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Revenue from Contracts with Customers (Tables)
3 Months Ended
Mar. 31, 2021
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, 2021 and 2020:

Three Months Ended
March 31,
20212020
Mobile connectivity product, transferred at point in time$6,088 $5,986 
Mobile connectivity product, transferred over time803 606 
Mobile connectivity service 23,616 22,304 
Inertial navigation product11,541 6,502 
Inertial navigation service244 1,170 
 Total net sales$42,292 $36,568