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Related Party Transactions
 9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]  
Related Party Transactions

7.

Related Party Transactions

Astellas is an equity investor of ours and, therefore, considered a related party. We recorded revenue related to collaboration agreements with Astellas of $6.0 million and $4.4 million during the quarter ended September 30, 2015 and 2014 and $16.9 million and $12.5 million during the nine months ended September 30, 2015 and 2014. We recorded expense related to collaboration agreements with Astellas of $3.4 million and $2.6 million during the quarter ended September 30, 2015 and 2014 and $7.8 million and $7.1 million during the nine months ended September 30, 2015 and 2014.

As of September 30, 2015 and December 31, 2014, accounts receivable from Astellas were $5.5 million and $5.0 million and amounts due to Astellas were $3.4 million and $4.3 million.

Julian N. Stern, a director of ours since November 1996, is of counsel to the law firm of Goodwin Procter LLP, which he joined in 2008. He has received, and continues to receive, no compensation from Goodwin Procter LLP since joining it as of counsel. We retain Goodwin Procter LLP as legal counsel for various matters, primarily consisting of intellectual property.  During the quarters and nine months ended September 30, 2015 and 2014, the payments made by us to Goodwin Procter LLP were not material. As of September 30, 2015 and December 31, 2014, amounts due to Goodwin Proctor LLP were not material.