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2. Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
2. Inventories

Inventories consist of the following:

 

   

March 31,

2018

   

December 31,

2017

 
Raw materials   $ 3,971     $ 2,829  
Work-in-progress     1,949       1,605  
Finished goods     483       1,303  
Total inventories   $ 6,403     $ 5,737