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Revenue from Contracts with Customers (ASC 606) (Tables)
9 Months Ended
Sep. 30, 2020
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 and nine months ended September 30, 2020 and 2019:

Three Months EndedNine Months Ended
September 30,September 30,
2020201920202019
Mobile connectivity product, transferred at point in time$6,671 $7,540 $18,737 $22,536 
Mobile connectivity product, transferred over time549 537 1,778 1,507 
Mobile connectivity service 24,163 23,565 68,950 67,982 
Inertial navigation product9,430 6,731 23,178 19,169 
Inertial navigation service299 938 1,963 4,223 
 Total net sales$41,112 $39,311 $114,606 $115,417