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Equity Incentive Plans and Stock-Based Compensation (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
Exercise price range $4.13 - $5.32
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 4.13
Exercise price range, high end of range (in dollars per share) $ 5.32
Options Outstanding  
Number Outstanding (in shares) 1,318,083
Weighted Average Remaining Contractual Life (in years) 9 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.35
Options Exercisable  
Number Exercisable (in shares) 9,956
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.87
Exercise price range $5.63 - $5.63
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 5.63
Exercise price range, high end of range (in dollars per share) $ 5.63
Options Outstanding  
Number Outstanding (in shares) 2,119,123
Weighted Average Remaining Contractual Life (in years) 6 years 3 months 4 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.63
Options Exercisable  
Number Exercisable (in shares) 0
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.00
Exercise price range $5.76 - $6.39
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 5.76
Exercise price range, high end of range (in dollars per share) $ 6.39
Options Outstanding  
Number Outstanding (in shares) 1,394,307
Weighted Average Remaining Contractual Life (in years) 9 years 5 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.81
Options Exercisable  
Number Exercisable (in shares) 17,934
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 6.39
Exercise price range $7.06 - $7.17
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 7.06
Exercise price range, high end of range (in dollars per share) $ 7.17
Options Outstanding  
Number Outstanding (in shares) 135,545
Weighted Average Remaining Contractual Life (in years) 8 years 3 months 29 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 7.06
Options Exercisable  
Number Exercisable (in shares) 32,445
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 7.06
Exercise price range $7.31 - $7.31
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 7.31
Exercise price range, high end of range (in dollars per share) $ 7.31
Options Outstanding  
Number Outstanding (in shares) 1,370,149
Weighted Average Remaining Contractual Life (in years) 8 years 10 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 7.31
Options Exercisable  
Number Exercisable (in shares) 279,665
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 7.31
Exercise price range $7.70 - $13.21
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 7.70
Exercise price range, high end of range (in dollars per share) $ 13.21
Options Outstanding  
Number Outstanding (in shares) 1,330,843
Weighted Average Remaining Contractual Life (in years) 5 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 9.29
Options Exercisable  
Number Exercisable (in shares) 990,415
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 9.39
Exercise price range $13.30 - $18.69
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 13.30
Exercise price range, high end of range (in dollars per share) $ 18.69
Options Outstanding  
Number Outstanding (in shares) 1,885,637
Weighted Average Remaining Contractual Life (in years) 3 years 3 months 22 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 16.64
Options Exercisable  
Number Exercisable (in shares) 1,703,140
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 16.87
Exercise price range $19.13 - $21.51
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 19.13
Exercise price range, high end of range (in dollars per share) $ 21.51
Options Outstanding  
Number Outstanding (in shares) 1,497,065
Weighted Average Remaining Contractual Life (in years) 4 years 9 months
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 20.19
Options Exercisable  
Number Exercisable (in shares) 1,248,319
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 20.06
Exercise price range $21.95 - $30.05
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 21.95
Exercise price range, high end of range (in dollars per share) $ 30.05
Options Outstanding  
Number Outstanding (in shares) 1,380,063
Weighted Average Remaining Contractual Life (in years) 3 years 9 months 26 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 23.59
Options Exercisable  
Number Exercisable (in shares) 1,183,855
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 23.70
Exercise price range $32.05 - $40.80
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 32.05
Exercise price range, high end of range (in dollars per share) $ 40.80
Options Outstanding  
Number Outstanding (in shares) 664,000
Weighted Average Remaining Contractual Life (in years) 1 year 9 months 26 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 36.46
Options Exercisable  
Number Exercisable (in shares) 664,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 36.46
Exercise price range $4.13 - $40.80
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 4.13
Exercise price range, high end of range (in dollars per share) $ 40.80
Options Outstanding  
Number Outstanding (in shares) 13,094,815
Weighted Average Remaining Contractual Life (in years) 6 years 0 months 15 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 12.79
Options Exercisable  
Number Exercisable (in shares) 6,129,729
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 19.21