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Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) - Astellas Agreement [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Collaboration services and other revenue from a related party	$ 3,611	$ 4,737
Product revenue from a related party	10,406	0
Drug product revenue from a related party	$ 4,030	$ 0

X

- Definition

Revenue recognized from co-development services, manufacturing of clinical supplies, committee services and information services and other revenue.

+ References

No definition available.

+ Details

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

X

- Definition

Drug product revenue from related party.

+ References

No definition available.

+ Details

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

X

- Definition

Product revenue from a related party.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=fgen_AstellasCollaborationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: