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STOCKHOLDERS' EQUITY - Preferred Stock and Non-Cash Preferred Stock Dividend (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 5 Months Ended
Feb. 09, 2018
Apr. 06, 2017
Feb. 27, 2017
Jan. 24, 2017
Jan. 18, 2017
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
May 31, 2017
Sep. 30, 2018
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 $ 90 $ 11,829        
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