XML 22 R10.htm IDEA: XBRL DOCUMENT v3.19.2
Inventories
 6 Months Ended
Jun. 30, 2019
Inventories [Abstract]  
Inventories

4. Inventories

 

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

 

   December 31,   June 30, 
   2018   2019 
Raw materials  $1,675,383   $973,706 
Work in progress   2,737,415    1,931,391 
Finished goods   5,209,563    5,805,211 
   $9,622,361   $8,710,308 

 

During the three months ended June 30, 2018 and 2019, write-downs of obsolete inventories to lower of cost or market of $nil and $494,896, respectively, were charged to cost of revenues.

 

During the six months ended June 30, 2018 and 2019, write-downs of obsolete inventories to lower of cost or market of $1,199 and $557,668, respectively, were charged to cost of revenues.