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Stock-Based Compensation - Summary of Stock Option Information by Exercise Price (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Outstanding options 11,312,218  
Options outstanding, weighted average remaining contractual life 8 years 15 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 2.83  
Exercisable options 4,612,219  
Options exercisable, weighted average exercise price per share (in usd per share) $ 3.55  
$0.00 to $1.50    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   $ 0.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   1.50
Outstanding options 86,225  
Options outstanding, weighted average remaining contractual life 9 months 22 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 1.37  
Exercisable options 86,225  
Options exercisable, weighted average exercise price per share (in usd per share) $ 1.37  
$1.51 to $3.00    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   1.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   3.00
Outstanding options 9,371,294  
Options outstanding, weighted average remaining contractual life 8 years 5 months 19 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 2.08  
Exercisable options 3,136,714  
Options exercisable, weighted average exercise price per share (in usd per share) $ 2.14  
$3.01 to $4.50    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   3.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   4.50
Outstanding options 298,790  
Options outstanding, weighted average remaining contractual life 6 years 9 months 22 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 3.77  
Exercisable options 170,688  
Options exercisable, weighted average exercise price per share (in usd per share) $ 3.70  
$4.51 to $6.00    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   4.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   6.00
Outstanding options 342,493  
Options outstanding, weighted average remaining contractual life 7 years 9 months 26 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 5.56  
Exercisable options 201,800  
Options exercisable, weighted average exercise price per share (in usd per share) $ 5.55  
$6.01 to $7.50    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   6.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   7.50
Outstanding options 619,191  
Options outstanding, weighted average remaining contractual life 4 years 11 months 9 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 6.30  
Exercisable options 550,267  
Options exercisable, weighted average exercise price per share (in usd per share) $ 6.30  
$7.51 to $9.00    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   7.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   9.00
Outstanding options 394,028  
Options outstanding, weighted average remaining contractual life 6 years 5 months 27 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 8.71  
Exercisable options 291,491  
Options exercisable, weighted average exercise price per share (in usd per share) $ 8.70  
$9.01 to $10.50    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   9.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   10.50
Outstanding options 167,697  
Options outstanding, weighted average remaining contractual life 6 years 1 month 21 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 9.61  
Exercisable options 142,534  
Options exercisable, weighted average exercise price per share (in usd per share) $ 9.63  
$10.51 to $12.00    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   10.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   $ 12.00
Outstanding options 32,500  
Options outstanding, weighted average remaining contractual life 5 years 7 months 24 days  
Options outstanding, weighted average exercise price per share (in usd per share) $ 11.96  
Exercisable options 32,500  
Options exercisable, weighted average exercise price per share (in usd per share) $ 11.96