Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Series A-1 Preferred Stock (Details)

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STOCKHOLDERS' EQUITY - Series A-1 Preferred Stock (Details) - Series A-1 preferred shares - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Dec. 31, 2017
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