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Revenue from Contracts with Customers (ASC 606) (Tables)
3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Net Sales from Contracts with Customers
The following table summarizes net sales from contracts with customers for the three months ended March 31, 2022 and 2021:

Three Months Ended
March 31,
20222021
Mobile connectivity product, transferred at point in time$6,107 $6,088 
Mobile connectivity product, transferred over time456 803 
Mobile connectivity service 26,588 23,616 
Inertial navigation product7,807 11,541 
Inertial navigation service136 244 
 Total net sales$41,094 $42,292