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STOCKHOLDERS' EQUITY - Preferred Stock and Non-Cash Preferred Stock Dividend (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 09, 2018
Apr. 06, 2017
Feb. 27, 2017
Jan. 24, 2017
Jan. 18, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 16, 2017
Stockholders' equity                      
Shares issued 9,200,000                    
Share price (in dollars per share) $ 6.90                    
Offering costs including placement agent fees               $ 3,044   $ 11,919  
Par value of common stock (in dollars per share) $ 0.0001             $ 0.0001   $ 0.0001  
8% Convertible Preferred Stock                      
Stockholders' equity                      
Shares issued     5,518                
Dividend rate (as a percent)       8.00% 8.00%            
Preferred stock, par value (in dollars per share)       $ 0.0001              
Number of shares of common stock to be issued upon conversion       10,000              
Proceeds from issuance of convertible preferred stock per share     $ 72,500                
Gross proceeds from preferred stock offering     $ 400,100                
Share price (in dollars per share)     $ 7.25 $ 8.12              
Offering costs including placement agent fees     $ 11,900                
Par value of common stock (in dollars per share)                     $ 0.0001
Preferred dividend                 $ 0    
Conversion price (in dollars per share)       $ 0.87              
Beneficial conversion proceeds       $ 48,000              
Discount amortization period       65 months              
Amortization of beneficial conversion discount           $ 47,200 $ 800        
Common Stock                      
Stockholders' equity                      
Shares issued   55,200,000