FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS AND ASSUMPTIONS (Details) - Level 3 - Recurring - Future tranche right	Jul. 31, 2020	May 07, 2020
Risk-free interest rate for preferred stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Rights outstanding, measurement input	0.0119	0.0131
Implied credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Rights outstanding, measurement input	0.0778	0.1078
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Rights outstanding, measurement input	0.3000	0.3000