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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
USD ($)
segment
Mar. 31, 2022
USD ($)
Dec. 31, 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 $ 122,085 $ 184,842 $ 210,296 $ 55,836 $ 65,620   $ 107,674
Convertible senior notes, net 224,160   223,403        
Additional Paid-In Capital              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity 2,308,176 2,300,558 2,294,215 2,260,308 2,263,790   2,348,114
Accumulated Deficit              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity $ (1,282,947) $ (1,191,720) (1,156,868) $ (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%