STOCKHOLDERS' EQUITY - Schedule of Variables used in Black-Scholes Model (Details)	Jun. 30, 2020	Dec. 31, 2019	Jan. 20, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Expected life (years)	4 years 6 months 21 days	5 years 21 days	5 years
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	0.24%	1.69%
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	124.10%	103.07%
Expected dividend
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	0.00%	0.00%