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Related Party Transactions	12 Months Ended
	Dec. 31, 2018
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, 2018, 2017 and 2016, the Company recorded revenue related to collaboration agreements with Astellas of $100.0 million, $20.1 million, and $31.3 million, respectively. The related party revenue for the year ended December 31, 2018 included $64.8 million product revenue for API to conduct commercial scale manufacturing validation for roxadustat drug product in anticipation of commercial launch in Japan. See Note 3 and below for details. The related party revenue was recast for each of the years ended December 31, 2017 and 2016 as a result of adoption of the new revenue standards. See Note 2 for details. During the years ended December 31, 2018, 2017 and 2016, the Company recorded expense related to collaboration agreements with Astellas of $1.5 million, $1.0 million and $6.4 million, respectively. As of December 31, 2018 and 2017, accounts receivable from Astellas were $47.2 million and $4.0 million, respectively, and amounts due to Astellas were $0.4 million and $0.3 million, respectively. The amounts due are included in accrued liabilities on the consolidated balance sheets. The accounts receivable from Astellas as of December 31, 2018 included $43.8 million related to the delivery of roxadustat API to Astellas during the fourth quarter of 2018. The sale of API was pursuant to the Japan Amendment allowing Astellas to manufacture roxadustat drug product for commercialization in Japan.

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- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-URI http://asc.fasb.org/topic&trid=2122745

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