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Stock-Based Compensation Arrangements (Details 3) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 185 Months Ended 194 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Sep. 30, 2012
May 23, 2012
May 14, 2008
Stock-based compensation                      
Number of shares reserved for issuance                   10,000,000 5,200,000
Number of shares reserved for issuance before amendment                   5,200,000 3,000,000
Compensation cost $ 76,000 $ 221,000 $ 287,000 $ 677,000 $ 882,000 $ 1,746,000 $ 810,000        
Cash proceeds     48,000 3,000 3,000   7,000 173,000 221,000    
Number of options outstanding                      
Exercised (in shares)         (948) (24,902)          
Stock options
                      
Stock-based compensation                      
Weighted average grant-date fair value (in dollars per share)     $ 2.52 $ 8.05 $ 8.05 $ 9.80 $ 2.73        
Total remaining unrecognized compensation cost         500,000     500,000      
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost         2 years 10 months 17 days            
Cash proceeds     48,000 3,000 3,000 100,000 7,000        
Total intrinsic value of options exercised         1,000 200,000 11,000        
Number of options outstanding                      
Options outstanding at the beginning of the period (in shares)     502,249 498,562 498,562 478,554          
Granted (in shares)     33,571 28,500 28,500 86,758          
Exercised (in shares)     (15,438) (948) (948) (24,901) (2,454)        
Cancelled / forfeited (in shares)     (39,970)   (23,865) (41,849)          
Options outstanding at the end of the period (in shares) 480,415   480,415   502,249 498,562 478,554 502,249 480,415    
Unvested at the end of the period (in shares) 77,607   77,607   90,237     90,237 77,607    
Vested and exercisable at the end of the period (in shares) 402,808   402,808   412,012     412,012 402,808    
Weighted average exercise price                      
Options outstanding at the beginning of the period (in dollars per share)     $ 26.11 $ 27.72 $ 27.72 $ 29.47          
Granted (in dollars per share)     $ 3.29   $ 10.64 $ 12.74          
Exercised (in dollars per share)     $ 3.06   $ 2.87 $ 3.01          
Cancelled / forfeited (in dollars per share)     $ 20.03   $ 40.53 $ 31.78          
Options outstanding at the end of the period (in dollars per share) $ 25.76   $ 25.76   $ 26.11 $ 27.72 $ 29.47 $ 26.11 $ 25.76    
Unvested at the end of the period (in dollars per share) $ 9.00   $ 9.00   $ 12.11     $ 12.11 $ 9.00    
Vested and exercisable at the end of the period (in dollars per share) $ 28.99   $ 28.99   $ 29.19     $ 29.19 $ 28.99    
Weighted average remaining contractual term                      
Options outstanding     5 years 10 months 2 days   6 years 5 months 8 days 7 years 2 months 19 days 7 years 9 months 4 days        
Unvested at the end of the period     8 years 8 months 1 day   8 years 9 months            
Vested and exercisable at the end of the period     5 years 3 months 18 days   5 years 11 months 5 days            
Aggregate intrinsic value                      
Options outstanding 212,000   212,000   140,000 938,000 698,000 140,000 212,000    
Unvested at the end of the period 36,000   36,000   3,000     3,000 36,000    
Vested and exercisable at the end of the period 176,000   176,000   136,000     136,000 176,000    
Stock options | Employees and directors
                      
Stock-based compensation                      
Grant date fair value         200,000 600,000 100,000        
Compensation cost         $ 24,000 $ 50,000 $ 28,000        
Weighted average grant-date fair value (in dollars per share)         $ 8.05 $ 9.80 $ 2.73        
Number of options outstanding                      
Granted (in shares)         28,500 100,000 32,000