FAIR VALUE MEASUREMENTS - Summary of Assumptions Used in Calculating Fair Value (Details) - Discounted Cash Flow Technique $ in Millions	Mar. 31, 2020 USD ($) year	Dec. 31, 2019 USD ($) year
Discount rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability, measurement input	0.0498	0.0370
Discount rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability, measurement input	0.0638	0.0746
Discount rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability, measurement input	0.0494	0.0499
Payment cap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment cap | $	$ 26.8	$ 28.8
Expected payment period remaining | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability, measurement input	0	0
Expected payment period remaining | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability, measurement input	3	3