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STOCK-BASED COMPENSATION - Narrative (Details) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
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) 39,572    
Granted stock options (in shares) 184,667 10,000  
Fair value of stock options granted (in dollars per share) $ 7.29 $ 5.87  
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