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Revenue from Contracts with Customers (ASC 606) (Tables)
6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Disaggregation of Revenue

The following table summarizes net sales from contracts with customers for the three and six months ended June 30, 2019:

 
 
Three Months Ended
 
Six Months Ended
 
 
June 30
 
June 30
 
 
2019
 
2018
 
2019
 
2018
Mobile connectivity product, transferred at point in time
 
$
6,697

 
$
6,731

 
$
12,374

 
$
13,401

Mobile connectivity product, transferred over time
 
1,371

 
1,372

 
2,756

 
2,622

Mobile connectivity service
 
22,906

 
20,901

 
44,417

 
41,034

Inertial navigation product
 
6,626

 
8,059

 
12,438

 
14,131

Inertial navigation service
 
1,635

 
1,569

 
3,285

 
2,849

  Total net sales
 
$
39,235

 
$
38,632

 
$
75,270

 
$
74,037