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Stock-Based Compensation (Details 2) (USD $)
 1 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock option activity          
Number of options, Beginning balance 1,098,241 875,498 1,098,241 926,081  
Number of options, Granted 6,000,000    3,750 257,850  
Number of options, Exercised   (3,629) (1,692) (3,451)  
Number of options, Cancelled (forfeited and expired)   (424,510) (224,801) (82,239)  
Number of options, Ending balance   447,359 875,498 1,098,241 926,081
Number of options, Exercisable   382,856      
Number of options, Vested and expected to vest   437,989      
Weighted-Average Exercise Price          
Weighted-average exercise price per share, Beginning balance $ 20.20 $ 20.13 $ 20.20 $ 22.80  
Weighted-average exercise price per share, Granted      $ 7.30 $ 10.70  
Weighted-average exercise price, Exercised   $ 1.00 $ 1.41 $ 5.70  
Weighted-average exercise price, Cancelled (forfeited and expired)   $ 20.86 $ 20.22 $ 20.50  
Weighted-average exercise price per share, Ending balance   $ 19.59 $ 20.13 $ 20.20 $ 22.80
Weighted-Average Exercise Price, Exercisable   $ 21.06      
Weighted-Average Exercise Price, Vested and expected to vest   $ 19.77      
Weighted-Average Remaining Contractual Term, Outstanding   5 years 1 month 6 days 5 years 6 months 6 years 1 month 6 days 6 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable   4 years 9 months 18 days      
Weighted-Average Remaining Contractual Term, Vested and expected to vest   5 years 1 month 6 days      
Aggregate Intrinsic Value, Outstanding   $ 2,175    $ 398,219 $ 434,092
Aggregate Intrinsic Value, Exercised   4,319 11,293 13,418  
Aggregate Intrinsic Value, Exercisable   2,175      
Aggregate Intrinsic Value, Vested and expected to vest   $ 2,175