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Stock-Based Compensation (Details 2) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock-based compensation    
Stock-based compensation expense $ 1,933,000us-gaap_AllocatedShareBasedCompensationExpense $ 13,535,000us-gaap_AllocatedShareBasedCompensationExpense
Stock options    
Stock-based compensation    
Total unrecognized compensation cost related to unvested stock-based compensation 2,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		  
RSUs    
Stock-based compensation    
Total unrecognized compensation cost related to unvested stock-based compensation 2,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		  
Unvested RSAs    
Stock-based compensation    
Total unrecognized compensation cost related to unvested stock-based compensation 9,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		  
Continuing operations    
Stock-based compensation    
Stock-based compensation expense 1,933,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 6,058,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Discontinued operation    
Stock-based compensation    
Stock-based compensation expense 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		 7,477,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Research and development | Continuing operations    
Stock-based compensation    
Stock-based compensation expense 235,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 718,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
General and administrative | Continuing operations    
Stock-based compensation    
Stock-based compensation expense $ 1,698,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 $ 5,340,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember