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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories

   March 31,
2019
   December 31, 2018 
Raw materials  $1,030,504   $1,207,334 
Work-in-process   774,260    872,376 
Finished goods   5,676,673    5,547,301 
    7,481,437    7,627,011 
Less: inventory reserve   (4,929,768)   (1,212,706)
   $2,551,669   $6,414,305