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Collaboration Agreements and Revenues - Roll-forward of Related Contract Liabilities (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Contract with Customer Liability [Line Items] |
Balance at December 31, 2019 | $ (54,790)
Balance at December 31, 2020 | (2,147)
Product [Member] |
Contract with Customer Liability [Line Items] |
Balance at December 31, 2019 | (1,102)
Additions | (16,497)
Deduction | 2,184
Currency Translation and Other | (270)
Gross Contract Liabilities Balance | (15,685)
Balance Presented Net Against Accounts Receivable | 548
Balance at December 31, 2020 | (15,137)
Drug Product Revenue [Member] | Astellas Agreement [Member] |
Contract with Customer Liability [Line Items] |
Balance at December 31, 2019 | 0
Additions | (5,984)
Balance at December 31, 2020 | $ (5,984)

X
- Definition Contract with customer liability additions. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with customer liability deduction. + References No definition available. + Details
Name: | fgen_ContractWithCustomerLiabilityDeduction
Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with customer liability gross. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contract with customer, liability, increase (decrease) from current translation and other. + 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 Contract with customer liability. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract with customer liability net of accounts receivable. + References No definition available. + Details
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Namespace Prefix: | fgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: |
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Balance Type: |
Period Type: |

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