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Basis of Presentation (Accounting for Share-Based Compensation) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Basis of Presentation [Line Items] |  |
Share-based compensation expense total | $ 2,914 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 2,067 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Research and development expenses |  |
Basis of Presentation [Line Items] |  |
Share-based compensation expense total | 920 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 689 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
General and administrative expenses |  |
Basis of Presentation [Line Items] |  |
Share-based compensation expense total | $ 1,994 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 1,378 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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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. + Details
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