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Fair Value Measurements
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair Value Measurements
11. Fair Value Measurements
The fair value hierarchy prioritizes observable and unobservable inputs used to measure fair value into three broad levels:
     Level 1 — quoted prices in active markets for identical securities;
     Level 2 — other significant observable inputs, including quoted prices for similar securities, interest rates and credit risk,
     Level 3 — significant unobservable inputs, including our own assumptions in determining fair value
The following table summarizes the financial assets that we measured at fair value at September 30, 2011 and December 31, 2010. We did not have any non-financial assets or liabilities that were measured or disclosed at fair value for the nine months ended September 30, 2011. No transfers occurred between Level 1 and Level 2 assets for the nine months ended September 30, 2011.
                                 
    September 30, 2011     Input     December 31, 2010     Input  
    Fair Value     Level     Fair Value     Level  
Cash and money market funds — current assets
  $ 86,129     Level 1   $ 98,514     Level 1
Indemnity fund-restricted money market funds
    115,424     Level 1     115,568     Level 1
Short-term investments
    58,814     Level 2         Level 2
 
                               
 
  $ 259,967             $ 214,082          
 
                           
It is not practicable to estimate the fair value of the Company’s convertible debt. However, it is likely that the fair value of the debt would be materially less than the carrying value of the debt because the conversion price of $2.50 is higher than the Company’s stock price of $0.06 as of September 30, 2011.