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Disclosure - Balance Sheet Components - Schedule of Accrued Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 100690 - Disclosure - Balance Sheet Components - Schedule of Other Long-term Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 100700 - Disclosure - Product Development Obligations - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 100710 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 100720 - Disclosure - Equity and Stock-based Compensation - Subsidiary Stock and Non-Controlling Interests - Additional information (Detail) link:calculationLink link:presentationLink link:definitionLink 100730 - Disclosure - Equity and Stock-based Compensation - Common Stock - Additional information (Detail) link:calculationLink link:presentationLink link:definitionLink 100740 - Disclosure - 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Disclosure - Equity and Stock-based Compensation - Schedule of Assumptions used to Estimate Fair Value of Stock Options Granted and Employee Stock Purchase Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 100810 - Disclosure - Equity and Stock-based Compensation - Stock-Based Compensation - Additional information (Detail) link:calculationLink link:presentationLink link:definitionLink 100820 - Disclosure - Equity and Stock-based Compensation - Warrants - Additional information (Detail) link:calculationLink link:presentationLink link:definitionLink 100830 - Disclosure - Net Loss Per Share - Schedule of Weighted Impacts of Outstanding Anti-dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share (Detail) link:calculationLink link:presentationLink link:definitionLink 100840 - Disclosure - FibroGen, Inc. 401(k) Plan - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 100850 - Disclosure - Income Taxes - Components of Loss Before Income Taxes (Detail) link:calculationLink link:presentationLink link:definitionLink 100860 - Disclosure - Income Taxes - Schedule of Components of Provision For Income Taxes (Detail) link:calculationLink link:presentationLink link:definitionLink 100870 - Disclosure - Income Taxes - Schedule of Reconciliation Between Statutory Federal Income Tax Rate and Effective Tax Rate (Detail) link:calculationLink link:presentationLink link:definitionLink 100880 - Disclosure - Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 100890 - Disclosure - Income Taxes - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 100900 - Disclosure - Income Taxes - Reconciliation of the Beginning and Ending Amounts of Unrecognized Income Tax Benefits (Detail) link:calculationLink link:presentationLink link:definitionLink 100910 - Disclosure - Related Party Transactions - 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Disclosure - Schedule II - Valuation and Qualifying Accounts (Detail) link:calculationLink link:presentationLink link:definitionLink