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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Quantitative Information about Level 3 Unobservable Inputs (Details) - Level 3
Mar. 31, 2020
USD ($)
Monte Carlo simulation  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value $ 500,000
Monte Carlo simulation | Discount rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 0.045
Monte Carlo simulation | Revenue Volatility  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 0.306
Monte Carlo simulation | Risk free rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 0.012
Probability Analysis  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value $ 11,323,000
Probability Analysis | Discount rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 0.050
Probability Analysis | Payment amounts | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input $ 3,000,000
Probability Analysis | Payment amounts | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 5,400,000
Probability Analysis | Payment amounts | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input $ 7,000,000
Probability Analysis | Probabilities | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 0.40
Probability Analysis | Probabilities | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 0.53
Probability Analysis | Probabilities | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable Input 0.60