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Stock-Based Compensation (Details 4) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Options Outstanding    
Weighted Average Remaining Contractual Life 4 years 4 months 6 days  
Vested and expected to vest Options Outstanding, Number Outstanding 8,415  
Vested and expected to vest Options Outstanding, Weighted Average Exercise Price $ 3.69  
Exercisable, Number Outstanding 6,109  
Exercisable, Weighted Average Exercise Price $ 3.98  
Options Exercisable    
Weighted Average Remaining Contractual Life 3 years 1 month 17 days  
$1.68 - $2.24    
Exercise price range    
Low end of the range (in dollars per share) $ 1.68  
High end of the range (in dollars per share) $ 2.24  
Options Outstanding    
Number Outstanding (in shares) 1,612  
Weighted Average Exercise Price (in dollars per share) $ 2.01  
Options Exercisable    
Number Exercisable (in shares) 261  
Weighted Average Exercise Price (in dollars per share) $ 2.05  
Weighted Average Remaining Contractual Life 9 years 2 months 9 days  
$2.25 - $3.15    
Exercise price range    
Low end of the range (in dollars per share) $ 2.25  
High end of the range (in dollars per share) $ 3.15  
Options Outstanding    
Number Outstanding (in shares) 1,429  
Weighted Average Exercise Price (in dollars per share) $ 2.97  
Options Exercisable    
Number Exercisable (in shares) 1,196  
Weighted Average Exercise Price (in dollars per share) $ 2.96  
Weighted Average Remaining Contractual Life 2 years 11 months 9 days  
$3.16 - $3.80    
Exercise price range    
Low end of the range (in dollars per share) $ 3.16  
High end of the range (in dollars per share) $ 3.80  
Options Outstanding    
Number Outstanding (in shares) 1,483  
Weighted Average Exercise Price (in dollars per share) $ 3.42  
Options Exercisable    
Number Exercisable (in shares) 1,239  
Weighted Average Exercise Price (in dollars per share) $ 3.43  
Weighted Average Remaining Contractual Life 2 years 10 months 24 days  
$3.81 - $4.34    
Exercise price range    
Low end of the range (in dollars per share) $ 3.81  
High end of the range (in dollars per share) $ 4.34  
Options Outstanding    
Number Outstanding (in shares) 1,435  
Weighted Average Exercise Price (in dollars per share) $ 3.96  
Options Exercisable    
Number Exercisable (in shares) 1,222  
Weighted Average Exercise Price (in dollars per share) $ 3.96  
Weighted Average Remaining Contractual Life 3 years 3 months 29 days  
$4.35 - $4.69    
Exercise price range    
Low end of the range (in dollars per share) $ 4.35  
High end of the range (in dollars per share) $ 4.69  
Options Outstanding    
Number Outstanding (in shares) 1,386  
Weighted Average Exercise Price (in dollars per share) $ 4.47  
Options Exercisable    
Number Exercisable (in shares) 974  
Weighted Average Exercise Price (in dollars per share) $ 4.46  
Weighted Average Remaining Contractual Life 5 years 6 months 29 days  
$4.70 - $6.11    
Exercise price range    
Low end of the range (in dollars per share) $ 4.70  
High end of the range (in dollars per share) $ 6.11  
Options Outstanding    
Number Outstanding (in shares) 1,290  
Weighted Average Exercise Price (in dollars per share) $ 5.56  
Options Exercisable    
Number Exercisable (in shares) 1,217  
Weighted Average Exercise Price (in dollars per share) $ 5.57  
Weighted Average Remaining Contractual Life 2 years 4 days  
$1.68 - $6.11    
Exercise price range    
Low end of the range (in dollars per share) $ 1.68  
High end of the range (in dollars per share) $ 6.11  
Options Outstanding    
Number Outstanding (in shares) 8,635  
Weighted Average Exercise Price (in dollars per share) $ 3.66  
Options Exercisable    
Number Exercisable (in shares) 6,109  
Weighted Average Exercise Price (in dollars per share) $ 3.98  
Weighted Average Remaining Contractual Life 4 years 5 months 12 days  
Options    
Options Exercisable    
Total intrinsic value of awards exercised (in dollars) $ 0.3 $ 0.7