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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value Measurements  
Schedule of fair value of assets and liabilities measured on a recurring basis

The fair value of these certain financial assets was determined using the following inputs as of December 31, 2012 and December 31, 2011 (in thousands):

 
   Fair Value
as of
December 31, 2012		   Level 1   Level 2   Level 3  

Financial Assets:

                          

Money Market Funds(1)

   $ 47,086   $ 47,086   $ —   $ —  

US government debt securities(3)

     59,815     55,817     3,998     —  

Corporate debt securities(3)

     110,508     —     110,508     —  

Foreign government debt securities(2)

     2,421     —     2,421     —  

Financial Liabilities:

                          

Debt(5)

   $ 95,000   $ —   $ 95,000   $ —  

 
   Fair Value
as of
December 31, 2011		   Level 1   Level 2   Level 3  

Financial Assets:

                          

Money Market Funds(1)

   $ 40,197   $ 40,197   $ —   $ —  

US government debt securities(2)

     11,323     11,323     —     —  

Corporate debt securities(3)

     52,605     —     52,605     —  

Foreign government debt securities(4)

     8,432     —     8,432     —  

Financial Liabilities:

                          

Debt(5)

   $ 50,000   $ —   $ 50,000   $ —  
(1)
Included in cash and cash equivalents on the Company's consoldiated balance sheet.

(2)
Included in short-term marketable securities on the Company's consolidated balance sheet.

(3)
Included in short-term and long-term marketable securities on the Company's consolidated balance sheet.

(4)
Included in cash and cash equivalents, and short-term marketable securities on the Company's consolidated balance sheet.

(5)
Included in current portion of long-term debt and long-term debt on the Company's consolidated balance sheet.