Related Party Transactions

12 Months Ended

Dec. 31, 2016

13.	Related Party Transactions

Astellas is an equity investor in the Company and considered a related party. During the years ended December 31, 2016, 2015 and 2014, the Company recorded revenue related to collaboration agreements with Astellas of $25.8 million, $21.6 million, and $18.0 million, respectively. During the years ended December 31, 2016, 2015 and 2014, the Company recorded expense related to collaboration agreements with Astellas of $6.4 million, $9.8 million and $11.4 million, respectively.

As of December 31, 2016 and 2015, accounts receivable from Astellas were $4.1 million and $4.5 million, respectively, and amounts due to Astellas were $1.6 million and $2.0 million, respectively. The amounts due are included in accrued liabilities on the consolidated balance sheets.

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 year ended December 31, 2016, the Company’s payment to Goodwin Procter LLP was immaterial. During the year ended December 31, 2015, the Company made payments to Goodwin Procter LLP of $0.4 million. As of December 31, 2016, there was no accrued liability due to Goodwin Procter LLP in the consolidated balance sheet. As of December 31, 2015, the balance of accrued liability for Goodwin Procter LLP was immaterial.