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COMMON STOCK AND STOCK INCENTIVE PLANS - Stock Option Activity (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
2017 Equity Incentive Plan      
Number of shares outstanding      
Options Outstanding at the beginning of the period (in shares) 605    
Options Exercised (in shares) (52)    
Options Forfeited or Expired (in shares) (309)    
Options Outstanding at the end of the period (in shares) 244 605  
Weighted average exercise price      
Options Outstanding at the beginning of the period (in dollars per share) $ 2.78    
Options Exercised (in dollars per share) 2.62    
Options Forfeited or Expired (in dollars per share) 3.22    
Options Outstanding at the end of the period (in dollars per share) $ 2.26 $ 2.78  
2006 Equity Incentive Plan      
Number of shares outstanding      
Options Outstanding at the beginning of the period (in shares) 605 415 558
Options Granted (in shares)   267  
Options Exercised (in shares)     (12)
Options Forfeited or Expired (in shares)   (77) (131)
Options Outstanding at the end of the period (in shares)   605 415
Weighted average exercise price      
Options Outstanding at the beginning of the period (in dollars per share) $ 2.78 $ 6.11 $ 6.33
Options Granted (in dollars per share)   2.24  
Options Exercised (in dollars per share)     3.48
Options Forfeited or Expired (in dollars per share)   18.79 7.30
Options Outstanding at the end of the period (in dollars per share)   $ 2.78 $ 6.11