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Commitments and Contingencies - Presentation of Operating Lease Liability (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
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