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Investments and Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2013
Investments and Fair Value Measurements [Abstract]  
Schedule of investments
                 
    March 31,
2013		     December 31,
2012		  
    Held-to-
Maturity		     Held-to-
Maturity		  

Federal agency debt instruments

   $ 10,668     $ 11,036  
   

 

 

    

 

 

  
Schedule of unrealized gains, losses, and fair value of investments
                 
    March 31,
2013		     December 31,
2012		  
    Held-to-
Maturity		     Held-to-
Maturity		  

Cost/amortized cost

   $ 10,668     $ 11,036  

Gross unrealized gains

     48       61  

Gross unrealized losses

     (163 )      (157 ) 
   

 

 

    

 

 

  

Fair value

   $ 10,553     $ 10,940  
   

 

 

    

 

 

  
Schedule of maturity profile of investments
                 
    March 31,
2013		     December 31,
2012		  
    Held-to-
Maturity		     Held-to-
Maturity		  

Due within one year

   $ —       $ —    

Due one year through five years

     —         —    

Due five years through ten years

     714       727  

Due over ten years

     9,954       10,309  
   

 

 

    

 

 

  

Total

   $ 10,668     $ 11,036