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Disclosure - Balance Sheet Components - Schedule of Cash and Cash Equivalents (Detail) link:calculationLink link:presentationLink link:definitionLink 100470 - Disclosure - Balance Sheet Components - Schedule of Property and Equipment (Detail) link:calculationLink link:presentationLink link:definitionLink 100480 - Disclosure - Balance Sheet Components - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 100490 - Disclosure - Balance Sheet Components - Summary of Amortized Cost, Gross Unrealized Holding Gains or Losses, and Fair Value of Available-for-Sale Investments (Detail) link:calculationLink link:presentationLink link:definitionLink 100500 - Disclosure - Balance Sheet Components - Summary of Contractual Maturities Available-for-Sale Investments at Fair Value(Detail) link:calculationLink link:presentationLink link:definitionLink 100510 - Disclosure - Balance Sheet Components - Schedule of Accrued Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 100520 - 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Disclosure - FibroGen, Inc. 401(k) Plan - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 100700 - Disclosure - Income Taxes - Components of Loss Before Income Taxes (Detail) link:calculationLink link:presentationLink link:definitionLink 100710 - Disclosure - Income Taxes - Schedule of Components of Provision For (Benefit From) Income Taxes (Detail) link:calculationLink link:presentationLink link:definitionLink 100720 - Disclosure - Income Taxes - Schedule of Reconciliation Between Statutory Federal Income Tax Rate and Effective Tax Rate (Detail) link:calculationLink link:presentationLink link:definitionLink 100730 - Disclosure - Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 100740 - Disclosure - Income Taxes - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 100750 - Disclosure - Income Taxes - Reconciliation of the Beginning and Ending Amounts of Unrecognized Income Tax Benefits (Detail) link:calculationLink link:presentationLink link:definitionLink 100760 - 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