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NOTES PAYABLE - 2019 12% Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2020
Sep. 30, 2019
Apr. 30, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
NOTES PAYABLE (Details) - 2019 12% Notes [Line Items]              
Gain (loss) on extinguishment of debt         $ (1,137,428) $ (1,638,009) $ (377,300)
12% Notes 2019 [Member]              
NOTES PAYABLE (Details) - 2019 12% Notes [Line Items]              
Debt instrument, interest rate, percentage 12.00% 12.00%         12.00%
Conversion price trigger (in dollars per share)   $ 1.30          
Minimum interest payment period   1 year 1 month 6 days          
Notes issued $ 1,506,000 $ 1,506,000          
Common stock subject to purchase (in shares)   1,506,000          
Proceeds from issuance of warrants   $ 400,000          
Gain on restructuring of debt   1,106,000          
Gain (loss) on extinguishment of debt   298,500          
Warrants recorded as a debt discount and additional paid-in capital   $ 93,500          
Amortization of debt discount           12,635 $ 23,432
15% Notes              
NOTES PAYABLE (Details) - 2019 12% Notes [Line Items]              
Debt instrument, interest rate, percentage 15.00%            
Amortization of debt discount       $ 0 $ 69,159 279,676 2,883
8.5% April 2018 [Member]              
NOTES PAYABLE (Details) - 2019 12% Notes [Line Items]              
Debt instrument, interest rate, percentage     8.50%        
Proceeds from issuance of warrants     $ 7,500,000        
Warrants recorded as a debt discount and additional paid-in capital     $ 5,366,000        
Amortization of debt discount           $ 0 $ 1,575,094