XML 53 R10.htm IDEA: XBRL DOCUMENT v3.19.3
Inventories
 9 Months Ended
Sep. 30, 2019
Inventories [Abstract]  
Inventories

4. Inventories

 

Inventories as of December 31, 2018 and September 30, 2019 consisted of the following:

 

   December 31,   September 30, 
   2018   2019 
Raw materials  $1,675,383   $1,422,821 
Work in progress   2,737,415    1,089,938 
Finished goods   5,209,563    8,366,042 
   $9,622,361   $10,878,801 

 

During the three months ended September 30, 2018 and 2019, write-downs of inventories to lower of cost or net realizable value of $729,247 and nil, respectively, were charged to cost of revenues.

 

During the nine months ended September 30, 2018 and 2019, write-downs of inventories to lower of cost or net realizable value of $730,446 and $557,668, respectively, were charged to cost of revenues.