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Stock-Based Compensation Arrangements (Details 5) (USD $)
 9 Months Ended 12 Months Ended 185 Months Ended 194 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Sep. 30, 2012
Sep. 30, 2009
Stock options
Jun. 30, 2009
Stock options
Sep. 30, 2012
Stock options
security
Sep. 30, 2011
Stock options
Dec. 31, 2011
Stock options
item
Dec. 31, 2010
Stock options
Dec. 31, 2009
Stock options
Sep. 30, 2011
Stock options
Minimum
Dec. 31, 2011
Stock options
Minimum
Dec. 31, 2010
Stock options
Minimum
Dec. 31, 2009
Stock options
Minimum
Sep. 30, 2012
Stock options
Minimum
Sep. 30, 2011
Stock options
Maximum
Dec. 31, 2011
Stock options
Maximum
Dec. 31, 2010
Stock options
Maximum
Dec. 31, 2009
Stock options
Maximum
Sep. 30, 2012
Stock options
Maximum
Nov. 30, 2008
Restricted Stock
Sep. 30, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2010
Restricted Stock
Dec. 31, 2011
Restricted Stock Units
Nov. 30, 2008
Restricted Stock Units
Mar. 31, 2012
Restricted Stock Units
Sep. 30, 2012
Restricted Stock Units
Dec. 31, 2011
Restricted Stock Units
Dec. 31, 2010
Restricted Stock Units
Dec. 31, 2008
Restricted Stock Units
Fair value of the stock options granted calculated using Black-Scholes option-pricing model assumptions                                                                      
Expected term                   6 years         5 years 5 years 5 years 9 months   6 years 6 years 6 years 5 years                        
Risk free interest rate (as a percent)                   0.95%         1.47% 1.47% 1.64% 0.325%   2.29% 2.29% 2.96% 0.84%                        
Volatility (as a percent)                   98.00%         93.00% 93.00% 90.00% 65.00%   99.00% 99.00% 102.00% 169.00%                        
Dividends (as a percent)                       0.00% 0.00% 0.00%                                          
Resulting weighted average grant fair value (in dollars per share)                   $ 2.52 $ 8.05 $ 8.05 $ 9.80 $ 2.73                                          
Stock based compensation, additional disclosures                                                                      
Forfeiture rate (as a percent)                               0.00%     0.00%   50.00%     30.00%                      
Income (expense) recognized due to revision of forfeiture rate                       $ (38,000) $ (500,000) $ 500,000                                          
Number of Federal Reserve securities whose weighted average is used for calculation of weighted average risk-free interest rate                   2   2                                              
Cash proceeds 48,000 3,000 3,000   7,000 173,000 221,000     48,000 3,000 3,000 100,000 7,000                                          
Exercised (in shares)     (948) (24,902)           (15,438) (948) (948) (24,901) (2,454)                                          
Post termination period for exercise of vested options before modification of plan                       30 days                                              
Post termination period for exercise of vested options                       9 months                                              
Stock-based compensation expense recorded due to plan modification               300,000 300,000                                                    
Percentage of the award vesting one year from the date of grant     0.25             0.25                             0.25                    
Period for vesting of one-fourth award     1 year             1 year                             1 year                    
Percentage of the award vesting each month after one year     0.0208             0.0208                             0.0208                    
Total remaining unrecognized compensation cost                                                     $ 3,000   $ 100,000       $ 100,000    
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost                       2 years 10 months 17 days                             10 months 17 days           2 years 9 months 11 days    
Vesting period     4 years             4 years                                       4 years   3 years 3 years   4 years
Nonvested activity                                                                      
Non-vested at the beginning of the period (in shares)                                                   1,632 3,418 5,204     36,463 36,463 5,142 7,812  
Granted (in shares)                                                 7,142       34,000 13,100 12,281 12,281 34,000    
Vested (in shares)                                                   (1,341) (1,786) (1,786)       (2,010) (2,679) (2,670)  
Non-vested at the end of the period (in shares)                                                   291 1,632 3,418 36,463     39,830 36,463 5,142  
Weighted Average Grant Date Value Per Share                                                                      
Non-vested at the beginning of the period (in dollars per share)                                                   $ 3.08 $ 3.08 $ 3.08     $ 5.60 $ 5.60 $ 3.08 $ 3.08  
Granted (in dollars per share)                                                               $ 3.85 $ 5.81    
Vested (in dollars per share)                                                   $ 3.08 $ 3.08 $ 3.08       $ 3.08 $ 3.08 $ 3.08  
Non-vested at the end of the period (in dollars per share)                                                   $ 3.08 $ 3.08 $ 3.08 $ 5.60     $ 5.32 $ 5.60 $ 3.08