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Fair Value Measurements
6 Months Ended
Jun. 30, 2011
Fair Value Measurements [Abstract]  
Fair Value Measurements
4. Fair Value Measurements
     Effective January 1, 2008, the Company adopted SFAS 157, Fair Value Measurements, (now referred to as ASC 820) which clarifies the definition of fair value, prescribes methods for measuring fair value, establishes a fair value hierarchy based on the inputs used to measure fair value and expands disclosures about the use of fair value measurements. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 values are based on quoted prices in active markets. Level 2 values are based on significant other observable inputs. Level 3 values are based on significant unobservable inputs. The following table presents the fair value level for the assets that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy. The Company does not have any liabilities that are measured at fair value.
                                 
    Fair Value Measurements  
            (In thousands)              
            Quoted Prices     Significant        
            in Active     Other     Significant  
            Markets for     Observable     Unobservable  
    Balance     Identical Assets     Inputs     Inputs  
Description   June 30, 2011     (Level 1)     (Level 2)     (Level 3)  
Cash and cash equivalents
  $ 8,481     $ 8,481     $     $  
 
                       
Short-term investments:
                               
Commercial paper
  $ 399     $     $ 399     $  
U.S. treasury and agencies
    500             500        
 
                       
Total
  $ 899     $     $ 899     $  
 
                       
     The Company’s cash and cash equivalents at June 30, 2011 consist of cash and money market funds. Money market funds are valued using quoted market prices. The Company’s short-term investments at June 30, 2011 consisted of commercial paper and U.S agency notes. The Company uses an independent third party pricing service to value its commercial paper and other Level 2 investments. The pricing service uses observable inputs such as new issue money market rates, adjustment spreads, corporate actions and other factors and applies a series of matrices pricing model. The Company performs a review of prices reported by the pricing service to determine if they are reasonable estimates of fair value. In addition, the Company performs a review of its securities to determine the proper classification in accordance with the fair value hierarchy.