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Inventories
 9 Months Ended
Sep. 30, 2022
Inventory Disclosure [Abstract]  
Inventories

4. Inventories

 

Inventories as of December 31, 2021 and September 30, 2022 consisted of the following:

 

   December 31,   September 30, 
   2021   2022 
Raw materials  $11,323,638   $7,359,155 
Work in progress   8,093,002    14,137,116 
Finished goods   10,716,700    31,213,597 
   $30,133,340   $52,709,868 

 

During the three months ended September 30, 2021 and 2022, write-downs of inventories to lower of cost or net realizable value of $324,984 and $278,603, respectively, were charged to cost of revenues.

 

During the nine months ended September 30, 2021 and 2022, write-downs of inventories to lower of cost or net realizable value of $663,041 and $1,177,891, respectively, were charged to cost of revenues.