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FibroGen, Inc. 401(k) Plan	12 Months Ended
	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
FibroGen, Inc. 401(k) Plan	11. FibroGen, Inc. 401(k) Plan Substantially all of the Company’s full-time United States of America-based employees are eligible to make contributions to the Company’s 401(k) Plan. Under this plan, participating employees may defer up to 60% of their pretax salary during the year, but not more than statutory limits. The Company may elect to match employee contributions. Matching contributions of $2.5 million, $2.3 million and $2.5 million were made during years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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