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Stock-Based Compensation Arrangements (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Number of Options Outstanding      
Exercised (in shares)   (33,351) (948)
Stock options
      
Number of Options Outstanding      
Options outstanding at the beginning of the period (in shares) 463,023 502,249  
Granted (in shares) 494,663 33,571  
Exercised (in shares)    (33,351) (948)
Cancelled / forfeited (in shares) (8,001) (39,446)  
Options outstanding at the end of the period (in shares) 949,685 463,023 502,249
Unvested at December 31, 2013 528,754    
Vested and exercisable at December 31, 2013 420,931    
Weighted Average Exercise Price Per Share      
Options outstanding at the beginning of the period (in dollars per share) $ 26.61 $ 26.11  
Granted (in dollars per share) $ 4.22 $ 3.29  
Exercised (in dollars per share)    $ 3.09  
Cancelled / forfeited (in dollars per share) $ 18.55 $ 20.21  
Options outstanding at the end of the period (in dollars per share) $ 15.02 $ 26.61 $ 26.11
Unvested at the end of the period (in dollars per share) $ 4.49    
Vested and exercisable at the end of the period (in dollars per share) $ 28.25    
Weighted Average Remaining Contractual Term (Years)      
Options outstanding 7 years 4 months 17 days 6 years 5 months 9 days  
Unvested at the end of the period 9 years 9 months 4 days    
Vested and exercisable at the end of the period 4 years 4 months 24 days 5 years 6 months 29 days  
Aggregate Intrinsic Value      
Options outstanding $ 152 $ 140  
Unvested at the end of the period 50     
Vested and exercisable at the end of the period $ 101 $ 347