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Inventories (Tables)
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
September 30,
2017
 
December 31,
2016
Raw materials
$
12,159

 
$
10,606

Work in process
2,088

 
2,185

Finished goods
7,403

 
7,954

 
$
21,650

 
$
20,745