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GENERAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 19, 2018
Jan. 04, 2017
Nov. 15, 2016
Jun. 30, 2018
Jun. 30, 2017
Common Stock          
Summary of Significant Accounting Policies          
Issuance of stock (in shares) 7,015,000     7,015,000  
Share price (in dollars per share) $ 16.50        
Net proceeds proceeds from issuance of common stock $ 109,675        
Series A Preferred Stock | Preferred Stock          
Summary of Significant Accounting Policies          
Common stock authorized for conversion of preferred stock   27,061,856      
Line of Credit Facility          
Preferred stock, par value (in dollars per share)   $ 0.01      
Preferred stock outstanding (in shares)   27,061,856      
Preferred stock converted into common stock   27,061,856     27,061,856
Private placement | Series A Preferred Stock | Preferred Stock          
Summary of Significant Accounting Policies          
Issuance of stock (in shares)     27,061,856    
Issuance of stock excluding services (in shares)     25,773,196    
Share price (in dollars per share)     $ 4.85    
Additional shares issued as commitment fee (in shares)     1,288,660    
Net proceeds     $ 120,789