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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
 
March 31, 2018
 
December 31, 2017
Raw material
$
297

 
$
298

Work in progress
3,742

 
7,825

Finished goods
1,001

 
832

Spare parts
232

 
137

Total inventory
5,272

 
9,092