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Components and Activity of Facility Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Jul. 01, 2013
Securities Financing Transaction [Line Items]      
Net carrying amount of facility financing agreement $ 25,871 $ 102,300  
Initial commitment asset fair value 13,393    
Commitment asset value included in other assets 8,078    
Tranche B notes
     
Securities Financing Transaction [Line Items]      
Tranche B commitment asset fair value 2,921    
Tranche Two
     
Securities Financing Transaction [Line Items]      
Less portion of commitment asset (3,656)    
Tranche Three
     
Securities Financing Transaction [Line Items]      
Less portion of commitment asset (4,580)    
Senior convertible notes due December 31, 2019
     
Securities Financing Transaction [Line Items]      
Initial principal amount 120,000    
Principal converted to equity (92,500)    
Debt discount-net of amortization (1,546)    
Unaccreted debt issuance expense (83)    
Net carrying amount of facility financing agreement 25,871    
Net carrying amount included in other liabilities 25,900 102,300  
Tranche B commitment asset fair value     2,900
Milestone Rights Liability
     
Securities Financing Transaction [Line Items]      
Initial principal amount 16,276    
Debt discount-net of amortization (51)    
Unaccreted debt issuance expense (61)    
Less current portion of milestone rights included in other current liabilities (3,151)    
Net carrying amount included in other liabilities $ 13,013