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Liability Related to Sale of Future Revenues - Schedule of Activities of Liability Related to Sale of Future Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2024 | Jun. 30, 2024
Liability Related to Sale of Future Royalties [Abstract] |  |
Liability related to sale of future revenues - beginning balance | $ 57,067 | $ 57,067
Interest paid | $ (5,700) | (5,653)
Interest expense recognized |  | 3,749
Liability related to sale of future revenues - ending balance |  | 55,163
Less: Current portion classified to accrued and other current liabilities |  | (631)
Liability related to sale of future revenues, non-current |  | $ 54,532

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- Definition Interest paid related to sale of future revenues. + References No definition available. + Details
Name: | fgen_InterestPaidRelatedToSaleOfFutureRevenues
Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- 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

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- 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

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- 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

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- 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