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STOCK-BASED COMPENSATION - Board of Directors Compensation - Additional Information (Details) - Director [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Restricted stock awards and units vesting terms     1 year  
Fair value of shares issued $ 370,000 $ 369,000 $ 1,300,000 $ 1,100,000
Shares issued (in shares)     21,250 22,500