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Inventories (Tables)
 9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
September 30,
2019
 
December 31,
2018
Raw materials
$
10,225

 
$
13,698

Work in process
3,740

 
2,489

Finished goods
11,352

 
6,755

 
$
25,317

 
$
22,942