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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Measurements  
Schedule of financial assets and liabilities recorded at fair value

The following tables provide the Company's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2013 and December 31, 2012 (in thousands).

Description
  Balance as of
December 31,
2013		   Level 1   Level 2   Level 3  

Assets:

                          

Cash and money market funds

   $ 18,078   $ 18,078   $ —   $ —  

Corporate debt securities (including commercial paper)

     26,349     —     26,349     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets

   $ 44,427   $ 18,078   $ 26,349   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Liabilities:

                          

Technology access fee due to Intrexon

   $ 2,186   $ —   $ —   $ 2,186  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total liabilities

   $ 2,186   $ —   $ —   $ 2,186  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
 

Description
  Balance as of
December 31,
2012		   Level 1   Level 2  

Assets:

                    

Cash and money market funds

   $ 14,776   $ 14,776     —  

Corporate debt securities (including commercial paper)

     16,615     —     16,615  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets

   $ 31,391   $ 14,776   $ 16,615  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of changes in the fair value of the level 3 technology access fee due to Intrexon
  Technology access fee  
 
   (in thousands)
  

Balance at December 31, 2012

   $ —  

Collaboration with Intrexon

     2,174  

Fair value adjustment(1)

     12  
       
​ ​ ​ ​ ​

Balance at December 31, 2013

   $ 2,186  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​
       
(1)
Fair value adjustments consist of interest recorded.