NOTES PAYABLE - Assumptions Used to Calculate Fair Value of Warrants (Details) - 10% Warrants	Apr. 20, 2021 USD ($) $ / shares Y	Feb. 08, 2021 Y $ / shares	Dec. 23, 2020 $ / shares
Current stock price
NOTES PAYABLE
Measurement input used to calculate fair value of warrants | $ / shares	0.83	1.12	0.53
Exercise price
NOTES PAYABLE
Measurement input used to calculate fair value of warrants	0.56	0.56	0.56
Risk-free interest rate
NOTES PAYABLE
Measurement input used to calculate fair value of warrants	0.81	0.48	0.38
Expected term (in years)
NOTES PAYABLE
Measurement input used to calculate fair value of warrants | Y	5.0	5.0
Expected volatility
NOTES PAYABLE
Measurement input used to calculate fair value of warrants	115	118	115