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NOTE RECEIVABLES - Additional Information (Details) - USD ($)
3 Months Ended
Feb. 01, 2021
Dec. 09, 2020
Mar. 31, 2021
Mar. 31, 2020
Jan. 01, 2021
Dec. 31, 2020
Debt Instrument [Line Items]            
Principal amount     $ 9,000,000 $ 0    
Accounting Standards Update 2020-06 | Convertible Senior Notes | Convertible Debt            
Debt Instrument [Line Items]            
Debt instrument, interest rate, effective percentage         4.35%  
Equity Method Investee | Convertible Note Receivable            
Debt Instrument [Line Items]            
Principal amount   $ 6,650,000        
Related party transaction, rate   3.00%        
Related party transaction, effective interest rate   8.69%        
Embedded derivative, fair value of embedded derivative asset     1,000,000.0     $ 1,000,000.0
Accounts and financing receivable, allowance for credit loss     33,000      
Equity Method Investee | Notes Receivable            
Debt Instrument [Line Items]            
Principal amount $ 9,000,000.0          
Related party transaction, rate 10.00%          
Related party transaction, effective interest rate 10.99%          
Embedded derivative, fair value of embedded derivative asset     300,000      
Accounts and financing receivable, allowance for credit loss     $ 300,000