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STOCKHOLDERS EQUITY - Private Placement of Automatically Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 06, 2017
Feb. 27, 2017
Jan. 24, 2017
Sep. 09, 2016
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Mar. 16, 2017
Dec. 31, 2016
Stockholders' equity                  
Par value of common stock (in dollars per share)         $ 0.0001   $ 0.0001   $ 0.0001
Gross proceeds from preferred stock offering             $ 400,055    
Offering costs including placement agent fees             11,919    
8% Convertible Preferred Stock                  
Stockholders' equity                  
Shares issued   5,518              
Dividend rate (as a percent)     8.00%            
Preferred stock, par value (in dollars per share)     $ 0.0001            
Proceeds from issuance of convertible preferred stock per share   $ 72,500              
Number of shares of common stock to be issued upon conversion     10,000            
Par value of common stock (in dollars per share)               $ 0.0001  
Gross proceeds from preferred stock offering   $ 400,100              
Conversion price (in dollars per share)     $ 0.87            
Share price (in dollars per share)   $ 7.25 $ 8.12            
Preferred dividend             $ 0    
Offering costs including placement agent fees   $ 11,900              
Beneficial conversion proceeds     $ 48,000            
Discount amortization period     65 months            
Amortization of beneficial conversion discount         $ 47,200 $ 800      
Preferred Stock                  
Stockholders' equity                  
Preferred stock, par value (in dollars per share)       $ 0.0001          
Common Stock                  
Stockholders' equity                  
Shares issued 55,200,000     90,000,000          
Par value of common stock (in dollars per share)       $ 0.0001