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Basis of Presentation and Summary of Significant Accounting Policies (Accounting for Share-Based Compensation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basis of Presentation [Line Items]
Share-based compensation expense total	$ 5,248	$ 5,331	$ 15,917	$ 13,690
Research and development expenses
Basis of Presentation [Line Items]
Share-based compensation expense total	2,394	2,845	8,260	6,112
General and administrative expenses
Basis of Presentation [Line Items]
Share-based compensation expense total	$ 2,854	$ 2,486	$ 7,657	$ 7,578

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- Definition

Basis of presentation.

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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