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

5. Inventories

 

Inventories consist of the following at December 31:

 

    2017     2016  
Raw materials   $ 3,755,477     $ 439,739  
Finished goods     295,805       340,298  
Total inventories   $ 4,051,282     $ 780,037