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Components of Facility Agreement (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Securities Financing Transaction [Line Items]        
Accretion of debt discount and debt issuance expense $ 231,000 $ 216,000 $ 681,000 $ 637,000
Net carrying value of facility financing obligation 72,625,000   72,625,000  
Commitment asset balance at December 31,2013 5,157,000   5,157,000  
Commitment asset value included in other assets 1,753,000   1,753,000  
Tranche B notes
       
Securities Financing Transaction [Line Items]        
Tranche B commitment asset fair value 2,921,000   2,921,000  
Tranche 4 and Tranche B
       
Securities Financing Transaction [Line Items]        
Less commitment asset portion associated with the receipt of Tranche 4 and Tranche B notes (6,325,000)   (6,325,000)  
Facility financing obligation
       
Securities Financing Transaction [Line Items]        
Carrying value 102,300,000   102,300,000  
Principal converted to equity (93,500,000)   (93,500,000)  
Accretion of debt discount and debt issuance expense     7,507,000  
Facility financing obligation | Senior convertible notes due December 31, 2019
       
Securities Financing Transaction [Line Items]        
Debt discount     2,921,000  
Facility financing obligation | Tranche B notes
       
Securities Financing Transaction [Line Items]        
Carrying value 20,000,000   20,000,000  
Debt discount     (1,168,000)  
Facility financing obligation | Fourth tranche
       
Securities Financing Transaction [Line Items]        
Carrying value 40,000,000   40,000,000  
Debt discount     $ (5,435,000)