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STOCKHOLDERS' EQUITY - EQUITY PLANS - SCHEDULE OF AGGREGATE OPTION AND AWARD ACTIVITY (Parenthetical) (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Feb. 29, 2020
Jan. 31, 2019
STOCKHOLDERS' EQUITY        
Options granted (in shares) 11,735,600      
Common stock, shares reserved for future issuance 45,395,620      
2018 Inducement Award Plan        
STOCKHOLDERS' EQUITY        
Common stock, shares reserved for future issuance   3,000,000   8,000,000
Subsequent Event | 2018 Inducement Award Plan        
STOCKHOLDERS' EQUITY        
Common stock, shares reserved for future issuance     9,300,000  
Performance-Based Stock Options        
STOCKHOLDERS' EQUITY        
Options granted (in shares) 1,000,000 4,500,000