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Components of Facility Financing Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Securities Financing Transaction [Line Items]  
Net carrying amount of facility financing obligation $ 72,933
Initial commitment asset fair value 13,393
Commitment asset value included in other assets 9,737
Tranche Two
  
Securities Financing Transaction [Line Items]  
Less Tranche 2 portion of commitment asset (3,656)
Senior convertible notes due December 31 2019
  
Securities Financing Transaction [Line Items]  
Principal amount 80,000
Debt discount-net of amortization (6,798)
Unaccreted debt issuance expense (269)
Net carrying amount of facility financing obligation 72,933
Net carrying amount included in other liabilities 72,933
Milestone Rights
  
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 (3,150)
Net carrying amount included in other liabilities $ 13,013