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INCOME TAXES - Tax Summary of Stockholder Rights Plan (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 13, 2013
item
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Rights Plan        
Annual limitation on net operating losses   $ 14,284    
Unrecognized tax benefits   27 $ 56 $ 81
Unrecognized tax benefits, including accrued interest and penalties     140  
Decrease in unrecognized tax benefits as a result of the expiration of the applicable statutes of limitations within the next twelve months   69    
Accrued interest or penalties related to uncertain tax positions recognized   42 $ 84  
Favorable Tax Impact Member        
Rights Plan        
Unrecognized tax benefits, including accrued interest and penalties   $ 69    
Series A Junior Participating Preferred Stock        
Rights Plan        
Number of rights for each outstanding share of common stock | item 1      
Number of preferred share purchase rights for each outstanding share of the company's common stock | shares 0.001      
Exercise price (in dollars per right) | $ / shares $ 9.81      
Series A Junior Participating Preferred Stock | Minimum        
Rights Plan        
Threshold percentage of beneficial ownership for significant dilution of ownership interest 4.90%      
Current beneficial ownership percentage that will not trigger the preferred share purchase rights unless they acquire additional shares 4.90%      
Series A Junior Participating Preferred Stock | Maximum        
Rights Plan        
Beneficial ownership percentage of any person or group, together with its affiliates and associates 4.90%