XML 15 R5.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Consolidated Statements of Operations (Parenthetical) - Astellas Agreement [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
License and milestone revenue from a related party | $ 0 | $ 22,590 | $ 108,434
Collaboration services and other revenue from a related party | 6,662 | 9,908 | 21,928
Product revenue from a related party | 89,055 | 71,167 | 35,568
Drug product revenue from a related party | $ 18,753 | $ 11,086 | $ 3,186

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 Revenue from multiple-deliverable arrangements that include licensing fees and services revenue and the amount of consideration recognized during the period for milestones. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, non-specified, services during the reporting period. + References No definition available. + Details
Name: | fgen_LicenseFeesAndMilestonesRevenue
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: |