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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, 2020
Dec. 31, 2018
Stock-based compensation        
Number of shares granted   4,163,348 987,590 2,326,961
Aggregate 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  
Aggregate grant date fair value of the shares granted       $ 12.7
Unrecognized compensation expense other than options       $ 6.1
Weighted average remaining vesting period       1 year 1 month 6 days
2016 Incentive Plan | Restricted Stock | Non-employee director        
Stock-based compensation        
Vesting period     6 months  
2020 Incentive Plan | Employee | Tranche One        
Stock-based compensation        
Vesting period     4 years  
Number of shares granted     400,000  
2020 Incentive Plan | Restricted Stock        
Stock-based compensation        
Vesting period     4 years  
2020 Incentive Plan | Restricted Stock | Employee        
Stock-based compensation        
Number of shares granted     1,000,000  
Unrecognized compensation expense other than options     $ 4.1  
2020 Incentive Plan | Restricted Stock | Employee | Tranche One        
Stock-based compensation        
Aggregate average grant date fair value     $ 5.0  
2020 Incentive Plan | Restricted Stock | Employee | Tranche Two        
Stock-based compensation        
Number of shares granted     200,000  
Aggregate average grant date fair value     $ 2.1  
Compensation expense recorded     $ 0.0  
2020 Incentive Plan | Restricted Stock | Employee | Tranche Three        
Stock-based compensation        
Number of shares granted     400,000  
Aggregate average grant date fair value     $ 2.3  
2020 Incentive Plan | Restricted Stock | Non-employee director        
Stock-based compensation        
Weighted average remaining vesting period     2 years 6 months