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STOCK-BASED COMPENSATION - Narrative (Details) - shares
3 Months Ended
Mar. 31, 2019
Apr. 17, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares)   250,000
Number of shares available for grant (in shares) 42,434  
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentages of stock option ownership considered for higher exercise price of option 10.00%  
Vesting period of stock options 2 years  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option exercise price as percentages of closing exercise price of stock for specific shareholders 110.00%  
Vesting period of stock options 3 years  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period of stock option plan 10 years  
Incentive Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period of stock option plan 5 years  
2017 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares)   181,674
2008 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares)   68,326