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FOLLOW-ON EQUITY OFFERINGS (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
America depositary shares (ADSs) issued, shares | 1,540,000 |  |  |
Follow-on equity offering, net of issuance costs, shares | 38,500,000 |  |  |
Issuance cost for ordinary shares | $ 2,000,000 |  |  | $ 2,033,041
Follow-on equity offering, net of issuance costs | $ 28,000,000 |  |  | $ 27,996,959

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