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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
USD ($)
segment
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]                  
Number of operating segments | segment 2                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity $ 97,114 $ 122,085 $ 184,842 $ 210,296 $ 149,497 $ 55,836 $ 65,620   $ 107,674
Convertible senior notes, net 224,540     223,403          
Additional Paid-In Capital                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity 2,317,003 2,308,176 2,300,558 2,294,215 2,269,184 2,260,308 2,263,790   2,348,114
Accumulated Deficit                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity $ (1,339,170) $ (1,282,947) $ (1,191,720) (1,156,868) $ (1,186,253) $ (1,264,360) $ (1,260,978)   (1,320,886)
Cumulative Effect, Period of Adoption, Adjustment                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity                 (18,969)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Convertible senior notes, net               $ 19,000  
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity                 (64,319)
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital | Accounting Standards Update 2020-06                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity               (67,000)  
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity                 $ 45,350
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit | Accounting Standards Update 2020-06                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Stockholders' equity       $ 2,700       $ 48,000  
3.25% Convertible Senior Notes due 2022 | Senior Notes                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Effective interest rate 3.76%