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v3.20.2

Collaboration Agreements and Revenues - Roll-forward of Contract Liabilities (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Contract with Customer Liability [Line Items] |
Beginning balance | $ (54,790)
Ending balance | 0
Product [Member] |
Contract with Customer Liability [Line Items] |
Beginning balance | (1,102)
Additions | (10,623)
Deduction | 450
Currency Translation and Other | (117)
Gross Contract Liabilities Balance | (11,392)
Balance Presented Net Against Accounts Receivable | 9,759
Ending balance | $ (1,633)

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

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

X
- Definition Contract with customer liability. + References No definition available. + Details
Name: | fgen_ContractWithCustomerLiabilityLineItems
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
Name: | fgen_ContractWithCustomerLiabilityNetOfAccountsReceivable
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

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |