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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
March 31,
2015
 
December 31,
2014
Raw materials
$
9,605

 
$
8,619

Work in process
3,052

 
2,896

Finished goods
5,991

 
5,909

 
$
18,648

 
$
17,424