Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Accounting for Share-Based Compensation) (Details)

v2.4.1.9
Basis of Presentation (Accounting for Share-Based Compensation) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basis of Presentation [Line Items]    
Share-based compensation expense total $ 2,914us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 2,067us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Research and development expenses    
Basis of Presentation [Line Items]    
Share-based compensation expense total 920us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
689us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
General and administrative expenses    
Basis of Presentation [Line Items]    
Share-based compensation expense total $ 1,994us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 1,378us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember