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DEBT - Convertible Notes Hedge and Warrant Liability (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Debt Instrument [Line Items]      
Convertible notes hedge, beginning balance   $ 0  
Convertible notes hedge, change in the fair value   15,344 $ 0
Convertible notes hedge, ending balance $ 47,885 47,885  
Warrants liability, beginning balance   0  
Warrants liability, ending balance 38,637 38,637  
Convertible Notes | Convertible Senior Notes Due 2025      
Debt Instrument [Line Items]      
Convertible notes hedge, beginning balance 89,056    
Convertible notes hedge, change in the fair value (41,171)    
Convertible notes hedge, ending balance 47,885 47,885  
Warrants liability, beginning balance 71,552    
Warrants liability, change in fair value (32,915)    
Warrants liability, ending balance $ 38,637 $ 38,637