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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
September 30,
2018
 
December 31,
2017
Raw materials
$
14,667

 
$
13,347

Work in process
3,172

 
2,137

Finished goods
6,837

 
7,248

 
$
24,676

 
$
22,732