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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Right-of-use assets - cost $ 50,477 $ 49,909
Accumulated amortization (20,871) (10,307)
Finance lease right-of-use assets, net 29,606 39,602
Right-of-use assets - cost 3,934 2,736
Accumulated amortization (1,891) (805)
Operating lease right-of-use assets, net 2,043 1,931
Total lease assets 31,649 41,533
Finance lease liabilities 12,330 12,351
Operating lease liabilities $ 1,188 $ 983
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] fgen:AccruedAndOtherCurrentLiabilitiesMember fgen:AccruedAndOtherCurrentLiabilitiesMember
Finance lease liabilities $ 25,391 $ 37,610
Operating lease liabilities $ 853 $ 942
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherNoncurrentLiabilitiesMember us-gaap:OtherNoncurrentLiabilitiesMember
Total lease liabilities $ 39,762 $ 51,886