STOCKHOLDERS' EQUITY - Series A-1 Preferred Stock (Details) - Series A-1 preferred shares - USD ($) $ in Millions		3 Months Ended
	Jun. 19, 2017	Mar. 31, 2018
Class of Stock [Line Items]
Value of shares		$ 19.9
Number of shares retired (in shares)		153,000
Reduction in the value of the preferred stock		$ 15.3
Reduction in the accretive value of the preferred stock		4.6
Issuance costs	$ 1.0
Deemed dividend		$ 4.6