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Collaboration Agreements - Astellas Agreements - Additional Information (Detail) - Astellas Agreement [Member] - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 35 Months Ended | 45 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2006 | Jun. 30, 2005 | Mar. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2009 | Feb. 28, 2009
Japan [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Upfront, non-contingent and time-based payments received |  |  |  |  |  | $ 40.1
Potential milestone payments |  | $ 132.5 |  |  |  |
Commercial sales milestone |  | 15.0 |  |  |  |
Japan [Member] | Clinical and Development Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments |  | 22.5 |  |  |  |
Japan [Member] | Regulatory Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments |  | $ 95.0 |  |  |  |
Europe [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Upfront, non-contingent and time-based payments received |  |  |  |  | $ 320.0 |
Potential milestone payments | $ 425.0 |  |  |  |  |
Percentage of joint development costs committed to fund | 50.00% |  |  |  |  |
Additional consideration based on net sales description |  |  | Low 20% range |  |  |
Estimated joint development extended service period |  |  |  | 2023 |  |
Europe [Member] | Clinical and Development Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | $ 90.0 |  |  |  |  |
Europe [Member] | Regulatory Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | $ 335.0 |  |  |  |  |

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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Represents the percentage of costs that will be funded by the other party under a collaborative agreement for development costs. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Represents the amount of fixed and determinable non-contingent upfront payments included under the collaborative agreement as arrangement consideration. + References No definition available. + Details
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Namespace Prefix: | fgen_
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Balance Type: | debit
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- 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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_JP
Namespace Prefix: |
Data Type: | na
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |