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Significant Accounting Policies (Accounting for Share-Based Compensation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basis of Presentation [Line Items]
Share-based compensation expense total	$ 4,240	$ 3,760	$ 8,359	$ 6,675
Research and development expenses
Basis of Presentation [Line Items]
Share-based compensation expense total	1,682	1,253	3,267	2,174
General and administrative expenses
Basis of Presentation [Line Items]
Share-based compensation expense total	$ 2,558	$ 2,507	$ 5,092	$ 4,501

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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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