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STOCK-BASED COMPENSATION (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock options
     
Stock-Based Compensation      
Shares available for issuance 3,352,081    
Shares      
Options Outstanding at beginning of the period (in shares) 4,459,034    
Granted (in shares) 1,144,484    
Exercised (in shares) (52,652)    
Canceled (in shares) (201,056)    
Options Outstanding at the end of the period (in shares) 5,349,810 4,459,034  
Options Vested and Expected to Vest at the end of the period (in shares) 5,279,983    
Options Exercisable at the end of the period (in shares) 3,306,468    
Shares Available for Grant under the 2008 Plan (in shares) 3,352,081    
Weighted Average Exercise Price Per Share      
Options Outstanding at beginning of the period (in dollars per share) $ 6.08    
Granted (in dollars per share) $ 5.83    
Exercised (in dollars per share) $ 2.83    
Canceled (in dollars per share) $ 8.22    
Options Outstanding at the end of the period (in dollars per share) $ 5.98 $ 6.08  
Options Vested and Expected to Vest at the end of the period (in dollars per share) $ 5.99    
Options Exercisable at the end of the period (in dollars per share) $ 6.71    
Weighted Average Remaining Contractual Term      
Options Outstanding at beginning of the period 7 years 6 years 10 months 24 days  
Options Outstanding at the end of the period 7 years 6 years 10 months 24 days  
Options Vested and Expected to Vest at the end of the period 6 years 10 months 24 days    
Options Exercisable at the end of the period 5 years 8 months 12 days    
Additional information      
Total intrinsic value of stock options exercised (in dollars) $ 0.20 $ 0.03 $ 1.00
Weighted average grant-date fair value (in dollars per share) $ 3.67 $ 1.83 $ 2.82
Fair value of stock options vested (in dollars) 2.1 2.6 2.5
Aggregate intrinsic value of stock options outstanding (in dollars) 7.5    
Aggregate intrinsic value of stock options vested and expected to vest (in dollars) 7.4    
Total compensation cost not yet recognized (in dollars) $ 5.2    
Weighted average period over which compensation cost is expected to be recognized as expense 2 years 10 months 24 days    
Restricted Stock
     
Shares      
Outstanding and unvested at the beginning of the period (in shares) 6,000    
Granted (in shares) 12,000    
Vested (in shares) (12,000)    
Outstanding and unvested at the end of the period (in shares) 6,000    
Weighted Average Grant Date Fair Value (per share)      
Outstanding and unvested at the beginning of the period (in dollars per share) $ 3.24    
Granted (in dollars per share) $ 4.50    
Vested (in dollars per share) $ 3.87    
Outstanding and unvested at the end of the period (in dollars per share) $ 4.50    
2004 ESPP Plan
     
Stock-Based Compensation      
Common stock reserved for issuance (in shares) 62,500    
Purchase price as a percentage of the lower of the fair market value of the common stock at either the beginning of the offering period or the applicable exercise date 85.00%    
Shares issued under the plan 5,935 6,627  
Shares available for issuance 38,447    
Shares      
Shares Available for Grant under the 2008 Plan (in shares) 38,447    
2008 Plan
     
Stock-Based Compensation      
Maximum shares of common stock to be issued for grants (in shares) 7,400,000    
Terms of options granted to the holders of more than 10% of the voting stock 5 years    
Threshold percentage of voting stock 10.00%    
Exercise price as a percentage of fair market value for options granted to the holders of more than 10% of the voting stock 110.00%    
2008 Plan | Maximum
     
Stock-Based Compensation      
Vesting period 4 years    
Terms of options 10 years