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Collaboration Agreements and Revenues - Product Revenue - Additional Information 5 (Detail) - Astellas Agreement [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Japan [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract with customer, liability, revenue recognized	$ 43.9	$ 20.9
Product Revenue [Member] | Japan [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract with customer, liability, revenue recognized				$ 64.8
Change in estimated variable consideration			$ 36.3
Roxadustat Drug [Member] | China [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Amount adjusted based on government listed price and estimated channel inventory levels			$ 0.9

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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