DEBT - Additional Note (Details) - USD ($)
3 Months Ended
Jan. 10, 2020
Mar. 08, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Instrument [Line Items]          
Amortization of debt discount     $ 43,983 $ 481,024  
Repayments of debt     58,199 1,469,804  
Unsecured Convertible Promissory Note          
Debt Instrument [Line Items]          
Principal amount   $ 5,500,000     $ 8,400,000
Conversion price (in dollars per share)   $ 3.25      
Proceeds from notes payable   $ 5,000,000.0      
Unamortized discount   500,000      
Debt discount and derivative liability at the issuance date   $ 1,300,000      
Amortization of debt discount     400,000    
Debt interest rate   10.00%      
Repayments of debt       1,500,000  
Additional Note | Unsecured Convertible Promissory Note          
Debt Instrument [Line Items]          
Principal amount $ 2,750,000        
Conversion price (in dollars per share) $ 3.25        
Proceeds from notes payable $ 2,500,000        
Unamortized discount 250,000        
Debt discount and derivative liability at the issuance date $ 400,000        
Amortization of debt discount     44,000 108,000  
Debt interest rate 10.00%        
Repayments of debt     $ 59,000 $ 0