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CONVERTIBLE NOTES - Bridge Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 26, 2020
Mar. 25, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 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         $ 2,176,000      
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)     3,480,148   3,908,145      
Conversion of convertible debt, plus interest, into common stock     $ 1,800,000   $ 2,200,000      
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