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FOLLOW-ON EQUITY OFFERINGS (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
America depositary shares (ADSs) issued, shares | 2,064,379 |  |  |
Follow-on equity offering, net of issuance costs, shares | 51,609,475 |  |  |
Issuance cost for ordinary shares | $ 6,900,000 | $ 6,919,202 |  |
Follow-on equity offering, net of issuance costs | $ 106,600,000 | $ 106,621,643 |  |

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