WARRANT DERIVATIVE LIABILITY - Assumptions used to calculate fair value of 2019 Warrants (Details) - 2019 Warrants	Jun. 30, 2020 Y item	May 31, 2019 Y item
Number of shares underlying the warrants
WARRANT DERIVATIVE LIABILITY
Measurement input used to calculate fair value of warrants	7,453,888	3,000,000
Current stock price
WARRANT DERIVATIVE LIABILITY
Measurement input used to calculate fair value of warrants	0.40	0.95
Exercise price
WARRANT DERIVATIVE LIABILITY
Measurement input used to calculate fair value of warrants	0.40	1.30
Expected volatility
WARRANT DERIVATIVE LIABILITY
Measurement input used to calculate fair value of warrants	1.10	1.33
Risk-free interest rate
WARRANT DERIVATIVE LIABILITY
Measurement input used to calculate fair value of warrants	0.0029	0.0193
Expected term (in years)
WARRANT DERIVATIVE LIABILITY
Measurement input used to calculate fair value of warrants | Y	3.92	5.00