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FAIR VALUE MEASUREMENTS - Key Assumptions Used for Valuation (Details) - USD ($)
Mar. 31, 2021
Mar. 31, 2020
Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.650 0.750
Risk-free interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.001 0.003
Expected term (in years)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 1.2 2.3
Dividend yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0 0
Discount for lack of marketability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.068 0.400