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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
March 31,
2017
 
December 31,
2016
Raw materials
$
11,629

 
$
10,606

Work in process
2,170

 
2,185

Finished goods
7,956

 
7,954

 
$
21,755

 
$
20,745