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Stock-Based Compensation (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Options Outstanding  
Number Outstanding (in shares) 9,594
Weighted Average Remaining Contractual Life 3 years 6 months 11 days
Weighted Average Exercise Price (in dollars per share) $ 4.07
Aggregate Intrinsic value (in dollars) $ 574
Options Exercisable  
Number Exercisable (in shares) 6,813
Weighted Average Remaining Contractual Life 2 years 6 months 11 days
Weighted Average Exercise Price (in dollars per share) $ 4.14
Aggregate Intrinsic value (in dollars) 574
$1.50 - $3.23
  
Exercise price range  
Low end of the range (in dollars per share) $ 1.50
High end of the range (in dollars per share) $ 3.23
Options Outstanding  
Number Outstanding (in shares) 2,845
Weighted Average Remaining Contractual Life 3 years 18 days
Weighted Average Exercise Price (in dollars per share) $ 2.68
Aggregate Intrinsic value (in dollars) 574
Options Exercisable  
Number Exercisable (in shares) 1,904
Weighted Average Remaining Contractual Life 2 years 2 months 27 days
Weighted Average Exercise Price (in dollars per share) $ 2.47
Aggregate Intrinsic value (in dollars) $ 574
$3.24 - $4.25
  
Exercise price range  
Low end of the range (in dollars per share) $ 3.24
High end of the range (in dollars per share) $ 4.25
Options Outstanding  
Number Outstanding (in shares) 2,512
Weighted Average Remaining Contractual Life 4 years 1 month 10 days
Weighted Average Exercise Price (in dollars per share) $ 3.82
Options Exercisable  
Number Exercisable (in shares) 1,706
Weighted Average Remaining Contractual Life 4 years
Weighted Average Exercise Price (in dollars per share) $ 3.83
$4.26 - $5.61
  
Exercise price range  
Low end of the range (in dollars per share) $ 4.26
High end of the range (in dollars per share) $ 5.61
Options Outstanding  
Number Outstanding (in shares) 3,377
Weighted Average Remaining Contractual Life 3 years 9 months
Weighted Average Exercise Price (in dollars per share) $ 4.94
Options Exercisable  
Number Exercisable (in shares) 2,473
Weighted Average Remaining Contractual Life 2 years
Weighted Average Exercise Price (in dollars per share) $ 5.09
$5.62 - $7.00
  
Exercise price range  
Low end of the range (in dollars per share) $ 5.62
High end of the range (in dollars per share) $ 7.00
Options Outstanding  
Number Outstanding (in shares) 860
Weighted Average Remaining Contractual Life 2 years 6 months 22 days
Weighted Average Exercise Price (in dollars per share) $ 6.00
Options Exercisable  
Number Exercisable (in shares) 730
Weighted Average Remaining Contractual Life 2 years 4 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 6.00