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Stock-Based Compensation Arrangements (Details 5) (USD $)
12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Stock options
security
Dec. 31, 2011
Stock options
Dec. 31, 2010
Stock options
Dec. 31, 2011
Stock options
Minimum
Dec. 31, 2010
Stock options
Minimum
Dec. 31, 2012
Stock options
Minimum
Dec. 31, 2011
Stock options
Maximum
Dec. 31, 2010
Stock options
Maximum
Dec. 31, 2012
Stock options
Maximum
Nov. 30, 2008
Restricted Stock
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Feb. 29, 2012
Restricted Stock Units
Nov. 30, 2008
Restricted Stock Units
Dec. 31, 2012
Restricted Stock Units
Dec. 31, 2011
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   6 years 6 years                
Risk free interest rate (as a percent)   0.95%     1.47% 1.64%   2.29% 2.96%                
Volatility (as a percent)   98.00%     93.00% 90.00%   99.00% 102.00%                
Expected dividend yield over expected term (as a percent)   0.00% 0.00% 0.00%                          
Resulting weighted average grant fair value (in dollars per share)   $ 2.52 $ 8.05 $ 9.80                          
Stock based compensation, additional disclosures                                  
Forfeiture rate (as a percent)             0.00%     30.00%              
Income (expense) recognized due to revision of forfeiture rate   $ 100,000 $ (200,000) $ (500,000)                          
Number of Federal Reserve securities whose weighted average is used for calculation of weighted average risk-free interest rate   2                              
Percentage of the award vesting one year from the date of grant 0.25                                
Period for vesting of one-fourth award 1 year                   1 year            
Percentage of the award vesting each month after one year 0.0208                   0.0208            
Total remaining unrecognized compensation cost                       $ 0       $ 100,000  
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost   2 years 3 months 7 days                           1 year 11 months 19 days  
Vesting period 4 years 4 years                       3 years 4 years   3 years
Nonvested activity                                  
Non-vested at the beginning of the period (in shares)                       1,632 3,418     36,463 5,142
Granted (in shares)                     7,142     12,281 13,100 12,281 34,000
Forfeited (in shares)                               (6,904)  
Vested (in shares)                       (1,632) (1,786)     (2,463) (2,679)
Non-vested at the end of the period (in shares)                         1,632     39,377 36,463
Weighted Average Grant Date Value Per Share                                  
Non-vested at the beginning of the period (in dollars per share)                       $ 3.08 $ 3.08     $ 5.60 $ 3.08
Granted (in dollars per share)                               $ 3.85 $ 5.81
Forfeited (in dollars per share)                               $ 4.99  
Vested (in dollars per share)                       $ 3.08 $ 3.08     $ 3.08 $ 3.08
Non-vested at the end of the period (in dollars per share)                         $ 3.08     $ 5.34 $ 5.60