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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Significant Unobservable Inputs for Contingent Consideration (Details) - (Level 3) $ in Thousands | Jun. 30, 2019 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair value of contingent consideration | $ 9,555
Discount rate |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Contingent consideration inputs under Monte Carlo simulation | 0.110
Revenue volatility |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Contingent consideration inputs under Monte Carlo simulation | 0.130
Risk free rate |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Contingent consideration inputs under Monte Carlo simulation | 0.020

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