STOCKHOLDERS' EQUITY - Schedule of Variables used in Black-Scholes Model (Details)	Jun. 30, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Expected life (years)	3 years 6 months 21 days	4 years 21 days
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	0.56%	0.27%
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	130.87%	130.56%
Expected dividend
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	0.00%	0.00%