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PREPAID EXPENSE AND OTHER CURRENT ASSETS
 12 Months Ended
Dec. 31, 2016
PREPAID EXPENSE AND OTHER CURRENT ASSETS [Abstract]  
PREPAID EXPENSE AND OTHER CURRENT ASSETS
6. PREPAID EXPENSE AND OTHER CURRENT ASSETS
 
Prepaid expense and other current assets consist of the following:
 
 
 
December 31,
 
 
 
2015
 
2016
 
Spare parts
 
$
6,052,315
 
$
5,732,914
 
Prepaid Value added tax (“VAT”)
 
 
5,552,772
 
 
1,808,141
 
Prepaid insurance fee
 
 
347,631
 
 
259,650
 
Others
 
 
282,423
 
 
226,962
 
Total
 
$
12,235,141
 
$
8,027,667