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STOCK-BASED COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Nov. 12, 2019
USD ($)
shares
Feb. 08, 2018
shares
Sep. 30, 2019
USD ($)
user
shares
Jun. 30, 2018
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
user
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
shares
Feb. 28, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Capital Lease Obligations Incurred | $           $ 0.1    
Number of shares authorized (in shares)   1,875,000            
Number of shares remaining available for issuance (in shares)   61,247            
Number of shares authorized, annual increase             5.00%  
Award vesting period         4 years      
Expiration period         10 years      
Weighted-average grant date fair value (in usd per share) | $ / shares       $ 10.00 $ 0.47      
Options vested in period, fair value | $       $ 5.0 $ 3.2      
Compensation not yet recognized | $     $ 3.6   $ 3.6      
Common stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Compensation cost not yet recognized         1 year 3 months 18 days      
Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)         1,792,000      
Unvested PSU (in shares)     1,737,000   1,737,000   381,000  
Compensation cost not yet recognized         3 years 21 days   2 years 5 months 1 day  
Restricted stock units | Share-based Compensation Award, Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)         539,523      
Performance Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested PSU (in shares)     1,252,500   1,252,500     875,000
Compensation cost, modification | $       $ 6.9        
Performance Shares [Member] | Share-based Compensation Award, Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
RSU, performance condition, period         3 years      
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Conditions | user     0.50   0.50      
Performance Shares [Member] | Share-based Compensation Award, Tranche Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
RSU, performance condition, period         5 years      
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Conditions | user     0.25   0.25      
Performance Shares [Member] | Share-based Compensation Award, Tranche Three [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Conditions | user     0.25   0.25      
ESPP                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized, annual increase             1.00%  
ESPP, purchase price percentage   85.00%            
ESPP, number of shares authorized, annual increase (in shares)     500,000   500,000      
Employees and non-employee directors | Minimum | Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period     1 year          
Employees and non-employee directors | Maximum | Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period         4 years      
Subsequent Event | Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 4 years              
Granted (in shares) 186,309              
Compensation not yet recognized, awards other than options | $ $ 6.8