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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Measurements [Abstract]  
Fair value of assets and liabilities on a recurring basis
                 
          Significant  
          Unobservable  
          Inputs  
    December 31, 2012     (Level 3)  

Liabilities:

               

Contingent consideration

  $ 104     $ 104  
Changes in the fair value of the Level 3 liabilities
         

Balance at beginning of 2012

  $ —    

Additions (Note 5)

    135  

Accretion expense

    21  

Change in fair value of contingent consideration

    (52
   

 

 

 

Balance at end of 2012

  $ 104