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Fair value of financial instruments (Tables)
9 Months Ended
Sep. 30, 2012
Financial Liability Measured at Fair Value on Recurring Basis

The following table summarizes fair value measurements by level as of September 30, 2012, for the Company’s level 3 financial liability measured at fair value on a recurring basis:

 

     Level 1      Level 2      Level 3  

Private placement warrants liability

     —           —         $ 2,562   
        

 

 

 

The following table summarizes fair value measurements by level as of December 31, 2011, for the Company’s level 3 financial liability measured at fair value on a recurring basis:

 

     Level 1      Level 2      Level 3  

Private placement warrants liability

     —           —         $ 3,270   
        

 

 

 
Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument

The following table summarizes the change in the estimated fair value of the Company’s Level 3 financial instrument for the period ended September 30, 2012:

 

Balance at December 31, 2011

   $  3,270   

Change in the value of private placement warrants liability

     (656 )

Change due to exercise of private placement warrants

     (52 )
  

 

 

 

Balance at September 30, 2012

   $ 2,562