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Subsequent Event - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Accrued long-term co-promotional expenses		$ 116,230	$ 53,071
AstraZeneca Agreements [Member]
Subsequent Event [Line Items]
Accrued long-term co-promotional expenses		$ 116,200	$ 53,100
Scenario Forecast [Member] | AstraZeneca Agreements [Member]
Subsequent Event [Line Items]
Accrued long-term co-promotional expenses	$ 82,000

X

- Definition

Accrued long-term co-promotional liability non current.

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: