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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-based compensation          
Number of shares granted   4,163,348   2,326,961 2,022,432
Weighted average grant date fair value of the shares granted   $ 5.4      
Employees and non-employee directors          
Stock-based compensation          
Number of shares granted 0        
2016 Incentive Plan | Restricted Stock          
Stock-based compensation          
Vesting period     3 years    
Percentage of awards other than options vesting on the annual anniversary date of the grant     33.33%    
Weighted average grant date fair value of the shares granted       $ 12.7 $ 14.3
Unrecognized compensation expense other than options       $ 6.1 $ 3.2
Weighted average remaining vesting period       1 year 1 month 6 days 1 year 4 months 24 days
2016 Incentive Plan | Restricted Stock | Non-employee director          
Stock-based compensation          
Vesting period     6 months