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STOCK-BASED COMPENSATION - Narrative (Details)
$ in Millions
6 Months Ended
Jul. 29, 2020
USD ($)
shares
Feb. 08, 2018
shares
Jun. 30, 2020
USD ($)
user
shares
Jun. 30, 2019
USD ($)
Jan. 01, 2020
shares
Dec. 31, 2019
shares
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Lease Obligation Incurred | $     $ 0.2 $ 0.1      
Number of shares authorized (in shares)   1,875,000       1,345,631  
Number of shares remaining available for issuance (in shares)   61,247          
Award vesting period     4 years        
Expiration period     10 years        
Options vested in period, fair value | $     $ 1.4        
Compensation not yet recognized | $     $ 1.3        
Common stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation cost not yet recognized     8 months 12 days        
Restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period     4 years        
Granted (in shares)     1,544,000        
Unvested PSU (in shares)     2,627,000     1,741,000  
Compensation cost not yet recognized     3 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)     1,057,978        
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested PSU (in shares)     1,252,500        
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        
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        
Performance Shares [Member] | Share-based Payment Arrangement, 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        
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   265,470,000 267,823,000  
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]              
Granted (in shares) 91,593            
Compensation not yet recognized, awards other than options | $ $ 6.1