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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 29, 2020
General and administrative          
Stock-based compensation          
Allocated share based compensation credit   $ 2,300,000   $ 8,000,000  
Compensation expense recorded $ 600,000   $ 1,800,000    
2016 Incentive Plan          
Stock-based compensation          
Incremental reduction to stock-based compensation expense   1,100,000   $ 9,500,000  
2016 Incentive Plan | Stock options          
Stock-based compensation          
Percentage of awards vesting on the annual anniversary date of the grant     25.00% 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   $ 200,000   $ 200,000  
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   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    
Number of Shares          
Granted (in shares)     600,000    
Restricted stock          
Weighted average grant date fair value of the shares granted     $ 28.32    
Unrecognized compensation expense stock option $ 1,200,000   $ 1,200,000    
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