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Subsequent Event - Additional Information (Details) - NovaQuest Capital Management [Member] - Subsequent Event [Member] $ in Millions | Oct. 01, 2022 USD ($)
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Subsequent Event [Line Items] |
Cash upfront payment receivable | $ 50.0
Repayment description | FibroGen agreed to pay NovaQuest annually, up to certain caps (see below), 22.5% of all revenue recognized by the Company in respect of net sales of roxadustat in Europe and Japan and the other Astellas territories, and certain other tiered percentages of revenue (in each case paid annually), pursuant to FibroGen’s license and collaboration agreements with Astellas.
Aggregate royalties received 2028 | $ 100.0
Aggregate royalties received 2029 | 112.5
Aggregate royalties received 2030 | $ 125.0

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- Definition Aggregate royalties received year one. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate royalties received year three. + References No definition available. + Details
Name: | fgen_AggregateRoyaltiesReceivedYearThree
Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate royalties received year two. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash upfront payment receivable. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Repayment description. + References No definition available. + Details
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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Period Type: |