XML 105 R76.htm IDEA: XBRL DOCUMENT
v3.20.4

Commitments and Contingencies - Summary of Unconditional Purchase Obligations (Detail) $ in Thousands | Dec. 31, 2020 USD ($)
--- | ---
Recorded Unconditional Purchase Obligation [Line Items] |
Purchase obligations due 2021 | $ 42,012
Purchase obligations due 2022 | 44,014
Total purchase obligations | 86,026
Manufacture and Supply of Roxadustat [Member] |
Recorded Unconditional Purchase Obligation [Line Items] |
Purchase obligations due 2021 | 14,114
Purchase obligations due 2022 | 10,951
Total purchase obligations | 25,065
Manufacture and Supply of Pamrevlumab [Member] |
Recorded Unconditional Purchase Obligation [Line Items] |
Purchase obligations due 2021 | 24,480
Purchase obligations due 2022 | 33,063
Total purchase obligations | 57,543
Other Purchases [Member] |
Recorded Unconditional Purchase Obligation [Line Items] |
Purchase obligations due 2021 | 3,418
Purchase obligations due 2022 | 0
Total purchase obligations | $ 3,418

X
- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fgen_ManufactureAndSupplyOfRoxadustatMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fgen_ManufactureAndSupplyOfPamrevlumabMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fgen_OtherPurchasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |