XML 56 R39.htm IDEA: XBRL DOCUMENT v3.21.1
Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventories [Abstract]  
Schedule of inventories

   December 31,   December 31, 
   2019   2020 
Raw materials  $482,836   $757,857 
Work in progress   1,254,490    2,338,342 
Finished goods   6,929,388    2,156,646 
   $8,666,714   $5,252,845