Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENT (Details)

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SUBSEQUENT EVENT (Details) - Subsequent Event - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Apr. 16, 2018
Apr. 10, 2018
Apr. 30, 2018
Subsequent Event [Line Items]      
Sale of stock, number of shares issued in transaction 3,592,684 58,666,667 62,300,000.0
Sale of stock, price per share   $ 1.50  
Sale of stock, additional shares authorized for purchase, option term   30 days  
Sale of stock, number of additional shares authorized for purchase   8,800,000 34,700,000
Gross proceeds from issuance of common stock $ 93.4   $ 93.4
Net proceeds from issuance of common stock $ 89.5