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FINANCING ARRANGEMENTS - 3.25% Convertible Senior Notes due 2022 (Details)
1 Months Ended
Mar. 31, 2021
USD ($)
Apr. 30, 2016
USD ($)
$ / shares
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Stockholders' equity $ 65,620,000     $ 107,674,000 $ 191,507,000 $ 395,046,000
Additional Paid-In Capital            
Debt Instrument [Line Items]            
Stockholders' equity 2,261,095,000     2,348,114,000 2,323,217,000 [1] 2,310,393,000 [1]
Accumulated Deficit            
Debt Instrument [Line Items]            
Stockholders' equity (1,258,283,000)     (1,320,886,000) $ (1,246,477,000) (1,032,876,000)
Cumulative Effect, Period of Adoption, Adjustment            
Debt Instrument [Line Items]            
Stockholders' equity       (18,969,000)   (79,000)
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital            
Debt Instrument [Line Items]            
Stockholders' equity       (67,014,000)    
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit            
Debt Instrument [Line Items]            
Stockholders' equity       48,045,000   $ (79,000)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06            
Debt Instrument [Line Items]            
Non-current liabilities     $ 19,000,000.0      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional Paid-In Capital            
Debt Instrument [Line Items]            
Stockholders' equity     (67,000,000.0)      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Accumulated Deficit            
Debt Instrument [Line Items]            
Stockholders' equity     $ 48,000,000.0      
3.25% Convertible Senior Notes due 2022 | Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate   3.25%        
Principal amount 250,000,000 $ 250,000,000.0   250,000,000    
Net proceeds from issuance of debt   $ 243,200,000        
Debt conversion ratio   0.00925926        
Conversion price (in usd per share) | $ / shares   $ 108.00        
Debt related commitment fees and issuance costs   $ 6,800,000        
Debt issuance costs $ 0 $ 4,800,000   19,051,000    
Effective interest rate 3.76% 9.75%        
Equity component of convertible debt   $ 2,000,000.0        
Estimated fair value of convertible notes $ 262,200,000     $ 263,300,000    
Debt remaining term 1 year          
[1] All share information and balances have been retroactively adjusted to reflect a reverse stock split. See Note 7, Stockholders' Equity and Compensation Arrangements, for additional information.