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INVENTORIES
 12 Months Ended
Dec. 31, 2016
INVENTORIES [Abstract]  
INVENTORIES
4. INVENTORIES
 
 
 
At December 31,
 
 
 
2015
 
2016
 
Raw materials
 
$
44,208,096
 
$
21,112,892
 
Work-in-process
 
 
27,302,298
 
 
27,941,926
 
Finished goods
 
 
121,660,725
 
 
94,921,237
 
Total inventories
 
$
193,171,119
 
$
143,976,055
 
 
For the year ended December 31, 2014, 2015 and 2016, inventory was written down by $808,031, $619,858 and $1,963,411, respectively, to reflect the lower of cost or market.