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2. Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories

Inventories consist of the following:

 

   

December 31,

2017

   

December 31,

2016

 
Raw materials   $ 2,829     $ 1,044  
Work-in-progress     1,605       1,360  
Finished goods     1,303       837  
Total inventories   $ 5,737     $ 3,241