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STOCKHOLDERS' EQUITY (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
STOCKHOLDERS' EQUITY      
Number of options granted with exercise price other than fair market value of Company's common stock 0 0 0
Shares Available For Grant      
Balance at the beginning of the period (in shares) 13,557,771    
Options granted (in shares) (6,366,000)    
Awards granted (in shares) (66,853)    
Options canceled/forfeited (in shares) 6,641,045    
Awards canceled/forfeited (in shares) 2,441,287    
Balance at the end of the period (in shares) 16,207,250 13,557,771  
Number of Shares      
Balance at the beginning of the period (in shares) 17,811,506    
Options granted (in shares) 6,366,000    
Options exercised (in shares) (1,960,245)    
Options canceled/forfeited (in shares) (6,641,045)    
Balance at the end of the period (in shares) 15,576,216 17,811,506  
Options exercisable at the end of the period (in shares) 8,144,040 10,410,194 10,109,076
Options fully vested and expected to vest at the end of the period (in shares) 15,122,068    
Weighted Average Exercise Price Per Share      
Balance at the beginning of the period (in dollars per share) $ 4.05    
Options granted (in dollars per share) $ 1.57    
Options exercised (in dollars per share) $ 3.35    
Options canceled/forfeited (in dollars per share) $ 4.25    
Balance at the end of the period (in dollars per share) $ 3.04 $ 4.05  
Options exercisable at the end of the period (in dollars per share) $ 4.26 $ 5.49 $ 6.02
Options fully vested and expected to vest at the end of the period (in dollars per share) $ 3.08    
Weighted Average Remaining Contractual Life (In years)      
Balance at the end of the period 6 years 9 months 29 days    
Options exercisable at the end of the period 5 years 18 days    
Options fully vested and expected to vest at the end of the period 6 years 9 months 7 days    
Aggregate Intrinsic Value      
Balance at the end of the period (in dollars) $ 33,798,000 $ 2,000  
Options exercisable at the end of the period (in dollars) 11,194,000    
Options fully vested and expected to vest at the end of the period (in dollars) 32,402,000    
Closing stock price (in dollars per share) $ 4.74    
Total pretax intrinsic value of stock options exercised (in dollars) 2,787,000 100 56,000
Cash received from exercise of options (in dollars) 6,567,000 1,000 184,000
Income tax benefit realized from stock options exercised $ 0    
2002 Plan
      
STOCKHOLDERS' EQUITY      
Vesting period of options 4 years    
Vesting period for specific portion of options 6 months    
Exercise price of options as a percentage of fair market value 100.00%    
2002 Plan | Maximum
      
STOCKHOLDERS' EQUITY      
Expiration term of options from date of grant 10 years    
2011 Plan
      
STOCKHOLDERS' EQUITY      
Vesting period of options 4 years    
Vesting period for specific portion of options 6 months    
Exercise price of options as a percentage of fair market value 100.00%    
Minimum percentage of ownership required for granting options at least 110% of fair market value of common stock 10.00%    
Minimum exercise price as a percentage of fair market value for employees having more than 10 % outstanding common stock 110.00%    
Maximum expiration term of options granted to employees having more than 10 % outstanding common stock 5 years    
Number of shares outstanding subject to repurchase 0    
Shares Available For Grant      
Balance at the end of the period (in shares) 15,655,348    
2011 Plan | Maximum
      
STOCKHOLDERS' EQUITY      
Expiration term of options from date of grant 10 years    
1996 Directors Plan
      
STOCKHOLDERS' EQUITY      
Percentage of option vesting 100.00%    
1996 Directors Plan | Maximum
      
STOCKHOLDERS' EQUITY      
Expiration term of options from date of grant 10 years    
1996 Directors Plan | First Option
      
STOCKHOLDERS' EQUITY      
Vesting period of options 3 years    
2006 Directors Plan
      
STOCKHOLDERS' EQUITY      
Expiration term of options from date of grant 10 years    
Exercise price of options as a percentage of fair market value 100.00%    
Shares Available For Grant      
Balance at the end of the period (in shares) 551,902    
2006 Directors Plan | First Director Option
      
STOCKHOLDERS' EQUITY      
Vesting period of options 3 years    
Options to be granted to purchase shares upon appointment (in shares) 70,000    
2006 Directors Plan | Subsequent Director Option
      
STOCKHOLDERS' EQUITY      
Vesting period of options 1 year    
Options to be granted to purchase shares (in shares) 35,000