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Major Customers, Partnerships and Strategic Alliances (Tables)
12 Months Ended
Dec. 31, 2012
Shire AG [Member]
 
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues recognized under the agreement

Revenues recognized under the agreement with Shire for the twelve months ended December 31, 2012, were as follows (in thousands):

 

         
    Year ended
December 31, 2012
 

Revenues related to Shire Collaboration:

       

Amortization of upfront fee

  $ 1,986  

Research services

    9,026  
   

 

 

 

Total

  $ 11,012  
   

 

 

 
Sigma-Aldrich Corporation [Member]
 
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Revenues recognized under the agreement
                         
    Year ended
December 31,
 
    2012     2011     2010  

Revenue related to Sigma Collaboration:

                       

Royalty revenues

  $ 1,288     $ 938     $ 734  

License fee and milestone revenues

    1,000       671       11,574  
   

 

 

   

 

 

   

 

 

 

Total

    2,288       1,609       12,308