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Stockholders' Equity - Unrecognized Compensation Cost (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Equity Incentive Plans  
Unrecognized compensation cost $ 44.1
Stock Options  
Equity Incentive Plans  
Unrecognized compensation cost $ 41.7
Stock Options And Restricted Stock Units  
Equity Incentive Plans  
Recognition of share-based compensation expense (in years) 3 years 3 months 18 days
Stock Options And Restricted Stock Units | Non-employee directors | June 2016 Award Date  
Equity Incentive Plans  
Unrecognized compensation cost $ 2.3