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Collaboration Agreements - AstraZeneca Agreements - Additional Information 1 (Detail) - AstraZeneca Agreements [Member] - USD ($) $ in Millions		3 Months Ended			12 Months Ended
	Jul. 30, 2013	Mar. 31, 2018	Sep. 30, 2017	Dec. 31, 2015	Dec. 31, 2015
U.S./RoW [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront, non-contingent, non-refundable and time-based payments	$ 374.0
Potential milestone payments	875.0
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
U.S./RoW [Member] | Clinical and Development Milestone [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential milestone payments	65.0
U.S./RoW [Member] | Regulatory Milestone [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential milestone payments	325.0
U.S./RoW [Member] | Deferred Approval Milestone [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential milestone payments	160.0
U.S./RoW [Member] | Development Milestones [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Receipt of development milestone payment					$ 15.0
China [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential milestone payments	348.5
Proceeds from upfront, non-contingent and non-refundable payments	28.2
Commercial sales and other events milestone	187.5
Milestone payment, revenue recognition			$ 15.0
China [Member] | Clinical and Development Milestone [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential milestone payments	15.0
China [Member] | Regulatory Milestone [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potential milestone payments	$ 146.0

X

- Definition

The amount of additional consideration based on net sales of product as defined under a collaboration agreement.

+ References

No definition available.

+ Details

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X

- Definition

Commercial sales and other events milestone.

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	fgen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Development milestone payment received.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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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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X

- Definition

Represents the total amount of non-contingent, non-refundable, upfront payments included under the collaborative agreement as arrangement consideration.

+ References

No definition available.

+ Details

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X

- Definition

Represents the total amount of non-contingent, non-refundable, upfront payments included under the collaborative agreement as arrangement consideration.

+ References

No definition available.

+ Details

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X

- Definition

Represents the total amount of development costs that will be shared under collaborative agreement.

+ References

No definition available.

+ Details

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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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X

- Definition

The amount of consideration recognized during the period for the milestone or milestones.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 28
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=68058744&loc=SL6892177-166501

+ Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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