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

 
June 30,
2017
 
December 31,
2016
Raw materials
$
11,946

 
$
10,606

Work in process
2,623

 
2,185

Finished goods
8,843

 
7,954

 
$
23,412

 
$
20,745