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STOCKHOLDERS' EQUITY-Common stock and warrants (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 09, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 09, 2016
Stockholders' equity
Shares issued	9,200,000
Authorized shares of common stock, after amendment of certificate of incorporation		1,000,000,000	1,000,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Number of warrants issued				4,700,000
Share price (in dollars per share)	$ 6.90
Net proceeds issuance of common stock	$ 60.4
Warrants Issued to Former Holders of Unsecured and Convertible Notes
Stockholders' equity
Number of warrants issued				4,700,000
Exercise price (in dollars per share)				$ 14.04

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