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Components of Facility Financing Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Securities Financing Transaction [Line Items]        
Accretion of debt discount and debt issuance expense $ (227) $ (212) $ (450) $ (421)
Net carrying value of facility financing obligation 37,744   37,744  
Commitment asset fair value balance at December 31,2013 5,157   5,157  
Commitment asset value included in other assets 6,910   6,910  
Tranche B notes
       
Securities Financing Transaction [Line Items]        
Tranche B commitment asset fair value 2,921   2,921  
Less commitment asset portion associated with the receipt of Tranche B notes (1,168)   (1,168)  
Facility financing obligation
       
Securities Financing Transaction [Line Items]        
Carrying value 102,300   102,300  
Principal converted to equity (93,500)   (93,500)  
Accretion of debt discount and debt issuance expense     7,191  
Facility financing obligation | Senior convertible notes due December 31, 2019
       
Securities Financing Transaction [Line Items]        
Debt discount     2,921  
Facility financing obligation | Tranche B notes
       
Securities Financing Transaction [Line Items]        
Debt discount     (1,168)  
Carrying value $ 20,000   $ 20,000