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Collaboration Agreements - AstraZeneca Agreements - Additional Information 1 (Detail) - AstraZeneca Agreements [Member] - USD ($) $ in Millions		3 Months Ended		6 Months Ended	12 Months Ended
	Jul. 30, 2013	Sep. 30, 2016	Dec. 31, 2015	Jun. 30, 2017	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
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]
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

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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- Definition

Represents the amount of milestone payments related to commercial sales under the collaborative agreement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Represents the amount of contingent payments provided for under the collaboration agreement.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- 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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Balance Type:	debit
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X

- Definition

Development milestone payment received.

+ References

No definition available.

+ Details

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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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Balance Type:	na
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X

- Definition

Estimated joint development service period.

+ References

No definition available.

+ Details

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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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X

- Definition

Represents the amount of 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

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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Data Type:	xbrli:monetaryItemType
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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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- Details

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- Details

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X

- Details

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X

- Details

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