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Related Party Transactions
 3 Months Ended
Mar. 31, 2016
Related Party Transactions [Abstract]  
Related Party Transactions

7.

Related Party Transactions

Astellas is an equity investor in the Company and considered a related party. During the quarter ended March 31, 2016 and 2015, the Company recorded revenue related to collaboration agreements with Astellas of $3.7 million and $5.3 million, respectively. During the quarter ended March 31, 2016 and 2015, the Company recorded expense related to collaboration agreements with Astellas of $1.6 million and $3.0 million, respectively.

As of March 31, 2016 and December 31, 2015, accounts receivable from Astellas were $3.7 million and $4.5 million, respectively, and amounts due to Astellas were $1.6 million and $2.0 million, respectively.

Julian N. Stern, a director of the Company 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. The Company retains Goodwin Procter LLP as legal counsel for various matters, primarily consisting of intellectual property matters. During the three months ended March 31, 2016 and 2015, the Company made payments to Goodwin Procter LLP of less than $0.1 million, respectively. As of March 31, 2016 and December 31, 2015, the balance of accrued liability for Goodwin Proctor LLP was immaterial.