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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Jan. 01, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Investment, long-term loan receivable     $ 3,500
Investment, long-term receivable, credit loss expense $ 1,900    
Convertible debt      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reacquisition of equity component   $ 19,532  
Convertible debt | Additional Paid-In Capital      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reacquisition of equity component   $ 19,532