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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
June 30,
2015
 
December 31,
2014
Raw materials
$
11,019

 
$
8,619

Work in process
3,287

 
2,896

Finished goods
5,271

 
5,909

 
$
19,577

 
$
17,424