FAIR VALUE MEASUREMENTS OF CERTAIN LIABILITIES - Quantitative Inputs (Details) - Warrant liabilities - Fair Value, Inputs, Level 3	Sep. 30, 2020	Dec. 31, 2019
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liability, measurement input	0.8500	0.7500
Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liability, measurement input	0.0016	0.0165
Expected remaining term (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liability, measurement input	2.98	3.72