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Inventories
 6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
4. Inventories

 

Inventories as of December 31, 2020 and June 30, 2021 consisted of the following:

 

   December 31,   June 30, 
   2020   2021 
Raw materials  $757,857   $3,395,452 
Work in progress   2,338,342    2,735,322 
Finished goods   2,156,646    3,566,676 
   $5,252,845   $9,697,450 

 

During the three months ended June 30, 2020 and 2021, write-downs of obsolete inventories to lower of cost or net realizable value of $47,977 and $104,752, respectively, were charged to cost of revenues.

 

During the six months ended June 30, 2020 and 2021, write-downs of obsolete inventories to lower of cost or net realizable value of $457,039 and $338,057, respectively, were charged to cost of revenues.