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Related Party Transactions
 12 Months Ended
Dec. 31, 2015
Related Party Transactions [Abstract]  
Related Party Transactions

13.

Related Party Transactions

Astellas is an equity investor in the Company and considered a related party. During the years ended December 31, 2015, 2014 and 2013, the Company recorded revenue related to collaboration agreements with Astellas of $21.6 million, $18.0 million, and $25.7 million, respectively. During the years ended December 31, 2015, 2014 and 2013, the Company recorded expense related to collaboration agreements with Astellas of $9.8 million, $11.4 million and $4.0 million, respectively.

As of December 31, 2015 and 2014, accounts receivable from Astellas were $4.5 million and $5.0 million, respectively, and amounts due to Astellas were $2.0 million and $4.3 million, as of the same periods. 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 years ended December 31, 2015 and 2014, the Company made payments to Goodwin Procter LLP of $0.4 million and less than $0.1 million, respectively. As of December 31, 2014, approximately $0.3 million was included in accrued liabilities in the consolidated balance sheet for amounts due to Goodwin Procter LLP. As of December 31, 2015, the balance of accrued liability for Goodwin Procter LLP was immaterial.