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Revenue from Contracts with Customers (ASC 606) (Tables)
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table summarizes net sales from contracts with customers for the years ended December 31, 2020 and 2019:

Year Ended
December 31,
20202019
Mobile connectivity product, transferred at point in time$25,140 $26,419 
Mobile connectivity product, transferred over time (1)
2,723 5,204 
Mobile connectivity service 91,590 90,392 
Inertial navigation product36,756 30,302 
Inertial navigation service2,524 5,576 
   Total net sales$158,733 $157,893 

(1) Reflects the correction discussed above.