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PREFERRED STOCK AND STOCKHOLDERS' DEFICIT - 2017 Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 29, 2017
Mar. 31, 2019
Mar. 31, 2018
Class of Warrant or Right [Line Items]      
Decrease in fair value of warrants   $ 9,999 $ 3,439
2017 Warrants      
Class of Warrant or Right [Line Items]      
Decrease in fair value of warrants   10,000 $ 3,400
Common Stock | 2017 Warrants      
Class of Warrant or Right [Line Items]      
Warrant exercise threshold 4.99%    
Warrant holder outstanding common stock ownership limitation 19.99%    
Term of warrants 10 years    
Exercise price of warrants (in dollars per share) $ 2.00    
Warrants, fair value   $ 15,300