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Investments
 12 Months Ended
Dec. 31, 2013
Investments  
Investments

5. Investments

        Investments consist of the following:

 
    
   Unrealized    
  
 
   Amortized
Cost		   Market
Value		  
 
   Gain   (Loss)  

December 31, 2013

                          

Short-term investments

                          

Government-sponsored enterprises

   $ 11,510   $ 1   $ —   $ 11,511  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 11,510   $ 1   $ —   $ 11,511  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

December 31, 2012

                          

Short-term investments

                          

Government sponsored enterprises

   $ 29,189   $ 12   $ —   $ 29,201  

Long-term investments

                          

Government-sponsored enterprises

     2,507     1     —     2,508  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 31,696   $ 13   $ —   $ 31,709  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

        The average maturity of our marketable securities available-for-sale as of December 31, 2013 and 2012 was two and four months, respectively.