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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventories  
Summary of Inventories

 

 

 

 

 

 

 

 

 

December 31, 

 

    

2017

    

2016

Component parts

 

$

4,691

 

$

8,360

Work-in-process and finished goods

 

 

7,349

 

 

9,060

Total

 

$

12,040

 

$

17,420