Stockholders' Equity - Equity Incentive Plans (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) item $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares
Equity Incentive Plans
Number of equity incentive plans | item	2
Stock Incentive Plan 1999 And 2015 Plan
Equity Incentive Plans
Number of shares of common stock into which each restricted stock unit is entitled	1
Amended and Restated Equity Incentive Plan (The 1999 Plan)
Options disclosures
Granted (in shares)	0	0
Stock Incentive Plan 2015 (The 2015 Plan)
Equity Incentive Plans
Maximum number of shares authorized to be issued	6,150,000
Stock Options
Options disclosures
Granted (in shares)	1,625,552
Aggregate grant date fair value | $	$ 19.9
Stock Options | Stock Incentive Plan 2015 (The 2015 Plan)
Options disclosures
Granted (in shares)	1,600,000	200,000
Weighted average grant date fair value of stock options (in dollars per share) | $ / shares	$ 42.54	$ 60.77
Aggregate grant date fair value | $	$ 69.1	$ 9.9
Restricted stock units | Stock Incentive Plan 2015 (The 2015 Plan)
Restricted stock units disclosures
Granted (in shares)	20,960
Awards granted during the period, weighted average grant date fair value (in dollars per share) | $ / shares	$ 101.80
Aggregate grant date fair value | $	$ 2.1