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Stock-Based Compensation (Details) (Service-based stock option, USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Stock-Based Compensation          
Vesting period     4 years    
Expiration period     10 years    
Weighted average grant-date fair value (in dollars per share)     $ 1.25 $ 1.54  
Net compensation costs related to employees and directors $ 1,127,000 $ 919,000 $ 3,166,000 $ 2,767,000  
Weighted average assumptions used to estimate fair value of each service-based stock option grant          
Expected dividend rate (as a percent)     0.00% 0.00%  
Expected stock price volatility, low end of range (as a percent)     72.90% 72.90%  
Expected stock price volatility, high end of range (as a percent)     74.90% 78.90%  
Risk-free interest rate, low end of range (as a percent)     0.90% 1.70%  
Risk-free interest rate, high end of range (as a percent)     1.50% 2.70%  
Options          
Outstanding at the beginning of the period (in shares)     8,079,667    
Granted (in shares)     4,507,445    
Exercised (in shares)     (144,167)    
Cancelled (in shares)     (1,057,700)    
Forfeited or expired (in shares)     (828,432)    
Outstanding at the end of the period (in shares) 10,556,813   10,556,813   8,079,667
Exercisable at the end of the period (in shares) 3,727,232   3,727,232    
Weighted Average Exercise Price          
Outstanding at the beginning of the period (in dollars per share)     $ 2.38    
Granted (in dollars per share)     $ 2.36    
Exercised (in dollars per share)     $ 1.48    
Cancelled (in dollars per share)     $ 2.03    
Forfeited or expired (in dollars per share)     $ 2.20    
Outstanding at the end of the period (in dollars per share) $ 2.43   $ 2.43   $ 2.38
Exercisable at the end of the period (in dollars per share) $ 2.75   $ 2.75    
Weighted Average Remaining Contractual Term          
Outstanding at the beginning of the period     8 years 4 months 24 days   8 years 4 months 24 days
Outstanding at the end of the period     8 years 4 months 24 days   8 years 4 months 24 days
Exercisable at the end of the period     7 years 3 months 18 days    
Aggregate Intrinsic Value          
Outstanding at the beginning of the period     674,000    
Exercised     52,000    
Outstanding at the end of the period 206,000   206,000   674,000
Exercisable at the end of the period 119,000   119,000    
Additional disclosures          
Total unrecognized compensation cost 6,603,000   6,603,000    
Weighted average period over which unrecognized compensation is expected to be recognized     3 years    
Total fair value of options vested     $ 2,136,000 $ 1,582,000  
Minimum
          
Weighted average assumptions used to estimate fair value of each service-based stock option grant          
Expected life     6 years 6 years  
Maximum
          
Weighted average assumptions used to estimate fair value of each service-based stock option grant          
Expected life     6 years 3 months 18 days 6 years 3 months 18 days