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STOCK BASED COMPENSATION - Stock Incentive Plans (Details) - shares
12 Months Ended
Dec. 31, 2017
Jan. 19, 2015
Apr. 26, 2007
2015 Plan | Common Stock      
Stock-based compensation      
Number of shares reserved for issuance under the plan   1,000,000  
2007 Stock Incentive Plan | Stock options      
Stock-based compensation      
Share-based compensation arrangement by share-based payment award, future awards, shares 0    
2007 Stock Incentive Plan | Common Stock      
Stock-based compensation      
Number of shares reserved for issuance under the plan     650,000
Target | Executive officers      
Stock-based compensation      
Shares of common stock granted 431,000