sales 998 2,524
Transferred at point in time | Mobile Connectivity | Product    
Revenue from External Customer [Line Items]    
Total net sales 27,490 25,140
Transferred over time | Mobile Connectivity | Product    
Revenue from External Customer [Line Items]    
Total net sales $ 2,522 $ 2,723