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FOLLOW-ON EQUITY OFFERING (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2015
May. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
FOLLOW-ON EQUITY OFFERING [Abstract]          
America depositary shares (ADSs) issued, shares 1,540,000 2,000,000      
Follow-on equity offering, net of issuance costs, shares 38,500,000 50,000,000      
Issuance cost for ordinary shares $ 2,000,000 $ 3,400,000 $ 2,033,041 $ 3,375,553
Follow-on equity offering, net of issuance costs $ 28,000,000 $ 54,600,000 $ 27,996,959 $ 54,624,447