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Collaboration Agreements - AstraZeneca Agreements - Additional Information 1 (Detail) - AstraZeneca Agreements [Member] - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 29, 2018 | Dec. 17, 2018 | Jul. 30, 2013 | Dec. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2015
U.S./RoW [Member] |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Expected upfront, non-contingent and time-based payments |  |  | $ 374.0 |  |  |  |  |
Development and regulatory approval milestones |  |  | 550.0 |  |  |  |  |
Commercial sales milestone |  |  | 325.0 |  |  |  |  |
Shared development costs |  |  |  |  |  |  |  | $ 233.0
Additional consideration based on net sales description |  |  |  |  |  |  | Low 20% range |
U.S./RoW [Member] | FibroGen, Inc. [Member] |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Shared development costs |  |  |  |  |  |  |  | $ 116.5
China [Member] |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Development and regulatory approval milestones |  |  | 161.0 |  |  |  |  |
Commercial sales milestone |  |  | 167.5 |  |  |  |  |
Proceeds from upfront payments |  |  | 28.2 |  |  |  |  |
Contingent payment |  |  | $ 20.0 |  |  |  |  |
Estimated joint development service period |  |  |  |  |  | 2018 |  |
Estimated joint development extended service period |  |  |  |  |  | 2020 | 2024 |
Milestone payment, revenue recognition | $ 6.0 | $ 6.0 |  | $ 9.9 | $ 15.0 |  | $ 12.0 |

X
- Definition The amount of additional consideration based on net sales of product as defined under a collaboration agreement. + References No definition available. + Details
Name: | fgen_AdditionalConsiderationBasedOnNetSales
Namespace Prefix: | fgen_
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Balance Type: | na
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X
- Definition Represents the amount of milestone payments related to commercial sales under the collaborative agreement. + References No definition available. + Details
Name: | fgen_CommercialSalesMilestone
Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of contingent payments provided for under the collaboration agreement. + References No definition available. + Details
Name: | fgen_ContingentPayments
Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contract with customer liability, milestone method revenue recognized. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the potential amount of milestone payments related to development and regulatory approval under the collaborative agreement. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated joint development extended service period. + References No definition available. + Details
Name: | fgen_EstimatedJointDevelopmentExtendedServicePeriod
Namespace Prefix: | fgen_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Estimated joint development service period. + References No definition available. + Details
Name: | fgen_EstimatedJointDevelopmentServicePeriod
Namespace Prefix: | fgen_
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the total amount of expected non-contingent upfront payments included under the collaborative agreement as arrangement consideration. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of upfront payments included under the collaborative agreement as arrangement consideration. + References No definition available. + Details
Name: | fgen_ProceedsFromUpfrontPayments
Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the total amount of development costs that will be shared under collaborative agreement. + References No definition available. + Details
Name: | fgen_SharedDevelopmentCosts
Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
Name: | dei_LegalEntityAxis=fgen_FibroGenIncMember
Namespace Prefix: |
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- Details
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