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STOCK-BASED COMPENSATION - Weighted Average Assumptions (Details) - Employee Stock Option, Serviced-Based
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected stock price volatility 0.00% 0.00%
Expected dividend yield 0.00% 0.00%
Risk-free interest rate 0.00% 0.00%