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Liability Related to Sale of Future Revenues - Schedule of Activity of Liability Related to Sale of Future Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Liability Related to Sale of Future Royalties [Abstract]
Liability related to sale of future revenues - beginning balance	$ 49,333
Interest expense recognized	2,249	$ 0
Liability related to sale of future revenues - ending balance	51,582
Less: Current portion classified to accrued and other current liabilities	(3,212)
Liability related to sale of future revenues, non-current	$ 48,370

X

- Definition

Liability related to sale of future revenues.

+ References

No definition available.

+ Details

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

X

- Definition

Liability related to sale of future royalties.

+ References

No definition available.

+ Details

Name:	fgen_LiabilityRelatedToSaleOfFutureRoyaltiesAbstract
Namespace Prefix:	fgen_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Liability related to sale of revenue current.

+ References

No definition available.

+ Details

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

X

- Definition

Liability related to sale of revenues noncurrent.

+ References

No definition available.

+ Details

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

X

- Definition

Non cash interest expense related to sale of future revenues.

+ References

No definition available.

+ Details

Name:	fgen_NonCashInterestExpenseRelatedToSaleOfFutureRevenues
Namespace Prefix:	fgen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration