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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
June 30,
2016
 
December 31,
2015
Raw materials
$
13,118

 
$
12,833

Work in process
2,085

 
2,778

Finished goods
6,497

 
5,978

 
$
21,700

 
$
21,589