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DEBT - Convertible Notes Hedge and Warrant Liability (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
May 20, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]            
Convertible notes hedge, change in the fair value     $ 0 $ 0 $ (44,348) $ 0
Warrants liability, ending balance   $ 96,400        
Convertible Notes | Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Convertible notes hedge, beginning balance $ 89,056 47,885        
Convertible notes hedge, change in the fair value (41,171) 69,223        
Convertible notes hedge, ending balance 47,885 117,108        
Warrants liability, beginning balance 71,552 38,637        
Warrants liability, change in fair value (32,915) 57,715        
Warrants liability, ending balance $ 38,637 $ 96,352