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Inventory (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory
   As of
March 31,
2019
   As of
December 31,
2018
 
Raw materials  $470,497   $338,991 
Work-in-process   1,153,152    1,337,035 
Finished goods   412,144    655,645 
Total  $2,035,793   $2,331,671