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DEBT - Convertible Senior Notes due in 2025 Narrative (Details)
 1 Months Ended 3 Months Ended
Mar. 01, 2021
USD ($)
Mar. 09, 2020
USD ($)
trading_day
$ / shares
shares
Apr. 27, 2021
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
May 20, 2020
USD ($)
$ / shares
shares
May 19, 2020
shares
Debt Instrument [Line Items]                
Debt, current       $ 84,356,000   $ 325,967,000    
Common stock, par value (in usd per share) | $ / shares       $ 0.00001   $ 0.00001 $ 0.00001  
Common stock, shares authorized (in shares) | shares       200,000,000   200,000,000 200,000,000 150,000,000
Deferred tax assets, net       $ 132,231,000   $ 92,904,000    
Partial repurchase of convertible notes       289,233,000 $ 0      
Loss on partial repurchase of convertible notes       56,369,000 0      
Payment for bonds hedge       286,235,000 89,056,000      
Proceeds from sale of warrants       220,800,000 $ 71,552,000      
Warrants obligations measured at fair value             $ 96,400,000  
Convertible Notes                
Debt Instrument [Line Items]                
Convertible notes embedded derivative             117,100,000  
Convertible Notes | Convertible Senior Notes Due 2025                
Debt Instrument [Line Items]                
Debt instrument face amount   $ 320,000,000.0            
Interest rate   0.25%            
Debt conversion price (in USD per share) | $ / shares   $ 81.54            
Proceeds from convertible debt   $ 313,000,000.0            
Conversion ratio   0.0122637            
Debt, current       102,300,000        
Convertible notes embedded derivative   $ 68,700,000         $ 116,300,000  
Embedded derivative, host contract   251,300,000            
Deferred tax assets, net       $ 200,000        
Debt issuance costs   $ 7,600,000            
Partial repurchase of convertible notes $ 217,700,000              
Exercise of warrants (shares) | shares       1,670,000        
Equity component of convertible notes due 2025, net 302,700,000              
Convertible note, liability component $ 184,500,000              
Residual       $ 4,300,000        
Induced conversion of convertible debt expense       $ 37,500,000        
Remaining expected life       4 years 1 month 6 days        
Write off of debt discount       $ 38,500,000        
Write off of deferred debt issuance cost       4,100,000        
Loss on partial repurchase of convertible notes       $ 9,400,000        
Effective percentage rate       5.18%        
Unamortized discount       $ 17,700,000   $ 58,600,000    
Remaining discount amortization period       3 years 10 months 24 days        
Conversion shares (in shares) | shares   3,900,000            
Payment for bonds hedge   $ 89,100,000            
Warrants issued, strike price (in USD per share) | $ / shares   $ 106.94            
Proceeds from sale of warrants   $ 71,600,000            
Convertible notes hedge settlements, shares received (in shares) | shares       1,900,000        
Warrants unwound, shares issued (in shares) | shares       1,800,000        
Convertible notes hedge transaction, options outstanding (in shares) | shares       1,300,000        
Warrants outstanding (in shares) | shares       1,300,000        
Convertible Notes | Convertible Senior Notes Due 2025 | Subsequent Event                
Debt Instrument [Line Items]                
Amount to be converted     $ 100,000          
Convertible Notes | Convertible Senior Notes Due 2025 | Discount rate                
Debt Instrument [Line Items]                
Measurement input       0.0435        
Period One | Convertible Notes | Convertible Senior Notes Due 2025                
Debt Instrument [Line Items]                
Number of threshold trading days | trading_day   20            
Number of consecutive trading days | trading_day   30            
Threshold percentage   130.00%            
Stock trigger price (in USD per share) | $ / shares       $ 106.00        
Period Two | Convertible Notes | Convertible Senior Notes Due 2025                
Debt Instrument [Line Items]                
Number of consecutive trading days | trading_day   5            
Threshold percentage   100.00%            
Measurement period percentage of stock price trigger   98.00%