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CONVERTIBLE NOTES - Bridge Notes (Details) - USD ($)
3 Months Ended
Mar. 26, 2020
Mar. 25, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]            
Loss on extinguishment of convertible notes       $ (1,225,000)    
Conversion of convertible debt, plus interest, into common stock       353,000    
Convertible notes     $ 0   $ 0  
April 2019 Bridge Notes And May 2019 Bridge Notes            
Debt Instrument [Line Items]            
Guaranteed interest period 18 months 12 months        
Convertible Debt [Member] | Convertible Bridge Loan            
Debt Instrument [Line Items]            
Debt discount           $ 1,796,000
Debt premium on debt       $ 679,000    
Number of shares converted from debt instrument (in shares)       427,997    
Conversion of convertible debt, plus interest, into common stock       $ 300,000    
Amendment Agreement | Convertible Debt [Member] | April 2019 Bridge Notes And May 2019 Bridge Notes            
Debt Instrument [Line Items]            
Loss on extinguishment of convertible notes     1,200,000      
Floor price $ 0.40 $ 2.25        
Debt premium on debt     $ 800,000