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EMPLOYEE STOCK PLANS - Summary of activity under the employee stock plans (Details) (Employee Stock Plans, USD $)
3 Months Ended
Mar. 31, 2013
Stock Options
 
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding - December 31, 2012 15,441,703
Exercisable - December 31, 2012 5,394,503
Granted   
Exercised or Vested (39,200)
Forfeited or Expired (28,120)
Outstanding - March 31, 2013 15,413,584
Exercisable - March 31, 2013 5,405,584
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Outstanding - December 31, 2012 $ 0.35
Exercisable - December 31, 2012 $ 0.51
Granted $ 0.00
Exercised or Vested $ 2.21
Forfeited or Expired $ 0.60
Outstanding - March 31, 2013 $ 0.35
Exercisable - March 31, 2013 $ 0.52
Restricted Stock
 
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Outstanding - December 31, 2012 4,235,164
Exercisable - December 31, 2012   
Granted 1,908,602
Exercised or Vested (2,967,392)
Forfeited or Expired   
Outstanding - March 31, 2013 3,176,374
Exercisable - March 31, 2013