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STOCK-BASED COMPENSATION - Equity Incentive Plan (Details) - shares
Nov. 30, 2016
May 08, 2014
Dec. 31, 2016
2008 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares authorized (in shares)   2,500,000  
Number of shares authorized (in shares)   9,355,000  
Shares available for grant (in shares)     6,775,475
2016 Additional Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares authorized (in shares) 5,250,000    
Number of shares authorized (in shares) 14,605,000