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Convertible Senior Secured Notes (Tables)
 12 Months Ended
Dec. 31, 2013
Convertible Senior Secured Notes  
Summary of issuance of Notes reflected in balance sheet

The table below summarizes how the issuance of the Notes is reflected in the balance sheet at December 31, 2013, in thousands:

 
   December 31, 2013  

Gross proceeds

   $ 90,000  

Initial value of interest make-whole derivative reported as debt discount

     (9,270 )

Conversion option reported as debt discount and APIC

     (22,336 )

Conversion of debt to equity—principal

     (40,492 )

Conversion of debt to equity—debt discount

     13,833  

Amortization of debt discount

     2,658  
       
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Carrying value

   $ 34,393  
       
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