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Commitments and Contingencies - Presentation of Operating Lease Liability (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Commitments And Contingencies Disclosure [Abstract] |  |
Present value of future minimum lease payments | $ 3,332 |
Operating lease liability, current portion | 65 | $ 52
Operating lease liability, long-term portion | 3,267 | $ 3,274
Total operating lease liability | 3,332 |
Difference between future minimum lease payments and discounted cash flows | $ 2,347 |

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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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