XML 44 R32.htm IDEA: XBRL DOCUMENT v3.19.1
Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventories [Abstract]  
Schedule of inventories
   December 31,   March 31, 
   2018   2019 
Raw materials  $1,675,383   $1,455,516 
Work in progress   2,737,415    1,373,975 
Finished goods   5,209,563    6,386,132 
   $9,622,361   $9,215,623