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PREFERRED STOCK AND SHAREHOLDERS' EQUITY - Warrants Issued (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2020
Dec. 31, 2020
Mar. 31, 2021
Measurement Input, Expected Term [Member]      
Mezzanine Equity [Line Items]      
Fair value of warrants issued   $ 7.5  
Measurement Input, Expected Dividend Rate [Member]      
Mezzanine Equity [Line Items]      
Fair value of warrants issued   0.00  
Measurement Input, Price Volatility [Member]      
Mezzanine Equity [Line Items]      
Fair value of warrants issued   50  
Measurement Input, Risk Free Interest Rate [Member]      
Mezzanine Equity [Line Items]      
Fair value of warrants issued   $ 0.47  
Redeemable preferred stock      
Mezzanine Equity [Line Items]      
Shares issued 3,500    
Issue price per share $ 10,000 $ 10,000  
Dividend variable rate 10.75%    
Maximum dividend rate 15.00%    
Dividend variable rate if company elects to pay dividend in cash 8.75%    
Maximum dividend rate if company elects to pay dividend in cash 12.75%    
Fair value of redeemable preferred stock   $ 11,509,000  
Issuance costs related to redeemable preferred stock   774,000  
Net carrying value   $ 10,735,000 $ 10,735,000
Number of warrants issued   2  
Fair value of warrants issued   $ 1,580,000  
Issuance costs related to warrants   23,491,000  
Carrying value of warrants   $ 1,580,000  
Input rate   21,911,000  
Gross proceeds   $ 35,000,000  
Warrant One Member | Redeemable preferred stock      
Mezzanine Equity [Line Items]      
Warrants to purchase shares of common stock   1,477,094  
exercise price of warrants   $ 10.21  
Warrant Two Member | Redeemable preferred stock      
Mezzanine Equity [Line Items]      
Warrants to purchase shares of common stock   2,954,188  
exercise price of warrants   $ 0.01