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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 29, 2020
Apr. 06, 2017
General and administrative          
Stock-based compensation          
Allocated share based compensation credit   $ 6,800,000      
Compensation expense recorded $ 400,000        
2016 Incentive Plan          
Stock-based compensation          
Incremental reduction to stock-based compensation expense   $ 8,400,000      
2016 Incentive Plan | Common Stock          
Stock-based compensation          
Aggregate number of shares available         19,000,000
2016 Incentive Plan | Stock options          
Stock-based compensation          
Share Based Compensation Arrangements by Share Based Payment Award Options Annual Vesting Percentage.     33.33%    
Vesting period     3 years    
Expiration term     10 years    
Weighted average remaining vesting period   9 months 18 days      
Number of Shares          
Granted (in shares)   0      
Restricted stock          
Unrecognized compensation expense stock option   $ 1,500,000      
2020 Incentive Plan | Common Stock          
Stock-based compensation          
Aggregate number of shares available       1,500,000  
2020 Incentive Plan | Common Stock | Maximum          
Stock-based compensation          
Maximum number of shares that remained reserved for issuance under the Plan 200,000        
2020 Incentive Plan | Stock options          
Stock-based compensation          
Vesting period 4 years        
Expiration term 7 years        
Weighted average remaining vesting period 2 years 4 months 24 days        
Number of Shares          
Granted (in shares) 500,000        
Restricted stock          
Weighted average grant date fair value of the shares granted $ 28.32        
Unrecognized compensation expense stock option $ 1,500,000        
2020 Incentive Plan | Stock options | Minimum          
Weighted Average Exercise Price Per Share          
Exercised (in dollars per share) $ 18.91        
2020 Incentive Plan | Stock options | Maximum          
Weighted Average Exercise Price Per Share          
Exercised (in dollars per share) $ 37.83