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Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows from finance leases	$ 23	$ 5,326

X

- Definition

Cash paid for amounts included in the measurement of lease liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Repayments of finance lease liabilities.

+ References

No definition available.

+ Details

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