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PREPAID EXPENSE AND OTHER CURRENT ASSETS (Tables)
12 Months Ended
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expense and Other Current Assets
Prepaid expense and other current assets consist of the following:
 
 
 
December 31,
 
 
 
2017
 
 
2018
 
Spare parts
 
$
5,598,073
 
 
$
5,011,781
 
Prepaid value added tax (“VAT”)
 
 
-
 
 
 
4,768,552
 
Prepaid insurance fee
 
 
285,650
 
 
 
153,751
 
Others
 
 
805,900
 
 
 
401,417
 
Total
 
$
6,689,623
 
 
$
10,335,501