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Components of Facility Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Securities Financing Transaction [Line Items]  
Net carrying amount of facility financing agreement $ 102,300
Initial commitment asset fair value 13,393
Commitment asset value included in other assets 5,157
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)
Milestone Rights Liability
  
Securities Financing Transaction [Line Items]  
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 13,013
Senior convertible notes due December 31 2019
  
Securities Financing Transaction [Line Items]  
Principal amount 120,000
Principal converted to equity (6,500)
Debt discount-net of amortization (10,834)
Unaccreted debt issuance expense (366)
Net carrying amount of facility financing agreement 102,300
Net carrying amount $ 102,300