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SHARE-BASED COMPENSATION (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options available for issue 600,000      
Exercise price required percentage of fair market value 100.00%      
Award vesting period 4 years      
Intrinsic value of options exercised $ 300,000 $ 600,000 $ 600,000  
Cash received from exercise of stock options 200,000 600,000 900,000  
Fair value of options vested 8,600,000 6,500,000 3,000,000  
Capitalized costs 0 0 0  
Tax benefit from compensation expense 0 $ 0 $ 0  
Compensation cost not yet recognized $ 8,000,000      
Compensation cost not yet recognized, period for recognition 1 year 3 months      
Stock Option Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option contractual terms 5 years      
Stock Option Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option contractual terms 7 years      
2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Stock Purchase Plan, Shares Authorized for Purchase $ 25,000      
Employee Stock Purchase Plan, Purchase Discount, Percent 85.00%      
Employee Stock Purchase Plan, Shares Reserved for Future Issuance       300,000
Issuance of common stock from ESPP purchase (in shares) 61,128      
2013 Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option contractual terms 7 years      
2013 Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option contractual terms 10 years