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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of inventories
   December 31,   September 30, 
   2020   2021 
Raw materials  $757,857   $2,820,938 
Work in progress   2,338,342    3,597,165 
Finished goods   2,156,646    2,831,352 
   $5,252,845   $9,249,455