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STOCKHOLDERS' EQUITY - Narrative (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
vote_per_share
shares
Dec. 31, 2017
shares
Class of Stock [Line Items]    
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock issued (in shares) 0 0
Preferred stock outstanding (in shares) 0 0
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Number of votes for each share held | vote_per_share 1  
Dividends in arrears or default | $ $ 0  
Controlled equity sales agreement with Cantor Fitzgerald And Company    
Class of Stock [Line Items]    
Common stock sold (in shares) 847,937  
Net proceeds | $ $ 6,400,000