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

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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