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SHARE-BASED COMPENSATION PLANS - Narrative (Details)
$ in Millions
1 Months Ended 9 Months Ended
Jun. 30, 2021
shares
Nov. 30, 2020
Jun. 30, 2020
shares
Jan. 31, 2020
shares
Sep. 30, 2021
USD ($)
plan
shares
Sep. 30, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of share-based compensation plans | plan         5  
Expiration period   5 years        
Compensation cost not yet recognized | $         $ 4.0  
Period for recognition         1 year 7 months 6 days  
2019 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares)         250,000  
Additional authorized shares approved (in shares) 500,000   500,000 600,000    
2019 Equity Incentive Plan | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares)         600,540  
Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period         10 years  
Options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period         2 years  
Options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period         4 years  
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Discount rate from grant date fair market value         15.00%  
Issuance of common stock ESPP (in shares)           9,526
Shares available for issuance under ESPP (in shares)         18,488  
ESPP | 2014 Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares)         55,000