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FAIR VALUE MEASUREMENTS - Key Assumptions Used for Valuation (Details)
Jun. 30, 2020
Volatility  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Measurement input 0.750
Risk-free interest rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Measurement input 0.160
Expected term (in years)  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Measurement input 2.0
Dividend yield  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Measurement input 0
Discount for lack of marketability  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Measurement input 0.193