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STOCK-BASED COMPENSATION - Equity Plans Additional Information (Details) - shares
Jun. 11, 2015
Jan. 11, 2012
May 31, 2006
Sep. 30, 2017
2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance (in shares)       5,727,607
Expiration period of awards issued (in years) 10 years      
2012 Directors Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance (in shares)       539,772
Expiration period of awards issued (in years)   10 years    
Number of shares authorized for issuance (in shares)   600,000    
2012 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of awards issued (in years)   10 years    
2006 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of awards issued (in years)     10 years