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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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