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STOCKHOLDERS' EQUITY-Common stock and warrants (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Feb. 09, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 09, 2016
Stockholders' equity
Shares issued	9.2
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Share price (in dollars per share)	$ 6.90
Net proceeds issuance of common stock	$ 60.4
Number of warrants issued				4.7
Warrants Issued to Former Holders of Unsecured and Convertible Notes
Stockholders' equity
Number of warrants issued				4.7
Exercise price (in dollars per share)				$ 14.04

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Exercise price per share or per unit of warrants or rights outstanding.

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