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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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- Definition

Number of depositary shares issued during the period.

+ References

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X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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Number of shares of stock issued attributable to transactions classified as other.

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Value of shares of stock issued attributable to transactions classified as other.

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